myBitmap.RawFormat与任何已知的ImageFormat有所不同？

问题描述

  var bmp = new Bitmap（width，width，高度）; 
  

现在，当我观察它的RawFormat.Guid时，我发现它与所有预定义的ImageFormat不同（当我期望它是JPEG）。

  ImageFormat.Jpeg.Guid 
 {b96b3cae-0728-11d3-9d7b-0000f81ef32e } 
 format.Guid 
 {b96b3caa-0728-11d3-9d7b-0000f81ef32e} 
  

任何想法为什么？代码的哪些部分决定了我创建的位图的RawFormat是什么？我们怎样才能确保它是一个有效的ImageFormat？

谢谢。

在Windows SDK中，< gdiplusimaging.h> 头文件：

  DEFINE_GUID（ImageFormatUndefined，0xb96b3ca9,0x0728,0x11d3,0x9d，0x7b，0x00,0x00,0xf8,0x1e，0xf3,0x2e）; 
 DEFINE_GUID（ImageFormatMemoryBMP，0xb96b3caa，0x0728,0x11d3,0x9d，0x7b，0x00,0x00,0xf8,0x1e，0xf3,0x2e）; 
 DEFINE_GUID（ImageFormatBMP，0xb96b3cab，0x0728,0x11d3,0x9d，0x7b，0x00,0x00,0xf8,0x1e，0xf3,0x2e）; 
 DEFINE_GUID（ImageFormatEMF，0xb96b3cac，0x0728,0x11d3,0x9d，0x7b，0x00,0x00,0xf8,0x1e，0xf3,0x2e）; 
 DEFINE_GUID（ImageFormatWMF，0xb96b3cad，0x0728,0x11d3,0x9d，0x7b，0x00,0x00,0xf8,0x1e，0xf3,0x2e）; 
 DEFINE_GUID（ImageFormatJPEG，0xb96b3cae，0x0728,0x11d3,0x9d，0x7b，0x00,0x00,0xf8,0x1e，0xf3,0x2e）; 
 DEFINE_GUID（ImageFormatPNG，0xb96b3caf，0x0728,0x11d3,0x9d，0x7b，0x00,0x00,0xf8,0x1e，0xf3,0x2e）; 
 DEFINE_GUID（ImageFormatGIF，0xb96b3cb0,0x0728,0x11d3,0x9d，0x7b，0x00,0x00,0xf8,0x1e，0xf3,0x2e）; 
 DEFINE_GUID（ImageFormatTIFF，0xb96b3cb1,0x0728,0x11d3,0x9d，0x7b，0x00,0x00,0xf8,0x1e，0xf3,0x2e）; 
 DEFINE_GUID（ImageFormatEXIF，0xb96b3cb2,0x0728,0x11d3,0x9d，0x7b，0x00,0x00,0xf8,0x1e，0xf3,0x2e）; 
 DEFINE_GUID（ImageFormatIcon，0xb96b3cb5,0x0728,0x11d3,0x9d，0x7b，0x00,0x00,0xf8,0x1e，0xf3,0x2e）; 
  

Memory BMP，非常合适。是的，微软经常手动使用GUID。调皮。

I'm working with GDI+ and I create a new bitmap like this:

var bmp = new Bitmap(width, height);

now when I observe its RawFormat.Guid I see that it is different from all predefined ImageFormats (while I expect it to be JPEG).

ImageFormat.Jpeg.Guid
    {b96b3cae-0728-11d3-9d7b-0000f81ef32e}
format.Guid
    {b96b3caa-0728-11d3-9d7b-0000f81ef32e}

Interesting part is that as you can see they are identical except one character which makes me even more confused.

Any idea why? Which parts of code determines what is the RawFormat of the bitmap I create? How can we ensure it's a valid ImageFormat?

Thanks.

解决方案

From the Windows SDK, <gdiplusimaging.h> header file:

DEFINE_GUID(ImageFormatUndefined, 0xb96b3ca9,0x0728,0x11d3,0x9d,0x7b,0x00,0x00,0xf8,0x1e,0xf3,0x2e);
DEFINE_GUID(ImageFormatMemoryBMP, 0xb96b3caa,0x0728,0x11d3,0x9d,0x7b,0x00,0x00,0xf8,0x1e,0xf3,0x2e);
DEFINE_GUID(ImageFormatBMP, 0xb96b3cab,0x0728,0x11d3,0x9d,0x7b,0x00,0x00,0xf8,0x1e,0xf3,0x2e);
DEFINE_GUID(ImageFormatEMF, 0xb96b3cac,0x0728,0x11d3,0x9d,0x7b,0x00,0x00,0xf8,0x1e,0xf3,0x2e);
DEFINE_GUID(ImageFormatWMF, 0xb96b3cad,0x0728,0x11d3,0x9d,0x7b,0x00,0x00,0xf8,0x1e,0xf3,0x2e);
DEFINE_GUID(ImageFormatJPEG, 0xb96b3cae,0x0728,0x11d3,0x9d,0x7b,0x00,0x00,0xf8,0x1e,0xf3,0x2e);
DEFINE_GUID(ImageFormatPNG, 0xb96b3caf,0x0728,0x11d3,0x9d,0x7b,0x00,0x00,0xf8,0x1e,0xf3,0x2e);
DEFINE_GUID(ImageFormatGIF, 0xb96b3cb0,0x0728,0x11d3,0x9d,0x7b,0x00,0x00,0xf8,0x1e,0xf3,0x2e);
DEFINE_GUID(ImageFormatTIFF, 0xb96b3cb1,0x0728,0x11d3,0x9d,0x7b,0x00,0x00,0xf8,0x1e,0xf3,0x2e);
DEFINE_GUID(ImageFormatEXIF, 0xb96b3cb2,0x0728,0x11d3,0x9d,0x7b,0x00,0x00,0xf8,0x1e,0xf3,0x2e);
DEFINE_GUID(ImageFormatIcon, 0xb96b3cb5,0x0728,0x11d3,0x9d,0x7b,0x00,0x00,0xf8,0x1e,0xf3,0x2e);

"Memory BMP", quite appropriate. And yes, Microsoft often messes with GUIDs by hand. Naughty.

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