Re: CBitmap to IPIcture.... How?

"Giovanni Dicanio" <>
Sat, 2 Feb 2008 12:00:04 +0100
"Jessica" <> ha scritto nel messaggio

I am having a CBitMap object, and I need to create an IPicture object from
it. The code which I 've written for that is shown below. Can anyone tell
whether or not it's correct?

HBITMAP hBmp = (HBITMAP) bmp; // bmp is CBitmap object.
HRESULT hrCreated = E_FAIL;
IPicture* pIPict = NULL;
PICTDESC pictdesc;

pictdesc.bmp.hbitmap = hBmp;
pictdesc.picType = PICTYPE_BITMAP;
pictdesc.cbSizeofstruct = sizeof (PICTDESC);

I would clear pictdesc memory before setting the fields, something like

  ::ZeroMemory( &pictdesc, sizeof(pictdesc) );

then, as you wrote:

  pictdesc.cbSizeOfstruct = ...

hrCreated = OleCreatePictureIndirect(&pictdesc,

Did you check the return value?
Something like this:

  if ( FAILED( hrCreated ) )
   ... error in OleLoadPictureIndirect

I tried to save the IPicute using the IPictureDisp interface, but the bmp
file created is 0 bytes. Am I missing something here?

You should check the HRESULT return value.
Moreover, did you use IPicture::SaveAsFile to save your bitmap into file?

Moreover, for image management, you may consider interesting to see also the
GDI+ API. It offers also C++ interface to manipulate and load/save images.


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