[收藏]IPicture::SaveAsFile的一个使用例子

天云上人

  BOOL CPicture::SaveAsBitmap(CString sFilePathName)
) W5 E' ]" @- `& y9 I& K//=============================================================================
{
BOOL bResult = FALSE;
- N+ z5 ~( o* P+ @  p* o7 y5 B ILockBytes *Buffer = 0;
6 [5 h5 c; r  b" I) x% i1 q IStorage   *pStorage = 0;
IStream    *FileStream = 0;
BYTE    *BufferBytes;
5 X+ @, n% p5 g6 \ STATSTG  BytesStatistics;
$ H2 h+ p1 `* G+ d" k9 h DWORD  OutData;
long  OutStream;
CFile  BitmapFile; CFileException e;
double  SkipFloat = 0;
) t) I. b% V! Z/ j DWORD  ByteSkip = 0;
_ULARGE_INTEGER RealData;



CreateILockBytesOnHGlobal(NULL, TRUE, &Buffer); // Create ILockBytes Buffer



HRESULT hr = ::StgCreateDocfileOnILockBytes(Buffer,
  d  F3 a. t4 ?* Q# ^5 n     STGM_SHARE_EXCLUSIVE | STGM_CREATE | STGM_READWRITE, 0, &pStorage);



hr = pStorage->CreateStream(LPICTURE,
  STGM_SHARE_EXCLUSIVE | STGM_CREATE | STGM_READWRITE, 0, 0, &FileStream);

3 u" f5 I: r2 J: d: l8 }
) o& w. r' w% p, L
m_pPict->SaveAsFile(FileStream, TRUE, &OutStream); // Copy Data Stream
# x, x& l; E5 h. ~  z- k FileStream->Release();
pStorage->Release();
6 m8 n/ t. z9 p* ^  k% ] Buffer->Flush();
- a9 J* l8 J, k3 {


// Get Statistics For Final Size Of Byte Array
5 g: Z& A( V# G  _! D Buffer->Stat(&BytesStatistics, STATFLAG_NONAME);


' e  d8 o5 [$ c$ i" z1 y
// Cut UnNeeded Data Coming From SaveAsFile() (Leave Only Pure Picture Data)
SkipFloat = (double(OutStream) / 512); // Must Be In a 512 Blocks...
) d: Y+ d$ N* h7 s+ v if(SkipFloat > DWORD(SkipFloat)) ByteSkip = (DWORD)SkipFloat + 1;
! K6 P% h& q  o& F* o else ByteSkip = (DWORD)SkipFloat;
& C3 ^: H6 H# z2 o' W ByteSkip = ByteSkip * 512; // Must Be In a 512 Blocks...

// Find Difference Between The Two Values
9 U3 B0 x  {4 F% Q ByteSkip = (DWORD)(BytesStatistics.cbSize.QuadPart - ByteSkip);


" {  E" a% y! g& u) x  V
// Allocate Only The Pure Picture Data
RealData.LowPart = 0;
# I" b+ W+ _; i" Q/ h: @, s RealData.HighPart = 0;
9 w# l4 `+ F8 O, A RealData.QuadPart = ByteSkip;
BufferBytes = (BYTE*)malloc(OutStream);
' z+ y, {2 G9 t+ M' B if(BufferBytes == NULL)
  {
4 @) A7 y+ f# k% w1 {  Buffer->Release();
9 b5 B" u% W, a7 Q& m8 c, E  HWND hWnd = AfxGetApp()->GetMainWnd()->m_hWnd;
  MessageBoxEx(hWnd, Can not allocate enough memory\\t, ERROR_TITLE, MB_OK | MB_ICONSTOP, LANG_ENGLISH);
  }



- p  E. |: K: ~2 j, x Buffer->ReadAt(RealData, BufferBytes, OutStream, &OutData);


" b( w" ?/ q$ D
if(BitmapFile.Open(sFilePathName, CFile::typeBinary | CFile::modeCreate | CFile::modeWrite, &e))
  {
* b7 J8 {5 y3 s* J/ |( ]  BitmapFile.Write(BufferBytes, OutData);
  BitmapFile.Close();
" c) m8 W2 S7 Z4 J- J  e  bResult = TRUE;
  }
else // Write File Failed...
  {
, p6 b; t3 ]8 a2 ^4 `7 J  TCHAR szCause[255];
  e.GetErrorMessage(szCause, 255, NULL);
  HWND hWnd = AfxGetApp()->GetMainWnd()->m_hWnd;
. g/ V3 @# u) r6 [& q  MessageBoxEx(hWnd, szCause, ERROR_TITLE, MB_OK | MB_ICONSTOP, LANG_ENGLISH);
8 s  U; R+ l( U* f8 l7 J/ H7 U  bResult = FALSE;
; p( a# M- g: M* u# G# X  }
+ j8 i* }+ n- W
/ `$ S6 o+ l$ t$ v Buffer->Release();
free(BufferBytes);



return(bResult);
}