请问为什么我调用MessageBox后看不到弹出对话框,按ALT键就出来了 代码如下!

Question

#include <windows.h>
#include <stdio.h>
LRESULT CALLBACK WndProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam);
int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nShowCmd)
{
WNDCLASS wndclass;
wndclass.style         = CS_HREDRAW | CS_VREDRAW; 
wndclass.cbWndExtra    = 0;
wndclass.cbClsExtra    = 0;
wndclass.hIcon         = LoadIcon(NULL,IDI_APPLICATION);
    wndclass.hCursor       = LoadCursor(NULL,IDC_ARROW);
wndclass.hInstance     = hInstance;
wndclass.lpszMenuName  = NULL;
wndclass.lpszClassName = "HCT";
wndclass.lpfnWndProc   = WndProc;
wndclass.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);
HWND hwnd;
RegisterClass(&wndclass);
hwnd = CreateWindow("HCT","HCT-0063",
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
NULL,
NULL,
hInstance,
NULL);
ShowWindow (hwnd,SW_SHOWNORMAL);
      UpdateWindow(hwnd);
MSG msg;
while(GetMessage(&msg,NULL,0,0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return 0;
}
LRESULT CALLBACK WndProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam)
{
switch(message)
{
case WM_CREATE:
//MessageBox(hwnd,TEXT("确实要退出?"),TEXT("退出!"),MB_YESNO)
break;
case WM_PAINT:
break;
case WM_RBUTTONDOWN:
MessageBox(hwnd,"你击了右键!","提示!",MB_OK);
break;
case WM_LBUTTONDOWN:
HDC hdc;
hdc=GetDC(hwnd);
TextOut(hdc,300,300,TEXT("VC++ 6.0"),strlen("VC++ 6.0"));
ReleaseDC(hwnd,hdc);
case WM_CLOSE:
//if(IDYES==MessageBox(hwnd,TEXT("确实要退出?"),TEXT("退出!"),MB_YESNO))
//{
     DestroyWindow(hwnd);
//}
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hwnd,message,wParam,lParam);
}
return 0;
}

Answer 1

ShowWindow(hwnd, SW_SHOW);改成这样试试。

Answer 2

实际测试了一下，可以
屏蔽掉
//case WM_PAINT: 
//break; 
也可以
LRESULT CALLBACK WndProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam) 
{ 
  PAINTSTRUCT ps;
switch(message) 
{ case WM_PAINT: 
BeginPaint(hwnd, &ps);
EndPaint(hwnd, &ps);
break;

Answer 3

谢谢,再问一下,为什么放不出音乐?
case WM_CREATE:
PlaySound ("c:\\2.wma",NULL,SND_ASYNC | SND_FILENAME);
break;