.bmp 不是 Windows 位图？
当我创建这样的位图时：
var testImage = new Bitmap(320, 240);
var testDataLock = testImage.LockBits(new Rectangle(new Point(), testImage.Size),
System.Drawing.Imaging.ImageLockMode.WriteOnly, PixelFormat.Format24bppRgb);
unsafe
{
var aaa = CamData.ToArray();
UInt32 lOffset = 0;
UInt32 lPos = 0;
byte* lDst = (byte*)testDataLock.Scan0;
byte bitshift = 8;
fixed (UInt16* lSrc = aaa)
{
while (lOffset < testImage.Width * testImage.Height)
{
lDst[lPos] = (byte)(lSrc[lOffset] >> bitshift);
lDst[lPos + 1] = lDst[lPos];
lDst[lPos + 2] = lDst[lPos];
lOffset++;
lPos += 3;
// take care of the padding in the destination bitmap
if ((lOffset % testImage.Width) == 0)
lPos += (UInt32)testDataLock.Stride - (uint)(testImage.Width * 3);
}
}
}
testImage.UnlockBits(testDataLock);
testImage.Save(@"H:\Test.bmp");
尝试使用可视化库打开此文件时总是出现错误：
Unknown file type! H:\test.bmp is not a Windows BMP file!
但在 Windows 中我可以使用查看器等打开该文件...没有问题 有人知道为什么我会收到这个错误吗？
谢谢
when I create a bitmap like this:
var testImage = new Bitmap(320, 240);
var testDataLock = testImage.LockBits(new Rectangle(new Point(), testImage.Size),
System.Drawing.Imaging.ImageLockMode.WriteOnly, PixelFormat.Format24bppRgb);
unsafe
{
var aaa = CamData.ToArray();
UInt32 lOffset = 0;
UInt32 lPos = 0;
byte* lDst = (byte*)testDataLock.Scan0;
byte bitshift = 8;
fixed (UInt16* lSrc = aaa)
{
while (lOffset < testImage.Width * testImage.Height)
{
lDst[lPos] = (byte)(lSrc[lOffset] >> bitshift);
lDst[lPos + 1] = lDst[lPos];
lDst[lPos + 2] = lDst[lPos];
lOffset++;
lPos += 3;
// take care of the padding in the destination bitmap
if ((lOffset % testImage.Width) == 0)
lPos += (UInt32)testDataLock.Stride - (uint)(testImage.Width * 3);
}
}
}
testImage.UnlockBits(testDataLock);
testImage.Save(@"H:\Test.bmp");
I alway get an error while trying to open this file with an visualisation lib:
Unknown file type! H:\test.bmp is not a Windows BMP file!
but in windows I can open the file with the viewer etc... there are no problems
does anybody know why I get this error?
thanks
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您可以将
System.Drawing.Bitmap保存到有效的 windows .bmp，如下所示：第二个参数（您未包含）指定必须保存位图的格式。
另外，请务必检查您的可视化库是否支持 24 位每像素位图，
因为这是您创建位图的格式。
请参阅：
PixelFormat.Format24bppRgbyou can save a
System.Drawing.Bitmapto a valid windows .bmp like this:The second parameter (which you did not include) specifies the format in which the bitmap must be saved.
Also, be sure to check if your visualisation lib supports 24Bit Per Pixel bitmaps,
since this is the format you are creating your bitmap in.
see:
PixelFormat.Format24bppRgb正如您可以阅读 MSDN 中的“备注”部分，您的图像将被保存如果未指定编码器，则为 PNG。
As you can read at MSDN in the Remarks section your image will be saved as PNG if no encoder is specified.