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LAnnCurve::GetUserHandle

Summary

Gets information about the specified user-defined annotation handle.

Syntax

#include "ltwrappr.h"

virtual L_INT LAnnCurve::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 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 Curve 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
For a listing of the exact DLLs and Libraries needed, 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 LAnnCurve_GetUserHandleExample(LAnnCurve *LCurve) 
{ 
   L_INT nRet; 
 
   L_UINT uCount;  
 
   ANNHANDLE AnnHandle;  
 
 
 
   // Get the total count of user handles 
 
   nRet = LCurve->GetUserHandles(NULL, &uCount);  
   if(nRet != SUCCESS) 
      return nRet; 
 
   if (uCount > 0)  
   { 
 
      memset(&AnnHandle, 0, sizeof(ANNHANDLE));  
 
      AnnHandle.uStructSize = sizeof(&AnnHandle);  
 
      nRet = LCurve->GetUserHandle(0, &AnnHandle);  
      if(nRet != SUCCESS) 
         return nRet; 
 
      DumpAnnHandle(0, &AnnHandle);  
 
   } 
   else 
   { 
      MessageBox(NULL, TEXT("No User Handles!"), TEXT("Error"), MB_OK);  
      return nRet; 
   } 
 
   return SUCCESS; 
}