IltmmWMScript HeaderScripts Example for C

This example shows how to add and remove header scripts from a convert graph.

#define MAKE_MEDIA_PATH(pFileName) (TEXT("C:\\LEADTOOLS 20\\Media\\")TEXT(pFileName)) 
void IltmmWMScript_HeaderScripts_Example(IltmmConvert* pConvert) 
{ 
   HRESULT hr = S_OK; 
   IUnknown *punk; 
   IltmmWMScript *pWMScript; 
    
   // source and target path names 
   BSTR bstrSource = SysAllocString(MAKE_MEDIA_PATH("source.avi")); 
   BSTR bstrTarget = SysAllocString(MAKE_MEDIA_PATH("source_script.wmv")); 
    
   // set the source, target and WMV target formats for our conversion 
   IltmmConvert_put_SourceFile(pConvert, bstrSource); 
   IltmmConvert_put_TargetFile(pConvert, bstrTarget); 
   IltmmConvert_put_TargetFormat(pConvert, ltmmConvert_TargetFormat_WMV_Mux); 
    
   // free the BSTRs 
   SysFreeString(bstrSource); 
   SysFreeString(bstrTarget); 
    
   // get the target object 
   IltmmConvert_GetSubObject(pConvert, ltmmConvert_Object_TargetFilter, &punk); 
   if (punk) 
   { 
      // get the WMScript object 
      IUnknown_QueryInterface(punk, &IID_IltmmWMScript, (void**)&pWMScript); 
      if (pWMScript) 
      { 
         double duration; 
         long lScriptCnt; 
         WCHAR szTemp[128]; 
         double scriptTime; 
         BSTR bstrScriptType, bstrScriptCmd; 
          
         // turn off stream scripts and remove any header scripts 
         IltmmWMScript_put_EnableScriptStream(pWMScript, VARIANT_FALSE); 
         IltmmWMScript_RemoveAllHeaderScripts(pWMScript); 
          
         // get the source duration 
         hr = IltmmConvert_get_Duration(pConvert, &duration); 
         if (FAILED(hr)) 
            duration = 0.5 ;//assume a relatively small duration 
 
         // create a sample header script (type of caption) and set it to execute @ 0 secs 
         // we will delete this one later for demonstation purposes 
         scriptTime = 0.; 
         swprintf_s(szTemp, _countof(szTemp), L"Sample caption script at %g seconds", scriptTime); 
         bstrScriptCmd = SysAllocString(szTemp); 
          
         // add the header script 
         hr = IltmmWMScript_AddHeaderScript(pWMScript, L"caption", bstrScriptCmd, scriptTime); 
          
         // free the bstr 
         SysFreeString(bstrScriptCmd); 
          
         // create a sample header script (type of caption) and set it to execute @ duration / 2 
         scriptTime = duration/2.0; 
         swprintf_s(szTemp, _countof(szTemp), L"Sample caption script at %g seconds", scriptTime); 
         bstrScriptCmd = SysAllocString(szTemp); 
          
         // add the header script 
         hr = IltmmWMScript_AddHeaderScript(pWMScript, L"caption", bstrScriptCmd, scriptTime); 
          
         // free the bstr 
         SysFreeString(bstrScriptCmd); 
          
         // now get the header script count, should be 2 from above 
         hr = IltmmWMScript_get_HeaderScriptCount(pWMScript, &lScriptCnt); 
         if (SUCCEEDED(hr) && lScriptCnt>0) 
         { 
            long i; 
            // iterate through the script indexes 
            for (i=0; i<lScriptCnt; i++) 
            { 
               if (i==0) // if first one, delete it (demonstration purposes) 
               { 
                  IltmmWMScript_RemoveHeaderScript(pWMScript, i); 
               } 
               else if (i==1) // if second one, just get it and display a msg box with properties 
               { 
                  hr = IltmmWMScript_GetHeaderScript(pWMScript, i, &bstrScriptType, &bstrScriptCmd, &scriptTime); 
                  if (SUCCEEDED(hr)) 
                  { 
                     WCHAR szTemp[255]; 
                     swprintf_s(szTemp, _countof(szTemp), L"type: %s\ncmd: %s\ntime: %g", bstrScriptType, bstrScriptCmd, scriptTime); 
                     MessageBox(NULL, szTemp, L"Script Properties", MB_OK); 
                      
                     // free the bstrs 
                     SysFreeString(bstrScriptType); 
                     SysFreeString(bstrScriptCmd); 
                  } 
               } 
            } 
         } 
         IUnknown_Release(pWMScript); 
      } 
       
      // if all is well, run the convert now 
      if (SUCCEEDED(hr)) 
         hr = IltmmConvert_StartConvert(pConvert); 
       
      IUnknown_Release(punk); 
   } 
} 

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