UINT ThreadProc(LPVOID pParam)中的参数在MFC中怎么用呀

ma100 2004-11-22 11:34:39

如题，另外，什么时候调用AfxEndThread呀，我又不知道什么时候他结束

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双杯献酒 2004-11-23

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如果传递给线程的pParam是CWnd*,
不可以在线程中调用和窗口显示有关的函数。
因为CWnd是线程相关的。

老夏Max 2004-11-23

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UINT ThreadProc(LPVOID pParam)中的参数在MFC中怎么用呀
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可以将创建线程的类的this指针传递进去，例如：
void CPage3::LoadThumbImages()
{
TerminateThread();
m_hThread = (HANDLE)_beginthreadex(NULL,0, LoadThumbNail,(LPVOID)this,0/* CREATE_SUSPENDED*/,&m_dwThreadID);
m_bRunning = TRUE;
}

unsigned __stdcall CPage3::LoadThumbNail(LPVOID lpParam)
{
CPage3* pThumbDlg = (CPage3*)lpParam;
//使用对话框类的变量或者函数
CListCtrl& ListCtrl = pThumbDlg->m_cThumbList;
CImageList* pImgList = &pThumbDlg->m_ImageListThumb;
}

什么时候调用AfxEndThread呀，我又不知道什么时候他结束
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线程函数执行完了，线程就结束了！！

MFC的多线程 1、创建和终止线程　　在MFC程序中创建一个线程，宜调用AfxBeginThread函数。该函数因参数不同而具有两种重载版本，分别对应工作者线程和用户接口（UI）线程。　　工作者线程 CWinThread *AfxBeginThread( 　AFX_THREADPROC pfnThreadProc, //控制函数　LPVOID pParam, //传递给控制函数的参数　int nPriority = THREAD_PRIORITY_NORMAL, //线程的优先级　UINT nStackSize = 0, //线程的堆栈大小　DWORD dwCreateFlags = 0, //线程的创建标志　LPSECURITY_ATTRIBUTES lpSecurityAttrs = NULL //线程的安全属性 ); 　　工作者线程编程较为简单，只需编写线程控制函数和启动线程即可。下面的代码给出了定义一个控制函数和启动它的过程： //线程控制函数 UINT MfcThreadProc(LPVOID lpParam) { 　CExampleClass *lpObject = (CExampleClass*)lpParam; 　if (lpObject == NULL || !lpObject->IsKindof(RUNTIME_CLASS(CExampleClass))) 　　return - 1; //输入参数非法　//线程成功启动　while (1) 　{ 　　...// 　} 　return 0; }

　　1、创建和终止线程　　在MFC程序中创建一个线程，宜调用AfxBeginThread函数。该函数因参数不同而具有两种重载版本，分别对应工作者线程和用户接口（UI）线程。　　工作者线程 CWinThread *AfxBeginThread( 　AFX_THREADPROC pfnThreadProc, //控制函数　LPVOID pParam, //传递给控制函数的参数　int nPriority = THREAD_PRIORITY_NORMAL, //线程的优先级　UINT nStackSize = 0, //线程的堆栈大小　DWORD dwCreateFlags = 0, //线程的创建标志　LPSECURITY_ATTRIBUTES lpSecurityAttrs = NULL //线程的安全属性 ); ....

在多线程编程中，最简单的方法，无非就是利用 AfxBeginThread 来创建一个工作线程，看一下这个函数的说明：代码如下: CWinThread* AFXAPI AfxBeginThread( AFX_THREADPROC pfnThreadProc, LPVOID pParam, int nPriority = THREAD_PRIORITY_NORMAL, UINT nStackSize = 0, DWORD dwCreateFlags = 0, LPSECURITY_ATTRIBUTES lpSecurityAttrs = NULL ); 在这个说明中，除第1和第2两个

