CaptureScreenToBitmap

[Bluesteel]

Macht einen Schnappschuss des Bildschirminhalts und speichert ihn in ein BMP-Bild. Die Funktion ist simpel, zuerst wird der Bildschirminhalt in einen Compatible Memory DC kopiert, anschließend die Daten in eine Bitmap-Struktur konvertiert und zum Schluss alles in die BMP-Datei geschrieben. Der String-Parameter gibt den Dateinamen an, unter dem das Bild gespeichert werden soll. Bei Erfolg liefert die Funktion 1 zurück, sonst 0.
/*

Make a screenshot and save it to a BMP image



Sources:

1) MSDN index["bitmaps [Win32]", "code examples"]->"Capturing an image"

2) MSDN index["bitmaps [Win32]", "code examples"]->"Storing an image"





*/



int CaptureBMP(LPCTSTR szFile)

{

// Source[1]

HDC hdcScr, hdcMem;

HBITMAP hbmScr;

BITMAP bmp;

int iXRes, iYRes;



// Create a normal DC and a memory DC for the entire screen. The

// normal DC provides a "snapshot" of the screen contents. The

// memory DC keeps a copy of this "snapshot" in the associated

// bitmap.

hdcScr = CreateDC("DISPLAY", NULL, NULL, NULL);

hdcMem = CreateCompatibleDC(hdcScr);



iXRes = GetDeviceCaps(hdcScr, HORZRES);

iYRes = GetDeviceCaps(hdcScr, VERTRES);



// Create a compatible bitmap for hdcScreen.

hbmScr = CreateCompatibleBitmap(hdcScr, iXRes, iYRes);

if (hbmScr == 0) return 0;



// Select the bitmaps into the compatible DC.

if (!SelectObject(hdcMem, hbmScr)) return 0;



// Copy color data for the entire display into a

// bitmap that is selected into a compatible DC.

if (!StretchBlt(hdcMem,

0, 0, iXRes, iYRes,

hdcScr,

0, 0, iXRes, iYRes,

SRCCOPY))



return 0;



// Source[2]

PBITMAPINFO pbmi;

WORD cClrBits;



// Retrieve the bitmap's color format, width, and height.

if (!GetObject(hbmScr, sizeof(BITMAP), (LPSTR) &bmp)) return 0;



// 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.

pbmi->bmiHeader.biSizeImage = (pbmi->bmiHeader.biWidth + 7) / 8

* pbmi->bmiHeader.biHeight * cClrBits;



// Set biClrImportant to 0, indicating that all of the

// device colors are important.

pbmi->bmiHeader.biClrImportant = 0;



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) pbmi;

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



if (!lpBits) return 0;



// Retrieve the color table (RGBQUAD array) and the bits

// (array of palette indices) from the DIB.

if (!GetDIBits(hdcMem, hbmScr, 0, (WORD) pbih->biHeight, lpBits, pbmi, DIB_RGB_COLORS)) return 0;



// Create the .BMP file.

hf = CreateFile(szFile,

GENERIC_READ | GENERIC_WRITE,

(DWORD) 0,

NULL,

CREATE_ALWAYS,

FILE_ATTRIBUTE_NORMAL,

(HANDLE) NULL);

if (hf == INVALID_HANDLE_VALUE) return 0;



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)) return 0;



// Copy the BITMAPINFOHEADER and RGBQUAD array into the file.

if (!WriteFile(hf, (LPVOID) pbih, sizeof(BITMAPINFOHEADER)

+ pbih->biClrUsed * sizeof (RGBQUAD),

(LPDWORD) &dwTmp, NULL))

return 0;



// 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)) return 0;



// Close the .BMP file.

if (!CloseHandle(hf)) return 0;



// Free memory.

GlobalFree((HGLOBAL)lpBits);

ReleaseDC(0, hdcScr);

ReleaseDC(0, hdcMem);



return 1;

}

[Solstice]

Jetzt noch in png speichern können und nur einen bestimmten Bildschirmausschnitt ...

lol... wär geil....

hab zwar dazu n proggi, aber das mal so als QT wär cool

[Bluesteel]

das brauchst du doch nur noch erweitern um das speichern und schon klappts ^^