#include <windows.h>
#include <iostream>
#include <stdio.h>
#include <stdlib.h> 
#include <conio.h>

using namespace std;
PBITMAPINFO CreateBitmapInfoStruct(HWND hwnd, HBITMAP hBmp)
{ 
    BITMAP bmp; 
    PBITMAPINFO pbmi; 
    WORD    cClrBits; 

    // Retrieve the bitmap color format, width, and height. 
    if (!GetObject(hBmp, sizeof(BITMAP), (LPSTR)&bmp)) 
        printf("GetObject", hwnd); 

    // Convert the color format to a count of bits. 
    cClrBits = (WORD)(bmp.bmPlanes * bmp.bmBitsPixel); 
    if (cClrBits == 1) 
        cClrBits = 1; 
    else if (cClrBits <= 4) 
        cClrBits = 4; 
    else if (cClrBits <= 8) 
        cClrBits = 8; 
    else if (cClrBits <= 16) 
        cClrBits = 16; 
    else if (cClrBits <= 24) 
        cClrBits = 24; 
    else cClrBits = 32; 

    // Allocate memory for the BITMAPINFO structure. (This structure 
    // contains a BITMAPINFOHEADER structure and an array of RGBQUAD 
    // data structures.) 

     if (cClrBits != 24) 
         pbmi = (PBITMAPINFO) LocalAlloc(LPTR, 
                    sizeof(BITMAPINFOHEADER) + 
                    sizeof(RGBQUAD) * (1<< cClrBits)); 

     // There is no RGBQUAD array for the 24-bit-per-pixel format. 

     else 
         pbmi = (PBITMAPINFO) LocalAlloc(LPTR, 
                    sizeof(BITMAPINFOHEADER)); 

    // Initialize the fields in the BITMAPINFO structure. 

    pbmi->bmiHeader.biSize = sizeof(BITMAPINFOHEADER); 
    pbmi->bmiHeader.biWidth = bmp.bmWidth; 
    pbmi->bmiHeader.biHeight = bmp.bmHeight; 
    pbmi->bmiHeader.biPlanes = bmp.bmPlanes; 
    pbmi->bmiHeader.biBitCount = bmp.bmBitsPixel; 
    if (cClrBits < 24) 
        pbmi->bmiHeader.biClrUsed = (1<<cClrBits); 

    // If the bitmap is not compressed, set the BI_RGB flag. 
    pbmi->bmiHeader.biCompression = BI_RGB; 

    // Compute the number of bytes in the array of color 
    // indices and store the result in biSizeImage. 
    // For Windows NT, the width must be DWORD aligned unless 
    // the bitmap is RLE compressed. This example shows this. 
    // For Windows 95/98/Me, the width must be WORD aligned unless the 
    // bitmap is RLE compressed.
    pbmi->bmiHeader.biSizeImage = ((pbmi->bmiHeader.biWidth * cClrBits +31) & ~31) /8
                                  * pbmi->bmiHeader.biHeight; 
    // Set biClrImportant to 0, indicating that all of the 
    // device colors are important. 
     pbmi->bmiHeader.biClrImportant = 0; 
     return pbmi; 
 } 
void CreateBMPFile(HWND hwnd, LPTSTR pszFile, PBITMAPINFO pbi,HBITMAP hBMP, HDC hDC) 
 { 
     HANDLE hf;                 // file handle 
    BITMAPFILEHEADER hdr;       // bitmap file-header 
    PBITMAPINFOHEADER pbih;     // bitmap info-header 
    LPBYTE lpBits;              // memory pointer 
    DWORD dwTotal;              // total count of bytes 
    DWORD cb;                   // incremental count of bytes 
    BYTE *hp;                   // byte pointer 
    DWORD dwTmp; 

    pbih = (PBITMAPINFOHEADER) pbi; 
    lpBits = (LPBYTE) GlobalAlloc(GMEM_FIXED, pbih->biSizeImage);

    if (!lpBits) 
         printf("GlobalAlloc", hwnd); 

    // Retrieve the color table (RGBQUAD array) and the bits 
    // (array of palette indices) from the DIB. 
    if (!GetDIBits(hDC, hBMP, 0, (WORD) pbih->biHeight, lpBits, pbi, 
        DIB_RGB_COLORS)) 
    {
        printf("GetDIBits", hwnd); 
    }

    // Create the .BMP file. 
    hf = CreateFile(pszFile, 
                   GENERIC_READ | GENERIC_WRITE, 
                   (DWORD) 0, 
                    NULL, 
                   CREATE_ALWAYS, 
                   FILE_ATTRIBUTE_NORMAL, 
                   (HANDLE) NULL); 
    if (hf == INVALID_HANDLE_VALUE) 
        printf("CreateFile", hwnd); 
    hdr.bfType = 0x4d42;        // 0x42 = "B" 0x4d = "M" 
    // Compute the size of the entire file. 
    hdr.bfSize = (DWORD) (sizeof(BITMAPFILEHEADER) + 
                 pbih->biSize + pbih->biClrUsed 
                 * sizeof(RGBQUAD) + pbih->biSizeImage); 
    hdr.bfReserved1 = 0; 
    hdr.bfReserved2 = 0; 