仿多线程的效果一般有2种办法：第一种是通过定时器；第二种是启动多线程，不同模式下启动函数不同，mfc与API与WIN32下面注意点也是有区别的！ VC启动一个新线程的三种方法，有需要的朋友可以参考下。第一种AfxBeginThread() 用AfxBeginThread()函数来创建一个新线程来执行任务，工作者线程的AfxBeginThread的原型如下： CWinThread* AfxBeginThread(AFX_THREADPROC pfnThreadProc, 　　LPVOID lParam, 　　int nPriority = THREAD_PRIORITY_NORMAL, 　　UINT nStackSize = 0, 　　DWORD dwCreateFlags = 0, 　　LPSECURITY_ATTRIBUTES lpSecurityAttrs = NULL 　　);//用于创建工作者线程返回值：成功时返回一个指向新线程的线程对象的指针，否则NULL。 pfnThreadProc : 线程的入口函数，声明一定要如下： UINT MyThreadFunction(LPVOID pParam），不能设置为NULL; pParam : 传递入线程的参数，注意它的类型为：LPVOID，所以我们可以传递一个结构体入线程. nPriority : 线程的优先级，一般设置为 0 .让它和主线程具有共同的优先级. nStackSize : 指定新创建的线程的栈的大小.如果为 0，新创建的线程具有和主线程一样的大小的栈 dwCreateFlags : 指定创建线程以后，线程有怎么样的标志.可以指定两个值： CREATE_SUSPENDED : 线程创建以后，会处于挂起状态，直到调用：ResumeThread 0 : 创建线程后就开始运行. lpSecurityAttrs : 指向一个 SECURITY_ATTRIBUTES 的结构体，用它来标志新创建线程的安全性.如果为 NULL, 那么新创建的线程就具有和主线程一样的安全性. 如果要在线程内结束线程，可以在线程内调用 AfxEndThread. 一般直接用AfxBeginThread(ThreadProc,this); 示例： UINT myproc(LPVOID lParam){CITTDlg *pWnd = (CITTDlg *)lParam; //将窗口指针赋给无类型指针pWnd->KMeansSegment(); //要执行的函数return 1;}void CITTDlg::KMeansSegment(){// 主要处理函数在这里写}void CITTDlg::OnKMeansSegment() //按钮点击执行{AfxBeginThread(myproc, (LPVOID)this);//启动新的线程} 注意，工作者线程的函数必须是全局函数或静态成员函数，不能是普通的成员函数。第二种CreateThread()函数原型为：HANDLECreateThread( NULL, // 没有安全描述符 0, // 默认线程栈的大小 MyThreadProc, // 线程函数指针，即函数名 (LPVOID)&n, // 传递参数 NULL, // 没有附加属性 NULL // 不需要获得线程号码 ); CreatThread，它返回的是一个句柄；如果不需要再监视线程，则用CloseHandle()关闭线程句柄。线程的函数必须定义为： DWORD WINAPI MyThreadProc(LPVOID pParameter)；下面演示多线程操作控件，点击一个Button然后运行一个线程，将字符串显示在CEdit控件里面；示例： .h头文件struct hS {CString Tmp;CTestDlg *hWnd; };//定义全局结构体，用来传递自定义消息DWORD WINAPI ThreadProc(LPVOIDlpParam);//线程函数声明，全局函数public: CString chtmp； struct hS *hTmp;protected: HANDLE m_hThread;//线程句柄 CEdit m_Edit；.cpp实现文件//线程执行函数DWORD WINAPI ThreadProc(LPVOID lpParam){//在这里写处理函数struct hS *Tmp2;Tmp2 = (hS*)lpParam;// 操作： Tmp2->hWnd->m_Edit.SetWindowText( (LPTSTR)Tmp2->Tmp );}void CTestDlg::OnBnClickedButton1(){ hTmp->Tmp = chtmp; hTmp->hWnd = this;//关键是把this指针传进去 m_hThread =CreateThread(NULL,0,ThreadProc,hTmp,0,NULL);//创建新线程 CloseHandle(m_hThread );} 用CreateThread（）函数创建线程将返回一个线程句柄，通过该句柄你可以控制和操作该线程，当你不用时可以一创建该线程后就关闭该句柄，有专门的函CloseHandle()。关闭句柄不代表关闭线程，只是你不能在外部控制该线程（比如，提前结束，更改优先级等）。在线程结束后，系统将自动清理线程资源，但并不自动关闭该句柄，所以线程结束后要记得关闭该句柄。第三种_beginthread() 函数原型为：intptr_t _beginthread( void( *start_address )( void * ), //指向新线程调用的函数的起始地址 unsigned stack_size, //堆栈大小，设置0为系统默认值 void *arglist //传递给线程函数的参数，没有则为NULL ); 返回值：假如成功，函数将会返回一个新线程的句柄，用户可以像这样声明一个句柄变量存储返回值：　　HANDLE hStdOut = _beginthread( CheckKey, 0, NULL )。如果失败_beginthread将返回-1。所在库文件： #include 线程函数的定义：对于_beginthread()创建的线程，其线程函数定义为： void ThreadPro(void * pArguments ); _beginthreadex()为_beginthread()的升级版。总结：AfxBeginThread是MFC的全局函数，是对CreateThread的封装。 CreateThread是Win32 API函数，AfxBeginThread最终要调到CreateThread。而_beginthread是C的运行库函数。

