vc打开bmp格式图片

我建的是基于窗口的mfc工程  无法显示图片 一直显示内存不足  求高手解决
FILE *fp;
    RGBQUAD * ColorTable;
    BYTE * line_buf;
    int line_Width;
    fp=fopen("c:\\tp\\tt.bmp","rb");
    if (bf.bfType!=0x4D42)
    {
        fclose(fp);
        
    }
    fread(&bi,40,1,fp);
    line_Width=((bi.biWidth + 3)/4)*4;               
    line_buf=(BYTE*)new BYTE[line_Width];           
    int bufsize;                                   
    bufsize=bi.biWidth*bi.biHeight;                  
    r=(BYTE*)new BYTE[bufsize];
    g=(BYTE*)new BYTE[bufsize];
    b=(BYTE*)new BYTE[bufsize];
    ColorTable=new RGBQUAD[256];                                
    fread(ColorTable,sizeof(ColorTable),256,fp);   
    int m,n,i,l=0;
    for(m=0;m<bi.biHeight;m++)                  
    {   
        fread(line_buf,line_Width,1,fp);           
        for(n=0;n<bi.biWidth;n++)               
        {
            i=line_buf[n];                        
            r[l]=ColorTable[i].rgbBlue;
            g[l]=ColorTable[i].rgbGreen;
            b[l]=ColorTable[i].rgbRed;

            l++;
        }
        
    }
    fclose(fp);
    nMarkIsRead = 1;
    if (nMarkIsRead == 1)
        {
            CPaintDC dc(this);
            int nColorIndex, i, j, nWidth;
            BYTE btBlue,btGreen,btRed;
            COLORREF color;      

            if (bi.biBitCount == 8)
            {
                nWidth = ((bi.biWidth + 3) / 4) * 4;
            }
            else if (bi.biBitCount == 24)
            {
                nWidth = ((bi.biWidth * 3 + 3) / 4) * 4;
            }
            else
            {
                MessageBox("Wrong BitCount");
                return ;
            }
            if (bi.biBitCount == 8)
            {

                for (j = 0; j < bi.biHeight; j++)
                {
                    for(i = 0; i < bi.biWidth; i ++)
                    {
                        nColorIndex = j * bi.biWidth + i;
                        btBlue = b[nColorIndex];
                        btGreen = g[nColorIndex];
                        btRed = r[nColorIndex];
                        color = RGB(btRed, btGreen, btBlue);
                        dc.SetPixel(i, bi.biHeight - 1 - j, color);
                    }
                }
            }
            
        }
在头文件中建立的全局变量
public:
    BITMAPFILEHEADER bf;
    BITMAPINFOHEADER bi;
    int nMarkIsRead;
    BYTE *r,*g,*b;