求解CreateDIBSection函数的使用方法

    struct BLENDFUNCTION
    {
        public byte BlendOp;
        public byte BlendFlags;
        public byte SourceConstantAlpha;
        public byte AlphaFormat;

    }
    struct  BITMAPINFO
    {
        public BITMAPINFOHEADER bmiHeader;
        public BLENDFUNCTION bmiColors;
    }

    struct BITMAPINFOHEADER
    {
public int biSize;
public int  biWidth;
public int  biHeight;
public short   biPlanes;
public short   biBitCount;
public int  biCompression;
public int  biSizeImage;
public int  biXPelsPerMeter;
public int  biYPelsPerMeter;
public int  biClrUsed;
public int  biClrImportant;

    }
            BITMAPINFO BMI = new BITMAPINFO();
            BMI.bmiHeader.biSize =40;
            BMI.bmiHeader.biWidth = f_size .Width ;
            BMI.bmiHeader.biHeight = f_size .Height ;
            BMI.bmiHeader.biPlanes = 1;
            BMI.bmiHeader.biBitCount = 32;
            BMI.bmiHeader.biSizeImage = BMI.bmiHeader.biWidth * BMI.bmiHeader.biHeight * BMI.bmiHeader.biBitCount / 8;

            hwnd = zhwnd;
            IntPtr temp = API.GetDC(hwnd);
            hdc = API.CreateCompatibleDC(temp);
            API.ReleaseDC(hwnd, temp );
            hDIB = API.CreateDIBSection(hdc, BMI,0,0,0,0);
到这就不能下去了。。。在c#怎么写的呀求函数申明求CreateDIBSection使用方法 --------------------编程问答-------------------- 原来是缺少ref。。。没有传址坑爹 --------------------编程问答-------------------- 现在到处都是P/Invoke啊

补充：.NET技术 ,  C#