26.1.txt

《Microsoft Visual C# .NET 2003开发技巧大全》源代码

Listing 26.1 Enumerating Windows with C++
#include “stdafx.h”
#include “MessageWindowNative.h”
#ifdef MESSAGEWINDOWNATIVE_EXPORTS
#define MESSAGEWINDOWNATIVE_API __declspec(dllexport)
#else
#define MESSAGEWINDOWNATIVE_API __declspec(dllimport)
#endif
// entry point method for DLL’s
BOOL APIENTRY DllMain( HANDLE hModule,
DWORD ul_reason_for_call,
LPVOID lpReserved )
{
switch (ul_reason_for_call)
{
case DLL_PROCESS_ATTACH:
case DLL_THREAD_ATTACH:
case DLL_THREAD_DETACH:
case DLL_PROCESS_DETACH:
break;
}
return TRUE;
}
// Window message value to send
#define WM_USER_ADDWINDOW WM_USER + 1
BOOL CALLBACK EnumWindowsProc( HWND hwnd, LPARAM lParam )
{
WPARAM wParam = 0;
if( GetParent( hwnd ) != NULL )
wParam = 1;
// post message to C# application
PostMessage( (HWND) lParam, WM_USER_ADDWINDOW, wParam, (LPARAM) hwnd );
return TRUE;
}
extern “C”
{
MESSAGEWINDOWNATIVE_API void EnumerateDeviceWindows( HWND hCallbackWnd )
{
EnumWindows( EnumWindowsProc, (LPARAM) hCallbackWnd );
}
}