WinHttp编程初步心得
2016-08-12 15:23
411 查看
代码都在下面了，目前这个版本实现的功能还非常的少，能实现的有：
1. GET方法。给定一个URL（可以带中文），返回http的响应数据，包括文本和二进制数据
2. 支持代理服务器，需要用户预先设定好proxy server ip, port, username, password.
不支持的有：
1. POST
2. 查询http响应的header。
3. 将返回的文本数据重新编码，变成UTF-16。这需要首先从header取出http server响应的数据是什么编码的，然后就可以使用windows的MultiByteToWideChar来进行转换。
这里总结几点开发过程中的注意点：
1. MSDN上的资料不是非常的全，所以有些参考了google得来的内容。
2. WinHttpOpen的时候，如果用AUTO PROXY，也就是让winhttp从注册表读取proxy设置的话（这个注册表的设置是proxycfg.exe生成的，和IE中的那个proxy设置是两码事）。
3. proxy的用户名和密码需要用WinHttpSetOption来进行设置, timeout设定用WinHttpSetTimeouts
4. 使用WinHttpCrackUrl可以将一个给定的url（必须以http://, https://打头）分解，设置到URL_COMPONENTS这个structure中。在这里其实就可以做url encoding（也就是将url不支持的字符转换成%xxx这样的东西），但是这样做的话需要手动给URL_COMPONENETS中的member分 配内存，比较麻烦，所以没做。
5. 使用WinHttpCreateUrl可以根据URL_COMPONENETS重新生成一个string的URL，但是这里没用到。
6. 使用WinHttpConnect的时候，一定要注意要给出hostname，不是url，所以要手动分解，只取出http server的那个部分，比如http://www.google.com/sfsdfdsf?id=xxx& user=xxxx，hostname就是www.google.com
7. 然后使用WinHttpOpenRequest的时候，就可以给出去掉了http://之后的后面所有内容了，也就是www.google.com /sfsdfdsf?id=xxx&user=xxxx这样的东西。注意最后的flag设 置：WINHTTP_FLAG_ESCAPE_PERCENT | WINHTTP_FLAG_REFRESH，这两个很有用，WINHTTP_FLAG_ESCAPE_PERCENT就是将url中不合法的内容转 成%xxx，WINHTTP_FLAG_REFRESH就是跳过proxy的cache，每次都请求全新的数据。还有需要注意的
是，WinHttpOpenRequest中，要求给出我们能接受的mimetype，这里可以参考代码，如果要文本，就给text/*，如果要二进制数 据，就可以像这里给出application/*, image/*, audio/*......
8. 最后WinHttpSendRequest的时候，也可以设定additional header和optional数据。这里的optional数据一般是用于POST的，也就是将需要post到server的数据填充在这个地方。 WinHttpSendRequest将header都发送出去之后，紧接着就会发送这个optional数据。
9. WinHttpQueryDataAvailable可以check是否还有数据需要接收。WinHttpReadData用来读取数据，注意读出来的数 据就是字节流，像前面所说，如果是文本，那么要根据response header，首先知道是什么编码和字符集，然后再用MultiByteToWideChar来转换。也要注意WinHttpReadData的最后一个 参数，给出了实际读取到的字节数，也可以根据这个信息来判断是否已经接收完了。此外特别需要注意的是，如果用的是一个固定的buffer循环接收，就像这 里一样，那么不要忘记接收完成的时候，要在尾部加上\0，分配buffer的时候也要留出\0的位置。
/*
* Schedule Download Http utilities, based on winhttp
* Written by Eric Zhang <nicolas.m.zhang@gmail.com>
*/
#include "..\include\http.h"
#include "..\include\logger.h"
#include "..\include\utils.h"
#include "..\include\defs.h"
#include "..\include\macros.h"
#include <strsafe.h>
// http server's hostname length
#define HTTP_HOST_NAME_MAX 255
#define HTTP_TEXT_MIMETYPE 1
#define HTTP_BIN_MIMETYPE 2
// mimetypes for WinHttpOpenRequest
LPCWSTR text_mimetype[] = { L"text/*", L"\0" };
LPCWSTR bin_mimetype[] = { L"application/*", L"audio/*", L"image/*", L"video/*", L"\0" };
/*
* This function used internally. It checks the proxy settings and apply
* to the WinHttp. Return winhttp session handle if succeeded, otherwise
* return NULL.
