Question

VC++编写一个简单的Win32窗口 编译无错误 运行出不了窗口 任务管理器有

代码

#include <WINDOWS.H>
#include <STDIO.H>

LRESULT CALLBACK WinSunProc(
HWND hwnd, // handle to window
UINT uMsg, // message identifier
WPARAM wParam, // first message parameter
LPARAM lParam // second message parameter
);

int WINAPI WinMain(
HINSTANCE hInstance, // handle to current instance
HINSTANCE hPrevInstance, // handle to previous instance
LPSTR lpCmdLine, // command line
int nCmdShow // show state
)
{
WNDCLASS wndcls;
wndcls.cbClsExtra=0;
wndcls.cbWndExtra=0;
wndcls.hbrBackground=(HBRUSH)GetStockObject(BLACK_BRUSH);
wndcls.hCursor=LoadCursor(NULL,IDC_CROSS);
wndcls.hIcon=LoadIcon(NULL,IDI_ERROR);
wndcls.hInstance=hInstance;
wndcls.lpfnWndProc=WinSunProc;
wndcls.lpszClassName="WeiXin2003";
wndcls.lpszMenuName=NULL;
wndcls.style=CS_HREDRAW | CS_VREDRAW;
RegisterClass(&wndcls);

HWND hwnd;
hwnd=CreateWindow("WeiXin2003","北京维新",WS_OVERLAPPEDWINDOW,0,0,600,400,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 WinSunProc(
HWND hwnd, // handle to window
UINT uMsg, // message identifier
WPARAM wParam, // first message parameter
LPARAM lParam // second message parameter
)
{
switch(uMsg)
{
case WM_CHAR:
char szChar[20];
sprintf(szChar,"char is %d",wParam);
MessageBox(hwnd,szChar,"WeiXin2003",0);
break;
case WM_LBUTTONDOWN:
MessageBox(hwnd,"mouse clicked","WeiXin",0);
HDC hdc;
hdc=GetDC(hwnd);
TextOut(hdc,0,50,"22",strlen("22") );
ReleaseDC(hwnd,hdc);
break;
case WM_PAINT:
HDC hDC;
PAINTSTRUCT ps;
hDC=BeginPaint(hwnd,&ps);
TextOut(hDC,0,50,"11",strlen("11") );
EndPaint(hwnd,&ps);
break;
case WM_CLOSE:
if (IDYES==MessageBox(hwnd,"是否真得结束？","WeiXin",MB_YESNO))
{
DestroyWindow(hwnd);
}

break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:DefWindowProc(hwnd,uMsg,wParam,lParam);
}
return 0;
}

Answer 1

DefWindowProc(hwnd,uMsg,wParam,lParam);
改成
return DefWindowProc(hwnd,uMsg,wParam,lParam);
至于为什么错，你就自己分析了