asp.net 图片合成，合成图片，把3张图片合成为1张

用法：只需要调用tphc方法即可

#region 图片合成

/// <summary>
/// 合成图片
/// </summary>
/// <param name="fileFoldUrl">文件夹url</param>
/// <param name="fileName">文件名</param>
/// <param name="_alMemo">要合成的每张图片的大小数组</param>
/// <param name="_width">合成后的宽度</param>
/// <param name="_height">合成后的高度</param>
public void tphc(string fileFoldUrl, string fileName, ArrayList _alMemo, int _width, int _height)
{
    byte[] tp = get_tphcMemo(_alMemo, _width, _height);

    this.view_picture(fileFoldUrl, fileName, tp);
}

/// <summary>
/// 获取合成图片后的字节大小
/// </summary>
/// <param name="_al">要合成的每张图片的大小数组</param>
/// <param name="_width">合成后的宽度</param>
/// <param name="_height">合成后的高度</param>
/// <returns>byte[]</returns>
private byte[] get_tphcMemo(ArrayList _al, int _width, int _height)
{
    //byte[]
    byte[] tp = null;

    //MemoryStream
    MemoryStream ms = null;
    MemoryStream imgms = null;

    //Bitmap
    Bitmap bmp = null;

    //image
    System.Drawing.Image img = null;

    //Graphics
    Graphics gp = null;

    try
    {
        ms = new MemoryStream();

        bmp = new Bitmap(_width, _height);

        bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);

        img = System.Drawing.Image.FromStream(ms);

        int i_top = 0;

        for (int pic_i = 0; pic_i < _al.Count; pic_i++)
        {
            if (pic_i == 3)
                break;

            gp = Graphics.FromImage(img);

            MemoryStream ms1 = new MemoryStream(((byte[])_al[pic_i]));

            System.Drawing.Image img1 = System.Drawing.Image.FromStream(ms1);

            Bitmap bmp1 = new Bitmap(img1);

            Rectangle rtl = new Rectangle(i_top, 0, bmp1.Width, bmp1.Height);

            gp.DrawImage(bmp1, rtl, 0, 0, bmp1.Width, bmp1.Height, GraphicsUnit.Pixel);

            i_top += bmp1.Width;

            ms1.Dispose();

            img1.Dispose();

            bmp1.Dispose();

            gp.Dispose();
        }

        imgms = new MemoryStream();

        img.Save(imgms, img.RawFormat);

        imgms.Position = 0;

        tp = new byte[imgms.Length];

        imgms.Read(tp, 0, Convert.ToInt32(imgms.Length));

        return tp;
    }
    catch (Exception ex)
    {
        throw new Exception(ex.Message);
    }
}

#endregion 图片合成

/// <summary>
/// 保存图片
/// </summary>
/// <param name="fileFoldUrl">文件夹url</param>
/// <param name="fileName">文件名</param>
/// <param name="zp">文件的字节数组</param>
public void view_picture(string fileFoldUrl, string fileName, byte[] zp)
{
    MemoryStream ms = new MemoryStream(zp);
    Bitmap btp = new Bitmap(ms);
    DirectoryInfo dti = new DirectoryInfo(fileFoldUrl);
    string fileUrl = fileFoldUrl + fileName + ".jpg";
    btp.Save(fileUrl);
}

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