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LAnnVideo::GetUserHandle

Summary

Gets information about the specified user-defined annotation handle.

Syntax

#include "ltwrappr.h"

virtual L_INT LAnnVideo::GetUserHandle(uIndex, pAnnHandle)

Parameters

L_INT32 uIndex

Index of user handle to get. The index is zero based. Passing a negative value returns ERROR_INV_PARAMETER.

pANNHANDLE pAnnHandle

Pointer to a structure to be updated with the user handle.

Returns

Value	Meaning
SUCCESS	The function was successful.
< 1	An error occurred. Refer to Return Codes.

Comments

Before calling this function, you must create the Video annotation object.

Call this function to get information about an existing user-defined annotation handle.

If successful, the entire pAnnHandle structure is filled. The pAnnHandle->uFlags field is ignored. For more information, refer to ANNHANDLE.

Required DLLs and Libraries

LTANN
LTMM
For a listing of the exact DLLs and Libraries needed for LTANN, based on the toolkit version, refer to Files To Be Included With Your Application.
For a listing of the exact DLLs and Libraries needed for LTMM, based on the toolkit version, refer to Files To Be Included With Your Application.

Platforms

Win32, x64.

Example

// This example displays information about the first user handle in an annotation object

static L_VOID DumpAnnHandle(L_UINT uIndex, pANNHANDLE pAnnHandle)  
{ 
 
   L_TCHAR szMsg[400];  
 
   if (pAnnHandle)  
   { 
      wsprintf(szMsg, TEXT("uIndex %d\nuStructSize: %d\nnID: %d\n aptContainer[%f,%f]\nptClient[%d,%d]\nbVisible: %s\ncrPen: 0x%x\ncrFill: 0x%x\nnShape: %s\nhCursor: %s\n"), 
					uIndex,  
					pAnnHandle->uStructSize,   
					pAnnHandle->nID,  
					pAnnHandle->aptContainer.x, pAnnHandle->aptContainer.y,  
					pAnnHandle->ptClient.x,     pAnnHandle->ptClient.y,  
					pAnnHandle->bVisible ? TEXT("Visible") : TEXT("Not Visible"), 
					pAnnHandle->crPen,  
					pAnnHandle->crFill,  
					pAnnHandle->nShape == ANNHANDLE_SHAPE_SQUARE ? TEXT("Square") : TEXT("Circle"), 
					pAnnHandle->hCursor ? TEXT("Cursor") : TEXT("No Cursor") 
					);  
 
      MessageBox(NULL, szMsg, TEXT(""), MB_OK);  
 
   } 
 
} 
 
L_INT LAnnVideo_GetUserHandleExample(LAnnVideo *LVideo)  
{ 
	L_INT nRet; 
   L_UINT uCount;  
   ANNHANDLE AnnHandle;  
 
   // Get the total count of user handles 
   nRet = LVideo->GetUserHandles(NULL, &uCount);  
	if(nRet != SUCCESS) 
		return nRet; 
   if (uCount > 0)  
   { 
      memset(&AnnHandle, 0, sizeof(ANNHANDLE));  
      AnnHandle.uStructSize = sizeof(&AnnHandle);  
      nRet = LVideo->GetUserHandle(0, &AnnHandle);  
		if(nRet != SUCCESS) 
			return nRet; 
      DumpAnnHandle(0, &AnnHandle);  
   } 
   else 
	{ 
      MessageBox(NULL, TEXT("No User Handles!"), TEXT("Error"), MB_OK);  
		return FAILURE; 
	} 
	return SUCCESS; 
}