/****************************************************************************************/ /* Compiler.cpp */ /* */ /* Author: Jim Mischel */ /* Description: Dialog and thread code for compiling maps with gbsplib */ /* */ /* The contents of this file are subject to the Genesis3D Public License */ /* Version 1.01 (the "License"); you may not use this file except in */ /* compliance with the License. You may obtain a copy of the License at */ /* http://www.genesis3d.com */ /* */ /* Software distributed under the License is distributed on an "AS IS" */ /* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See */ /* the License for the specific language governing rights and limitations */ /* under the License. */ /* */ /* The Original Code is Genesis3D, released March 25, 1999. */ /* Copyright (C) 1996-1999 Eclipse Entertainment, L.L.C. All Rights Reserved */ /* */ /****************************************************************************************/ #include "stdafx.h" #include "compiler.h" #pragma warning(disable : 4201 4214 4115 4514 4711) #include #include #pragma warning(default : 4201 4214 4115) #include #include #include #include "filepath.h" #include "consoletab.h" // for ConPrintf (yes, it's ugly) #include "util.h" static CWinThread *CompilerThread = NULL; static HWND hwndThreadParent = NULL; static geBoolean ThreadActive = GE_FALSE; static HINSTANCE GBSPHandle = NULL; static GBSP_FuncHook *GlobalFHook; static ofstream *CompileLog; CompilerErrorEnum Compiler_RunPreview ( char const *PreviewFilename, char const *MotionFilename, char const *GPreviewPath ) { assert (ThreadActive == GE_FALSE); char DestBspName[_MAX_PATH]; { // Verify the .BSP file exists... if (_access (PreviewFilename, 0) != 0) { return COMPILER_ERROR_NOBSP; } } // we're going to copy the preview file to the "levels" subdirectory // of the GPreviewPath directory... // // So, if the PreviewFilename is "C:\MyStuff\MyLevel.bsp", // and GPreviewPath is "C:\Editor\GPreview.exe", then the resulting // file name is "C:\Editor\levels\MyLevel.bsp" // { /* char PreviewDrive[_MAX_PATH]; char PreviewDir[_MAX_PATH]; char Name[_MAX_PATH]; char Ext[_MAX_PATH]; _splitpath (PreviewFilename, NULL, NULL, Name, Ext); _splitpath (GPreviewPath, PreviewDrive, PreviewDir, NULL, NULL); strcat (PreviewDir, "media\\levels\\"); _makepath (DestBspName, PreviewDrive, PreviewDir, Name, Ext); */ // make dest path same as source path strcpy(DestBspName, PreviewFilename); } // if source and destination are the same, then don't copy... if (stricmp (DestBspName, PreviewFilename) != 0) { if(!CopyFile (PreviewFilename, DestBspName, FALSE)) { int LastError; LastError = GetLastError(); if (LastError != ERROR_FILE_EXISTS) { ConPrintf("GPreviewPath: %s \n", GPreviewPath); ConPrintf("CopyFile (%s, %s)\nGetLastError()==%d\n", PreviewFilename, DestBspName, LastError); return