我有一个来自相机的ByteArray,它只是一个流而且没有位图头。
我搜索了一个演示,但它们都是用C ++编写的。
我尝试将bitmapheader添加到我的代码中,但抛出了ParameterException。如何从ByteArray创建位图文件?
答案 0 :(得分:4)
您无法直接使用没有位图标头的原始数据创建位图类。位图标题就像是位图图像的配方。它包括有关宽度,高度,每像素位数,数据长度等的基本信息,以便为图像制作正确的数组。
如果仔细查看位图标题结构here
,制作位图标头相当容易但没有什么比完整的源代码示例更好。
我把它们分成几部分,并在整个过程中为你评论每个步骤。它可能看起来有点过分和冗长,但我想这对你来说是一个很好的指南。
以下是2×2像素,24位位图的示例(Windows DIB 标题BITMAPINFOHEADER),像素格式为RGB24。
BMP文件格式 - 维基百科
#region Bitmap Making...
// BmpBufferSize : a pure length of raw bitmap data without the header.
// the 54 value here is the length of bitmap header.
byte[] BitmapBytes = new byte[BmpBufferSize + 54];
#region Bitmap Header
// 0~2 "BM"
BitmapBytes[0] = 0x42;
BitmapBytes[1] = 0x4d;
// 2~6 Size of the BMP file - Bit cound + Header 54
Array.Copy(BitConverter.GetBytes(BmpBufferSize + 54), 0, BitmapBytes, 2, 4);
// 6~8 Application Specific : normally, set zero
Array.Copy(BitConverter.GetBytes(0), 0, BitmapBytes, 6, 2);
// 8~10 Application Specific : normally, set zero
Array.Copy(BitConverter.GetBytes(0), 0, BitmapBytes, 8, 2);
// 10~14 Offset where the pixel array can be found - 24bit bitmap data always starts at 54 offset.
Array.Copy(BitConverter.GetBytes(54), 0, BitmapBytes, 10, 4);
#endregion
#region DIB Header
// 14~18 Number of bytes in the DIB header. 40 bytes constant.
Array.Copy(BitConverter.GetBytes(40), 0, BitmapBytes, 14, 4);
// 18~22 Width of the bitmap.
Array.Copy(BitConverter.GetBytes(image.Width), 0, BitmapBytes, 18, 4);
// 22~26 Height of the bitmap.
Array.Copy(BitConverter.GetBytes(image.Height), 0, BitmapBytes, 22, 4);
// 26~28 Number of color planes being used
Array.Copy(BitConverter.GetBytes(0), 0, BitmapBytes, 26, 2);
// 28~30 Number of bits. If you don't know the pixel format, trying to calculate it with the quality of the video/image source.
if (image.PixelFormat == System.Drawing.Imaging.PixelFormat.Format24bppRgb)
{
Array.Copy(BitConverter.GetBytes(24), 0, BitmapBytes, 28, 2);
}
// 30~34 BI_RGB no pixel array compression used : most of the time, just set zero if it is raw data.
Array.Copy(BitConverter.GetBytes(0), 0, BitmapBytes, 30, 4);
// 34~38 Size of the raw bitmap data ( including padding )
Array.Copy(BitConverter.GetBytes(BmpBufferSize), 0, BitmapBytes, 34, 4);
// 38~46 Print resolution of the image, 72 DPI x 39.3701 inches per meter yields
if (image.PixelFormat == System.Drawing.Imaging.PixelFormat.Format24bppRgb)
{
Array.Copy(BitConverter.GetBytes(0), 0, BitmapBytes, 38, 4);
Array.Copy(BitConverter.GetBytes(0), 0, BitmapBytes, 42, 4);
}
// 46~50 Number of colors in the palette
Array.Copy(BitConverter.GetBytes(0), 0, BitmapBytes, 46, 4);
// 50~54 means all colors are important
Array.Copy(BitConverter.GetBytes(0), 0, BitmapBytes, 50, 4);
// 54~end : Pixel Data : Finally, time to combine your raw data, BmpBuffer in this code, with a bitmap header you've just created.
Array.Copy(BmpBuffer as Array, 0, BitmapBytes, 54, BmpBufferSize);
#endregion - bitmap header process
#endregion - bitmap making process
答案 1 :(得分:0)
使用System.Drawing.Bitmap类
答案 2 :(得分:-1)
查看以下链接:
答案 3 :(得分:-1)
也许这就是你要找的......
http://social.msdn.microsoft.com/Forums/en-US/winforms/thread/e57f7731-c703-4c17-b1a2-32b155f9b745/
答案 4 :(得分:-1)
这将有效
...
using System;
using System.IO;
using System.Drawing;
...
public Image ByteArrayToImage(byte[] byteArrayIn)
{
MemoryStream ms = new MemoryStream(byteArrayIn);
Image img = Image.FromStream(ms);
return img;
}