MFC 诊断问题答案

【问题标题】：problem with MFC DiagnosticsMFC 诊断问题
【发布时间】：2009-12-06 20:01:44
【问题描述】：

所以我放弃了实现我自己的内存泄漏跟踪（在这个问题overloading new and delete 中）并尝试使用 MFC 函数来识别我的内存泄漏。所以我完全按照这里的描述做：

http://msdn.microsoft.com/en-us/library/8ky2wh64(VS.80).aspx

这是我的代码：

#ifdef _DEBUG
    CMemoryState oldMemState, newMemState, diffMemState;
    oldMemState.Checkpoint();
#endif

    int* test = new int;

#ifdef _DEBUG
    newMemState.Checkpoint();
    if( diffMemState.Difference( oldMemState, newMemState ) )
    {
        TRACE( "Memory leaked!\n" );
        diffMemState.DumpStatistics();
        diffMemState.DumpAllObjectsSince();
    }
#endif

但不是输出任何有用的信息，而是输出显示

    Memory leaked!
        0 bytes in 0 Free Blocks.
        4 bytes in 1 Normal Blocks.
        0 bytes in 0 CRT Blocks.
        0 bytes in 0 Ignore Blocks.
        0 bytes in 0 Client Blocks.
        Largest number used: 0 bytes.
        Total allocations: 4 bytes.
        Dumping objects ->
    {714538} normal block at 0x029628C8, 4 bytes long.
Data: <    > CD CD CD CD 
f:\dd\vctools\vc7libs\ship\atlmfc\src\mfc\thrdcore.cpp(306) : {714536} client block at 0x022F6040, subtype c0, 68 bytes long.
  a CWinThread object at $022F6040, 68 bytes long
    {714535} normal block at 0x03B607A8, 4 bytes long.
Data: <@`/ > 40 60 2F 02 
    {714534} normal block at 0x03B58C70, 8 bytes long.
Data: < N      > F0 4E B5 03 00 00 00 00 
    {714533} client block at 0x03B54EF0, subtype c0, 12 bytes long.
    a CEvent object at $03B54EF0, 12 bytes long
    {714524} normal block at 0x022FFFC8, 1 bytes long.
Data: < > CD 
    {714523} normal block at 0x03B608C0, 12 bytes long.
Data: <    x   h   > E8 07 B6 03 78 08 B6 03 68 97 9A 02 
    {714522} normal block at 0x03B60878, 12 bytes long.
Data: <    0   P   > C0 08 B6 03 30 08 B6 03 50 82 9A 02 
    {714521} normal block at 0x03B60830, 12 bytes long.
Data: <x           > 78 08 B6 03 E8 07 B6 03 88 81 9A 02 
    {714520} normal block at 0x03B607E8, 12 bytes long.
Data: <0           > 30 08 B6 03 C0 08 B6 03 CD CD CD CD 
    {714515} normal block at 0x03B606B0, 104 bytes long.
Data: <                > 00 00 00 00 CD CD CD CD CD CD CD CD CD CD CD CD 
    {714510} normal block at 0x03B60668, 12 bytes long.
Data: <            > C8 03 B6 03 20 06 B6 03 88 AC 9A 02 
    {714509} normal block at 0x03B60620, 12 bytes long.
Data: <h       h   > 68 06 B6 03 D8 05 B6 03 68 97 9A 02

.......... 一直在进行，括号中的数字在倒数（实际上我从来没有耐心等待让它倒数到 1）

它总是从这个高数字 714538 开始所以 - 我做错了什么？

谢谢！

【问题讨论】：

我相信高数是行号。
不，根据文档“大多数行开头的大括号中的数字指定分配对象的顺序。最近分配的对象具有最高的数字并出现在顶部垃圾场。”但是在两个检查点之间的堆上只分配了一个 int，所以这么大的数字没有意义

标签： mfc memory-leaks

【解决方案1】：

从here 显示，应该在您调用 Checkpoint() 的 CMemoryState 对象上调用 DumpAllObjectsSince()。

所以你的代码应该是：

    {
            TRACE( "Memory leaked!\n" );
            diffMemState.DumpStatistics();
            //diffMemState.DumpAllObjectsSince();
            oldMemState.DumpAllObjectsSince();
    }

【讨论】：