How to use _CrtDumpMemoryLeaks()

问题:

I am trying to use _CrtDumpMemoryLeaks() to display memory leaks in my programs.

But it does not display anything except for returning 0 in case of no memory leaks and 1 in case there is a leak.

The link here shows the output should be like:

Detected memory leaks!
Dumping objects ->
D:\VisualC++\CodeGuru\MemoryLeak\MemoryLeak.cpp(67) : {60} 
normal block at 0x00324818, 4 bytes long.
Data: <,   > 2C 00 00 00 
Object dump complete.

Can anyone suggest the correct way of using this function.

回答1:

Download the sample from the following link. You have to set the following parameters to direct output to console.

   // Send all reports to STDOUT
   _CrtSetReportMode( _CRT_WARN, _CRTDBG_MODE_FILE );
   _CrtSetReportFile( _CRT_WARN, _CRTDBG_FILE_STDOUT );
   _CrtSetReportMode( _CRT_ERROR, _CRTDBG_MODE_FILE );
   _CrtSetReportFile( _CRT_ERROR, _CRTDBG_FILE_STDOUT );
   _CrtSetReportMode( _CRT_ASSERT, _CRTDBG_MODE_FILE );
   _CrtSetReportFile( _CRT_ASSERT, _CRTDBG_FILE_STDOUT );

回答2:

After searching why it not work in my code I find the follow points:

• If there is no detected leak then this method print nothing.
• Not all allocation method are affected. For example CoTaskMemAlloc are not affected.
• The warning must be enabled with _CrtSetReportMode and _CrtSetReportFile.