error C2440: “=”: 无法从“va_list”转换为“const char [22]”

天地一扁舟 2012-10-25 01:17:50

error C2440: “=”: 无法从“va_list”转换为“const char [22]”
请问这个错误应该怎么改正

...全文

92 3 打赏收藏转发到动态举报

写回复

3 条回复

切换为时间正序

请发表友善的回复…

发表回复

开发者说 2012-10-26

打赏
举报

回复

va_arg(arg, char *)

圆圆胖胖的车车 2012-10-26

打赏
举报

回复

贴代码吧。可能是类型不匹配。

proorck6 2012-10-25

打赏
举报

回复

把源代码贴出来，va_list是什么，不知道。

开源的My sql连接接口，用C++,OrzMySQL::OrzMySQL() : m_impl(new OrzMySQLImpl) { } OrzMySQL::~OrzMySQL() { if (m_impl) { delete m_impl; } } DBId OrzMySQL::getId() const { return m_impl->getId(); } bool OrzMySQL::initialize(DBId _dbId, const Params& _params) { return m_impl->initialize(_dbId, _params); } bool OrzMySQL::boost() { return m_impl->boost(); } void OrzMySQL::shutdown() { m_impl->shutdown(); } QRWrap OrzMySQL::query(const char* _str, uint32 _len, ...) { QRWrap qrw; if (_str == 0) { sLogger->out(OL_ERROR, __FILE__, " - [", d2s(__LINE__).c_str(), "]: ", " _str == 0!", 0); return qrw; } va_list arg_ptr; va_start(arg_ptr, _len); DBQueryDataShrPtr dbq = allocDBQyd(); if (_len == 0) _len = strlen(_str); dbq->dbQstr.append(_str, _len); dbq->hasHdr = false; while (1) { char* str = 0; str = va_arg(arg_ptr, char*); if (!str) break; uint32 len = 0; len = va_arg(arg_ptr, uint32); if (len == 0) len = strlen(str); dbq->dbQstr.append(str, len); } va_end(arg_ptr); return m_impl->query(dbq); }

/****************************************************************************************/ /* 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; }

PyTorch版的YOLOv5是高性能的实时目标检测方法。Jetson Nano是英伟达含有GPU的人工智能硬件。本课程讲述如何部署YOLOv5在Jetson Nano开发板上。部署完成后可进行图像、视频文件和摄像头视频的实时目标检测。...

经过本人测试，可以调用并成功执行ffmpeg的命令 jni相关的c语言代码为 #include #include #include #ifdef ANDROID #include #include #define LOGE(format, ...) __android_log_print(ANDROID_LOG_ERROR, "(>__<) " format "\n", ##__VA_ARGS__) #define LOGI(format, ...) LOGE("(^_^) " format "\n", ##__VA_ARGS__) #endif int ffmpegmain(int argc, char **argv); //Output FFmpeg's av_log() void custom_log(void *ptr, int level, const char* fmt, va_list vl){ //To TXT file FILE *fp=fopen("/storage/emulated/0/av_log.txt","a+"); if(fp){ vfprintf(fp,fmt,vl); fflush(fp); fclose(fp); } //To Logcat //LOGE(fmt, vl); } JNIEXPORT jint JNICALL Java_com_rinogame_ffmpegandroidtranscoder_MainActivity_ffmpegcore( JNIEnv * env, jobject thiz, jint cmdnum, jobjectArray cmdline) { //FFmpeg av_log() callback av_log_set_callback(custom_log); int argc=cmdnum; char** argv=(char**)malloc(sizeof(char*)*argc); int i=0; for(i=0;iGetObjectArrayElement(env,cmdline,i); const char* tmp=(*env)->GetStringUTFChars(env,string,0); argv[i]=(char*)malloc(sizeof(char)*1024); strcpy(argv[i],tmp); } ffmpegmain(argc,argv); for(i=0;i

今天遇到一个问题string转char*总是失败提示错误为 error C2440: '=' : cannot convert from 'const char *' to 'char *' 源代码为： string temFile; char* filenamecpy; filenamecpy = temFile.data(); 解决方法 filenamecpy =

16,215

社区成员

26,594

社区内容

发帖

与我相关

我的任务

社区管理员

加入社区

近7日
近30日
至今

加载中

查看更多榜单

社区公告

暂无公告

试试用AI创作助手写篇文章吧

+ 用AI写文章