Programm schmiert ab

[***]

Hi,

ich habe folgenden Code:

HRESULT CBitmapGDI::load (std::string FileName)
{
	if (this->m_DIB)
	{
		delete [] this->m_DIB;
		this->m_DIB = NULL;
	}

	HANDLE				FileHandle;
	BITMAPFILEHEADER	DIBHeader;          // File information of the (valid) bitmap
	DWORD				BytesRead;          // Number of bytes read, used to test

	if ((UINT)(FileHandle = CreateFile (FileName.c_str(), GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, 0, 0)) == 0xffffffff)
	{
		// Datei nicht gefunden, Funktion beenden!
		return E_FAIL;
	}

	ReadFile (FileHandle, &DIBHeader, sizeof (BITMAPFILEHEADER), &BytesRead, NULL);

	if (BytesRead != sizeof (BITMAPFILEHEADER) || DIBHeader.bfType != 0x4D42)
	{
		CloseHandle (FileHandle);
		return E_FAIL;
	}

	if (!(this->m_DIBbits = new UCHAR [DIBHeader.bfSize - sizeof (BITMAPFILEHEADER)]))
	{ 
		CloseHandle (FileHandle);
		return E_FAIL;
	}

	ReadFile (FileHandle, this->m_DIBbits, DIBHeader.bfSize, &BytesRead, NULL);

	if (BytesRead != DIBHeader.bfSize - sizeof (BITMAPFILEHEADER))
	{
		CloseHandle (FileHandle);
		return E_FAIL;
	}
	CloseHandle (FileHandle);

	this->m_BitmapInfo = reinterpret_cast <BITMAPINFO*> (this->m_DIB);

	this->m_DIBbits = this->m_DIB + this->m_BitmapInfo->bmiHeader.biSize; // << Genau Hier schmiert er ab mit einer "Unhandled Exception"!

	if (this->m_BitmapInfo->bmiHeader.biBitCount <= 8)
	{
		this->m_DIBbits += (1 << this->m_BitmapInfo->bmiHeader.biBitCount) * sizeof (RGBQUAD);
	}

	this->m_width	= this->m_BitmapInfo->bmiHeader.biWidth;
	this->m_height	= this->m_BitmapInfo->bmiHeader.biHeight;

	if (this->m_BitmapInfo->bmiHeader.biHeight > 0)
	{
		this->m_BitmapInfo->bmiHeader.biHeight =- this->m_BitmapInfo->bmiHeader.biHeight;
	}

	return S_OK;
}

Dies hier steht in der MessageBox die erscheint:

Unhandled exception at 0x0041436a in Win32API Wrapper.exe: 0xC0000005: Access violation reading location 0x00000000.

Weiß einer wieso das Programm abschmiert?

[***]

Achja das sind die Members:

private:
	int m_x;
	int m_y;
	int m_width;
	int m_height;

	UCHAR             *m_DIB;
	BITMAPINFO        *m_BitmapInfo;
	UCHAR             *m_DIBbits;
};

[flenders]

Du setzt doch oben this->m_DIB auf NULL und castest es dann nach this->m_BitmapInfo - eigentlich müssten dann doch beide NULL sein
Wass willst du damit bezwecken, oder blick ich es grad nur nicht