Saving Bitmap

[nordicGod]

Hi at all,

here is my problem:
I wrote a C++ class which scans an image. The Scan-Process is successfull, i guess, but i can´t save the DIB Bitmap.

Well, I got to the Point “TWRC_XFERDONE” an there i will do that:
SendMessage(hWnd, WM_TW_IMAGE, 0, hBitmap);
hBitmap is the TW_UINT32

Now I will save the Bitmap at the Case WM_TW_IMAGE:

HANDLE hBitmap_n = GlobalLock((void*)lParam);



BITMAP bmp;



if(GetObject(hBitmap_n, sizeof(BITMAP), (LPSTR)&bmp)==0) MessageBox(NULL,"fehler geobj","fehler",MB_OK);

HDC hdcBmp; hdcBmp = CreateCompatibleDC(hdc);

SelectObject(hdcBmp, hBitmap_n);

bool b = BitBlt(hdc,150,120, bmp.bmWidth,bmp.bmHeight, (HDC)hBitmap_n, 0,0, SRCCOPY);



if (b==false) MessageBox(NULL,"fehler","fehler7",MB_OK);



// Infoheader

BITMAPINFO infoheader;

infoheader.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);

infoheader.bmiHeader.biWidth = 500; // Breite in Pixeln

infoheader.bmiHeader.biHeight = 500; // Höhe in Pixeln

infoheader.bmiHeader.biPlanes = 1;

infoheader.bmiHeader.biBitCount = 24; // Farbtiefe in bits

infoheader.bmiHeader.biCompression = 0;

infoheader.bmiHeader.biSizeImage = 0;

infoheader.bmiHeader.biXPelsPerMeter = 0;

infoheader.bmiHeader.biYPelsPerMeter = 0;

infoheader.bmiHeader.biClrUsed = 0;

infoheader.bmiHeader.biClrImportant = 0;



// Platz für die Pixeldaten reservieren

int* bitmap = new int[500*500*3]; // Breite*Höhe*Farbtiefe (Bytes)



// Fileheader

BITMAPFILEHEADER fileheader;

fileheader.bfType = 19778; // 'BM'

fileheader.bfSize = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) + sizeof(bitmap); // Gesamtgröße der Datei

fileheader.bfReserved1 = 0;

fileheader.bfReserved2 = 0;

fileheader.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER); // ab hier Pixel



//##############

// Create a memory DC to draw in

//HDC dc  = GetDC(hWnd); // old: hWnd



HDC dc  = CreateDC(NULL, NULL, NULL, NULL);

HDC mem = CreateCompatibleDC(dc);



// Create a bitmap and link it to the memory dc

HBITMAP hbitmap = CreateCompatibleBitmap(dc, 500, 500);

//##############

//dc	old		/*new_bmpHandle (struct HBITMAP__ *)*/

if (GetDIBits(mem, (HBITMAP)hBitmap_n, 0, 500, bitmap, (BITMAPINFO*)&infoheader, DIB_RGB_COLORS)==0)

//if (SetDIBits(mem, hBIT/*(HBITMAP)lParam/*hbitmap*/, 0, 500, bitmap, (BITMAPINFO*)&infoheader, DIB_RGB_COLORS)==0)

MessageBox(NULL,"fehler","fehler0",MB_OK);

// Eine neue Datei erstellen bzw eine bestehende öffnen

HANDLE hfile = CreateFile("d:\cmap.bmp", GENERIC_WRITE, 0, NULL, OPEN_ALWAYS, 0, 0);



// Die Daten in die Datei schreiben

DWORD dummy;



WriteFile(hfile, &fileheader, 14, &dummy, NULL);

WriteFile(hfile, &infoheader, 40, &dummy, NULL);

WriteFile(hfile, bitmap, 750000, &dummy, NULL);



// Aufräumen

DeleteObject(hBitmap_n);

ReleaseDC(hWnd, dc);

CloseHandle(hfile);

The Bitmap is grey…not the Bitmap i scanned.
Hope, you will find an error, im confused…….

sorry for my bad english & thanks for helping me

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