#include <iostream>
#include <windows.h>

using namespace std;

int main()
{
 // get desktop window (but can be any window)
 HWND capture = GetDesktopWindow();
 if(!IsWindow(capture)) return 1;

 // get window dimensions
 RECT rect;
 GetWindowRect(capture, &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 bitmap = 0;
 BYTE*   memory = 0;

 // create bitmap
 HDC device = GetDC(capture);
 bitmap = CreateDIBSection(device, &info, DIB_RGB_COLORS, (void**)&memory, 0, 0);
 ReleaseDC(capture, device);
 if(!bitmap || !memory) return 1;

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

 char *buffer;
 sprintf(buffer,"capture%d%d.bmp",dx,dy);
 // create bitmap file
 basic_ofstream<char> file(buffer, ios::binary);
 if(!file) { DeleteObject(bitmap); 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(bitmap);
 bitmap = 0;
 memory = 0;
    return 0;
}

In function int main()':| main.cpp|56|error: variablestd::basic_ofstream<char, std::char_traits<char> > file' has initializer but incomplete type|
warning: unused variable 'wbytes'|
||=== Build finished: 1 errors, 1 warnings ===|