    // Compute the offset to the array of color indices. 
    hdr.bfOffBits = (DWORD) sizeof(BITMAPFILEHEADER) + 
                    pbih->biSize + pbih->biClrUsed 
                    * sizeof (RGBQUAD); 

    // Copy the BITMAPFILEHEADER into the .BMP file. 
    if (!WriteFile(hf, (LPVOID) &hdr, sizeof(BITMAPFILEHEADER), 
        (LPDWORD) &dwTmp,  NULL)) 
    {
       printf("WriteFile", hwnd); 
    }

    // Copy the BITMAPINFOHEADER and RGBQUAD array into the file. 
    if (!WriteFile(hf, (LPVOID) pbih, sizeof(BITMAPINFOHEADER) 
                  + pbih->biClrUsed * sizeof (RGBQUAD), 
                  (LPDWORD) &dwTmp, ( NULL)))
        printf("WriteFile", hwnd); 

    // Copy the array of color indices into the .BMP file. 
    dwTotal = cb = pbih->biSizeImage; 
    hp = lpBits; 
    if (!WriteFile(hf, (LPSTR) hp, (int) cb, (LPDWORD) &dwTmp,NULL)) 
           printf("WriteFile", hwnd); 

    // Close the .BMP file. 
     if (!CloseHandle(hf)) 
           printf("CloseHandle", hwnd); 

    // Free memory. 
    GlobalFree((HGLOBAL)lpBits);
}
int main()
{
HDC hdcScreen, hdcCompatible,hdc;
HBITMAP hbmScreen;
HWND hwnd = 0;
BITMAP bmp; 
hdcScreen = CreateDC("DISPLAY", NULL, NULL, NULL); 
hdcCompatible = CreateCompatibleDC(hdcScreen); 

// Create a compatible bitmap for hdcScreen. 

hbmScreen = CreateCompatibleBitmap(hdcScreen, 
                     GetDeviceCaps(hdcScreen, HORZRES), 
                     GetDeviceCaps(hdcScreen, VERTRES)); 

if (hbmScreen == 0) 
    printf("hbmScreen", NULL); 

// Select the bitmaps into the compatible DC. 

if (!SelectObject(hdcCompatible, hbmScreen)) 
    printf("Compatible Bitmap Selection", NULL); 

        // Hide the application window. 

        ShowWindow(hwnd, SW_HIDE); 

         //Copy color data for the entire display into a 
         //bitmap that is selected into a compatible DC. 

        if (!BitBlt(hdcCompatible, 
               0,0, 
               bmp.bmWidth, bmp.bmHeight, 
               hdcScreen, 
               0,0, 
               SRCCOPY)) 

        printf("Screen to Compat Blt Failed", hwnd); 

        // Redraw the application window. 

        ShowWindow(hwnd, SW_SHOW); 
SelectObject(hdcCompatible, hbmScreen); // Gerätekontext auswählen
// ShowWindow(hwnd, SW_HIDE); 
BitBlt(hdcCompatible, 0,0, GetSystemMetrics(SM_CXSCREEN),
GetSystemMetrics(SM_CYSCREEN), hdcScreen, 0,0, SRCCOPY); 
//ShowWindow(hwnd, SW_SHOW); 

//CreateBMPFile aus Ms-Internet-Hilfe
hdcScreen = CreateDC("DISPLAY", NULL, NULL, NULL); 
hdcCompatible = CreateCompatibleDC(hdcScreen); 

// Create a compatible bitmap for hdcScreen. 

hbmScreen = CreateCompatibleBitmap(hdcScreen, 
                     GetDeviceCaps(hdcScreen, HORZRES), 
                     GetDeviceCaps(hdcScreen, VERTRES)); 

if (hbmScreen == 0) 
    printf("hbmScreen", hwnd); 

// Select the bitmaps into the compatible DC. 

if (!SelectObject(hdcCompatible, hbmScreen)) 
    printf("Compatible Bitmap Selection", hwnd); 

        // Hide the application window. 

        ShowWindow(hwnd, SW_HIDE); 

         //Copy color data for the entire display into a 
         //bitmap that is selected into a compatible DC. 

        if (!BitBlt(hdcCompatible, 
               0,0, 
               bmp.bmWidth, bmp.bmHeight, 
               hdcScreen, 
               0,0, 
               SRCCOPY)) 

        printf("Screen to Compat Blt Failed", hwnd); 

        // Redraw the application window. 

        ShowWindow(hwnd, SW_SHOW); 
//-- Storing an Image --
//CreateBMPFile(hwnd, "D:\\Screenshot\\TestBild.bmp", ????, hbmScreen, hdc);

BITMAPINFO pbi = 
CreateBitmapInfoStruct(
0, 
hbmScreen); //Error 1: conversion from `tagBITMAPINFO*' to non-scalar type `tagBITMAPINFO' requested 
CreateBMPFile(NULL, "C:\\Screenshot\\TestBild.bmp", pbi, hbmScreen, hdc); //Error 2: cannot convert `BITMAPINFO' to `tagBITMAPINFO*' for argument `3' to `void CreateBMPFile(HWND__*, TCHAR*, tagBITMAPINFO*, HBITMAP__*, HDC__*)' 
}

Im Zweifelsfall bitte auch folgende Hinweise beachten:
C/C++ Forum :: FAQ - Sonstiges :: Wohin mit meiner Frage?

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