CBitmap为什么转化成HBITMAP呢????

Question

CBitmap BitmapObj;
BitmapObj.LoadBitmap(IDB_BITMAP2);
HBITMAP hOldBitmap = (HBITMAP)::SelectObject(hMemDC,(HBITMAP)BitmapObj);

Answer 1

可以直接载入,而不需要用到CBitmap
HBITMAP hBitmap=LoadBitmap(NULL,IDB_BITMAP2);

Answer 2

HBITMAP bmp=LoadBitmap(m_hInst,MAKEINTRESOURCE(IDB_NI_HAO));

Answer 3

HGDIOBJ SelectObject(
  _In_  HDC hdc,
  _In_  HGDIOBJ hgdiobj
);符合参数类型！

Answer 4

hgdiobj [in]
A handle to the object to be selected. The specified object must have been created by using one of the following functions.
Object Functions
Bitmap
CreateBitmap, CreateBitmapIndirect, CreateCompatibleBitmap, CreateDIBitmap, CreateDIBSection
Bitmaps can only be selected into memory DC's. A single bitmap cannot be selected into more than one DC at the same time.
Brush
CreateBrushIndirect, CreateDIBPatternBrush, CreateDIBPatternBrushPt, CreateHatchBrush, CreatePatternBrush, CreateSolidBrush
Font
CreateFont, CreateFontIndirect
Pen
CreatePen, CreatePenIndirect
Region
Com

Answer 5

CBitmap::operator HBITMAP
=============
你上面用得没错啊！

Answer 6

因为CBitmap类重载了HBITMAP类型
operator HBITMAP 
 Returns the Windows handle attached to the CBitmap object. 
 

Answer 7

,(HBITMAP)BitmapObj); 
也可以：
,BitmapObj.m_Object);