Qt 在VS中内存泄露 检查

Qt在VS中的内存泄露检测

分类： C++ QT 随想&&感想 2010-11-23 20:56 938人阅读 评论(2) 收藏 举报

 今天在QT_VP中简单地添加了内存泄露检测语句：

_CrtSetDbgFlag ( _CRTDBG_ALLOC_MEM_DF | _CRTDBG_LEAK_CHECK_DF );

结果出来一大堆的内存泄露，着实吓了一跳，跟踪了一天，逐段派出，最后还是感觉没问题（还是比较自信代码质量的O(∩_∩)O哈哈~）。。。最后上网一查，在vs中，先是进行内存泄露报告，然后才卸载Qt的dll，释放申请的资源。所以才会出现这种情况。

 

标志内存检测报告：setdebugnew.h

注意，只有在cpp中添加setdebugnew.h，而且有new操作的那些函数或者类被调用，才会进行内存泄露跟踪

#ifndef SET_DEBUG_NEW_H
#define SET_DEBUG_NEW_H

#ifdef _DEBUG
    #define DEBUG_CLIENTBLOCK   new( _CLIENT_BLOCK, __FILE__, __LINE__)
#else
    #define DEBUG_CLIENTBLOCK
#endif

#define _CRTDBG_MAP_ALLOC
#include

#ifdef _DEBUG
    #define new DEBUG_CLIENTBLOCK
#endif

#endif

在cpp中添加该头文件以后，内存泄露报告格式：

./mainwindow.cpp(530) : {24737} client block at 0x00C12420, subtype 0, 8 bytes long.
./mainwindow.cpp(367) : {6653} client block at 0x00B59E68, subtype 0, 8 bytes long.

 然后在main函数中添加一个内存报告过滤器，将不是"*.cpp"格式的报告过滤掉，即可~

 

过滤器头文件reportinghook.h:

#pragma once

#if defined(WIN32)
void setFilterDebugHook(void);
#endif

 reportinghook.cpp:

#if defined(WIN32)

#include
#include "crtdbg.h"

#define FALSE   0
#define TRUE    1

_CRT_REPORT_HOOK prevHook;

int reportingHook(int reportType, char* userMessage, int* retVal)
{
    // 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(userMessage,"Detected memory leaks!/n", 10) == 0)
        || ignoreMessage)
    {
        // check if the memory leak reporting ends
        if (strncmp(userMessage,"Object dump complete./n", 10) == 0)
        {
            _CrtSetReportHook(prevHook);
            ignoreMessage = false;
        } else
            ignoreMessage = true;

        // something from our own code?
        if(strstr(userMessage, ".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;
};

void setFilterDebugHook(void)
{
    //change the report function to only report memory leaks from program code
    prevHook = _CrtSetReportHook(reportingHook);
}

#endif

测试程序：

#include "setdebugnew.h"

#include "reportingHook.h"

int main(int argv, char *args[])
{
    _CrtSetDbgFlag ( _CRTDBG_ALLOC_MEM_DF | _CRTDBG_LEAK_CHECK_DF );
    QApplication app(argv, args);

    MainWindow* mainWindow = new MainWindow;
    mainWindow->setGeometry(30, 30, 1024, 768);
    mainWindow->show();

    app.connect( &app, SIGNAL(lastWindowClosed()), &app, SLOT(quit()) );

    int result = app.exec();

#if defined(WIN32) && defined(_DEBUG)
    setFilterDebugHook();
#endif

    return result ;
}