I am lucky to find this nice forum. I am beginner in C++ and I am getting error in my program to capture content of Window. Any help?

h
Qt Code: 
  1. #include "targetver.h"
  2. #include <stdio.h>
  3. #include <tchar.h>
  4. #include <windows.h>
  5. #include <fstream>
  6. #include <stdio.h>
  7. #include <wingdi.h>
  8. #include <gdiplus.h>
  9. #include <ostream>
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cpp
Qt Code: 
  1. /*Window capture example*/
  2. //using namespace Gdiplus;
  3.  
  4. #include "stdafx.h"
  5. #define SCREENWIDTH GetSystemMetrics(SM_CXSCREEN)
  6. #define SCREENHEIGHT GetSystemMetrics(SM_CYSCREEN)
  7.  
  8. // HBITMAP g_hDeskBmp;
  9. HDC g_hMemDC;
  10. int g_nDCdata;
  11.  
  12. int main()
  13. {
  14.  // get desktop window handle (but can be handle of any window)
  15.  HWND HCapture = FindWindow(NULL, _T("Map Viewer") );
  16. //	HWND HCapture = GetDesktopWindow();
  17.  if(!IsWindow(HCapture)) return 1;
  18.  
  19. /*
  20.  BOOL PrintWindow(
  21.   HWND hwnd, // A handle to the window that will be copied.
  22.   HDC hdcBlt, // A handle to the device context.
  23.   UINT nFlags // The drawing options: PW_CLIENTONLY
  24.                         //     Only the client area of the window is copied to hdcBlt. By default, the entire window is copied.
  25. );
  26. */
  27.  
  28.  // get window dimensions
  29.  RECT rect;
  30.  GetWindowRect(HCapture, &rect);
  31.  
  32.  size_t dx = rect.right - rect.left;
  33.  size_t dy = rect.bottom - rect.top;
  34.  
  35.  // create BITMAPINFO structure
  36.  // used by CreateDIBSection
  37.  BITMAPINFO info;
  38.  info.bmiHeader.biSize          = sizeof(BITMAPINFOHEADER);
  39.  info.bmiHeader.biWidth         = dx;
  40.  info.bmiHeader.biHeight        = dy;
  41.  info.bmiHeader.biPlanes        = 1;
  42.  info.bmiHeader.biBitCount      = 24;
  43.  info.bmiHeader.biCompression   = BI_RGB;
  44.  info.bmiHeader.biSizeImage     = 0;
  45.  info.bmiHeader.biXPelsPerMeter = 0;
  46.  info.bmiHeader.biYPelsPerMeter = 0;
  47.  info.bmiHeader.biClrUsed       = 0;
  48.  info.bmiHeader.biClrImportant  = 0;
  49.  
  50.  // a bitmap handle and a pointer its bit data
  51.  HBITMAP HBitmap = 0;
  52.  BYTE*   memory = 0;
  53.  
  54.  /** We should create Bitmap first and then Device Context,
  55.      however when I want to create snapshot of window, I need to use
  56. 	 fnc PrintWindow to copy the visual window to Device Context.
  57. 	 So I need to create DC first. The DC will be compatible with
  58. 	 current screen.
  59.  */
  60.  
  61.  // 1. FIRST we need to Create DC for PrintWindow function
  62.  // HDC device = GetDC(HCapture);
  63.  HDC device = CreateCompatibleDC(NULL);
  64.  
  65.  // 2. SECOND we need to CREATE BITMAP (Device Independent Bitmap)
  66.  // bitmap = CreateDIBSection(device, &info, DIB_RGB_COLORS, (void**)&memory, 0, 0);
  67.  unsigned int * pBitmap;
  68.  
  69.  if (!PrintWindow(HCapture, device, PW_CLIENTONLY)) return 2;
  70.  HBitmap = GdipCreateBitmapFromHBITMAP(HBitmap, 0, pBitmap);
  71.  ReleaseDC(HCapture, device);
  72.  if(!HBitmap || !memory) return 1;
  73.  
  74.  // blit the contents of the desktop (winDC)
  75.  // to the bitmap (selected in memDC)
  76.  HDC winDC = GetWindowDC(HCapture);
  77.  HDC memDC = CreateCompatibleDC(winDC);
  78.  SelectObject(memDC, HBitmap);
  79.  BitBlt(memDC, 0, 0, dx, dy, winDC, 0, 0, SRCCOPY);
  80.  DeleteDC(memDC);
  81.  ReleaseDC(HCapture, winDC);
  82.  
  83.  /** THIS IS WRONG! VARIABLE CANNOT POINT TO NOWHERE!*/
  84.  // char *buffer; // First set the type and range and then make pointer:
  85.   char *buffer = new char[50]; // RIGHT DECLARATION
  86.  sprintf(buffer,"capture%d%d.bmp",dx,dy);
  87.  // create bitmap file
  88.  std::basic_ofstream <char> file(buffer, std::ios::binary);
  89.  if(!file) { DeleteObject(HBitmap); return 1; }
  90.  
  91.  // initialize bitmap file headers
  92.  BITMAPFILEHEADER fileHeader;
  93.  BITMAPINFOHEADER infoHeader;
  94.  
  95.  fileHeader.bfType      = 0x4d42;
  96.  fileHeader.bfSize      = 0;
  97.  fileHeader.bfReserved1 = 0;
  98.  fileHeader.bfReserved2 = 0;
  99.  fileHeader.bfOffBits   = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);
  100.  
  101.  infoHeader.biSize          = sizeof(infoHeader);
  102.  infoHeader.biWidth         = dx;
  103.  infoHeader.biHeight        = dy;
  104.  infoHeader.biPlanes        = 1;
  105.  infoHeader.biBitCount      = 24;
  106.  infoHeader.biCompression   = BI_RGB;
  107.  infoHeader.biSizeImage     = 0;
  108.  infoHeader.biXPelsPerMeter = 0;
  109.  infoHeader.biYPelsPerMeter = 0;
  110.  infoHeader.biClrUsed       = 0;
  111.  infoHeader.biClrImportant  = 0;
  112.  
  113.  // save file headers
  114.  file.write((char*)&fileHeader, sizeof(fileHeader));
  115.  file.write((char*)&infoHeader, sizeof(infoHeader));
  116.  
  117.  // save 24-bit bitmap data
  118.  int wbytes = (((24*dx + 31) & (~31))/8);
  119.  int tbytes = (((24*dx + 31) & (~31))/8)*dy;
  120.  file.write((char*)memory, tbytes);
  121.  // delete bitmap
  122.  DeleteObject(HBitmap);
  123.  HBitmap = 0;
  124.  memory = 0;
  125. return 0;
  126. //......................................................................................
  127. }
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Error:
error C3861: 'GdipCreateBitmapFromHBITMAP': identifier not found