*/
static HINTERNET open_winhttp()
{
HINTERNET session = NULL;
TCHAR proxy_enabled[REGISTRY_VALUE_SIZE];
TCHAR proxy_server[REGISTRY_VALUE_SIZE];
TCHAR proxy_port[REGISTRY_VALUE_SIZE];
TCHAR proxy_username[REGISTRY_VALUE_SIZE];
TCHAR proxy_password[REGISTRY_VALUE_SIZE];
DWORD errcode;
size_t proxy_username_len = 0;
size_t proxy_password_len = 0;
// Check whether the proxy has enabled
SecureZeroMemory(proxy_enabled, sizeof(proxy_enabled));
utils_get_registry_value(SD_REGISTRY_KEY, HTTP_PROXY_ENABLED_ENTRY, proxy_enabled, sizeof(proxy_enabled));
if (utils_is_string_empty(proxy_enabled) || _tcscmp(proxy_enabled, TEXT("Y")) != 0) {
// proxy isn't enabled, direct connect
session = WinHttpOpen(HTTP_AGENT_NAME, WINHTTP_ACCESS_TYPE_NO_PROXY, WINHTTP_NO_PROXY_NAME, WINHTTP_NO_PROXY_BYPASS, 0);
if (session == NULL) {
GET_ERROR_CODE(errcode);
M_GTIF_WITH_LOG(FALSE, failed, LOG_LEVEL_ERROR, __SDFILE__, __LINE__, HTTP_NO_PROXY_OPEN_FAILED, utils_format_error_string(errcode));
}
} else {
// proxy enabled, read server/port/user/pass next
SecureZeroMemory(proxy_server, sizeof(proxy_server));
SecureZeroMemory(proxy_port, sizeof(proxy_port));
SecureZeroMemory(proxy_username, sizeof(proxy_username));
SecureZeroMemory(proxy_password, sizeof(proxy_password));
utils_get_registry_value(SD_REGISTRY_KEY, HTTP_PROXY_SERVER_ENTRY, proxy_server, sizeof(proxy_server));
utils_get_registry_value(SD_REGISTRY_KEY, HTTP_PROXY_PORT_ENTRY, proxy_port, sizeof(proxy_port));
utils_get_registry_value(SD_REGISTRY_KEY, HTTP_PROXY_USER_ENTRY, proxy_username, sizeof(proxy_username));
utils_get_registry_value(SD_REGISTRY_KEY, HTTP_PROXY_PASS_ENTRY, proxy_password, sizeof(proxy_password));
M_GTIF_WITH_LOG(!utils_is_string_empty(proxy_server), failed, LOG_LEVEL_ERROR, __SDFILE__, __LINE__, HTTP_PROXY_SERVER_ABSENT);
M_GTIF_WITH_LOG(!utils_is_string_empty(proxy_port), failed, LOG_LEVEL_ERROR, __SDFILE__, __LINE__, HTTP_PROXY_PORT_ABSENT);
M_GTIF_WITH_LOG(utils_is_string_int(proxy_port), failed, LOG_LEVEL_ERROR, __SDFILE__, __LINE__, HTTP_PROXY_PORT_ILLEGAL);
// add port into server string
M_GTIF_WITH_LOG(SUCCEEDED(StringCchPrintf(proxy_server, _countof(proxy_server), TEXT("%s:%s"), proxy_server, proxy_port)), failed,
LOG_LEVEL_ERROR, __SDFILE__, __LINE__, HTTP_STRING_OPERATION_FAILED);
// open
session = WinHttpOpen(HTTP_AGENT_NAME, WINHTTP_ACCESS_TYPE_NAMED_PROXY, proxy_server, WINHTTP_NO_PROXY_BYPASS, 0);
if (session == NULL) {
GET_ERROR_CODE(errcode);
M_GTIF_WITH_LOG(FALSE, failed, LOG_LEVEL_ERROR, __SDFILE__, __LINE__, HTTP_OPEN_WITH_PROXY_FAILED, utils_format_error_string(errcode));
}
// set proxy username & password
if (!utils_is_string_empty(proxy_username) && !utils_is_string_empty(proxy_password)) {
M_GTIF_WITH_LOG(SUCCEEDED(StringCchLength(proxy_username, _countof(proxy_username), &proxy_username_len)), failed,
LOG_LEVEL_ERROR, __SDFILE__, __LINE__, HTTP_STRING_OPERATION_FAILED);
M_GTIF_WITH_LOG(SUCCEEDED(StringCchLength(proxy_password, _countof(proxy_password), &proxy_password_len)), failed,
LOG_LEVEL_ERROR, __SDFILE__, __LINE__, HTTP_STRING_OPERATION_FAILED);
if (!WinHttpSetOption(session, WINHTTP_OPTION_PROXY_USERNAME, proxy_username, proxy_username_len)) {
GET_ERROR_CODE(errcode);
M_GTIF_WITH_LOG(FALSE, failed, LOG_LEVEL_ERROR, __SDFILE__, __LINE__, HTTP_SET_PROXY_USER_FAILED, utils_format_error_string(errcode));
}
if (!WinHttpSetOption(session, WINHTTP_OPTION_PROXY_PASSWORD, proxy_password, proxy_password_len)) {
GET_ERROR_CODE(errcode);
M_GTIF_WITH_LOG(FALSE, failed, LOG_LEVEL_ERROR, __SDFILE__, __LINE__, HTTP_SET_PROXY_PASS_FAILED, utils_format_error_string(errcode));
}
}
}
// set timeouts
if (!WinHttpSetTimeouts(session, HTTP_RESOLVE_TO, HTTP_CONNECT_TO, HTTP_SEND_TO, HTTP_RECV_TO)) {
GET_ERROR_CODE(errcode);
M_GTIF_WITH_LOG(FALSE, failed, LOG_LEVEL_ERROR, __SDFILE__, __LINE__, HTTP_SET_TIMEOUTS_FAILED, utils_format_error_string(errcode));
}
return session;
failed:
if (session != NULL) WinHttpCloseHandle(session);
return NULL;
}
static BOOL http_get(PCTSTR url, HINTERNET *sess, HINTERNET *conn, HINTERNET *req, DWORD mimetype)
{
HINTERNET session = NULL, connect = NULL, request = NULL;
BOOL result = FALSE;
DWORD errcode;
URL_COMPONENTS url_comp;
size_t url_len_input;
TCHAR http_host_name[HTTP_HOST_NAME_MAX];
int hostname_index;
M_RETURN_VAL_IF_FAIL(url != NULL, FALSE);
M_RETURN_VAL_IF_FAIL(sess != NULL, FALSE);
M_RETURN_VAL_IF_FAIL(conn != NULL, FALSE);
M_RETURN_VAL_IF_FAIL(req != NULL, FALSE);
M_RETURN_VAL_IF_FAIL(logger_is_enabled(), FALSE);
session = open_winhttp();
M_RETURN_VAL_IF_FAIL(session != NULL, FALSE); // log has been done in open_winhttp function
// crack url input
// Initialize the URL_COMPONENTS structure.
