VC/MFC 设置程序与文件关联与双击文件获取文件路径

如何设置程序与文件关联并且双击关联文件时获取文件的路径呢？

一般来说可以通过写注册表的方式实现，在函数入口处实现功能。

例如在VC/MFC中，可以在应用程序的C**App.cpp文件中InitInstance()函数中实现该功能。

#include <string>

using namespace std;

//关联文件的后缀名，如"txt"、"doc"等

string m_csExtension;
string m_csShellOpenCommand;

string m_csDocumentShellOpenCommand;

//注册表中文件夹类名

string m_csDocumentClassName;

//关联文件的默认图标
string m_csDocumentDefaultIcon;

///////赋值函数//////

void SetExtension( LPCTSTR szExtension )
{
m_csExtension = szExtension;
}

void SetShellOpenCommand( LPCTSTR szShellOpenCommand )

{
m_csShellOpenCommand = szShellOpenCommand;
}

void SetDocumentShellOpenCommand( LPCTSTR szDocumentShellOpenCommand )

{
m_csDocumentShellOpenCommand = szDocumentShellOpenCommand;
}

void SetDocumentClassName( LPCTSTR szDocumentClassName )

{
m_csDocumentClassName = szDocumentClassName;
}

void SetDocumentDefaultIcon( LPCTSTR szDocumentDefaultIcon )

{
m_csDocumentDefaultIcon = szDocumentDefaultIcon;
}

///////赋值函数//////

//////关键函数：实现写注册表的函数////////

BOOL SetRegistryValue(
HKEY hOpenKey,
LPCTSTR szKey,
LPCTSTR szValue,
LPCTSTR szData
){
// validate input
if( !hOpenKey || !szKey || !szKey[0] ||
!szValue || !szData ){
::SetLastError(E_INVALIDARG);
return FALSE;
}

BOOL bRetVal = FALSE;
DWORD dwDisposition;
DWORD dwReserved = 0;
HKEY hTempKey = (HKEY)0;

// length specifier is in bytes, and some TCHAR
// are more than 1 byte each
DWORD dwBufferLength = lstrlen(szData) * sizeof(TCHAR);

// Open key of interest
// Assume all access is okay and that all keys will be stored to file
// Utilize the default security attributes
if( ERROR_SUCCESS == ::RegCreateKeyEx(hOpenKey, szKey, dwReserved,
(LPTSTR)0, REG_OPTION_NON_VOLATILE, KEY_SET_VALUE, 0,
&hTempKey, &dwDisposition) ){

// dwBufferLength must include size of terminating nul
// character when using REG_SZ with RegSetValueEx function
dwBufferLength += sizeof(TCHAR);

if( ERROR_SUCCESS == ::RegSetValueEx(hTempKey, (LPTSTR)szValue,
dwReserved, REG_SZ, (LPBYTE)szData, dwBufferLength) ){
bRetVal = TRUE;
}
}

// close opened key
if( hTempKey ){
::RegCloseKey(hTempKey);
}

return bRetVal;
}

BOOL RegSetExtension(void)
{
if( m_csExtension.empty() )
{
return FALSE;
}

std::string csKey = "." + m_csExtension;

SetRegistryValue(HKEY_CLASSES_ROOT, csKey.c_str(), "", m_csDocumentClassName.c_str());

if( !m_csShellOpenCommand.empty() )
{
csKey += "//shell//open//command";
SetRegistryValue(HKEY_CLASSES_ROOT, csKey.c_str(), "", m_csShellOpenCommand.c_str());
}

return TRUE;
}

BOOL RegSetDocumentType(void)
{
if( m_csDocumentClassName.empty())
{
return FALSE;
}

std::string csKey = m_csDocumentClassName;

SetRegistryValue(HKEY_CLASSES_ROOT, csKey.c_str(), "", m_csDocumentDescription.c_str());

// DefaultIcon
if( !m_csDocumentDefaultIcon.empty() )
{
csKey = m_csDocumentClassName;
csKey += "//DefaultIcon";
SetRegistryValue(HKEY_CLASSES_ROOT, csKey.c_str(), "", m_csDocumentDefaultIcon.c_str());
}

// shell/open/command
if( !m_csShellOpenCommand.empty() )
{
csKey = m_csDocumentClassName;
csKey += "//shell//open//command";
SetRegistryValue(HKEY_CLASSES_ROOT, csKey.c_str(), "", m_csShellOpenCommand.c_str());
}

return TRUE;
}

BOOL RegSetAllInfo(void)
{
RegSetExtension();
RegSetDocumentType();

return TRUE;
}

//注册程序与文件后缀名的关联
void RegisterFileAndProgram()
{

////一个应用程序与多个文件后缀关联////
#define strExternsionLength 4

LPCTSTR strExtension[] =
{
"bmp",
"jpg",
"jpe",
"jpeg"
};

CGCFileTypeAccess TheFTA;

TCHAR szProgPath[MAX_PATH * 2];

//获取程序路径

::GetModuleFileName(NULL, szProgPath, sizeof(szProgPath)/sizeof(TCHAR));

CString csTempText;

for(int i = 0; i < strExternsionLength; ++i)
{

//设置程序需要关联的后缀名,如"txt" "doc" 等

SetExtension(strExtension[i]);

csTempText.Format("/"%s/" %s",szProgPath,"/"%1/"");

SetShellOpenCommand(csTempText);

SetDocumentShellOpenCommand(csTempText);

//设置注册表中文件类的别名，例如可以是程序名称:**.exe

SetDocumentClassName("**");

// use first icon in program

csTempText = szProgPath;

csTempText += ",0";

SetDocumentDefaultIcon(csTempText);

RegSetAllInfo();

}
}

//入口函数：初始化所需的操作

BOOL C**App::InitInstance()

{

//////////

//***Code***

////////

//注册程序与文件后缀名的关联
RegisterFileAndProgram();

// 分析标准外壳命令、DDE、打开文件操作的命令行
CCommandLineInfo cmdInfo;
ParseCommandLine(cmdInfo);
//获取命令行传过来的参数：双击打开的文件的文件路径名称
CString strFilePathName = cmdInfo.m_strFileName;

// 调度在命令行中指定的命令。如果
// 用 /RegServer、/Register、/Unregserver 或 /Unregister 启动应用程序，则返回 FALSE。
if (!ProcessShellCommand(cmdInfo))
return FALSE;

//////////

//通过获取的strFilePathName文件名称实现相关操作//

//Add code here//

////////

return TRUE;

}