Re: how to use freeimage

From:

Aegis Delacour <eloquent1@gmail.com>

Newsgroups:

microsoft.public.vc.language

Date:

Thu, 3 Sep 2009 00:47:56 -0700 (PDT)

Message-ID:

<e2fd68f7-99d8-418f-abf0-8f827a32befa@2g2000prl.googlegroups.com>

oops, well heres the thing..i need to display a .jpg in fullscreen
but the image will be the entire screens size. I have finished the
screenshot function. Now i need to just display it and thats it.

I did some research and found this but i do get a few errors. Maybe
someone can debug it? or perhaps theres an easier way to do this. I
have commented exactly where the errors are.

C:\Documents and Settings\Administrator\Desktop\Copy of Lower EICAS
(240709)\LowerEicasDlg.cpp(27050) : error C2660: 'GetDC' : function
does not take 1 parameters
C:\Documents and Settings\Administrator\Desktop\Copy of Lower EICAS
(240709)\LowerEicasDlg.cpp(27057) : error C2065: 'HIMETRIC_INCH' :
undeclared identifier
C:\Documents and Settings\Administrator\Desktop\Copy of Lower EICAS
(240709)\LowerEicasDlg.cpp(27060) : error C2660: 'GetClientRect' :
function does not take 2 parameters
C:\Documents and Settings\Administrator\Desktop\Copy of Lower EICAS
(240709)\LowerEicasDlg.cpp(27064) : error C2660: 'ReleaseDC' :
function does not take 2 parameters

void CLowerEicasDlg::LoadPictureFile(LPCTSTR szFile, HWND hWnd)
{
LPPICTURE gpPicture = 0;
  // open file
  HANDLE hFile = CreateFile(szFile, GENERIC_READ, 0, NULL,
OPEN_EXISTING, 0, NULL);
  _ASSERTE(INVALID_HANDLE_VALUE != hFile);

  // get file size
  DWORD dwFileSize = GetFileSize(hFile, NULL);
  _ASSERTE(-1 != dwFileSize);

  LPVOID pvData = NULL;
  // alloc memory based on file size
  HGLOBAL hGlobal = GlobalAlloc(GMEM_MOVEABLE, dwFileSize);
  _ASSERTE(NULL != hGlobal);

  pvData = GlobalLock(hGlobal);
  _ASSERTE(NULL != pvData);

  DWORD dwBytesRead = 0;
  // read file and store in global memory
  BOOL bRead = ReadFile(hFile, pvData, dwFileSize, &dwBytesRead,
NULL);
  _ASSERTE(FALSE != bRead);
  GlobalUnlock(hGlobal);
  CloseHandle(hFile);

  LPSTREAM pstm = NULL;
  // create IStream* from global memory
  HRESULT hr = CreateStreamOnHGlobal(hGlobal, TRUE, &pstm);
  _ASSERTE(SUCCEEDED(hr) && pstm);

  // Create IPicture from image file
  if (gpPicture)
    gpPicture->Release();
  hr = ::OleLoadPicture(pstm, dwFileSize, FALSE, IID_IPicture, (LPVOID
*)&gpPicture);
  _ASSERTE(SUCCEEDED(hr) && gpPicture);
  pstm->Release();

  /** Painting part added to make it into one function **/

  // Retrieve dc
  HDC hdc = GetDC( hWnd ); //error1
  long hmWidth = 0;
  long hmHeight = 0;
  gpPicture->get_Width(&hmWidth);
  gpPicture->get_Height(&hmHeight);

  // convert himetric to pixels
  int nWidth = MulDiv(hmWidth, GetDeviceCaps(hdc, LOGPIXELSX),
HIMETRIC_INCH); //error2
  int nHeight = MulDiv(hmHeight, GetDeviceCaps(hdc, LOGPIXELSY),
HIMETRIC_INCH);
  RECT rc;
  GetClientRect(hWnd, &rc); //error3

  // display picture using IPicture::Render
  gpPicture->Render(hdc, 0, 0, nWidth, nHeight, 0, hmHeight, hmWidth, -
hmHeight, &rc);
  ReleaseDC( hWnd, hdc ); //error4
  gpPicture->Release();

  /** End Painting Part **/
}