COMPILER_ERROR_BSPCOPY; } } } { // copy the motion file if it exists char DestName[_MAX_PATH]; // check to see if the file exists FilePath_SetExt (DestBspName, ".mot", DestName); if (_access (MotionFilename, 0) == 0) // _access returns 0 on success...of course! { if (stricmp (MotionFilename, DestName) != 0) { if (!CopyFile (MotionFilename, DestName, FALSE)) { if(GetLastError() != ERROR_FILE_EXISTS) { ConPrintf ("%s", "Unable to copy the motion file.\n"); ConPrintf ("%s", "Continuing with preview.\n"); } } } } else { _unlink (DestName); } } { SHELLEXECUTEINFO shx; char Params[_MAX_PATH]; char DefaultDir[_MAX_PATH]; char NoExtName[_MAX_PATH]; FilePath_GetDriveAndDir (GPreviewPath, DefaultDir); FilePath_GetName (DestBspName, NoExtName); sprintf (Params, "-map %s", NoExtName); shx.fMask = 0; shx.hwnd = NULL; //(HWND)AfxGetMainWnd(); shx.lpVerb = NULL; shx.lpFile = GPreviewPath; shx.lpParameters= Params; shx.lpDirectory = DefaultDir; shx.nShow = SW_NORMAL; shx.hInstApp = NULL; shx.cbSize = sizeof(shx); ShellExecuteEx(&shx;); } return COMPILER_ERROR_NONE; } geBoolean Compiler_CancelCompile ( void ) { if (!ThreadActive) { return GE_FALSE; } return GlobalFHook->GBSP_Cancel (); } static CompilerErrorEnum Compiler_LoadCompilerDLL ( GBSP_FuncHook **ppFHook, HINSTANCE *pHandle, ERROR_CB ErrorCallbackFcn, PRINTF_CB PrintfCallbackFcn ) { GBSP_INIT *GBSP_Init; GBSP_Hook Hook; GBSP_FuncHook *FHook; assert (ppFHook != NULL); assert (pHandle != NULL); *ppFHook = NULL; Hook.Error = ErrorCallbackFcn; Hook.Printf = PrintfCallbackFcn; GBSPHandle = LoadLibrary("gbsplib.dll"); if (GBSPHandle == NULL) { PrintfCallbackFcn ("Compile Failed: Unable to load gbsplib.dll!\nGetLastError returned %d.\n", GetLastError ()); return COMPILER_ERROR_NODLL; } GBSP_Init =(GBSP_INIT*)GetProcAddress(GBSPHandle, "GBSP_Init"); if (GBSP_Init == NULL) { PrintfCallbackFcn ("%s", "Compile Failed: Couldn't initialize GBSP_Init, GBSPLib.Dll.\n."); FreeLibrary(GBSPHandle); return COMPILER_ERROR_MISSINGFUNC; } FHook = GBSP_Init (&Hook;); if (FHook == NULL) { PrintfCallbackFcn ("%s", "Compile Failed: GBSP_Init returned NULL Hook!, GBSPLib.Dll.\n."); FreeLibrary(GBSPHandle); return COMPILER_ERROR_MISSINGFUNC; } if(FHook->VersionMajor > GBSP_VERSION_MAJOR) { PrintfCallbackFcn ("%s", "Compile Failed: GBSP Version Incompatible, GBSPLib.Dll.\n."); FreeLibrary (GBSPHandle); return COMPILER_ERROR_MISSINGFUNC; } *ppFHook = FHook; *pHandle = GBSPHandle; return COMPILER_ERROR_NONE; } CompilerErrorEnum Compiler_Compile ( CompileParamsType const *pParams, ERROR_CB ErrorCallbackFcn, PRINTF_CB PrintfCallbackFcn ) { HINSTANCE GBSPHandle; CompilerErrorEnum CompileRslt; GBSP_RETVAL GbspRslt; char BspFilename[_MAX_PATH]; char MotionFilename[_MAX_PATH]; // load compiler DLL CompileRslt = Compiler_LoadCompilerDLL (&GlobalFHook;, &GBSPHandle;, ErrorCallbackFcn, PrintfCallbackFcn); if (CompileRslt == COMPILER_ERROR_NONE) { FilePath_SetExt (pParams->Filename, ".bsp", BspFilename); FilePath_SetExt (pParams->Filename, ".mot", MotionFilename); if (pParams->EntitiesOnly) { #if 1 #pragma message ("Should UpdateEntities return a GBSP_RETVAL?") if (GlobalFHook->GBSP_UpdateEntities ((char *)pParams->Filename, BspFilename)) { GbspRslt = GBSP_OK; } else { GbspRslt = GBSP_ERROR; } #else GbspRslt = GlobalFHook->GBSP_UpdateEntities ((char *)pParams->Filename, BspFilename); #endif switch (GbspRslt) { case GBSP_ERROR: PrintfCallbackFcn ("%s", "Compile Failed: GBSP_UpdateEntities returned an error. GBSPLib.Dll.\n"); CompileRslt = COMPILER_ERROR_BSPFAIL; break; case GBSP_OK : break; case GBSP_CANCEL : PrintfCallbackFcn ("%s", "UpdateEntities cancelled by user.\n"); CompileRslt = COMPILER_ERROR_USERCANCEL; break; default : assert (0); } } else if (pParams->RunBsp) { _unlink (MotionFilename); // gotta make sure this doesn't exist... GbspRslt = GlobalFHook->GBSP_CreateBSP ((char *)pParams->Filename, (BspParms *)&pParams;->Bsp); switch (GbspRslt) { case GBSP_ERROR : PrintfCallbackFcn ("%s", "Compile Failed: GBSP_CreateBSP encountered an error, GBSPLib.Dll.\n."); CompileRslt = COMPILER_ERROR_BSPFAIL; break; case GBSP_OK : //save as a bsp GbspRslt = GlobalFHook->GBSP_SaveGBSPFile(BspFilename); switch (GbspRslt) { case GBSP_ERROR : PrintfCallbackFcn ("Compile Failed: GBSP_SaveGBSPFile for file: %s, GBSPLib.Dll.\n.", BspFilename); CompileRslt = COMPILER_ERROR_BSPSAVE; break; case GBSP_CANCEL : PrintfCallbackFcn ("%s", "Save cancelled by user\n"); CompileRslt = COMPILER_ERROR_USERCANCEL; break; case GBSP_OK : break; default : assert (0); } break; case GBSP_CANCEL : PrintfCallbackFcn ("%s", "Compile cancelled by user\n"); CompileRslt = COMPILER_ERROR_USERCANCEL; break; default : assert (0); //?? } GlobalFHook->GBSP_FreeBSP(); } } if (CompileRslt == COMPILER_ERROR_NONE) { if(pParams->DoVis && !pParams->EntitiesOnly) { GbspRslt = GlobalFHook->GBSP_VisGBSPFile ((char *)BspFilename, (VisParms *)&pParams;->Vis); switch (GbspRslt) { case GBSP_ERROR : PrintfCallbackFcn ("Warning: GBSP_VisGBSPFile failed for file: %s, GBSPLib.Dll.\n.", BspFilename); break; case GBSP_CANCEL : PrintfCallbackFcn ("%s", "GBSP_VisGBPSFile cancelled by user\n"); CompileRslt = COMPILER_ERROR_USERCANCEL; break; case GBSP_OK : break; default : assert (0); } } } if (CompileRslt == COMPILER_ERROR_NONE) { if (pParams->DoLight) { /* The compiler has no flag that tells it not to do min lighting. So, if the min lighting flag is not on, we set the MinLight vector to all 0s. */ LightParms rad; rad = pParams->Light; if (!pParams->UseMinLight) { geVec3d_Set (&rad;.MinLight, 0.0f, 0.0f, 0.0f); } // If UseMinLight isn't on, then don't pass GbspRslt = GlobalFHook->GBSP_LightGBSPFile(BspFilename, &rad;); switch (GbspRslt) { case GBSP_ERROR : PrintfCallbackFcn ("Warning: GBSP_LightGBSPFile failed for file: %s, GBSPLib.Dll.