为啥消息都给了父窗口？

[time_is_life]

我在做<Windows程序设计>的Checker3例子。

#include <Windows.h>

#define DIVISIONS 5

LRESULT CALLBACK wWinProc( HWND, UINT, WPARAM, LPARAM );
LRESULT CALLBACK wChildWinProc( HWND, UINT, WPARAM, LPARAM );

TCHAR szChildClass[] = TEXT("Checker3_Child");

int WINAPI WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCommandLine, int iCmdShow )
{
	static TCHAR szAppName[] = TEXT("Checker3_Child");

	HWND hWnd;
	MSG msg;
	WNDCLASS wndclass;

	wndclass.style = CS_HREDRAW | CS_VREDRAW;
	wndclass.lpfnWndProc = wWinProc;
	wndclass.cbClsExtra = 0;
	wndclass.cbWndExtra = 0;
	wndclass.hInstance = hInstance;
	wndclass.hIcon = LoadIcon( NULL, IDI_APPLICATION );
	wndclass.hCursor = LoadIcon( NULL, IDC_ARROW );
	wndclass.hbrBackground = (HBRUSH)GetStockObject( WHITE_BRUSH );
	wndclass.lpszMenuName = NULL;
	wndclass.lpszClassName = szAppName;

	if ( !RegisterClass( &wndclass ) )
	{
		MessageBox( NULL, TEXT("This program requires Windows NT!"), 
				szAppName, MB_ICONERROR );
		return 0;
	}

	wndclass.lpfnWndProc = wChildWinProc;
	wndclass.cbWndExtra = sizeof( long );
	wndclass.hIcon = NULL;
	wndclass.lpszClassName = szChildClass;

	RegisterClass(  &wndclass );

	hWnd = CreateWindow( szAppName,  //windows class name
					TEXT("Checker3 Mouse Hit-Test Demo"), // windows caption.
					WS_OVERLAPPEDWINDOW, //windows style.
					CW_USEDEFAULT, // initial X positon. 
					CW_USEDEFAULT, // initial Y positon.
					CW_USEDEFAULT, // initial X size.
					CW_USEDEFAULT, // initial Y positon.
					NULL,  //Parent window handle. 
					NULL, //window menu handle.
					hInstance, // program instance handle.
					NULL); // creation parameters.

	ShowWindow( hWnd, iCmdShow );
	UpdateWindow( hWnd );

	while( GetMessage( &msg, NULL, 0, 0 ) )
	{
		TranslateMessage( &msg );
		DispatchMessage( &msg );
	}

	return msg.wParam;

}

LRESULT CALLBACK wWinProc( HWND hwnd, UINT message, WPARAM  wParam, LPARAM lParam )
{
	static HWND hwndChild[DIVISIONS][DIVISIONS];
	int cxBlock, cyBlock, x,y;

	switch (message)
	{
	case WM_CREATE:
		for( x = 0; x < DIVISIONS; x++ )
			for( y = 0; y < DIVISIONS ; y++ )
				hwndChild[x][y] = CreateWindow( szChildClass, NULL, 
						WS_CHILDWINDOW | WS_VISIBLE, 
						0, 0, 0, 0, 
						hwnd, (HMENU)( y << 8 | x ),
						(HINSTANCE)GetWindowLong( hwnd, GWL_HINSTANCE ), 
						NULL );
		return 0;
	case WM_SIZE:
		cxBlock = LOWORD( lParam ) / DIVISIONS;
		cyBlock = HIWORD( lParam ) / DIVISIONS;
		
		for( x = 0; x < DIVISIONS; x++ )
			for( y = 0; y < DIVISIONS; y++ )
			{
				MoveWindow( hwndChild[x][y] ,
						x * cxBlock, y * cyBlock, 
						cxBlock, cyBlock, TRUE );
			}
		return 0;
	case WM_LBUTTONDOWN:
		MessageBeep( 0 );
		return 0;

	case WM_DESTROY:
		PostQuitMessage(0);
		return 0;
	}

	return DefWindowProc( hwnd, message, wParam, lParam );
}



LRESULT CALLBACK wChildWinProc( HWND hwnd, UINT message, WPARAM  wParam, LPARAM lParam )
{
	HDC hdc;
	PAINTSTRUCT ps;
	RECT rect;

	switch (message)
	{
	case WM_CREATE:
		SetWindowLong( hwnd, 0, 0 );
		return 0;
	case WM_LBUTTONDOWN:
		SetWindowLong( hwnd, 0, 1 ^ GetWindowLong( hwnd, 0 ));
		InvalidateRect( hwnd, NULL, FALSE );
		return 0;

	case WM_PAINT:
		hdc = BeginPaint( hwnd, &ps );
		 
		GetClientRect( hwnd, &rect);
		Rectangle( hdc, 0, 0, rect.right, rect.bottom );

		if( GetWindowLong( hwnd, 0 ) )
		{
			MoveToEx( hdc, 0, 0, NULL );
			LineTo( hdc, rect.right, rect.bottom );
			MoveToEx( hdc, 0, rect.bottom, NULL );
			LineTo( hdc, rect.right, 0 );
		}

		EndPaint( hwnd, &ps );

		return 0;
	case WM_DESTROY:
		PostQuitMessage(0);
		return 0;
	}

	return DefWindowProc( hwnd, message, wParam, lParam );
}

程序运行不正常，打断点跟踪，发现所有的消息都发送给了wWinProc， wChildWinProc没有收到任何消息。
为什么那？请高手指教，谢谢。

[worldy]

szChildClass的窗口类在哪注册了窗口类？没看到注册

[encoderlee]

把TCHAR szChildClass[] = TEXT("Checker3_Child"); 改成TCHAR szChildClass[] = TEXT("Checker3_Child2"); 就行了。 你两个窗口的类名不能相同，否则子窗口注册失败。

[schlafenhamster]

注册失败 static TCHAR szAppName[] = TEXT("Checker3_Main"); static TCHAR szChildClass[] = TEXT("Checker3_Child");

[bluesky_ql]

同意一楼二楼，你这个错误实际上调试的时候很好找，但是因为你41行的代码没有判断返回值正确与否，导致后面你不知道发生了什么，所以判断返回值是否正确是个好的编程习惯