C/C++轻松实现文件下载

首先，我们先来了解几个API

_getcwd

Gets the current working directory.

char *_getcwd(
char *buffer,
int maxlen
);

buffer

Storage location for the path.

maxlen

Maximum length of the path in characters: char for _getcwd and wchar_t for _wgetcwd.
易知：buffer是路径

maxlen：是长度

功能是得到当前程序的路径

下一个API

URLDownloadToFile function

Downloads bits from the Internet and saves them to a file.

char *_getcwd(
char *buffer,
int maxlen
);
wchar_t *_wgetcwd(
wchar_t *buffer,
int maxlen
);





下面是代码：

#include <Windows.h>
#include <stdio.h>
#include <direct.h>
#pragma comment(lib,"URlmon")

int main()
{
char buffer[MAX_PATH];
_getcwd(buffer, MAX_PATH);
strcat_s(buffer, "//1.jpg");
HRESULT Result = URLDownloadToFileA(NULL, "http://112.22.245.11:443/down/de0243d60205717a2a74aea53c0c500c-46353/1.jpg?cts=yd-f-U13274580&ctp=111A23A228A125&ctt=1484747960&limit=1&spd=1300000&ctk=4ab73a4a76e47ad0b181d0f9fc47b6a1&chk=de0243d60205717a2a74aea53c0c500c-46353", buffer, 0, NULL);
switch (Result)
{
case S_OK:printf("The download started successfully.\n");break;
case E_OUTOFMEMORY: printf("The buffer length is invalid, or there is insufficient memory to complete the operation.\n"); break;
}
return 0;
}程序运行截图：