Why is the exception thrown on memcpy using during copying LPBYTE to LPTSTR (clipboard)?

Posted by user46503 on Stack Overflow See other posts from Stack Overflow or by user46503
Published on 2010-06-05T00:27:37Z Indexed on 2010/06/08 5:42 UTC
Read the original article Hit count: 258

Filed under:

c++

|

memcpy

|

lptstr

Hello, I have a LPBYTE array (taken from file) and I need to copy it into LPTSRT (actually into the clipboard). The trouble is copying work but unstable, sometime an exception was thrown (not always) and I don't understand why. The code is:

     FILE *fConnect = _wfopen(connectFilePath, _T("rb"));
  if (!fConnect)
   return;
  fseek(fConnect, 0, SEEK_END);
  lSize = ftell(fConnect);
  rewind(fConnect);

  LPBYTE lpByte = (LPBYTE) malloc(lSize);  
  fread(lpByte, 1, lSize, fConnect); 
  lpByte[lSize] = 0;
  fclose(fConnect);

  //Copy into clipboard
  BOOL openRes = OpenClipboard(NULL);
  if (!openRes)
   return;
  DWORD err = GetLastError();

  EmptyClipboard(); 
  HGLOBAL hText;
  hText = GlobalAlloc(GMEM_MOVEABLE, (lSize+ sizeof(TCHAR)));

  LPTSTR sMem = (TCHAR*)GlobalLock(hText); 
  memcpy(sMem, lpByte, (lSize + sizeof(TCHAR)));

The last string is the place where the exception is thrown. Thanks a lot

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