GetRegionPage Method (GdViewer)

In This Topic

Gets the number of the page on which a highlighted region is drawn (placed). The region is specified by its unique identifier related to the document currently displayed in the GdViewer control. These regions, if present, determines the currently defined highlighted regions on the displayed document.

You can redefine the page of each highlighted region using the SetRegionPage method.

Syntax

Visual Basic
C#
Delphi
JScript
Managed Extensions for C++
C++/CLI

'Declaration
 
Public Function GetRegionPage( _
   ByVal RegionID As Integer _
) As Integer

public int GetRegionPage( 
   int RegionID
)

public function GetRegionPage( 
    RegionID: Integer
): Integer;

public function GetRegionPage( 
   RegionID : int
) : int;

public: int GetRegionPage( 
   int RegionID
)

public:
int GetRegionPage( 
   int RegionID
)

Parameters

RegionID: A unique region identifier of the specified region. You can obtain this identifier using the GetRegionID method or when creating regions using AddRegion(String,Int32,Int32,Int32,Int32,ForegroundMixMode,Int32) or AddRegionInches(String,Single,Single,Single,Single,ForegroundMixMode,Int32) methods.

Return Value

The number of the page, where the specified region is drawn. The GetStat method can be subsequently used 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 draw a rectangle on the document's page according to the user's selection of the highlighted rectangle in the GdViewer control.

VB.NET
C#

'We assume that the GdViewer1 control has been properly integrated
'and some PDF document is loaded and displayed as well.
            
'Here we make use of the RegionSelectedByUser event.
Sub GdViewer1_RegionSelectedByUser(ByVal RegionID As Integer)
    Dim page As Integer = GdViewer1.GetRegionPage(RegionID)
    'Converting pixels to PDF points.
    Dim left As Integer = GdViewer1.GetRegionLeftPixels(RegionID) * 0.75
    Dim top As Integer = GdViewer1.GetRegionTopPixels(RegionID) * 0.75
    Dim width As Integer = GdViewer1.GetRegionWidthPixels(RegionID) * 0.75
    Dim height As Integer = GdViewer1.GetRegionHeightPixels(RegionID) * 0.75
    Using oPDF As GdPicturePDF = New GdPicturePDF()
        If oPDF.LoadFromFile(GdViewer1.GetLastPath(), False) = GdPictureStatus.OK Then
            oPDF.SetMeasurementUnit(PdfMeasurementUnit.PdfMeasurementUnitPoint)
            oPDF.SetOrigin(PdfOrigin.PdfOriginTopLeft)
            'Drawing a rectangle on the document's page according to the selected rectangle in the GdViewer1 control.
            If (oPDF.SelectPage(page) = GdPictureStatus.OK) AndAlso
               (oPDF.SetFillAlpha(150) = GdPictureStatus.OK) AndAlso
               (oPDF.SetFillColor(0, 191, 255) = GdPictureStatus.OK) AndAlso
               (oPDF.DrawRectangle(left, top, width, height, True, False) = GdPictureStatus.OK) Then
                If oPDF.SaveToFile("test_region.pdf") = GdPictureStatus.OK Then
                    MessageBox.Show("The file has been saved successfully.", "GdViewer.GetRegionPage")
                Else
                    MessageBox.Show("The file can't be saved. Status: " + oPDF.GetStat().ToString(), "GdViewer.GetRegionPage")
                End If
            Else
                MessageBox.Show("The graphics operations have failed. Status: " + oPDF.GetStat().ToString(), "GdViewer.GetRegionPage")
            End If
        Else
            MessageBox.Show("The file can't be loaded. Status: " + oPDF.GetStat().ToString(), "GdViewer.GetRegionPage")
        End If
    End Using
End Sub

//We assume that the GdViewer1 control has been properly integrated
//and some PDF document is loaded and displayed as well.
            
//Here we make use of the RegionSelectedByUser event.
void GdViewer1_RegionSelectedByUser(int RegionID)
{
    int page = GdViewer1.GetRegionPage(RegionID);
    //Converting pixels to PDF points.
    int left = (int)(GdViewer1.GetRegionLeftPixels(RegionID) * 0.75);
    int top = (int)(GdViewer1.GetRegionTopPixels(RegionID) * 0.75);
    int width = (int)(GdViewer1.GetRegionWidthPixels(RegionID) * 0.75);
    int height = (int)(GdViewer1.GetRegionHeightPixels(RegionID) * 0.75);
    using (GdPicturePDF oPDF = new GdPicturePDF())
    {
        if (oPDF.LoadFromFile(GdViewer1.GetLastPath(), false) == GdPictureStatus.OK)
        {
            oPDF.SetMeasurementUnit(PdfMeasurementUnit.PdfMeasurementUnitPoint);
            oPDF.SetOrigin(PdfOrigin.PdfOriginTopLeft);
            //Drawing a rectangle on the document's page according to the selected rectangle in the GdViewer1 control.
            if ((oPDF.SelectPage(page) == GdPictureStatus.OK) &&
                (oPDF.SetFillAlpha(150) == GdPictureStatus.OK) &&
                (oPDF.SetFillColor(0, 191, 255) == GdPictureStatus.OK) &&
                (oPDF.DrawRectangle(left, top, width, height, true, false) == GdPictureStatus.OK))
            {
                if (oPDF.SaveToFile("test_region.pdf") == GdPictureStatus.OK)
                    MessageBox.Show("The file has been saved successfully.", "GdViewer.GetRegionPage");
                else
                    MessageBox.Show("The file can't be saved. Status: " + oPDF.GetStat().ToString(), "GdViewer.GetRegionPage");
            }
            else
                MessageBox.Show("The graphics operations have failed. Status: " + oPDF.GetStat().ToString(), "GdViewer.GetRegionPage");
        }
        else
            MessageBox.Show("The file can't be loaded. Status: " + oPDF.GetStat().ToString(), "GdViewer.GetRegionPage");
    }
}

Reference

GdViewer Class
GdViewer Members
RegionSelectedByUser Event
SetRegionPage Method
RegionCount Method
GetRegionID Method
SearchText(String,Int32,Boolean) Method
AddRegion(String,Int32,Int32,Int32,Int32,ForegroundMixMode,Int32) Method
AddRegionInches(String,Single,Single,Single,Single,ForegroundMixMode,Int32) Method