HOWTO: Obtain Width and Height of a CBitmap Object

• The Microsoft Foundation Classes (MFC), used with:
  • Microsoft C/C++ for MS-DOS, version 7.0
  • Microsoft Visual C++ for Windows, 16-bit edition, versions 1.0, 1.5
  • Microsoft Visual C++, 32-bit Editions, versions 1.0, 2.0, 2.1, 4.0

SUMMARY

The CBitmap class provided by Microsoft Foundation Classes (MFC), does not contain member functions that return the width and height of a bitmap.

MORE INFORMATION

The width and height of a CBitmap may be obtained by using the member function GetObject(). GetObject() can return a BITMAP structure that contains both the height and the width of the bitmap, along with some additional information.

The sample code below illustrates two functions that accept a CBitmap reference and return the width and height contained in the BITMAP structure returned by GetObject().

Sample Code

   int GetCBitmapWidth(const CBitmap & cbm)
   {
      BITMAP bm;
      cbm.GetObject(sizeof(BITMAP),&bm);
      return bm.bmWidth;
   }

   int GetCBitmapHeight(const CBitmap & cbm)
   {
      BITMAP bm;
      cbm.GetObject(sizeof(BITMAP),&bm);
      return bm.bmHeight;
   } 

Additional query words:

Keywords : kbBitmap kbGDI kbMFC kbVC100 kbVC150 kbVC200 kbVC400 kbVC500 kbVC600 kbGrpMFCATL
Version : winnt:1.0,2.0,2.1,4.0
Platform : winnt
Issue type : kbhowto