GDI leak problem

Question

I noticed, using the task manager, that the following code has a GDI leak in it. The number of GDI objects in the process of executing this code increases by 1 each time it is executed, but I can not find the problem.

Any help would be appreciated.

// create new DC based on current    
HDC hDC = CreateCompatibleDC(GetDC());
// select a bitmap into the new DC and keep the old one
HGDIOBJ hOldObj = SelectObject (hDC,hBM);
// do somthing here --> 100% no leak here
SomeFunction (hDC);
// select the old object back from whence it came and delete whats returned   
DeleteObject (SelectObject (hDC,hOldObj));
// delete the DC
DeleteDC(hDC);
// delete the tmp object
DeleteObject (hOldObj);

RM

Answer 1

Copying from a comment, I did not answer this as I can’t check, and I was not sure if this is correct, please test it.

In general, it's nice to have nested calls, i.e.

HDC hDC1 = GetDC(); 
HDC hDC2 = CreateCompatibleDC(hDC1); 
.. 

instead

HDC hDC = CreateCompatibleDC(GetDC()); 

(By the way, in your code, the HDC returned by GetDC is not released.)

Answer 2

Make sure you call ReleaseDCnot DeleteDCon the descriptors returned from GetDC.

Answer 3

deleaker .

Answer 4

( , , - xhantt)

, DCC, GetDC() , .

Answer 5

, . -, GDI.

MFC , GDI, CDC CMemoryDC .. , .

Answer 6

. GetDC() .

Answer 7

hOldObj

DeleteObject (hOldObj);