c – 如何在Windows上检测QtCreator中的内存泄漏？

如何在 Windows上检测QtCreator中的内存泄漏？在文档中,他们建议使用Memcheck,但它只适用于Mac和 Linux.任何Windows的建议？

解决方法

所以经过很多尝试,我终于找到了一种方法来检测Windows上Qt项目的内存泄漏：

1)首先,它不能直接在Qt Creator中完成,因此您需要创建一个Visual C项目来进行内存泄漏检测.幸运的是,qmake使这很容易.打开Qt SDK命令行工具并运行：

qmake -spec win32-msvc2008 -tp vc

这将将您的项目转换为.vcproj.

2)打开此项目并添加内存泄漏检测所需的代码：

到你的main.cpp文件：

// Necessary includes and defines for memory leak detection:
#ifdef _MSC_VER
#define _CRTDBG_MAP_ALLOC
#include <crtdbg.h>
#endif // _MSC_VER


#if defined(_MSC_VER)

// Code to display the memory leak report
// We use a custom report hook to filter out Qt's own memory leaks
// Credit to Andreas Schmidts - http://www.schmidt-web-berlin.de/winfig/blog/?p=154

_CRT_REPORT_HOOK prevHook;

int customreportHook(int /* reportType */,char* message,int* /* returnValue */) {
  // This function is called several times for each memory leak.
  // Each time a part of the error message is supplied.
  // This holds number of subsequent detail messages after
  // a leak was reported
  const int numFollowupDebugMsgParts = 2;
  static bool ignoreMessage = false;
  static int debugMsgPartsCount = 0;

  // check if the memory leak reporting starts
  if ((strncmp(message,"Detected memory leaks!\n",10) == 0)
    || ignoreMessage)
  {
    // check if the memory leak reporting ends
    if (strncmp(message,"Object dump complete.\n",10) == 0)
    {
      _CrtSetReportHook(prevHook);
      ignoreMessage = false;
    } else
      ignoreMessage = true;

    // something from our own code?
    if(strstr(message,".cpp") == NULL)
    {
      if(debugMsgPartsCount++ < numFollowupDebugMsgParts)
        // give it back to _CrtDbgReport() to be printed to the console
        return FALSE;
      else
        return TRUE;  // ignore it
    } else
    {
      debugMsgPartsCount = 0;
      // give it back to _CrtDbgReport() to be printed to the console
      return FALSE;
    }
  } else
    // give it back to _CrtDbgReport() to be printed to the console
    return FALSE;
}

#endif



int main(int argc,char *argv[]) {
    #if defined(_MSC_VER)
    _CrtSetDbgFlag(_CRTDBG_ALLOC_MEM_DF | _CRTDBG_LEAK_CHECK_DF);
    prevHook = _CrtSetReportHook(customreportHook);
    // _CrtSetBreakAlloc(157); // Use this line to break at the nth memory allocation
    #endif

    QApplication* app = new QApplication(argc,argv);   
    int appError = app->exec();
    delete app;

    #if defined(_MSC_VER)
    // Once the app has finished running and has been deleted,// we run this command to view the memory leaks:
    _CrtDumpMemoryLeaks();
    #endif 

    return appError;
}

3)为此,您的项目现在应该能够检测内存泄漏.注意_MSC_VER定义,以便只有当您从Visual C(而不是来自Qt Creator)运行此代码时才执行此代码.这意味着您仍然可以使用Qt Creator进行开发,只要您需要检查内存泄漏,就重新运行步骤1.

4)要打破特定的内存分配,请使用_CrtSetBreakAlloc()更多信息Microsoft网站上的内存泄漏检测：http://msdn.microsoft.com/en-us/library/e5ewb1h3%28v=vs.80%29.aspx