📄 subject_30106.htm
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序号：30106 发表者：网络猎人 发表日期：2003-02-20 10:49:46
<br>主题：LRESULT CALLBACK 回调老是出现问题
<br>内容：<BR>#include "windows.h"<BR><BR>LRERULT CALLBACK WindowFunc(HWND,UINT,WPARAM,LPARAM);<BR><BR>char szwinName[]="mywin";<BR><BR>int WINAPI WinMain(HINSTANCE hThisInst,HINSTANCE hPrevInst,LPSTR lpszArgs,int nWinMode)<BR>{<BR> HWND hwnd;<BR> MSG msg;<BR> WNDCLASSEX wcl;<BR> wcl.cbSize =sizeof(WNDCLASSEX);//定义窗口类;<BR> wcl.hInstance =hThisInst; //句柄指向本身;<BR> wcl.lpszClassName =szwinName; //窗口名字;<BR> wcl.lpfnWndProc =(long)WindowFunc;<BR> wcl.style =0;//默认风格;<BR> wcl.hIcon =LoadIcon(NULL,IDI_APPLICATION);<BR> wcl.hIconSm =LoadIcon(NULL,IDI_WINLOGO);<BR> wcl.hCursor =LoadCursor(NULL,IDC_ARROW);//载入<BR> wcl.lpszMenuName =NULL;//表示不需要菜单；<BR> wcl.cbClsExtra =0;//不要额外的信息；<BR> wcl.cbWndExtra =0;//同上；<BR><BR><BR> //让窗口的背景为白色；<BR> wcl.hbrBackground =(HBRUSH)GetStockObject(WHITE_BRUSH);<BR><BR> //注册窗口类；//窗口类指的是窗口的样式；<BR> if(!RegisterClassEx(&wcl)) return 0;<BR><BR> //窗口注册完过后就可以创建了；<BR> hwnd=CreateWindow(szwinName,"firstwindow",WS_OVERLAPPEDWINDOW,CW_USEDEFAULT,CW_USEDFAULT,<BR> CW_USEDEFAULT,CW_USEDEFAULT,HWND_DESKTOP,NULL,hThisInst,NULL);<BR><BR> //创建过后就应该显示<BR><BR> ShowWindow(hwnd,nWinMode);<BR> UpdateWindow(hwnd);<BR> <BR> while(GetMessage(&msg,NULL,0,0))<BR> {<BR> TranslateMessage(&msg);<BR> DispatchMessage(&msg);<BR> }<BR> return msg.wParam ;<BR>}<BR><BR>_stdcall LRERULT CALLBACK WindowFunc(HWND hwnd,UINT message,WPARAM wparam,LPARAM lparam)<BR>{<BR> switch(message)<BR> {<BR> case WM_DESTROY:<BR> PostQuitMessage(0);<BR> break;<BR> default:<BR> return DefWindowProc(hwnd,message,wparam,lparam);<BR> }<BR> return 0;<BR>}<BR><BR>老是出现下列错误<BR><BR><BR>D:\Program Files\Microsoft Visual Studio\MyProjects\123\123.cpp(3) : error C2143: syntax error : missing ';' before '__stdcall'<BR>D:\Program Files\Microsoft Visual Studio\MyProjects\123\123.cpp(3) : error C2501: 'LRERULT' : missing storage-class or type specifiers<BR>D:\Program Files\Microsoft Visual Studio\MyProjects\123\123.cpp(15) : error C2440: '=' : cannot convert from 'long' to 'long (__stdcall *)(struct HWND__ *,unsigned int,unsigned int,long)'<BR> Conversion from integral type to pointer type requires reinterpret_cast, C-style cast or function-style cast<BR>D:\Program Files\Microsoft Visual Studio\MyProjects\123\123.cpp(33) : error C2065: 'CW_USEDFAULT' : undeclared identifier<BR>D:\Program Files\Microsoft Visual Studio\MyProjects\123\123.cpp(48) : error C2143: syntax error : missing ';' before '__stdcall'<BR>D:\Program Files\Microsoft Visual Studio\MyProjects\123\123.cpp(48) : warning C4229: anachronism used : modifiers on data are ignored<BR>D:\Program Files\Microsoft Visual Studio\MyProjects\123\123.cpp(48) : error C2501: 'LRERULT' : missing storage-class or type specifiers<BR>D:\Program Files\Microsoft Visual Studio\MyProjects\123\123.cpp(48) : error C2086: 'LRERULT' : redefinition<BR>Error executing cl.exe.<BR><BR>
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<font color=red>答案被接受</font><br>回复者：晚风也渡 回复日期：2003-02-20 13:16:59
<br>内容：改为如下：<BR>#include "windows.h"<BR><BR>LRESULT CALLBACK WindowFunc(HWND,UINT,WPARAM,LPARAM);<BR><BR>char szwinName[]="mywin";<BR><BR>int WINAPI WinMain(HINSTANCE hThisInst,HINSTANCE hPrevInst,LPSTR lpszArgs,int nWinMode)<BR>{<BR> HWND hwnd;<BR> MSG msg;<BR> WNDCLASSEX wcl;<BR> wcl.cbSize =sizeof(WNDCLASSEX);//定义窗口类;<BR> wcl.hInstance =hThisInst; //句柄指向本身;<BR> wcl.lpszClassName =szwinName; //窗口名字;<BR> wcl.lpfnWndProc =(WNDPROC)WindowFunc;<BR> wcl.style =0;//默认风格;<BR> wcl.hIcon =LoadIcon(NULL,IDI_APPLICATION);<BR> wcl.hIconSm =LoadIcon(NULL,IDI_WINLOGO);<BR> wcl.hCursor =LoadCursor(NULL,IDC_ARROW);//载入<BR> wcl.lpszMenuName =NULL;//表示不需要菜单；<BR> wcl.cbClsExtra =0;//不要额外的信息；<BR> wcl.cbWndExtra =0;//同上；<BR><BR><BR> //让窗口的背景为白色；<BR> wcl.hbrBackground =(HBRUSH)GetStockObject(WHITE_BRUSH);<BR><BR> //注册窗口类；//窗口类指的是窗口的样式；<BR> if(!RegisterClassEx(&wcl)) return 0;<BR><BR> //窗口注册完过后就可以创建了；<BR> hwnd=CreateWindow(szwinName,"firstwindow",WS_OVERLAPPEDWINDOW,CW_USEDEFAULT,CW_USEDEFAULT,<BR> CW_USEDEFAULT,CW_USEDEFAULT,HWND_DESKTOP,NULL,hThisInst,NULL);<BR><BR> //创建过后就应该显示<BR><BR> ShowWindow(hwnd,nWinMode);<BR> UpdateWindow(hwnd);<BR> <BR> while(GetMessage(&msg,NULL,0,0))<BR> {<BR> TranslateMessage(&msg);<BR> DispatchMessage(&msg);<BR> }<BR> return msg.wParam ;<BR>}<BR><BR>LRESULT CALLBACK WindowFunc(HWND hwnd,UINT message,WPARAM wparam,LPARAM lparam)<BR>{<BR> switch(message)<BR> {<BR> case WM_DESTROY:<BR> PostQuitMessage(0);<BR> break;<BR> default:<BR> return DefWindowProc(hwnd,message,wparam,lparam);<BR> }<BR> return 0;<BR>}<BR>
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