Cannot access CBitmap bits - c++

Question

iam trying to convert a CBitmap to DIB but it is not working in a console application
how can i get a Device context ?
neither the SetDIBColorTable nor GetDIBits is working
BITMAP bimapInfo;
m_bmBitmap->GetBitmap(&bimapInfo);
HDC hScrDC = ::GetDC(NULL);
HDC hMemDC = NULL;
hMemDC = ::CreateCompatibleDC(hScrDC);
//HGDIOBJ oldbmp = ::SelectObject(hMemDC,b);
BITMAP bmp;
const DWORD dwcBihSize = sizeof(BITMAPINFOHEADER);
BITMAPINFOHEADER bi;
//GetObject(b,sizeof(tagBITMAP),&bmp);
long dwSize = dwcBihSize +(pow(2.0,bimapInfo.bmBitsPixel)) * sizeof(RGBQUAD) + ((bmp.bmBitsPixel * width) * height);
LPBITMAPINFO pDIB ;
output(dwSize);
pDIB = (LPBITMAPINFO)new BYTE[dwSize];
pDIB->bmiHeader.biSize = dwcBihSize;
pDIB->bmiHeader.biWidth = width;
pDIB->bmiHeader.biHeight = height;
pDIB->bmiHeader.biBitCount = bimapInfo.bmBitsPixel;
pDIB->bmiHeader.biPlanes = 1;
pDIB->bmiHeader.biCompression = BI_RGB;
pDIB->bmiHeader.biXPelsPerMeter = 1000;
pDIB->bmiHeader.biYPelsPerMeter = 1000;
pDIB->bmiHeader.biClrUsed = 0;
pDIB->bmiHeader.biClrImportant = 0;
LPRGBQUAD lpColors =(LPRGBQUAD)(pDIB+pDIB->bmiHeader.biSize);
output((int)lpColors);
int dibCols = pow(2.0,pDIB->bmiHeader.biBitCount);
output(dibCols);
SetDIBColorTable(hMemDC,0,dibCols,lpColors);
output(dibCols);
void* bitArray = pDIB + pDIB->bmiHeader.biSize+dibCols *sizeof(RGBQUAD);
int sizeOfBitArray = dwSize - pDIB->bmiHeader.biSize+dibCols *sizeof(RGBQUAD);
for(int i=0;i<dibCols;i++)
{
lpColors[i].rgbRed=0;
lpColors[i].rgbBlue=0;
lpColors[i].rgbGreen=0;
lpColors[i].rgbReserved=0;
}
output(SetDIBColorTable(hMemDC,0,dibCols,lpColors));
int depth =bmp.bmBitsPixel == 1 ? IPL_DEPTH_1U : IPL_DEPTH_8U;
int nChannels = 3;
IplImage* image= cvCreateImage(cvSize(width,height),depth,3);
output(GetDIBits(hMemDC,b,0,height,bitArray,pDIB,DIB_RGB_COLORS));
image->imageData = (char*)bitArray;
cvSaveImage("c:\img.jpg",image);
iam trying to convert a CBitmap to DIB but it is not working in a console application
how can i get a Device context ?
neither the SetDIBColorTable nor GetDIBits is working