LAnnTextPointer::ChangeUserHandle

#include "ltwrappr.h"

virtual L_INT LAnnTextPointer::ChangeUserHandle(nIndex, pAnnHandle)

L_INT32 nIndex;	index of the user handle to change
pANNHANDLE pAnnHandle;	pointer to a structure that defines how to change the user handle

Changes properties of an existing user-defined annotation handle.

Parameter	Description
nIndex	Index of the user handle to change. This index is zero-based.
pAnnHandle	Pointer to a structure that defines how to change the user handle.

Returns

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 LAnnTextPointer::AddUserHandle and LAnnTextPointer::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.

Platforms

Win32, x64.

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 // * Displays the hour glass cursor when mouse over the handle 
L_INT LAnnTextPointer_ChangeUserHandleExample(LAnnTextPointer *LTextPointer) 
{ 
   L_INT nRet; 
   L_UINT uCount; 
   ANNHANDLE AnnHandle; 
   // Get the total count of user handles 
   LTextPointer->GetUserHandles(NULL, &uCount); 
   if (uCount > 0) 
   { 
      memset(&AnnHandle, 0, sizeof(ANNHANDLE)); 
      AnnHandle.uStructSize = sizeof(&AnnHandle); 
      nRet = LTextPointer->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 = LTextPointer->ChangeUserHandle(0, &AnnHandle); 
      if(nRet != SUCCESS) 
         return nRet; 
   } 
   else 
   { 
      MessageBox(NULL, TEXT("No User Handles!"), TEXT("Error"), MB_OK); 
      return FAILURE; 
   } 
   return SUCCESS; 
}

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Summary of Features

Functions:	Class Members, LAnnTextPointer::AddUserHandle, LAnnTextPointer::EnumerateHandles, LAnnTextPointer::EnumHandleCallBack, LAnnTextPointer::GetUserHandle, LAnnTextPointer::GetUserHandles, LAnnTextPointer::DeleteUserHandle
Topics:	Annotation Functions: Object Properties
	Implementing Annotations
	Automated User Interface for Annotations
	Annotation Functions: Creating and Deleting Annotations
	Types of Annotations
	Annotation Functions: Implementing Custom Annotations
	Fixed Annotations
	Minimizing Flicker With Double Buffering