Errors in code

[crazy boy]

Edit - this part is Solved:
3rd argument not solved but I see there can be same problem with 1st argument HBitmap. HBitmap is 0.
The function call

PrintWindow(HCapture, device, PW_CLIENTONLY)

does not use Hbitmap, it uses device. So I need to select the bitmap from DC first. So I will get the handle. Correct?

The 3rd argument... i am lost... idk how to solve it

I am translating from original AHK code which uses

obm := SelectObject(hdc, hbm) ; // selected the bitmap first
PrintWindow(hwnd, hdc)  ; // GdipCreateBitmapFromHBITMAP call, they passed uint ... the reason for confusion
pBitmap := Gdip_CreateBitmapFromHBITMAP(hbm)

[crazy boy]

I am pasting actual code without headers:

/*Window capture example*/
#include "stdafx.h"
using namespace Gdiplus;
using namespace Gdiplus::DllExports;
// using namespace GdiPlus; 

#define SCREENWIDTH GetSystemMetrics(SM_CXSCREEN)
#define SCREENHEIGHT GetSystemMetrics(SM_CYSCREEN)

// HBITMAP g_hDeskBmp;
HDC g_hMemDC;
int g_nDCdata;

int main()
{
 // get desktop window handle (but can be handle of any window)
 HWND HCapture = FindWindow(NULL, _T("Map Viewer") );
//	HWND HCapture = GetDesktopWindow();
 if(!IsWindow(HCapture)) return 1;

/*
 BOOL PrintWindow(
  HWND hwnd, // A handle to the window that will be copied.
  HDC hdcBlt, // A handle to the device context.
  UINT nFlags // The drawing options: PW_CLIENTONLY
                        //     Only the client area of the window is copied to hdcBlt. By default, the entire window is copied.
);
*/

 // get window dimensions
 RECT rect;
 GetWindowRect(HCapture, &rect);

 size_t dx = rect.right - rect.left;
 size_t dy = rect.bottom - rect.top;

 // create BITMAPINFO structure
 // used by CreateDIBSection
 BITMAPINFO info;
 info.bmiHeader.biSize          = sizeof(BITMAPINFOHEADER);
 info.bmiHeader.biWidth         = dx;
 info.bmiHeader.biHeight        = dy;
 info.bmiHeader.biPlanes        = 1;
 info.bmiHeader.biBitCount      = 24;
 info.bmiHeader.biCompression   = BI_RGB;
 info.bmiHeader.biSizeImage     = 0;
 info.bmiHeader.biXPelsPerMeter = 0;
 info.bmiHeader.biYPelsPerMeter = 0;
 info.bmiHeader.biClrUsed       = 0;
 info.bmiHeader.biClrImportant  = 0;

 // a bitmap handle and a pointer its bit data
 HBITMAP HBitmap = 0;
 BYTE*   memory = 0;

 /** We should create Bitmap first and then Device Context,
     however when I want to create snapshot of window, I need to use
	 fnc PrintWindow to copy the visual window to Device Context.
	 So I need to create DC first. The DC will be compatible with
	 current screen.
 */
 
 // 1. FIRST we need to Create DC for PrintWindow function
 // HDC HDevice = GetDC(HCapture);
 HDC HDevice = CreateCompatibleDC(NULL);
 
 // 2. SECOND we need to CREATE BITMAP (Device Independent Bitmap)
 // bitmap = CreateDIBSection(HDevice, &info, DIB_RGB_COLORS, (void**)&memory, 0, 0);
 // THIS WAS WRONG DECLARATION: unsigned int * pBitmap;
 GpBitmap *pBitmap = NULL; // type Gdiplus::GpBitmap

  if (!PrintWindow(HCapture, HDevice, PW_CLIENTONLY)) return 2;
  
  SelectObject (HDevice, pBitmap); // hdc, hbm is GpBitmap is hgdiobj

  DllExports::GdipCreateBitmapFromHBITMAP(HBitmap, 0, &pBitmap);
 ReleaseDC(HCapture, HDevice);
 if(!HBitmap || !memory) return 1;

