GdPicture.NET Reference Guide
GetRegionID Method (GdViewer)
Example 





GdPicture14.WPF Namespace > GdViewer Class : GetRegionID Method
The sequence index of the required highlighted region related to the currently displayed document. It must be a value from 0 to RegionCount-1.
Returns the unique region identifier of a highlighted region specified by its sequence index related to the document currently displayed in the GdViewer control. You always have to apply this identifier when working with highlighted regions.

These regions, if present, determines the currently defined highlighted regions on the displayed document.

Syntax
'Declaration
 
Public Function GetRegionID( _
   ByVal RegionIdx As Integer _
) As Integer
public int GetRegionID( 
   int RegionIdx
)
public function GetRegionID( 
    RegionIdx: Integer
): Integer; 
public function GetRegionID( 
   RegionIdx : int
) : int;
public: int GetRegionID( 
   int RegionIdx
) 
public:
int GetRegionID( 
   int RegionIdx
) 

Parameters

RegionIdx
The sequence index of the required highlighted region related to the currently displayed document. It must be a value from 0 to RegionCount-1.

Return Value

A unique region identifier of a specified region. Please always use the GetStat method to determine if this method has been successful.
Remarks
Be aware that if the required region does not exist, the method will fail.
Example
How to find out the region's unique identifier and how to properly used it further.
'We assume that the GdViewer1 control has been properly integrated and your document has been properly displayed as well.
 
'To successfully follow this example, please use the code snippet attached to the AddRegion method to define highlighted regions
'or define some highlighted regions using SearchText methods by yourself.
Dim regID As Integer = 0, regCount As Integer = GdViewer1.RegionCount()
If regCount > 0 Then
    Dim message As String = "The number of regions: " + regCount.ToString()
    For j As Integer = 0 To regCount-1
        regID = GdViewer1.GetRegionID(j)
        message = message + vbCrLf + "regID: " + regID.ToString() + "  prev.name: " + GdViewer1.GetRegionName(regID) + "  current name: "
        GdViewer1.SetRegionName(regID, "Region" + regID.ToString())
        message += GdViewer1.GetRegionName(regID)
    Next
    MessageBox.Show(message, "GdViewer.GetRegionID")
Else
    MessageBox.Show("No highlighted region found related to this document. Status: " + GdViewer1.GetStat().ToString(), "GdViewer.GetRegionID")
End If
//We assume that the GdViewer1 control has been properly integrated and your document has been properly displayed as well.
 
//To successfully follow this example, please use the code snippet attached to the AddRegion method to define highlighted regions
//or define some highlighted regions using SearchText methods by yourself.
int regID = 0, regCount = GdViewer1.RegionCount();
if (regCount > 0)
{
    string message = "The number of regions: " + regCount.ToString();
    for (int j = 0; j < regCount; j++)
    {
        regID = GdViewer1.GetRegionID(j);
        message = message + "\nregID: " + regID.ToString() + "  prev.name: " + GdViewer1.GetRegionName(regID) + "  current name: ";
        GdViewer1.SetRegionName(regID, "Region" + regID.ToString());
        message += GdViewer1.GetRegionName(regID);
    }
    MessageBox.Show(message, "GdViewer.GetRegionID");
}
else
    MessageBox.Show("No highlighted region found related to this document. Status: " + GdViewer1.GetStat().ToString(), "GdViewer.GetRegionID");
See Also

Reference

GdViewer Class
GdViewer Members
RegionCount Method
RemoveRegionByID Method
RemoveAllRegions Method
AddRegion(String,Double,Double,Double,Double,Color,RegionFillMode) Method
SearchText(String,Int32,Boolean) Method
SearchText(String,Int32,Boolean,Boolean) Method