SecureZeroMemory(&url_comp, sizeof(url_comp));
url_comp.dwStructSize = sizeof(url_comp);
// Set required component lengths to non-zero
// so that they are cracked.
url_comp.dwSchemeLength = -1;
url_comp.dwHostNameLength = -1;
url_comp.dwUrlPathLength = -1;
url_comp.dwExtraInfoLength = -1;
M_GTIF_WITH_LOG(SUCCEEDED(StringCchLength(url, STRSAFE_MAX_CCH, &url_len_input)), failed, LOG_LEVEL_ERROR,
__SDFILE__, __LINE__, HTTP_STRING_OPERATION_FAILED);
result = WinHttpCrackUrl(url, url_len_input, 0, &url_comp);
if (!result) {
GET_ERROR_CODE(errcode);
M_GTIF_WITH_LOG(FALSE, failed, LOG_LEVEL_ERROR, __SDFILE__, __LINE__, HTTP_CRACK_URL_FAILED, utils_format_error_string(errcode));
}
/* No need to create url because No winhttp functions accept a whole escaped url
// get new url length, allocate it
WinHttpCreateUrl(&url_comp, 0, NULL, &url_len_cracked);
M_GTIF_WITH_LOG(url_len_cracked > 0, failed, LOG_LEVEL_ERROR, __SDFILE__, __LINE__, HTTP_CREATE_URL_GET_LEN_FAILED);
// the length WinHttpCreateUrl generated is wide character numbers
url_cracked = (TCHAR *)HeapAlloc(sdc_heap, HEAP_ZERO_MEMORY, url_len_cracked * sizeof(WCHAR));
M_GTIF_WITH_LOG(url_cracked != NULL, failed, LOG_LEVEL_ERROR, __SDFILE__, __LINE__, HTTP_HEAP_ALLOC_FAILED);
// call create url again, this time get result url
result = WinHttpCreateUrl(&url_comp, 0, url_cracked, &url_len_cracked);
if (!result) {
GET_ERROR_CODE(errcode);
M_GTIF_WITH_LOG(FALSE, failed, LOG_LEVEL_ERROR, __SDFILE__, __LINE__, HTTP_CREATE_URL_FAILED, utils_format_error_string(errcode));
} */
// url OK, connect. Notice here WinHttpConnect needs Host/Server name, not the whole URL
// Request file and parameters should be set in WinHttpOpenRequest function
// get hostname
hostname_index = utils_find_char(url_comp.lpszHostName, (TCHAR)'/');
if (hostname_index < 0) {
// not found or error occurs, use the original hostname
connect = WinHttpConnect(session, url_comp.lpszHostName, INTERNET_DEFAULT_HTTP_PORT, 0);
} else {
// found "/"
memcpy_s(http_host_name, sizeof(http_host_name), url_comp.lpszHostName, hostname_index * sizeof(TCHAR));
http_host_name[hostname_index] = (TCHAR)'\0';
connect = WinHttpConnect(session, http_host_name, INTERNET_DEFAULT_HTTP_PORT, 0);
}
if (connect == NULL) {
GET_ERROR_CODE(errcode);
M_GTIF_WITH_LOG(FALSE, failed, LOG_LEVEL_ERROR, __SDFILE__, __LINE__, HTTP_CONNECT_FAILED, utils_format_error_string(errcode));
}
if (mimetype == HTTP_TEXT_MIMETYPE) {
request = WinHttpOpenRequest(connect, TEXT("GET"), url_comp.lpszUrlPath, NULL, WINHTTP_NO_REFERER,
text_mimetype, WINHTTP_FLAG_ESCAPE_PERCENT | WINHTTP_FLAG_REFRESH);
} else {
request = WinHttpOpenRequest(connect, TEXT("GET"), url_comp.lpszUrlPath, NULL, WINHTTP_NO_REFERER,
bin_mimetype, WINHTTP_FLAG_ESCAPE_PERCENT | WINHTTP_FLAG_REFRESH);
}
if (request == NULL) {
GET_ERROR_CODE(errcode);
M_GTIF_WITH_LOG(FALSE, failed, LOG_LEVEL_ERROR, __SDFILE__, __LINE__, HTTP_OPEN_REQUEST_FAILED, utils_format_error_string(errcode));
}
// Send the request
result = WinHttpSendRequest(request, WINHTTP_NO_ADDITIONAL_HEADERS, 0, WINHTTP_NO_REQUEST_DATA, 0, 0, 0 );
if (!result) {
GET_ERROR_CODE(errcode);
M_GTIF_WITH_LOG(FALSE, failed, LOG_LEVEL_ERROR, __SDFILE__, __LINE__, HTTP_SEND_REQUEST_FAILED, utils_format_error_string(errcode));