 // blit the contents of the desktop (winDC)
 // to the bitmap (selected in memDC)
 HDC winDC = GetWindowDC(HCapture);
 HDC memDC = CreateCompatibleDC(winDC);
 SelectObject(memDC, HBitmap);
 BitBlt(memDC, 0, 0, dx, dy, winDC, 0, 0, SRCCOPY);
 DeleteDC(memDC);
 ReleaseDC(HCapture, winDC);

 /** THIS IS WRONG! VARIABLE CANNOT POINT TO NOWHERE!*/
 // char *buffer; // First set the type and range and then make pointer:
  char *buffer = new char[50]; // RIGHT DECLARATION
 sprintf(buffer,"capture%d%d.bmp",dx,dy);
 // create bitmap file
 std::basic_ofstream <char> file(buffer, std::ios::binary);
 if(!file) { DeleteObject(HBitmap); return 1; }

 // initialize bitmap file headers
 BITMAPFILEHEADER fileHeader;
 BITMAPINFOHEADER infoHeader;

 fileHeader.bfType      = 0x4d42;
 fileHeader.bfSize      = 0;
 fileHeader.bfReserved1 = 0;
 fileHeader.bfReserved2 = 0;
 fileHeader.bfOffBits   = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);

 infoHeader.biSize          = sizeof(infoHeader);
 infoHeader.biWidth         = dx;
 infoHeader.biHeight        = dy;
 infoHeader.biPlanes        = 1;
 infoHeader.biBitCount      = 24;
 infoHeader.biCompression   = BI_RGB;
 infoHeader.biSizeImage     = 0;
 infoHeader.biXPelsPerMeter = 0;
 infoHeader.biYPelsPerMeter = 0;
 infoHeader.biClrUsed       = 0;
 infoHeader.biClrImportant  = 0;

 // save file headers
 file.write((char*)&fileHeader, sizeof(fileHeader));
 file.write((char*)&infoHeader, sizeof(infoHeader));

 // save 24-bit bitmap data
 int wbytes = (((24*dx + 31) & (~31))/8);
 int tbytes = (((24*dx + 31) & (~31))/8)*dy;
 file.write((char*)memory, tbytes);
 // delete bitmap
 DeleteObject(HBitmap);
 HBitmap = 0;
 memory = 0;
return 0;
//......................................................................................
}

------ Rebuild All started: Project: capture3, Configuration: Debug Win32 ------
stdafx.cpp
capture.cpp
capture\capture.cpp(92): warning C4996: 'sprintf': This function or variable may be unsafe. Consider using sprintf_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
\visual studio 10.0\vc\include\stdio.h(371) : see declaration of 'sprintf'
Generating Code...
capture.obj : error LNK2019: unresolved external symbol _GdipCreateBitmapFromHBITMAP@12 referenced in function _main
capture3\Debug\capture3.exe : fatal error LNK1120: 1 unresolved externals
========== Rebuild All: 0 succeeded, 1 failed, 0 skipped ==========

We passed over the basic errors; now it continued in compilation until unresolved externals. I need to recall how to fix this coz it's quite about 8 months when I solved this problems first time.

Thank you for your help

PS: Is here a way how to display formatted code?

[crazy boy]

Do you know where to get program called `nm'
referenced here http://www.cplusplus.com/forum/general/113904/ ? Could be useful to solve unresolved externals

[VictorN]

capture\capture.cpp(92): warning C4996: 'sprintf': This function or variable may be unsafe. Consider using sprintf_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
\visual studio 10.0\vc\include\stdio.h(371) : see declaration of 'sprintf'

See http://msdn.microsoft.com/en-us/libr...(v=vs.80).aspx

capture.obj : error LNK2019: unresolved external symbol _GdipCreateBitmapFromHBITMAP@12 referenced in function _main
capture3\Debug\capture3.exe : fatal error LNK1120: 1 unresolved externals

Did you add the Gdiplus.lib?

Is here a way how to display formatted code?

Yes! use Code tags

[crazy boy]

Did you add the Gdiplus.lib?

Yes! use Code tags

I mean to highlight syntax in the code block.

Well, thank you. I added it into project configuration into Linker/Input/Additional dependencies. It works now :-) Great relief.