下面这段代码是我看孙鑫老师视频时跟着他敲的。
程序代码:
#include <windows.h>
#include <stdio.h>
LRESULT CALLBACK WidSunProc();
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 = WidSunProc; // 为什么这里有错!
wndcls.lpszClassName = "weixin2003";
wndcls.lpszMenuName = NULL;
wndcls.style = CS_HREDRAW | CS_VREDRAW;
RegisterClass(&wndcls);
HWND hwnd;
hwnd = CreateWindow("weixin2003", "北京维新技术培训中心", WS_OVERLAPPEDWINDOW,
0, 0, 600, 800, 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 WidSunProc(
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, "weixin", 0);
break;
case WM_LBUTTONDOWN:
MessageBox(hwnd, "Mouse Clicked!", "weixin", 0);
HDC hdc;
hdc = GetDC(hwnd);
TextOut(hdc, 0, 50, "计算机编程语言培训", strlen("计算机编程语言培训"));
ReleaseDC(hwnd, hdc);
break;
case WM_PAINT:
PAINTSTRUCT ps;
hdc = BeginPaint(hwnd, &ps);
TextOut(hdc, 0, 0, " 维新培训", strlen("维新培训"));
EndPaint(hwnd, &ps);
break;
case WM_CLOSE:
if(IDYES == MessageBox(hwnd, "是否真的结束?", "weixin", MB_YESNO))
{
DestroyWindow(hwnd);
}
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hwnd, uMsg, wParam, lParam);
}
return 0;
}
这是他敲代码的视频截图:
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回调函数孙鑫老师都取名为:WidSunProc.
他敲完后能运行,但是我编译就有一处错误,貌似我和他的代码没不同啊。
具体错误是 D:\C语言教程\lesson1\Windows\WinMain.cpp(22) : error C2440: '=' : cannot convert from 'long (__stdcall *)(void)' to 'long (__stdcall *)(struct HWND__ *,unsigned int,unsigned int,long)'
This conversion requires a reinterpret_cast, a C-style cast or function-style cast
什么原因?
我把WinSunProc全改成WndProc也一样.
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本帖最后由 有容就大 于 2012-2-15 21:35 编辑 ]