#include "ltwrappr.h"

virtual L_INT LVectorChord::LockObject(pChord)

Gets the object information of the class object.



Pointer to a VECTORCHORD structure to be updated with the vector object information.


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


This function is used to retrieve the object information of the class object.

To use this method, declare a variable of the VECTORCHORD type and pass the address to this function. After modifying the vector object settings, call LVectorChord::UnlockObject (). LVectorChord::LockObject () and LVectorChord::UnlockObject () should always be called in pairs.

Before an object has been added to the LVectorBase object, using LVectorBase::AddObject or LVectorLayer::AddObject, LVectorChord::UnlockObject() can be used to change ALL properties of an object. However, once the object has been added to the LVectorBase object, some properties cannot be changed using LVectorChord::UnlockObject ().However, as long as the number of points does not change, the coordinates of the individual points can always be modified using LVectorChord::UnlockObject ().

To change the object information for a class object, call LVectorChord::UnlockObject.

LVectorChord::LockObject and LVectorChord::UnlockObject must be called in pairs.

Note that rotating an object may change the object type. However, not all object types are changed by rotation, and not all rotations result in changing an object type. For example, a rectangle rotated 90 degrees about the z-axis is still a rectangle. A rectangle rotated 45 degrees about the z-axis becomes a polydraw object. The table below indicates object types that may change following rotation and the possible resulting object types.

Original object type Possible object type following rotation

If an object type changes, LVectorChord::LockObject and LVectorChord::UnlockObject will return WRPERR_VECTOR_INVALID_OBJECT_TYPE. Object properties can still be inspected and changed by using LVectorObject::GetObjectAttributes and LVectorObject::SetObjectAttributes.

Required DLLs and Libraries

See Also




This example will add a new green chord to the Active Layer LVectorBase object
Once added, the color will be changed to blue

L_INT LVectorChord__LockObjectExample(HWND hWnd, LVectorBase *pVector) 
   L_INT          nRet; 
   VECTORCHORD    Chord; 
   Chord.Point.x = 50; 
   Chord.Point.y = 50; 
   Chord.Point.z = 0; 
   Chord .Pen. bExtPen = FALSE;   
   Chord.Pen.nSize = sizeof( VECTORPEN ); 
   Chord.Pen.NewPen.LogPen.lopnStyle = PS_SOLID; 
   Chord.Pen.NewPen.LogPen.lopnWidth.x = 1; 
   Chord.Pen.NewPen.LogPen.lopnWidth.y = 1; 
   Chord.Pen.NewPen.LogPen.lopnColor = RGB(255,255,0); 
   Chord.Brush.nSize = sizeof(VECTORBRUSH); 
   Chord.Brush.VectorBrushStyle = VECTORBRUSH_STANDARD;   Chord.Brush.BrushType.StandardBrush.LogBrush.lbColor = RGB(0,255,0); 
   Chord.Brush.BrushType.StandardBrush.LogBrush.lbStyle = BS_SOLID; 
   Chord.Radius = 30; 
   Chord.StartAngle = 45; 
   Chord.SweepAngle = 145; 
   LVectorChord VectorChord(&Chord); 
   // add to current active layer 
   LVectorLayer VectorLayer; 
   nRet = pVector->GetActiveLayer(&VectorLayer); 
   if (nRet == SUCCESS) 
      nRet = VectorLayer.AddObject(&VectorChord); 
      if(nRet != SUCCESS) 
         return nRet; 
      //Now change color to blue 
      MessageBox(NULL, TEXT("Changing pen color to blue"), TEXT(""), MB_OK); 
      VECTORCHORD ChordTemp; 
      nRet = VectorChord.LockObject(&ChordTemp); 
      if(nRet != SUCCESS) 
         return nRet; 
      ChordTemp.Pen. bExtPen = FALSE; 
      ChordTemp.Pen.NewPen.LogPen.lopnColor = RGB(0,0,255); 
      nRet = VectorChord.UnlockObject(&ChordTemp); 
      if(nRet != SUCCESS) 
         return nRet; 
      MessageBox(NULL, TEXT("No Active Layer--Load a vector and run again"), TEXT(""), MB_OK); 
      return nRet; 
   //LVectorChord destructor called when VectorChord goes out of scope 
   return SUCCESS; 

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