}
// Start receiving
result = WinHttpReceiveResponse(request, NULL);
if (!result) {
GET_ERROR_CODE(errcode);
M_GTIF_WITH_LOG(FALSE, failed, LOG_LEVEL_ERROR, __SDFILE__, __LINE__, HTTP_RECV_RESPONSE_FAILED, utils_format_error_string(errcode));
}
// OK, return
*sess = session;
*conn = connect;
*req = request;
return TRUE;
failed:
// Close any open handles
if (request) WinHttpCloseHandle(request);
if (connect) WinHttpCloseHandle(connect);
if (session) WinHttpCloseHandle(session);
return FALSE;
}
BOOL http_get_text(PCTSTR url, HINTERNET *sess, HINTERNET *conn, HINTERNET *req)
{
return http_get(url, sess, conn, req, HTTP_TEXT_MIMETYPE);
}
BOOL http_get_bin(PCTSTR url, HINTERNET *sess, HINTERNET *conn, HINTERNET *req)
{
return http_get(url, sess, conn, req, HTTP_BIN_MIMETYPE);
}
BOOL http_check_data_len(HINTERNET request, DWORD *len)
{
DWORD data_size = 0;
BOOL result = FALSE;
DWORD errcode;
M_RETURN_VAL_IF_FAIL(request != NULL, FALSE);
M_RETURN_VAL_IF_FAIL(len != NULL, FALSE);
M_RETURN_VAL_IF_FAIL(logger_is_enabled(), FALSE);
// Check the data length
result = WinHttpQueryDataAvailable(request, &data_size);
if (!result) {
GET_ERROR_CODE(errcode);
M_RVIF_WITH_LOG(FALSE, FALSE, LOG_LEVEL_ERROR, __SDFILE__, __LINE__, HTTP_QUERY_DATA_FAILED, utils_format_error_string(errcode));
}
M_RVIF_WITH_LOG(data_size > 0, FALSE, LOG_LEVEL_ERROR, __SDFILE__, __LINE__, HTTP_DATA_LENGTH_ILLEGAL, data_size);
*len = data_size;
return TRUE;
}
BOOL http_recv(HINTERNET request, LPVOID buffer, DWORD buffer_len, DWORD *bytes_read)
{
BOOL result = FALSE;
DWORD errcode;
M_RETURN_VAL_IF_FAIL(request != NULL, FALSE);
M_RETURN_VAL_IF_FAIL(buffer != NULL, FALSE);
M_RETURN_VAL_IF_FAIL(buffer_len > 0, FALSE);
M_RETURN_VAL_IF_FAIL(bytes_read != NULL, FALSE);
M_RETURN_VAL_IF_FAIL(logger_is_enabled(), FALSE);
// Read the Data.
SecureZeroMemory(buffer, buffer_len);
result = WinHttpReadData(request, buffer, buffer_len, bytes_read);
if (!result) {
GET_ERROR_CODE(errcode);
M_RVIF_WITH_LOG(FALSE, FALSE, LOG_LEVEL_ERROR, __SDFILE__, __LINE__, HTTP_READ_DATA_FAILED, utils_format_error_string(errcode));
}
return TRUE;
}
void http_close(HINTERNET *session, HINTERNET *connect, HINTERNET *request)
{
if (*request) WinHttpCloseHandle(*request);
if (*connect) WinHttpCloseHandle(*connect);
if (*session) WinHttpCloseHandle(*session);
*session = NULL;
*connect = NULL;
*request = NULL;
return;
}
BOOL http_check_internet(PCTSTR url)
{
HINTERNET session = NULL, connect = NULL, request = NULL;
BOOL result = FALSE;
DWORD data_len = 0;
M_RETURN_VAL_IF_FAIL(url != NULL, FALSE);
M_RETURN_VAL_IF_FAIL(logger_is_enabled(), FALSE);
result = http_get_text(url, &session, &connect, &request);
M_RETURN_VAL_IF_FAIL(result, FALSE); // logger has been done in http_send
result = http_check_data_len(request, &data_len);
M_RETURN_VAL_IF_FAIL(result, FALSE);
// internet is OK, no need to receive actual data
http_close(&session, &connect, &request);
return TRUE;
}
原帖链接： http://www.cnblogs.com/super119/archive/2011/04/10/2011350.html
ps： 这个帖子帮了我大忙， 感谢原作者！
1. GET方法。给定一个URL（可以带中文），返回http的响应数据，包括文本和二进制数据
2. 支持代理服务器，需要用户预先设定好proxy server ip, port, username, password.