\n", BspFilename); break; case GBSP_CANCEL : PrintfCallbackFcn ("%s", "GBSP_LightGBSPFile cancelled by user\n"); CompileRslt = COMPILER_ERROR_USERCANCEL; break; case GBSP_OK : break; default : assert (0); } } } // and free the DLL... if (GBSPHandle != NULL) { FreeLibrary (GBSPHandle); } return CompileRslt; } static void Compiler_NotifyApp ( char const *buf, int MsgId ) { #if 1 char *errmsg; errmsg = Util_Strdup (buf); if (errmsg != NULL) { ::PostMessage (hwndThreadParent, MsgId, COMPILER_PROCESSID, (LPARAM)errmsg); } #else ConPrintf ("%s", buf); #endif } static void Compiler_PrintfCallback ( char *format, ... ) { va_list argptr; char buf[32768]; //this is ... cautious va_start (argptr, format); vsprintf (buf, format, argptr); va_end (argptr); if (CompileLog) (*CompileLog) << buf; Compiler_NotifyApp (buf, WM_USER_COMPILE_MSG); } static void Compiler_ErrorCallback ( char *format, ... ) { va_list argptr; char buf[32768]; //this is ... cautious va_start (argptr, format); vsprintf (buf, format, argptr); va_end (argptr); if (CompileLog) (*CompileLog) << buf; Compiler_NotifyApp (buf, WM_USER_COMPILE_ERR); } static UINT Compiler_ThreadProc ( void *pParam ) { CompileParamsType CompileParams; CompilerErrorEnum CompileRslt; assert (pParam != NULL); assert (ThreadActive == GE_FALSE); ThreadActive = GE_TRUE; CompileParams = *((CompileParamsType *)pParam); char LogFilename[_MAX_PATH]; FilePath_SetExt(CompileParams.Filename, ".log", LogFilename); CompileLog = new ofstream(LogFilename, ofstream::out | ofstream::trunc); CompileRslt = Compiler_Compile (&CompileParams;, Compiler_ErrorCallback, Compiler_PrintfCallback); if (CompileRslt == COMPILER_ERROR_NONE) { Compiler_PrintfCallback ("%s", "------------------------------\n"); Compiler_PrintfCallback ("%s", "Compile successfully completed\n"); } if (CompileLog) { (*CompileLog).close(); delete CompileLog; } // notify parent that the compile has completed ::PostMessage (hwndThreadParent, WM_USER_COMPILE_DONE, COMPILER_PROCESSID, (LPARAM)CompileRslt); ThreadActive = GE_FALSE; return 0; } CompilerErrorEnum Compiler_StartThreadedCompile ( CompileParamsType const *pParams, HWND hwndNotify ) { CWinThread *Thread; assert (ThreadActive == GE_FALSE); hwndThreadParent = hwndNotify; Thread = AfxBeginThread ( Compiler_ThreadProc, // AFX_THREADPROC pfnThreadProc, (LPVOID)pParams, // LPVOID pParam, THREAD_PRIORITY_NORMAL, // int nPriority = THREAD_PRIORITY_NORMAL, 0, // UINT nStackSize = 0, 0, // DWORD dwCreateFlags = 0, NULL // LPSECURITY_ATTRIBUTES lpSecurityAttrs = NULL ); if (Thread != NULL) { CompilerThread = Thread; return COMPILER_ERROR_NONE; } else { return COMPILER_ERROR_THREAD; // couldn't spawn the thread } } geBoolean Compiler_CompileInProgress ( void ) { return ThreadActive; }

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