Here I captured all the GUI images that running on the desktop, including the GUI that running on the virtual desktop that is created via "task view" under WIN 10.
Please note that the GUI that is in minimize status cannot be captured in this method. Also, the Internet Explorer cannot be captured with this method.
#include <gdiplus.h> using namespace Gdiplus; GdiplusStartupInput gdiplusStartupInput; ULONG_PTR gdiplusToken; BOOL CvirtualDesktopDlg::OnInitDialog() { CDialogEx::OnInitDialog(); // Set the icon for this dialog. The framework does this automatically // when the application‘s main window is not a dialog SetIcon(m_hIcon, TRUE); // Set big icon SetIcon(m_hIcon, FALSE); // Set small icon // TODO: Add extra initialization here GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL); std::ofstream mylog("mylog.log"); CWnd* pDesktopWnd = CWnd::GetDesktopWindow(); CWnd* pWnd = pDesktopWnd->GetWindow(GW_CHILD); int jpgnum = 0; while (pWnd != NULL) { mylog << "number:" << jpgnum << endl; CString strClassName = _T(" "); ::GetClassName(pWnd->GetSafeHwnd(), strClassName.GetBuffer(256), 256); mylog << "class name\t:" << (CT2A)(LPCTSTR) strClassName << endl; CString strWindowText = _T(" "); ::GetWindowText(pWnd->GetSafeHwnd(), strWindowText.GetBuffer(256), 256); mylog << "window text\t:" << (CT2A)(LPCTSTR)strWindowText << endl; char jpgfilename[1024]; sprintf_s(jpgfilename, "jpg_%d.jpg", jpgnum++); //jpgfilename.Format(_T("jpg_%d"), jpgnum++); USES_CONVERSION; saveDesktoptoJPG(A2T(jpgfilename), pWnd->m_hWnd); pWnd = pWnd->GetWindow(GW_HWNDNEXT); } mylog.close(); return TRUE; // return TRUE unless you set the focus to a control } void CvirtualDesktopDlg::saveDesktoptoJPG(TCHAR *jpgFilePathName, HWND hwnd) { //Get desktop DC /* HWND hDeskWnd = ::GetDesktopWindow(); CDC *pDestDC = CDC::FromHandle(::GetDC(hDeskWnd)); */ CDC *pDestDC = CDC::FromHandle(::GetDC(hwnd) ); int screenWidth = pDestDC->GetDeviceCaps(HORZRES); int screenHeight = pDestDC->GetDeviceCaps(VERTRES); //Create Bitmap that is comatible with desktop CBitmap memBitmap; memBitmap.CreateCompatibleBitmap(pDestDC, screenWidth, screenHeight); //create memory DC for desktop CDC memDC; memDC.CreateCompatibleDC(pDestDC); memDC.SelectObject(&memBitmap); //copy desktop DC to the memery DC memDC.BitBlt(0, 0, screenWidth, screenHeight, pDestDC, 0, 0, SRCCOPY); //obtain the bitmap information BITMAP bmpInfo; memBitmap.GetBitmap(&bmpInfo); //generate BITMAPINFO BITMAPINFO m_BITMAPINFO; memset(&m_BITMAPINFO, 0, sizeof(BITMAPINFO)); m_BITMAPINFO.bmiHeader.biSize = sizeof(BITMAPINFO); m_BITMAPINFO.bmiHeader.biPlanes = 1; m_BITMAPINFO.bmiHeader.biBitCount = bmpInfo.bmBitsPixel; m_BITMAPINFO.bmiHeader.biCompression = BI_RGB; m_BITMAPINFO.bmiHeader.biWidth = bmpInfo.bmWidth; m_BITMAPINFO.bmiHeader.biHeight = bmpInfo.bmHeight; //get the data of bitmap BYTE* pBuffer = new BYTE[bmpInfo.bmWidthBytes*bmpInfo.bmHeight]; GetDIBits(memDC.m_hDC, (HBITMAP)memBitmap.m_hObject, 0, screenHeight, pBuffer, (LPBITMAPINFO)&m_BITMAPINFO, DIB_RGB_COLORS); //generate bitmap Bitmap *pSrcBmp = Bitmap::FromBITMAPINFO(&m_BITMAPINFO, (void*)pBuffer); //save to jpg CLSID encoderClsid; GetEncoderClsid(L"image/jpeg", &encoderClsid); // pSrcBmp->Save(L"D:\\desktop.jpg", &encoderClsid); pSrcBmp->Save(jpgFilePathName, &encoderClsid); delete pSrcBmp; delete pBuffer; ReleaseDC(pDestDC); } int CvirtualDesktopDlg::GetEncoderClsid(const WCHAR* format, CLSID* pClsid) { /* The preceding code produces the following output: image/bmp image/jpeg image/gif image/x-emf image/x-wmf image/tiff image/png image/x-icon */ UINT num = 0; // number of image decoders UINT size = 0; // size, in bytes, of the image decoder array ImageCodecInfo* pImageCodecInfo = NULL; // How many decoders are there? // How big (in bytes) is the array of all ImageCodecInfo objects? GetImageEncodersSize(&num, &size); if (size == 0) { return -1; } // Create a buffer large enough to hold the array of ImageCodecInfo // objects that will be returned by GetImageDecoders. pImageCodecInfo = (ImageCodecInfo*)(malloc(size)); if (pImageCodecInfo == NULL) { return -1; } // GetImageDecoders creates an array of ImageCodecInfo objects // and copies that array into a previously allocated buffer. // The third argument, imageCodecInfos, is a pointer to that buffer. GetImageEncoders(num, size, pImageCodecInfo); for (UINT j = 0; j< num; ++j) { if (wcscmp(pImageCodecInfo[j].MimeType, format) == 0) { *pClsid = pImageCodecInfo[j].Clsid; free(pImageCodecInfo); return j; //success } } free(pImageCodecInfo); return -1; //failure }
Rusult:
file: <mylog.log>
number:0
class name :MSCTFIME UI
window text :MSCTFIME UI
number:1
class name :IME
window text :Default IME
number:2
class name :MSCTFIME UI
window text :MSCTFIME UI
number:3
class name :IME
window text :Default IME
number:4
class name :ForegroundStaging
window text :
number:5
class name :ForegroundStaging
window text :
number:6
class name :TaskListThumbnailWnd
window text :
number:7
class name :tooltips_class32
window text :
number:8
class name :tooltips_class32
window text :