不支持的有：
1. POST
2. 查询http响应的header。
3. 将返回的文本数据重新编码，变成UTF-16。这需要首先从header取出http server响应的数据是什么编码的，然后就可以使用windows的MultiByteToWideChar来进行转换。
这里总结几点开发过程中的注意点：
1. MSDN上的资料不是非常的全，所以有些参考了google得来的内容。
2. WinHttpOpen的时候，如果用AUTO PROXY，也就是让winhttp从注册表读取proxy设置的话（这个注册表的设置是proxycfg.exe生成的，和IE中的那个proxy设置是两码事）。
3. proxy的用户名和密码需要用WinHttpSetOption来进行设置, timeout设定用WinHttpSetTimeouts
4. 使用WinHttpCrackUrl可以将一个给定的url（必须以http://, https://打头）分解，设置到URL_COMPONENTS这个structure中。在这里其实就可以做url encoding（也就是将url不支持的字符转换成%xxx这样的东西），但是这样做的话需要手动给URL_COMPONENETS中的member分 配内存，比较麻烦，所以没做。
5. 使用WinHttpCreateUrl可以根据URL_COMPONENETS重新生成一个string的URL，但是这里没用到。
6. 使用WinHttpConnect的时候，一定要注意要给出hostname，不是url，所以要手动分解，只取出http server的那个部分，比如http://www.google.com/sfsdfdsf?id=xxx& user=xxxx，hostname就是www.google.com
7. 然后使用WinHttpOpenRequest的时候，就可以给出去掉了http://之后的后面所有内容了，也就是www.google.com /sfsdfdsf?id=xxx&user=xxxx这样的东西。注意最后的flag设 置：WINHTTP_FLAG_ESCAPE_PERCENT | WINHTTP_FLAG_REFRESH，这两个很有用，WINHTTP_FLAG_ESCAPE_PERCENT就是将url中不合法的内容转 成%xxx，WINHTTP_FLAG_REFRESH就是跳过proxy的cache，每次都请求全新的数据。还有需要注意的
是，WinHttpOpenRequest中，要求给出我们能接受的mimetype，这里可以参考代码，如果要文本，就给text/*，如果要二进制数 据，就可以像这里给出application/*, image/*, audio/*......
8. 最后WinHttpSendRequest的时候，也可以设定additional header和optional数据。这里的optional数据一般是用于POST的，也就是将需要post到server的数据填充在这个地方。 WinHttpSendRequest将header都发送出去之后，紧接着就会发送这个optional数据。
9. WinHttpQueryDataAvailable可以check是否还有数据需要接收。WinHttpReadData用来读取数据，注意读出来的数 据就是字节流，像前面所说，如果是文本，那么要根据response header，首先知道是什么编码和字符集，然后再用MultiByteToWideChar来转换。也要注意WinHttpReadData的最后一个 参数，给出了实际读取到的字节数，也可以根据这个信息来判断是否已经接收完了。此外特别需要注意的是，如果用的是一个固定的buffer循环接收，就像这 里一样，那么不要忘记接收完成的时候，要在尾部加上\0，分配buffer的时候也要留出\0的位置。
/*
* Schedule Download Http utilities, based on winhttp
* Written by Eric Zhang <nicolas.m.zhang@gmail.com>
*/
#include "..\include\http.h"
#include "..\include\logger.h"
#include "..\include\utils.h"
#include "..\include\defs.h"
#include "..\include\macros.h"
#include <strsafe.h>
// http server's hostname length
#define HTTP_HOST_NAME_MAX 255
#define HTTP_TEXT_MIMETYPE 1
#define HTTP_BIN_MIMETYPE 2
// mimetypes for WinHttpOpenRequest
LPCWSTR text_mimetype[] = { L"text/*", L"\0" };
LPCWSTR bin_mimetype[] = { L"application/*", L"audio/*", L"image/*", L"video/*", L"\0" };
/*
* This function used internally. It checks the proxy settings and apply
* to the WinHttp. Return winhttp session handle if succeeded, otherwise
* return NULL.
