当设备环境不再需要时,应该调用ReleaseDC函数将其释放。 GetWindowDC函数:返回hWnd参数所指定的窗口的设备环境。...当不再需要该设备环境时,需要调用ReleaseDC函数释放设备环境。...函数原型:int ReleaseDC(HWND hWnd, HDC hdc); 参数: hWnd:指向要释放的设备上下文环境所在的窗口的句柄。 hDC:指向要释放的设备上下文环境的句柄。...注释:每次调用GetWindowDC和GetDC函数检索公用设备上下文环境之后,应用程序必须调用ReleaseDC函数来释放设备上下文环境。...应用程序不能调用ReleaseDC函数来释放由CreateDC函数创建的设备上下文环境,只能使用DeleteDC函数。
return false; } int nPreMode = ::SetStretchBltMode(newimg.GetDC(), HALFTONE); newimg.ReleaseDC...0, nWidth, nHeight, 0, 0, oldimg.GetWidth(), oldimg.GetHeight()); newimg.ReleaseDC...(); ::SetBrushOrgEx(newimg.GetDC(), 0, 0, NULL); newimg.ReleaseDC(); ::SetStretchBltMode(...newimg.GetDC(), nPreMode); newimg.ReleaseDC(); newimg.Save(strTarget); newimg.Destroy();
没什么卵用,图一乐 代码 use windows_sys::Win32::{ Graphics::Gdi::{BitBlt, GetDC, ReleaseDC, SRCCOPY}, UI...hdc, x, y, SRCCOPY, ); ReleaseDC
THIS.hForm = GetFocus() THIS.hDC = GetDC(THIS.hForm) ENDIF PROCEDURE Destroy IF THIS.hDC 0 = ReleaseDC..., THIS.hDC,; nX-nSrcWidth/2, nY-nSrcHeight/2,; nSrcWidth, nSrcHeight, nMode) = ReleaseDC...DECLARE INTEGER GetDC IN user32 INTEGER hwnd DECLARE INTEGER GetFocus IN user32 DECLARE INTEGER ReleaseDC
mouse_event //模拟鼠标点击 CreateCompatibleBitmap //创建位图 SelectObject BitBlt GetDIBits //取得屏幕图片 DeleteDC ReleaseDC...bit_blt_success as i32 == 0 { //注意释放资源 DeleteDC(h_screen_dc); DeleteDC(mem_dc); ReleaseDC...(h_screen_dc as HWND, mem_dc); ReleaseDC(null_mut(), h_screen_dc); DeleteObject(mem_dc...("1设置图片信息出错,code: {}", e); } //gc DeleteDC(h_screen_dc); DeleteDC(mem_dc); ReleaseDC...(h_screen_dc as HWND, mem_dc); ReleaseDC(null_mut(), h_screen_dc); DeleteObject(mem_dc as HGDIOBJ
static extern IntPtr GetDC(IntPtr hwnd); [DllImport("user32.dll")] static extern Int32 ReleaseDC...y) { IntPtr hdc = GetDC(IntPtr.Zero); uint pixel = GetPixel(hdc, x, y); ReleaseDC
hDIB) { SelectPalette(hDC,hPal,FALSE); ::ReleaseDC(NULL,hDC... { GlobalFree(hDIB); SelectPalette(hDC,hPal,FALSE); ::ReleaseDC... { GlobalFree(hDIB); SelectPalette(hDC,hPal,FALSE); ::ReleaseDC...(NULL,hDC); return NULL; } SelectPalette(hDC,hPal,FALSE); ::ReleaseDC
tm As Timer WITH interval=0 PROCEDURE Init THIS.decl THIS.CreateSource PROCEDURE Destroy = ReleaseDC...SetTextColor(THIS.hMemDC, RGB(80,80,128)) = TextOut(THIS.hMemDC, 0,0, THIS.content, Len(THIS.content)) = ReleaseDC..., THIS.TrgLen, THIS.TrgHeight,; THIS.hMemDC, THIS.SrcOffs, 0, SRCCOPY) IF hTarget 0 = ReleaseDC...GetWindowDC IN user32 INTEGER hwnd DECLARE INTEGER CreateSolidBrush IN gdi32 LONG crColor DECLARE INTEGER ReleaseDC
