win32应用程序窗口创造

win32应用程序窗口创建
我在win32 应用程序中创建了一个窗口，再往上面添加button和EditControl的时候，发现按钮一点击程序就退出了，EditControl也是同样的现象，求教如何解，代码如下：

LRESULT CALLBACK WndProc(HWND hwnd, UINT message,WPARAM wParam,LPARAM lParam)

{

	HDC hdc;

	PAINTSTRUCT ps;

	HINSTANCE hInstance;

	switch(message)

	{

	case WM_CREATE:

		//创建按钮和编辑框

		{

			CreateWindow("Button","打开串口",WS_VISIBLE|WS_CHILD|BS_PUSHBUTTON,35,45,160,65,hwnd,NULL/*(HMENU)IDB_ONE*/,hInstance,NULL);

			CreateWindow("Button","关闭串口",WS_VISIBLE|WS_CHILD|BS_PUSHBUTTON,35,110,160,65,hwnd,NULL/*(HMENU)IDB_TWO*/,hInstance,NULL);

			CreateWindow("Button","发送",WS_VISIBLE|WS_CHILD|BS_PUSHBUTTON,35,175,160,65,hwnd,NULL/*(HMENU)IDB_THREE*/,hInstance,NULL);

			//CreateWindowEx(0L,"Edit", NULL,WS_CHILD|WS_BORDER|WS_VISIBLE|ES_LEFT|ES_AUTOVSCROLL| ES_MULTILINE,195,45,160,45,hwnd,NULL,hInstance,NULL);

			//CreateWindowEx(0L,"Edit", NULL,WS_CHILD|WS_BORDER|WS_VISIBLE|ES_LEFT|ES_AUTOVSCROLL| ES_MULTILINE,195,45,160,45,hwnd,NULL,hInstance,NULL);

			CreateWindow("Edit",NULL,WS_CHILD|WS_VISIBLE|ES_AUTOVSCROLL|WS_BORDER|ES_LEFT|ES_MULTILINE,195,45,160,45,hwnd,(HMENU)IDC_FOUR,hInstance,NULL);

		}

		return(0);

	case WM_PAINT:

		hdc = BeginPaint(hwnd,&ps);

		TextOut(hdc,0,0,"A Window",27);

		EndPaint(hwnd,&ps);

		return(0);

	case WM_COMMAND:

		{

			switch(LOWORD(wParam))

			{//按钮事件

			case IDB_ONE:

				{

				char sztext[4];

				HWND hwndEdit1 = ::GetDlgItem(hwnd,IDC_FOUR);

				GetWindowText(hwndEdit1,sztext,4);

				MessageBox(NULL,sztext,"caution",MB_OK|MB_ICONINFORMATION);

				//SendMessage((HWND)lParam, WM_SETTEXT, (WPARAM)NULL, (LPARAM)"open");

				}

				break;

			case IDB_TWO:

				SendMessage((HWND)lParam, WM_SETTEXT, (WPARAM)NULL, (LPARAM)"close");

				break;

			case IDB_THREE:

				SendMessage((HWND)lParam, WM_SETTEXT, (WPARAM)NULL, (LPARAM)"send");

				break;

			default:

				break;

			}

		}

	case WM_DESTROY:

		PostQuitMessage(0);

		return(0);

	}

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

}

------解决思路----------------------
create返回缺省窗口过程，不要返回0
------解决思路----------------------

case WM_COMMAND:

		{

			switch(LOWORD(wParam))

			{//按钮事件

			case IDB_ONE:

				{

				char sztext[4];

				HWND hwndEdit1 = ::GetDlgItem(hwnd,IDC_FOUR);

				GetWindowText(hwndEdit1,sztext,4);

				MessageBox(NULL,sztext,"caution",MB_OK
------解决思路----------------------
MB_ICONINFORMATION);

				//SendMessage((HWND)lParam, WM_SETTEXT, (WPARAM)NULL, (LPARAM)"open");

				}

				break;

			case IDB_TWO:

				SendMessage((HWND)lParam, WM_SETTEXT, (WPARAM)NULL, (LPARAM)"close");

				break;

			case IDB_THREE:

				SendMessage((HWND)lParam, WM_SETTEXT, (WPARAM)NULL, (LPARAM)"send");

				break;

			default:

				break;

			}

		}

	case WM_DESTROY:

		PostQuitMessage(0);

		return(0);

这里有问题吧，switch(LOWORD(wParam))处理完按钮事件后，你用了一个break;
break;跳出的是这个switch(LOWORD(wParam))，并没有跳出switch(message)
于是执行了
case WM_DESTROY:
        PostQuitMessage(0);
        return(0);

多打断点，多调试，这类问题很容易发现