*/
static HINTERNET open_winhttp()
{
HINTERNET session = NULL;
TCHAR proxy_enabled[REGISTRY_VALUE_SIZE];
TCHAR proxy_server[REGISTRY_VALUE_SIZE];
TCHAR proxy_port[REGISTRY_VALUE_SIZE];
TCHAR proxy_username[REGISTRY_VALUE_SIZE];
TCHAR proxy_password[REGISTRY_VALUE_SIZE];
DWORD errcode;
size_t proxy_username_len = 0;
size_t proxy_password_len = 0;
// Check whether the proxy has enabled
SecureZeroMemory(proxy_enabled, sizeof(proxy_enabled));
utils_get_registry_value(SD_REGISTRY_KEY, HTTP_PROXY_ENABLED_ENTRY, proxy_enabled, sizeof(proxy_enabled));
if (utils_is_string_empty(proxy_enabled) || _tcscmp(proxy_enabled, TEXT("Y")) != 0) {
// proxy isn't enabled, direct connect
session = WinHttpOpen(HTTP_AGENT_NAME, WINHTTP_ACCESS_TYPE_NO_PROXY, WINHTTP_NO_PROXY_NAME, WINHTTP_NO_PROXY_BYPASS, 0);
if (session == NULL) {
GET_ERROR_CODE(errcode);
M_GTIF_WITH_LOG(FALSE, failed, LOG_LEVEL_ERROR, __SDFILE__, __LINE__, HTTP_NO_PROXY_OPEN_FAILED, utils_format_error_string(errcode));
}
} else {
// proxy enabled, read server/port/user/pass next
SecureZeroMemory(proxy_server, sizeof(proxy_server));
SecureZeroMemory(proxy_port, sizeof(proxy_port));
SecureZeroMemory(proxy_username, sizeof(proxy_username));
SecureZeroMemory(proxy_password, sizeof(proxy_password));
utils_get_registry_value(SD_REGISTRY_KEY, HTTP_PROXY_SERVER_ENTRY, proxy_server, sizeof(proxy_server));
utils_get_registry_value(SD_REGISTRY_KEY, HTTP_PROXY_PORT_ENTRY, proxy_port, sizeof(proxy_port));
utils_get_registry_value(SD_REGISTRY_KEY, HTTP_PROXY_USER_ENTRY, proxy_username, sizeof(proxy_username));
utils_get_registry_value(SD_REGISTRY_KEY, HTTP_PROXY_PASS_ENTRY, proxy_password, sizeof(proxy_password));
M_GTIF_WITH_LOG(!utils_is_string_empty(proxy_server), failed, LOG_LEVEL_ERROR, __SDFILE__, __LINE__, HTTP_PROXY_SERVER_ABSENT);
M_GTIF_WITH_LOG(!utils_is_string_empty(proxy_port), failed, LOG_LEVEL_ERROR, __SDFILE__, __LINE__, HTTP_PROXY_PORT_ABSENT);
M_GTIF_WITH_LOG(utils_is_string_int(proxy_port), failed, LOG_LEVEL_ERROR, __SDFILE__, __LINE__, HTTP_PROXY_PORT_ILLEGAL);
// add port into server string
M_GTIF_WITH_LOG(SUCCEEDED(StringCchPrintf(proxy_server, _countof(proxy_server), TEXT("%s:%s"), proxy_server, proxy_port)), failed,
LOG_LEVEL_ERROR, __SDFILE__, __LINE__, HTTP_STRING_OPERATION_FAILED);
// open
session = WinHttpOpen(HTTP_AGENT_NAME, WINHTTP_ACCESS_TYPE_NAMED_PROXY, proxy_server, WINHTTP_NO_PROXY_BYPASS, 0);
if (session == NULL) {
GET_ERROR_CODE(errcode);
M_GTIF_WITH_LOG(FALSE, failed, LOG_LEVEL_ERROR, __SDFILE__, __LINE__, HTTP_OPEN_WITH_PROXY_FAILED, utils_format_error_string(errcode));
}
// set proxy username & password
if (!utils_is_string_empty(proxy_username) && !utils_is_string_empty(proxy_password)) {
M_GTIF_WITH_LOG(SUCCEEDED(StringCchLength(proxy_username, _countof(proxy_username), &proxy_username_len)), failed,
LOG_LEVEL_ERROR, __SDFILE__, __LINE__, HTTP_STRING_OPERATION_FAILED);
M_GTIF_WITH_LOG(SUCCEEDED(StringCchLength(proxy_password, _countof(proxy_password), &proxy_password_len)), failed,
LOG_LEVEL_ERROR, __SDFILE__, __LINE__, HTTP_STRING_OPERATION_FAILED);
if (!WinHttpSetOption(session, WINHTTP_OPTION_PROXY_USERNAME, proxy_username, proxy_username_len)) {
GET_ERROR_CODE(errcode);
M_GTIF_WITH_LOG(FALSE, failed, LOG_LEVEL_ERROR, __SDFILE__, __LINE__, HTTP_SET_PROXY_USER_FAILED, utils_format_error_string(errcode));
}
if (!WinHttpSetOption(session, WINHTTP_OPTION_PROXY_PASSWORD, proxy_password, proxy_password_len)) {
GET_ERROR_CODE(errcode);
M_GTIF_WITH_LOG(FALSE, failed, LOG_LEVEL_ERROR, __SDFILE__, __LINE__, HTTP_SET_PROXY_PASS_FAILED, utils_format_error_string(errcode));
}
}
}
// set timeouts
if (!WinHttpSetTimeouts(session, HTTP_RESOLVE_TO, HTTP_CONNECT_TO, HTTP_SEND_TO, HTTP_RECV_TO)) {
GET_ERROR_CODE(errcode);
M_GTIF_WITH_LOG(FALSE, failed, LOG_LEVEL_ERROR, __SDFILE__, __LINE__, HTTP_SET_TIMEOUTS_FAILED, utils_format_error_string(errcode));
}
return session;
failed:
if (session != NULL) WinHttpCloseHandle(session);
return NULL;
}
static BOOL http_get(PCTSTR url, HINTERNET *sess, HINTERNET *conn, HINTERNET *req, DWORD mimetype)
{
HINTERNET session = NULL, connect = NULL, request = NULL;
BOOL result = FALSE;
DWORD errcode;
URL_COMPONENTS url_comp;
size_t url_len_input;
TCHAR http_host_name[HTTP_HOST_NAME_MAX];
int hostname_index;
M_RETURN_VAL_IF_FAIL(url != NULL, FALSE);
M_RETURN_VAL_IF_FAIL(sess != NULL, FALSE);
M_RETURN_VAL_IF_FAIL(conn != NULL, FALSE);
M_RETURN_VAL_IF_FAIL(req != NULL, FALSE);
M_RETURN_VAL_IF_FAIL(logger_is_enabled(), FALSE);
session = open_winhttp();
M_RETURN_VAL_IF_FAIL(session != NULL, FALSE); // log has been done in open_winhttp function
// crack url input
// Initialize the URL_COMPONENTS structure.