对每个WM_TIMER消息,调用GetDC函数获取设备环境,然后绘制一个随机矩形,接着调用ReleaseDC函数释放设备环境。...()%256,rand()%256,rand()%256) ); hdc = GetDC(hWnd); FillRect(hdc,&rect,hBrush); ReleaseDC
, strlen(pstr), 40, NULL, NULL, NULL, &ls); // offset = 5, ls = {40,16} ReleaseDC...ret) { if( HDC_SCREEN == hdc){ SelectFont(hdc,of); } ReleaseDC
就是保存或者打开的文件名 hDC = GetDC(hWnd); TextOut(hDC, 200, 50, ofn.lpstrFile, _tcslen(ofn.lpstrFile)); ReleaseDC...cc.rgbResult); SelectObject(hDC, hBrush); FillRect(hDC, &rect, hBrush); DeleteObject(hBrush); ReleaseDC...SetTextColor(hDC, cf.rgbColors); TextOut(hDC, 200, 170, str, _tcslen(str)); DeleteObject(hFont); ReleaseDC
(destDC, HALFTONE); src.StretchBlt(destDC, 0, 0, stretchWidth, stretchHeight); dest.ReleaseDC
ByVal hDC As Long, ByVal nIndex As Long) As Long '释放设备上下文的句柄,以进行整理 Private Declare PtrSafe Function ReleaseDC...'用每英寸72磅除以dpi得出像素的宽度 PointsPerPixel = POINTS_PER_INCH / lDotsPerInch '释放设备上下文, 以进行整理 ReleaseDC
bitmapinfo,sizeof(BITMAPINFO),1,fp); fwrite(buf,bitmapinfo->bmiHeader.biSizeImage,1,fp); fclose(fp); ReleaseDC...hbitmap) { DeleteObject(hbitmap); hbitmap = NULL; ReleaseDC(hwndDlg,ScreenDC); DestroyWindow...BitBlt(MemDC,0,0,iXscreen,iYscreen,ScreenDC,0,0,SRCCOPY); DeleteObject(hbitmap); hbitmap = NULL; ReleaseDC...IDC_BUTTON_CUT); } else { EnableButtons(g_hwndMain,FALSE,1,IDC_BUTTON_CUT); } ReleaseDC
如果是获取的DC.则用ReleaseDc(Dc对象) 来进行删除. 题外话. windows程序中还有一个API.可以获取DC中默认的图形对象....ReleaseDC(hwnd,hdc); //释放Dc system("pause"); return 0; } 运行之后图片.注意不要遮挡计算器. ? ...ReleaseDC(hwnd,hdc); //释放Dc system("pause"); return 0; } 其中新用到的API就是绘制矩形的API.
] static extern IntPtr GetDC(IntPtr hWnd); [DllImport("user32.dll")] static extern int ReleaseDC...IntPtr deskDC = GetDC(IntPtr.Zero); uint colorCode = GetPixel(deskDC, x, y); ReleaseDC
GetDC(hWnd); SelectObject(hDC, GetStockObject(SYSTEM_FIXED_FONT)); GetTextMetrics(hDC, &tm); ReleaseDC...nCaretPosY * nCharHeight,&TEXTMATRIX(nCaretPosX, nCaretPosY), nLineChars - nCaretPosX/nCharWidth); ReleaseDC...nCaretPosX * nCharWidth, nCaretPosY * nCharHeight, &TEXTMATRIX(nCaretPosX, nCaretPosY), 1); ReleaseDC
strFilePath); ::SetStretchBltMode(hDC,HALFTONE); ::SetBrushOrgEx(hDC,1,1,NULL); image.Draw(hDC,m_ViewRect); ReleaseDC
FormStyleAPI.DeleteObject(hBitmap); } FormStyleAPI.ReleaseDC
nHeight&, ByVal hSrcDC& _ , ByVal XSrc&, ByVal YSrc&, ByVal dwRop&) Private Declare PtrSafe Function ReleaseDC...= SetClipboardData(2, hBitmap) Call CloseClipboard End If ' 清理句柄 Call DeleteDC(hDCMem) Call ReleaseDC
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