以下是程式碼.... 我是要將png圖變小張.... 但我一直縮不到,他只是把外框縮小圖沒變小,而且還變白色.... 不知道出了甚麼原因... 謝謝....    void __fastcall TForm1::OpenPNGButtonClick(TObject *Sender) {    if (OpenDialog1->Execute())    {       TCHAR filename[MAX_PATH];       lstrcpyn(filename, OpenDialog1->FileName.c_str(), MAX_PATH);          // declare and clear the PNGD_P2DINFO structure       PNGD_P2DINFO png2dib;            memset(&png2dib, 0, sizeof(PNGD_P2DINFO));          // initialize the structure size and filename            png2dib.structsize = sizeof(PNGD_P2DINFO);            png2dib.pngfn = filename;          // convert from PNG to DIB            if (read_png_to_dib(&png2dib) == PNGD_E_SUCCESS)       {          int x,y;          int n = 0, m = 0, i = 0, j = 0;             Graphics::TBitmap* Bitmap = new Graphics::TBitmap;          Graphics::TBitmap* temp = Image1->Picture->Bitmap;          temp->Width = png2dib.lpdib->biWidth/2;          temp->Height = png2dib.lpdib->biHeight/2;                    for(y = 0; y <= temp->Height; y++) {                 if(y == m){                         for(x = 0; x <= temp->Width; x++) {                                 if(x == n) {                                                           Bitmap->Canvas->Pixels[j][i] = temp->Canvas->Pixels[y][x];                                         n = n + 2;                                         i++;                                 }                         }                         n = 0;                         i = 0;                         j++;                         m = m + 2;                 }             }             HBITMAP hBmp = Bitmap->ReleaseHandle();          HDC hDC = Canvas->Handle;          try          {             //             // TODO: add palette support...             //                // convert from DIB to TBitmap             SetDIBits(                hDC, hBmp, 0,                png2dib.lpdib->biHeight, png2dib.bits,                reinterpret_cast(png2dib.lpdib), DIB_RGB_COLORS ); } catch (...) { Bitmap->Handle = hBmp; GlobalFree(png2dib.lpdib); } Bitmap->Handle = hBmp; GlobalFree(png2dib.lpdib); } } }

您好:    PO程式碼的方式與版規說明請參考下面連結,煩請修改謝謝您的配合 >