SecureZeroMemory(&url_comp, sizeof(url_comp));
url_comp.dwStructSize = sizeof(url_comp);
// Set required component lengths to non-zero
// so that they are cracked.
url_comp.dwSchemeLength = -1;
url_comp.dwHostNameLength = -1;
url_comp.dwUrlPathLength = -1;
url_comp.dwExtraInfoLength = -1;
M_GTIF_WITH_LOG(SUCCEEDED(StringCchLength(url, STRSAFE_MAX_CCH, &url_len_input)), failed, LOG_LEVEL_ERROR,
__SDFILE__, __LINE__, HTTP_STRING_OPERATION_FAILED);
result = WinHttpCrackUrl(url, url_len_input, 0, &url_comp);
if (!result) {
GET_ERROR_CODE(errcode);
M_GTIF_WITH_LOG(FALSE, failed, LOG_LEVEL_ERROR, __SDFILE__, __LINE__, HTTP_CRACK_URL_FAILED, utils_format_error_string(errcode));
}
/* No need to create url because No winhttp functions accept a whole escaped url
// get new url length, allocate it
WinHttpCreateUrl(&url_comp, 0, NULL, &url_len_cracked);
M_GTIF_WITH_LOG(url_len_cracked > 0, failed, LOG_LEVEL_ERROR, __SDFILE__, __LINE__, HTTP_CREATE_URL_GET_LEN_FAILED);
// the length WinHttpCreateUrl generated is wide character numbers
url_cracked = (TCHAR *)HeapAlloc(sdc_heap, HEAP_ZERO_MEMORY, url_len_cracked * sizeof(WCHAR));
M_GTIF_WITH_LOG(url_cracked != NULL, failed, LOG_LEVEL_ERROR, __SDFILE__, __LINE__, HTTP_HEAP_ALLOC_FAILED);
// call create url again, this time get result url
result = WinHttpCreateUrl(&url_comp, 0, url_cracked, &url_len_cracked);
if (!result) {
GET_ERROR_CODE(errcode);
M_GTIF_WITH_LOG(FALSE, failed, LOG_LEVEL_ERROR, __SDFILE__, __LINE__, HTTP_CREATE_URL_FAILED, utils_format_error_string(errcode));
} */
// url OK, connect. Notice here WinHttpConnect needs Host/Server name, not the whole URL
// Request file and parameters should be set in WinHttpOpenRequest function
// get hostname
hostname_index = utils_find_char(url_comp.lpszHostName, (TCHAR)'/');
if (hostname_index < 0) {
// not found or error occurs, use the original hostname
connect = WinHttpConnect(session, url_comp.lpszHostName, INTERNET_DEFAULT_HTTP_PORT, 0);
} else {
// found "/"
memcpy_s(http_host_name, sizeof(http_host_name), url_comp.lpszHostName, hostname_index * sizeof(TCHAR));
http_host_name[hostname_index] = (TCHAR)'\0';
connect = WinHttpConnect(session, http_host_name, INTERNET_DEFAULT_HTTP_PORT, 0);
}
if (connect == NULL) {
GET_ERROR_CODE(errcode);
M_GTIF_WITH_LOG(FALSE, failed, LOG_LEVEL_ERROR, __SDFILE__, __LINE__, HTTP_CONNECT_FAILED, utils_format_error_string(errcode));
}
if (mimetype == HTTP_TEXT_MIMETYPE) {
request = WinHttpOpenRequest(connect, TEXT("GET"), url_comp.lpszUrlPath, NULL, WINHTTP_NO_REFERER,
text_mimetype, WINHTTP_FLAG_ESCAPE_PERCENT | WINHTTP_FLAG_REFRESH);
} else {
request = WinHttpOpenRequest(connect, TEXT("GET"), url_comp.lpszUrlPath, NULL, WINHTTP_NO_REFERER,
bin_mimetype, WINHTTP_FLAG_ESCAPE_PERCENT | WINHTTP_FLAG_REFRESH);
}
if (request == NULL) {
GET_ERROR_CODE(errcode);
M_GTIF_WITH_LOG(FALSE, failed, LOG_LEVEL_ERROR, __SDFILE__, __LINE__, HTTP_OPEN_REQUEST_FAILED, utils_format_error_string(errcode));
}
// Send the request
result = WinHttpSendRequest(request, WINHTTP_NO_ADDITIONAL_HEADERS, 0, WINHTTP_NO_REQUEST_DATA, 0, 0, 0 );
if (!result) {
GET_ERROR_CODE(errcode);
