private System.Drawing.Bitmap CreateBitmapFromDib(Stream dib)

{

BinaryReader reader = new BinaryReader(dib);

int headerSize = reader.ReadInt32();

int pixelSize = (int)dib.Length - headerSize;

int fileSize = 14 + headerSize + pixelSize;

MemoryStream bmp = new MemoryStream(fileSize);

BinaryWriter writer = new BinaryWriter(bmp);

// 1. 把位图的一些元数据写进去，下面这几次Write相当于填写Win32的

// BITMAPFILEHEADER结构

writer.Write((byte)'B');

writer.Write((byte)'M');

writer.Write(fileSize);

writer.Write((int)0);

writer.Write(14 + headerSize);

// 2. 把DIB位图中的像素矩阵拷贝出来到我们指定的MemoryStream里。

// 因为我们要从MemoryStream里面生成System.Drawing.Bitmap对象

// 然后再颇为曲折地从Bitmap对象生成WPF的BitmapImage对象

dib.Position = 0;

byte[] data = new byte[(int)dib.Length];

dib.Read(data, 0, (int)dib.Length);

writer.Write(data, 0, (int)data.Length);

// 3. 生成Bitmap对象—这个是Winform里面的Bitmap对象

bmp.Position = 0;

return new System.Drawing.Bitmap(bmp);

}

HDIB WINAPI ReadDIBFile(CFile& file)

{

BITMAPFILEHEADER bmfHeader;

UINT nBitsSize;

HDIB hDIB;

LPSTR pDIB;

/*

* get length of DIB in bytes for use when reading

*/

nBitsSize = (UINT)file.GetLength();

/*

* Go read the DIB file header and check if it's valid.

*/

if (file.Read((LPSTR)&bmfHeader, sizeof(bmfHeader)) != sizeof(bmfHeader))

return NULL;

if (bmfHeader.bfType != DIB_HEADER_MARKER)

return NULL;

/*

* Allocate memory for DIB

*/

hDIB = (HDIB) ::GlobalAlloc(GMEM_MOVEABLE | GMEM_ZEROINIT, (DWORD)nBitsSize);

if (hDIB == 0)

{

return NULL;

}

pDIB = (LPSTR) ::GlobalLock((HGLOBAL) hDIB);

/*

* Go read the bits.

*/

if (file.Read(pDIB, nBitsSize - sizeof(BITMAPFILEHEADER)) !=

nBitsSize - sizeof(BITMAPFILEHEADER) )

{

::GlobalUnlock((HGLOBAL) hDIB);

::GlobalFree((HGLOBAL) hDIB);

return NULL;

}

::GlobalUnlock((HGLOBAL) hDIB);

return hDIB;

}

private BitmapSource BitmapToImageSource(System.Drawing.Bitmap bitmap)

{

BitmapSource destination;

IntPtr hBitmap = bitmap.GetHbitmap();

BitmapSizeOptions sizeOptions = BitmapSizeOptions.FromEmptyOptions();

destination = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(hBitmap, IntPtr.Zero, Int32Rect.Empty, sizeOptions);

destination.Freeze();

return destination;

}