Missing WMCreateWriter in wmvcore.lib

Missing WMCreateWriter in wmvcore.lib

• Lance77035

  As I have indicated in my posts, WMCreateWriter is exported from the DLL, but missing from the wmvcore.lib library, which is the problem.

  If you search the samples, you will see that none of them call WMCreateWriter - the only file where it's referenced is wmsdkidl.h.

  Please, take look at wmvcore.lib and wmsdkidl.h before replying.

   

  
  

• Feliner

  WMCreateWriter() is an ActiveX method. ActiveX methods don't get exported from a DLL, you invoke them through a COM class object which is created by DllGetClassObject. Start reading here.
  
  
  
  
  

• Pedro Costa

  I just happen to know some of the convoluted history of the DShow SDK. :-)

  I'm not sure about the Format SDK issue you're seeing, but I'll see if I can track down an answer.

  ----------------------------------------------------------------------------
  Mike Wasson, DirectShow SDK Documentation
  This posting is provided "AS IS" with no warranties, and confers no rights. You assume all risk for your use.

  (c) 2006 Microsoft Corporation. All rights reserved.

  
  
  

• Prateek_cds

  Really WMCreateWriter is declared in wmsdkidl.h as

  HRESULT STDMETHODCALLTYPE WMCreateWriter( IUnknown* pUnkCert, IWMWriter **ppWriter );

  , documented as such:

  http://msdn.microsoft.com/library/default.asp url=/library/en-us/wmform95/htm/wmcreatewriter.asp

  ,and exported from wmvcore.dll:

  Microsoft (R) COFF/PE Dumper Version 8.00.50727.42
  Copyright (C) Microsoft Corporation. All rights reserved.
  
  Dump of file c:\winnt\system32\wmvcore.dll
  
  File Type: DLL
  
   Section contains the following exports for WMVCore.DLL
  
    ordinal hint RVA   name
  
       8  0 00021EEA DllRegisterServer
       1  1 0002E9D1 WMCheckURLExtension
       2  2 0002EA56 WMCheckURLScheme
       9  3 000FB05E WMCreateBackupRestorer
       3  4 000FAFEB WMCreateBackupRestorerPrivate
       10  5 000F1A1B WMCreateEditor
       11  6 000F8E32 WMCreateIndexer
       4  7 000FB68F WMCreateLicenseRevocationAgentPrivate
       12  8 000D5ED5 WMCreateProfileManager
       13  9 00022DE8 WMCreateReader
       14  A 00022D43 WMCreateReaderPriv
       15  B 0002B562 WMCreateSyncReader
       5  C 0002B501 WMCreateSyncReaderPriv
       16  D 000854AD WMCreateWriter
       17  E 0009F355 WMCreateWriterFileSink
       18  F 000A1049 WMCreateWriterNetworkSink
       19  10 00085457 WMCreateWriterPriv
       20  11 000AAD51 WMCreateWriterPushSink
       6  12 0003570F WMIsAvailableOffline
       21  13 00023117 WMIsContentProtected
       7  14 0002E925 WMValidateData

  Anybody else cares to comment
  

• nub340

  It's Windows Server 2003 SP1 SDK (v3790.1830)
  

• Edward__

  1. I don't see WMVCopy among the samples. Can you please provide a complete path to this sample When quoting, please make sure that you are quoting a path from a fresh PSDK installation to avoid any leftovers from previous SDK's. Thanks

  2. I don't understand why is it so hard to look at the library that is documented as the one that is supposed to have WMCreateWriter exported and it does not. It really is simple - a) check the docs (they say wmvcore.lib has WMCreateWriter exported), b) check the library (there is no WMCreateWriter), c) check the header (where WMCreateWriter's prototype is listed).

  
  

• n0n4m3

  Also tried the R2 release - same effect. Here's the list of exports from wmvcore.lib:

   WMCheckURLExtension@@YGJPBG@Z
   WMCreateBackupRestorerPrivate@@YGJPAUIUnknown@@PAPAUIWMLicenseBackup@@@Z
   WMValidateData@@YGJPAEPAK@Z
  _WMCreateEditor@4
  _WMCreateIndexer@4
  _WMCreateProfileManager@4
  _WMCreateReaderPriv@4
  _WMCreateWriterFileSink@4
  _WMCreateWriterNetworkSink@4
  _WMCreateWriterPriv@4

  
  

• Gaoqiang

  I have code that was working and now it appears that there is no way to compile/link this code. Can you (i.e. MS) just post the import library for now, so that people like myself would be able to at least build our existing code until you sort out this issue

  BTW, this looks like a blunder on MS' part. How can one forget to ship a library

  
  

• SParker

  I'm looking at the version of wmvcore.dll that comes with Windows Vista Beta 2, and I see that WMCreateWriter is exported from wmvcore.dll; it's ordinal 16.

  I might recommend trying to build the various PSDK samples for wmvcore, such as wmvcopy; if that works and runs, then try to follow what it does in terms of linking. It's possible that you're just not linking in the right libs.

  Hope that helps, and good luck!

  Becky

  
  
  

• Mitesh Shah923

  Finally, a reply by someone who knows something about the topic.

  Here's the problem, though - when I'm trying to install Windows Media Format SDK, I get an error dialog right at the beginning that informs me that this SDK may only be installed on WinXP (I'm running a Win2K3) and then the installer exits.

  
  

• rdkelly

  Can you tell me the version of the PSDK you are seeing this issue in

  Sumedh

  
  

• js06

  Well, I didn't realize this, but the Format SDK is not supported on Server 2003:

  http://msdn.microsoft.com/library/en-us/wmform95/htm/sdkversions.asp

  The next version which is currently in beta will be supported for XP and Vista only. I apologize for not confirming that fact before I pointed you to the Format SDK download.

  Mike

  ----------------------------------------------------------------------------
  Mike Wasson, DirectShow SDK Documentation
  This posting is provided "AS IS" with no warranties, and confers no rights. You assume all risk for your use.

  (c) 2006 Microsoft Corporation. All rights reserved.

  
  

  
  
  

• anukirthi

  Among the code samples that your SDK, you should see a sample called WMVCopy, and this one calls WMCreateWriter. Do you see it If you do, can you try building it

  
  
  

• elfenland

  You're right, there is an old version of wmvcore.lib in the DirectShow samples directory (under Samples\Multimedia\DirectShow\Common). That version does not export WMCreateWriter.

  Apparently that file was originally shipped in the DirectX SDK to make a couple of the DShow samples build without needing to install the Windows Media Format SDK. When DShow was moved to the PSDK, that file was carried over. But as far as I can tell, none of the DShow samples in the PSDK actually link to that file, so it should probably have been removed from the PSDK.

  In any case, you can get the correct version of wmvcore.lib by installing the Format SDK 9.5 from http://msdn.microsoft.com/windowsmedia/downloads/.

  Or you can install the Vista B2 PSDK, which has all of the latest Format SDK headers/libs.

  ----------------------------------------------------------------------------
  Mike Wasson, DirectShow SDK Documentation
  This posting is provided "AS IS" with no warranties, and confers no rights. You assume all risk for your use.

  (c) 2006 Microsoft Corporation. All rights reserved.

  
  
  
• Missing WMCreateWriter in wmvcore.lib