C ++ MFC：从Char *创建CString时内存泄漏

Question

I am getting a memory leak when I run try to read from Clipboard.

Sample code:

void SomeFunction()
{
   OpenClipboard(nullptr);
   HGLOBAL hglb = GetClipboardData(CF_TEXT);
   char* ch = static_cast<char*>(GlobalLock(hglb));

   CString rawClipboardData(ch);

   GlobalUnlock(hglb);
   CloseClipboard();
}

It is the middle row above which causes the memory leak according to Visual Studio. This row:

CString rawClipboardData(ch);

If I do not run it, there is no leak reported. But if I do run it I get the following debug output in visual studio output window:

Detected memory leaks!
Dumping objects ->
f:\dd\vctools\vc7libs\ship\atlmfc\src\strcore.cpp(158) : {75645} normal block at 0x00000000072C89A0, 52 bytes long.
Data: <`x              > 60 78 F7 D3 FE 07 00 00 0D 00 00 00 0D 00 00 00
Object dump complete.

Any ideas?

UPDATE: Added OpenClipboard(nullptr) in code above. Also in real code there are nullptr-checks. Just keeping it clean here to reduce amount of guard-clause code.

Answer 1

GlobalLock(hglb) should be a LPTSTR so I would assume that the leak is caused by the cast to char* . For Unicode platforms, TCHAR is defined as synonymous with the WCHAR type.

you should be able to do something like

CString rawClipboardData = GlobalLock(hglb);

If not then

CString rawClipboardData;
LPTSTR lptstr = GlobalLock(hglb);
rawClipboardData = lptstr;

will definitely work