宣告法：
Declare Function CreateCompatibleBitmap Lib "gdi32" Alias "CreateCompatibleBitmap" (ByVal hdc As Long, ByVal nWidth As Long, ByVal nHeight As Long) As Long
用法介紹：建立相容性Bitmap，由於要利用DC貼圖時必須要用到Bitmap，因此我們需要用它來建立。
範例：
Dim BM As Long
BM = CreateCompatibleBitmap(某DC, 0, 0)