引言: 如何讓 Panel1 抓到真確的底圖呢?

wsxcv123 你好: 請問？你說的意思是像這個樣子嗎？ < class="code"> HDC dc; Graphics::TBitmap *bmp=new Graphics::TBitmap; TCanvas *canvas=new TCanvas; dc=GetDC(Panel1->Handle); canvas->Handle=dc; bmp->Width=Panel1->ClientWidth; bmp->Height=Panel1->ClientHeight; bmp->Canvas->CopyRect(Rect(0, 0, bmp->Width, bmp->Height), canvas, Panel1->ClientRect); bmp->SaveToFile("Panel1.bmp"); delete canvas; ReleaseDC(NULL, dc); delete bmp; -- Enjoy Researching & Developing --

引言: 我想讓 panel1 當按了某個button Panel1 的 background color 為 一半是 panel2 的 color, 另一半是 form 的 color. Panel1 的位子如果變，安了 button 就再重抓 background color

wsxcv123 你好: 那麼，試試看改成這個樣子行不行呢？ < class="code"> HDC hDC; TCanvas *canvas=new TCanvas; hDC=GetDC(Panel1->Handle); canvas->Handle=hDC; TRect rect; rect.Left=Panel1->Left; rect.Top=Panel1->Top; rect.Right=rect.Left+Panel1->Width; rect.Bottom=rect.Top+Panel1->Height; Graphics::TBitmap *bmp=new Graphics::TBitmap; bmp->Width=Panel1->Width; bmp->Height=Panel1->Height; Panel1->Hide(); Application->ProcessMessages(); bmp->Canvas->CopyRect(Rect(0, 0, bmp->Width, bmp->Height), this->Canvas, rect); Panel1->Show(); Application->ProcessMessages(); canvas->CopyRect(Rect(0, 0, Panel1->Width, Panel1->Height), bmp->Canvas, Rect(0, 0, bmp->Width, bmp->Height)); delete canvas; ReleaseDC(NULL, hDC); delete bmp; -- Enjoy Researching & Developing -- 發表人 - RaynorPao 於 2004/12/29 00:49:34

引言: 執行後，沒什ㄇ變說 底圖還是沒變 < face="Verdana, Arial, Helvetica"> 開一個新 form，加上兩個 Panel 和一個 TImage，一個 Button ，在 ButtonClick 事件中加上

  Graphics::TBitmap *TempBMP = new Graphics::TBitmap ;
  Panel2->Visible = false ;
  
  TRect SourceRect = TRect(Panel2->Left , Panel2->Top
                           ,Panel2->Left   Panel2->Width ,Panel2->Top   Panel2->Height );      TRect DestRect = TRect(0, 0,Panel2->Width,Panel2->Height );      TempBMP->Width = Panel2->Width ;
  TempBMP->Height = Panel2->Height ;
  Image1->Picture->Assign(TempBMP) ;
  Image1->Canvas->CopyRect(DestRect , Canvas ,SourceRect);
  Panel2->Visible = true ;
  delete TempBMP ;    

把 TImage 擺在 Panel2 裡面，就可以驗證執行結果了 如果要更精確一點的抓圖，就用包大人的 GetDC 來畫吧 發表人 - xfile 於 2005/02/02 17:38:26