An ASP Component to Send Arbitary Large File from Server to Client

#define RETURN { hr = E_FAIL; goto Cleanup; } // don't kill me! Look at last examples of MS // under // You can't catch me! :-) STDMETHODIMP CGetFile::GetFile(VARIANT vFileName) { _variant_t vReturnBuffer; LPSAFEARRAY psaFile; HANDLE hFile; DWORD dwSizeOfFile; DWORD dwNumberOfBytesRead; BOOL bResult; unsigned char *pReturnBuffer = NULL; long k; HRESULT hr = S_OK; // Create file in this case only OPENS an existing file (or fails // if the file does not exist!) hFile = ::CreateFile( vFileName.bstrVal, // name of the file GENERIC_READ, // desired access FILE_SHARE_READ, // shared access NULL, // security attributes OPEN_EXISTING, // creation disposition - open only if existing! FILE_FLAG_SEQUENTIAL_SCAN, // flag attributes NULL ); if( hFile == INVALID_HANDLE_VALUE ) { return E_FAIL; } dwSizeOfFile = ::GetFileSize( hFile, NULL ); if (dwSizeOfFile == 0xFFFFFFFF) { return E_FAIL; } try { pReturnBuffer = new unsigned char[dwSizeOfFile]; } catch( std::bad_alloc& ) { return E_FAIL; } // Get the binary content of the file bResult = ::ReadFile( hFile, pReturnBuffer, dwSizeOfFile, &dwNumberOfBytesRead, NULL ); if( FALSE == bResult ) { RETURN(E_FAIL); } psaFile = ::SafeArrayCreateVector( VT_UI1 /*unsigned char*/, 0, dwSizeOfFile ); if( !psaFile ) { RETURN(E_FAIL); } // Fill in the SAFEARRAY with the binary content of the file for( k = 0; k < (int) dwSizeOfFile; k++ ) { if( FAILED(::SafeArrayPutElement( psaFile, &k, &pReturnBuffer[k] )) ) { RETURN(E_FAIL); } } vReturnBuffer.vt = VT_ARRAY | VT_UI1; V_ARRAY(&vReturnBuffer) = psaFile; m_piResponse->BinaryWrite(vReturnBuffer); Cleanup: if( pReturnBuffer ) delete [] pReturnBuffer; return SUCCEEDED(hr) ? S_OK : E_FAIL; } As you see, the idea is simple: to read the binary content of the file, to pack it into safearray and then to pass as a parameter to IResponse::BinaryWrite(). The process is pretty straightforward

Download source and demo project - 62 KB


  • I have source code.

    Posted by Legacy on 09/10/2002 12:00am

    Originally posted by: CSConcordia

    send me mail, I give you the source code.

  • Where is the Source Code????

    Posted by Legacy on 08/06/2002 12:00am

    Originally posted by: Djay

    The artice was an interesting one... But I was not able to download the Source Code of ur article, Do tell me or send me the Source code.

  • want to code

    Posted by Legacy on 07/17/2002 12:00am

    Originally posted by: Zafar Asghar

    respected sir
    i am doing my project of asp and that is "online jobs" . i am confuse what to do please help me. i am waiting for your reply plz guide me.i am waiting for you.

    ok bye

  • Where is the Source Code

    Posted by Legacy on 03/06/2002 12:00am

    Originally posted by: Dion

    I am trying to do the same thing but when I click on the link to download the zip file, the page could not be found.

    Can you send me the Zip file with the source and project?


  • Help me~~~

    Posted by Legacy on 02/12/2002 12:00am

    Originally posted by: James

    This source does not work properly...

    Microsoft VBScript RunTime error '800a01fb'

    Exception : 'GetFile'



    please help me...

  • Where is the source code?

    Posted by Legacy on 12/14/2001 12:00am

    Originally posted by: Carlos

    The link is bad!

  • source code

    Posted by Legacy on 11/06/2001 12:00am

    Originally posted by: dennis

    source code

  • perfect .

    Posted by Legacy on 10/20/2001 12:00am

    Originally posted by: abdallah


  • How do I register the IResponse class?

    Posted by Legacy on 09/06/2001 12:00am

    Originally posted by: doug w

    Apparently the IResponse object is intrinsic. The object is created and destroyed upon opening and closing each ASP page. An example of how to initialize this type of object can be found in the MSDN Library by searching for "Developing Active Server Components with ATL". It took about 2 hours of searching, and about 30 minutes of reading, but the document is very straight forward. I hope this helps anyone else that decides to use this function.


  • Source code please?

    Posted by Legacy on 09/06/2001 12:00am

    Originally posted by: doug w

    Fix the source code link please.

  • Loading, Please Wait ...

Leave a Comment
  • Your email address will not be published. All fields are required.

Top White Papers and Webcasts

  • Enterprises are increasingly looking to platform as a service (PaaS) to lower their costs and speed their time to market for new applications. Developing, deploying, and managing applications in the cloud eliminates the time and expense of managing a physical infrastructure to support them. PaaS offerings must deliver additional long-term benefits, such as a lower total cost of ownership (TCO), rapid scalability, and ease of integration, all while providing robust security and availability. This report …

  • Anthony Christie, the Chief Marketing Officer for Level Communications, is responsible for customer experience, worldwide marketing and product management. In this informative asset, he shares his insights into why a private network connection to cloud-bases applications is the right decision for your enterprise. Download now to find out more.

Most Popular Programming Stories

More for Developers

RSS Feeds

Thanks for your registration, follow us on our social networks to keep up-to-date