C# [GDI+] [API] Get Image bytes Length

 1 　　　　　static int GetEncoderClsid(string format, CLSID* clsidEncoder)
 2         {
 3             int f = 0;
 4             uint uenc = 0u, usize = 0u;
 5             ushort* psz = _L(format);
 6             if (GdipGetImageEncodersSize(&uenc, &usize) == 0)
 7             {
 8                 ImageCodecInfo* pici = (ImageCodecInfo*)LocalAlloc(0u, (void*)usize);
 9                 if (GdipGetImageEncoders(uenc, usize, pici) == 0)
10                 {
11                     for (int i = 0; i < uenc; i++)
12                     {
13                         if (lstrcmpW(pici->MimeType, psz) == 0)
14                         {
15                             *clsidEncoder = pici->Clsid;
16                             f = 1;
17                             break;
18                         }
19                         pici++;
20                     }
21                 }
22                 GlobalFree(pici);
23             }
24             _Lr(psz);
25             return f;
26         }

 1         static int GetImageLength(GpImage* image, string format, void** usize)
 2         {
 3             CLSID clsid;
 4             if (GetEncoderClsid(format, &clsid) != 0)
 5             {
 6                 void* hgbl = GlobalAlloc(GMEM_MOVEABLE, null);
 7                 if (hgbl != null)
 8                 {
 9                     void* pstm;
10                     if (SUCCEEDED(CreateStreamOnHGlobal(hgbl, 1, &pstm)))
11                     {
12                         if (GdipSaveImageToStream(image, pstm, &clsid, null) == 0)
13                         {
14                             *usize = GlobalSize(hgbl);
15                             return 1;
16                         }
17                         Marshal.Release((IntPtr)pstm);
18                     }
19                     GlobalFree(hgbl);
20                 }
21             }
22             return 0;
23         }