M_GTIF_WITH_LOG(FALSE, failed, LOG_LEVEL_ERROR, __SDFILE__, __LINE__, HTTP_SEND_REQUEST_FAILED, utils_format_error_string(errcode));
}
// Start receiving
result = WinHttpReceiveResponse(request, NULL);
if (!result) {
GET_ERROR_CODE(errcode);
M_GTIF_WITH_LOG(FALSE, failed, LOG_LEVEL_ERROR, __SDFILE__, __LINE__, HTTP_RECV_RESPONSE_FAILED, utils_format_error_string(errcode));
}
// OK, return
*sess = session;
*conn = connect;
*req = request;
return TRUE;
failed:
// Close any open handles
if (request) WinHttpCloseHandle(request);
if (connect) WinHttpCloseHandle(connect);
if (session) WinHttpCloseHandle(session);
return FALSE;
}
BOOL http_get_text(PCTSTR url, HINTERNET *sess, HINTERNET *conn, HINTERNET *req)
{
return http_get(url, sess, conn, req, HTTP_TEXT_MIMETYPE);
}
BOOL http_get_bin(PCTSTR url, HINTERNET *sess, HINTERNET *conn, HINTERNET *req)
{
return http_get(url, sess, conn, req, HTTP_BIN_MIMETYPE);
}
BOOL http_check_data_len(HINTERNET request, DWORD *len)
{
DWORD data_size = 0;
BOOL result = FALSE;
DWORD errcode;
M_RETURN_VAL_IF_FAIL(request != NULL, FALSE);
M_RETURN_VAL_IF_FAIL(len != NULL, FALSE);
M_RETURN_VAL_IF_FAIL(logger_is_enabled(), FALSE);
// Check the data length
result = WinHttpQueryDataAvailable(request, &data_size);
if (!result) {
GET_ERROR_CODE(errcode);
M_RVIF_WITH_LOG(FALSE, FALSE, LOG_LEVEL_ERROR, __SDFILE__, __LINE__, HTTP_QUERY_DATA_FAILED, utils_format_error_string(errcode));
}
M_RVIF_WITH_LOG(data_size > 0, FALSE, LOG_LEVEL_ERROR, __SDFILE__, __LINE__, HTTP_DATA_LENGTH_ILLEGAL, data_size);
*len = data_size;
return TRUE;
}
BOOL http_recv(HINTERNET request, LPVOID buffer, DWORD buffer_len, DWORD *bytes_read)
{
BOOL result = FALSE;
DWORD errcode;
M_RETURN_VAL_IF_FAIL(request != NULL, FALSE);
M_RETURN_VAL_IF_FAIL(buffer != NULL, FALSE);
M_RETURN_VAL_IF_FAIL(buffer_len > 0, FALSE);
M_RETURN_VAL_IF_FAIL(bytes_read != NULL, FALSE);
M_RETURN_VAL_IF_FAIL(logger_is_enabled(), FALSE);
// Read the Data.
SecureZeroMemory(buffer, buffer_len);
result = WinHttpReadData(request, buffer, buffer_len, bytes_read);
if (!result) {
GET_ERROR_CODE(errcode);
M_RVIF_WITH_LOG(FALSE, FALSE, LOG_LEVEL_ERROR, __SDFILE__, __LINE__, HTTP_READ_DATA_FAILED, utils_format_error_string(errcode));
}
return TRUE;
}
void http_close(HINTERNET *session, HINTERNET *connect, HINTERNET *request)
{
if (*request) WinHttpCloseHandle(*request);
if (*connect) WinHttpCloseHandle(*connect);
if (*session) WinHttpCloseHandle(*session);
*session = NULL;
*connect = NULL;
*request = NULL;
return;
}
BOOL http_check_internet(PCTSTR url)
{
HINTERNET session = NULL, connect = NULL, request = NULL;
BOOL result = FALSE;
DWORD data_len = 0;
M_RETURN_VAL_IF_FAIL(url != NULL, FALSE);
M_RETURN_VAL_IF_FAIL(logger_is_enabled(), FALSE);
result = http_get_text(url, &session, &connect, &request);
M_RETURN_VAL_IF_FAIL(result, FALSE); // logger has been done in http_send
result = http_check_data_len(request, &data_len);
M_RETURN_VAL_IF_FAIL(result, FALSE);
// internet is OK, no need to receive actual data
http_close(&session, &connect, &request);
return TRUE;
}
原帖链接： http://www.cnblogs.com/super119/archive/2011/04/10/2011350.html
ps： 这个帖子帮了我大忙， 感谢原作者！
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