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vdig capture directly: VDGetImageDescription() problem

Hi  everyone

   If  get vdig from SGGetVideoDigitizerComponent(), I can call VDGetImageDescription() to  get image desc correctly.(NOTE: I must call SGPrepare() ,otherWise VDGetImageDescription() function won't work.  I don't know why, this is QUESTION 1.).
If I open vdig component directly, VDGetImageDescription() function won't work. My code is posted below:
1. open
FindNextComponent(), OpenComponent();
2. configure vdig
VDSetInput(vdigComponent,3); // selected input index is 3.
VDSetInputStandard(vdigComponent,ntscIn); 
VDGetMaxSrcRect(vdigComponent,3,&maxSrcRect); 
VDSetDigitizerRect(vdigComponent,&maxSrcRect);
VDSetTimeBase(vdigComponent,NewTimeBase()); 
VDSetCompressionOnOff(vdigComponent,FALSE);
VDGetImageDescription(vdigComponent,imgHandle);  // PROBLEM!!!!
//  when the code runs here, it is hung up, GDB Debugger is lauched. It appears that VDGetImageDescription() function can not return.  MY Question is that Is the order that I configure the vdig  incorrect or I miss some necessary settings. This is QUESTION 2.
BTW: I don't use seqGrab component and its video channel ,  I want to get video device list directly without SGGetChannelDeviceList() , is this possible?  This is QUESTION3.

any help would  be appreciated!  Thank you very much!


 

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