SelectObject()函数详解

SelectObject
把一个对象(位图、画笔、画刷等)选入指定的设备描述表。新的对象代替同一类型的老对象。

HGDIOBJ SelectObject(

  HDC hdc,          // handle to DC

  HGDIOBJ hgdiobj   // handle to object

);

参数

1. hdc 设备描述表句柄(要载入的设备描述表句柄)
2. hgdiobj 选择要载入的对象的句柄

但该对象的句柄必须使用以下函数创建才有效：

Bitmap(位图)          CreateBitmap, CreateBitmapIndirect, 
                            CreateCompatibleBitmap, CreateDIBitmap, 
                            CreateDIBSection
Brush(画刷)           CreateBrushIndirect, eateDIBPatternBrush,  
                            CreateDIBPatternBrushPt, CreateHatchBrush,  
                            CreatePatternBrush, CreateSolidBrush 
Font(字体)              CreateFont, CreateFontIndirect

Pen(画笔)               CreatePen, CreatePenIndirect

Region(区域)             CombineRgn, CreateEllipticRgn, 
                               CreateEllipticRgnIndirect, 
                               CreatePolygonRgn, CreateRectRgn, 
                               CreateRectRgnIndirect

返回值：如果选择对象不是区域并且函数执行成功，那么返回值是被取代的对象的句柄；如果选择对象是区域并且函数执行成功，返回如下一值；