Use wildcards with FindWindow api call with mfc
I am using FindWindow in an mfc application.
HWND hWnd = ::FindWindow(NULL, _T("foobar v5")开发者_JAVA技巧);
I would like to use FindWindow with wildcards so that I can match just foobar.
Thanks
You will have to create your own implementation which should be based on EnumWindows, GetWindowText and GetWindowTextLength which then must allow the wildcards.
#include <Windows.h>
#include <iostream>
#include <string>
#include <vector>
struct FindWindowData {
FindWindowData( TCHAR const * windowTitle )
: WindowTitle( windowTitle )
, ResultHandle( 0 )
{}
std::basic_string<TCHAR> WindowTitle;
HWND ResultHandle;
};
BOOL CALLBACK FindWindowImpl( HWND hWnd, LPARAM lParam ) {
FindWindowData * p = reinterpret_cast<FindWindowData*>( LongToPtr( lParam ) );
if( !p ) {
// Finish enumerating we received an invalid parameter
return FALSE;
}
int length = GetWindowTextLength( hWnd ) + 1;
if( length > 0 ) {
std::vector<TCHAR> buffer( std::size_t( length ), 0 );
if( GetWindowText( hWnd, &buffer[0], length ) ) {
// Comparing the string - If you want to add some features you can do it here
if( _tcsnicmp( &buffer[0], p->WindowTitle.c_str(), min( buffer.size(), p->WindowTitle.size() ) ) == 0 ) {
p->ResultHandle = hWnd;
// Finish enumerating we found what we need
return FALSE;
}
}
}
// Continue enumerating
return TRUE;
}
// Returns the window handle when found if it returns 0 GetLastError() will return more information
HWND FindWindowStart( TCHAR const * windowTitle ) {
if( !windowTitle ) {
SetLastError( ERROR_INVALID_PARAMETER );
return 0;
}
FindWindowData data( windowTitle );
if( !EnumWindows( FindWindowImpl, PtrToLong(&data) ) && data.ResultHandle != 0 ) {
SetLastError( ERROR_SUCCESS );
return data.ResultHandle;
}
// Return ERROR_FILE_NOT_FOUND in GetLastError
SetLastError( ERROR_FILE_NOT_FOUND );
return 0;
}
int _tmain(int argc, _TCHAR* argv[])
{
std::cout << "HWND: " << FindWindowStart(TEXT("foobar ") );
std::cout << " GetLastError() = " << GetLastError() << std::endl;
return 0;
}
Unfortunately, FindWindow() does not support wildcards.
Did you try matching the window class name instead of its title? You can use a tool like Spy++ to find out the class name of the foobar
main window.
精彩评论