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                            ## 繪制背景

當控件開始繪制背景時，觸發該消息。

* * * * *
**參數1(wParam)**：該參數為繪圖畫布句柄。

**參數2(lParam)**：指向繪圖數據結構體(ExsPaintStruct)的指針。

* * * * *
### 返回值

返回1表示本次背景由該消息處理函數繪制，其他則由控件類默認繪制。

* * * * *

### 舉例
~~~
.如果真 (uMsg = #消息_繪制背景)
    '// 處理代碼,繪制背景
    返回(1)
.如果真結束
~~~
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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