CMemoryState主要功能是什么

CMemoryState主要功能是什么...急..........

使用CMemoryState检测内存泄漏 CMemoryState是Visual C++提供的内存检测类，主要用于检测程序中的内存泄漏。CMemoryState具有以下成员函数：CMemoryState::Checkpoint() 设置检测点 CMemoryState::Difference() 比较两个CMemoryState对象 CMemoryState::DumpAllObjectsSince() dump检测点以后所有的对象 CMemoryState::DumpStatistics() 打印内存统计信息 CMemoryState::Checkpoint() 设置检测点 CMemoryState::Difference() 比较两个CMemoryState对象 CMemoryState::DumpAllObjectsSince() dump检测点以后所有的对象 CMemoryState::DumpStatistics() 打印内存统计信息使用CMemoryState检测内存泄漏的步骤很简单，先准备两个对象分别在程序的首尾位置设置检测点，然后调用Difference()得出它们的差异，并将差异打印出来，程序员即可得知程序中内存泄漏的程度。以下是使用CMemoryState的例子，注意观察：查看源代码 拷贝至剪贴板 打印代码void foo() { CMemoryState ms1, ms2, ms3, msd; ms1.Checkpoint(); int *ip = new int [100]; ms2.Checkpoint(); delete [] ip; ms3.Checkpoint(); msd.Difference( ms1, ms2); msd.DumpStatistics(); //未释放内存 TRACE("\r\n"); msd.Difference( ms1, ms3); msd.DumpStatistics(); //已释放内存 } void foo() { CMemoryState ms1, ms2, ms3, msd; ms1.Checkpoint(); int *ip = new int [100]; ms2.Checkpoint(); delete [] ip; ms3.Checkpoint(); msd.Difference( ms1, ms2); msd.DumpStatistics(); //未释放内存 TRACE("\r\n"); msd.Difference( ms1, ms3); msd.DumpStatistics(); //已释放内存 } 其Debug结果如下：0 bytes in 0 Free Blocks. 400 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: 400 bytes. Total allocations: 400 bytes. 0 bytes in 0 Free Blocks. 0 bytes in 0 Normal Blocks. 0 bytes in 0 CRT Blocks. 0 bytes in 0 Ignore Blocks. 0 bytes in 0 Client Blocks. Largest number used: 400 bytes. Total allocations: 400 bytes. 0 bytes in 0 Free Blocks. 400 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: 400 bytes. Total allocations: 400 bytes. 0 bytes in 0 Free Blocks. 0 bytes in 0 Normal Blocks. 0 bytes in 0 CRT Blocks. 0 bytes in 0 Ignore Blocks. 0 bytes in 0 Client Blocks. Largest number used: 400 bytes. Total allocations: 400 bytes.可以从输出数据发现，在delete [] p释放内存之前，系统存在内存泄漏（泄漏值为400 bytes），在释放之后，内存泄漏消失了。使用CMemoryState，可以有效地检测到程序中的内存泄漏。

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