In This Topic ▼

LAnnLine::ChangeUserHandle

#include "ltwrappr.h"

virtual L_INT LAnnLine::ChangeUserHandle(nIndex, pAnnHandle)

Changes properties of an existing user-defined annotation handle.

Parameters

L_INT32 nIndex

Index of the user handle to change. This index is zero-based.

pANNHANDLE pAnnHandle

Pointer to a structure that defines how to change the user handle.

Returns

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

Comments

Use this function to change the properties of an existing user-defined annotation handle.

This function is used in conjunction with the LAnnLine::AddUserHandle and LAnnLine::EnumerateHandles functions.

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.

Example

// This example changes the first user handle of an object by // * Moving handle ten pixels to the left // * Changing color of handle to blue // * Changing shape of handle to square // * Displaying the hour glass cursor when mouse over the handle

L_INT LAnnLine_ChangeUserHandleExample(LAnnLine *LLine)  
{ 
   L_INT nRet; 
   L_UINT uCount;  
   ANNHANDLE AnnHandle;  
 
   // Get the total count of user handles 
   nRet = LLine->GetUserHandles(NULL, &uCount);  
   if(nRet != SUCCESS) 
      return nRet; 
   if (uCount > 0)  
   { 
      memset(&AnnHandle, 0, sizeof(ANNHANDLE));  
      AnnHandle.uStructSize = sizeof(&AnnHandle);  
      nRet = LLine->GetUserHandle(0, &AnnHandle);  
      if(nRet != SUCCESS) 
         return nRet; 
       
      AnnHandle.aptContainer.x +=10;  
      AnnHandle.crFill = RGB(0,0,255);  
      AnnHandle.nShape = ANNHANDLE_SHAPE_SQUARE;  
      AnnHandle.hCursor = LoadCursor(NULL,IDC_APPSTARTING);  
      AnnHandle.uFlags = ANNHANDLE_FILL_COLOR | ANNHANDLE_SHAPE | ANNHANDLE_LOCATION | ANNHANDLE_CONTAINER_COORDINATES;  
      nRet = LLine->ChangeUserHandle(0, &AnnHandle);  
      if(nRet != SUCCESS) 
         return nRet; 
   } 
   else 
   { 
      MessageBox(NULL, TEXT("No User Handles!"), TEXT("Error"), MB_OK);  
      return FAILURE; 
   } 
   return SUCCESS; 
}