How to release an object created from GdipCreateBitmapFromHBITMAP?

I'm writing a C application and in my code I'm calling the constructor GdipCreateBitmapFromHBITMAP.

I know the constructor should not be called from C, but I used a "hack" from here "How can I take a screenshot and save it as JPEG on Windows?"

I'm not sure how to release resources that were allocated during the call to GdipCreateBitmapFromHBITMAP.

I tried finding help in the documentation but found nothing.

ULONG *pBitmap = NULL; lGdipCreateBitmapFromHBITMAP = (pGdipCreateBitmapFromHBITMAP)GetProcAddress(hModuleThread, "GdipCreateBitmapFromHBITMAP"); lGdipCreateBitmapFromHBITMAP(hBmp, NULL, &pBitmap);

How to I release pBitmap?

Thanks a lot.

-------------Problems Reply------------

What you are doing is not a "hack". Although GDI+ is primarily designed to be used in C++, it does expose a flat API for use in C. Your code is using that API. GdipCreateBitmapFromHBITMAP() is not a constructor, it is a flat C function that is called by the Bitmap.Bitmap(HBITMAP, HPALETTE) constructor.

That being said, GdipCreateBitmapFromHBITMAP() returns a pointer to a GpBitmap object (which is wrapped by the Bitmap class in C++). GdipDisposeImage() is the correct way to release that object (which is called by the Image destructor in C++).

struct GpImage {};
struct GpBitmap {};
typedef GpStatus (WINGDIPAPI *pGdipCreateBitmapFromHBITMAP)(HBITMAP, HPALETTE hpal, GpBitmap**);
typedef GpStatus (WINGDIPAPI *GdipDisposeImage)(GpImage *image);

GpBitmap *pBitmap = NULL;
lGdipCreateBitmapFromHBITMAP = (pGdipCreateBitmapFromHBITMAP) GetProcAddress(hModuleThread, "GdipCreateBitmapFromHBITMAP");
lGdipDisposeImage = (pGdipDisposeImage) GetProcAddress(hModuleThread, "GdipDisposeImage");
//...
lGdipCreateBitmapFromHBITMAP(hBmp, NULL, &pBitmap);
//...
lGdipDisposeImage((GpImage*)pBitmap);

Category:c# Views:3 Time:2018-04-13

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