Example





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GdPicture14 Namespace / GdPicturePDF Class / GetPageMetadata() Method

GetPageMetadata() Method

In This Topic
Gets the metadata of the currently selected page in the loaded PDF document.
Syntax
'Declaration

 


Public Function GetPageMetadata() As String
public string GetPageMetadata()
public function GetPageMetadata(): String; 
public function GetPageMetadata() : String;
public: string* GetPageMetadata(); 
public:

String^ GetPageMetadata();

Return Value

The metadata of the current page as a string, if any are defined. The GdPicturePDF.GetStat method can be subsequently used to determine if this method has been successful.
Remarks
This method is only allowed for use with non-encrypted documents.

It is recommend to use the GdPicturePDF.GetStat method to identify the specific reason for the method's failure, if any.

Example
How to obtain the metadata linked with all pages of the PDF document. Metadata linked to each page are subsequently saved into a separate file. 
Dim caption As String = "Example: GetPageMetadata"

Dim gdpicturePDF As New GdPicturePDF()

If gdpicturePDF.LoadFromFile("testPDF.pdf", False) = GdPictureStatus.OK Then

    Dim count As Integer = gdpicturePDF.GetPageCount()

    Dim status As GdPictureStatus = gdpicturePDF.GetStat()

    If status = GdPictureStatus.OK Then

        Dim data As String = "", message As String = ""

        For i As Integer = 1 To count

            status = gdpicturePDF.SelectPage(i)

            If status = GdPictureStatus.OK Then

                data = gdpicturePDF.GetPageMetadata()

                status = gdpicturePDF.GetStat()

                If status = GdPictureStatus.OK Then

                    message = message + "Page nr." + i.ToString() + " contains this metadata: " + data + vbCrLf

                    //Metadata of each page are saved into a separate file.

                    Dim filename As String = "metadata_page" + i.ToString() + ".xmp"

                    System.IO.File.WriteAllText(filename, data)

                Else

                    message = message + "The GetPageMetadata() method has failed for the page nr." + i.ToString() + " with the status: " + status.ToString() + vbCrLf

                End If

            Else

                message = message + "The SelectPage() method has failed for the page nr." + i.ToString() + " with the status: " + status.ToString() + vbCrLf

            End If

        Next

        MessageBox.Show(message, caption)

    Else

        MessageBox.Show("The GetPageCount() method has failed with the status: " + status.ToString(), caption)

    End If

Else

    MessageBox.Show("The file can't be loaded.", caption)

End If

gdpicturePDF.Dispose()
string caption = "Example: GetPageMetadata";

GdPicturePDF gdpicturePDF = new GdPicturePDF();

if (gdpicturePDF.LoadFromFile("testPDF.pdf", false) == GdPictureStatus.OK)

{

    int count = gdpicturePDF.GetPageCount();

    GdPictureStatus status = gdpicturePDF.GetStat();

    if (status == GdPictureStatus.OK)

    {

        string data = "", message = "";

        for (int i = 1; i <= count; i++)

        {

            status = gdpicturePDF.SelectPage(i);

            if (status == GdPictureStatus.OK)

            {

                data = gdpicturePDF.GetPageMetadata();

                status = gdpicturePDF.GetStat();

                if (status == GdPictureStatus.OK)

                {

                    message = message + "Page nr." + i.ToString() + " contains this metadata: " + data + "\n";

                    //Metadata of each page are saved into a separate file.

                    string filename = "metadata_page" + i.ToString() + ".xmp";

                    System.IO.File.WriteAllText(filename, data);

                }

                else

                    message = message + "The GetPageMetadata() method has failed for the page nr." + i.ToString() + " with the status: " + status.ToString() + "\n";

            }

            else

                message = message + "The SelectPage() method has failed for the page nr." + i.ToString() + " with the status: " + status.ToString() + "\n";

        }

        MessageBox.Show(message, caption);

    }

    else

        MessageBox.Show("The GetPageCount() method has failed with the status: " + status.ToString(), caption);

}

else

    MessageBox.Show("The file can't be loaded.", caption);

gdpicturePDF.Dispose();
Example
How to obtain the metadata linked with all pages of the PDF document. Metadata linked to each page are subsequently saved into a separate file. Dim caption As String = "Example: GetPageMetadata" Dim gdpicturePDF As New GdPicturePDF() If gdpicturePDF.LoadFromFile("testPDF.pdf", False) = GdPictureStatus.OK Then Dim count As Integer = gdpicturePDF.GetPageCount() Dim status As GdPictureStatus = gdpicturePDF.GetStat() If status = GdPictureStatus.OK Then Dim data As String = "", message As String = "" For i As Integer = 1 To count status = gdpicturePDF.SelectPage(i) If status = GdPictureStatus.OK Then data = gdpicturePDF.GetPageMetadata() status = gdpicturePDF.GetStat() If status = GdPictureStatus.OK Then message = message + "Page nr." + i.ToString() + " contains this metadata: " + data + vbCrLf //Metadata of each page are saved into a separate file. Dim filename As String = "metadata_page" + i.ToString() + ".xmp" System.IO.File.WriteAllText(filename, data) Else message = message + "The GetPageMetadata() method has failed for the page nr." + i.ToString() + " with the status: " + status.ToString() + vbCrLf End If Else message = message + "The SelectPage() method has failed for the page nr." + i.ToString() + " with the status: " + status.ToString() + vbCrLf End If Next MessageBox.Show(message, caption) Else MessageBox.Show("The GetPageCount() method has failed with the status: " + status.ToString(), caption) End If Else MessageBox.Show("The file can't be loaded.", caption) End If gdpicturePDF.Dispose() string caption = "Example: GetPageMetadata"; GdPicturePDF gdpicturePDF = new GdPicturePDF(); if (gdpicturePDF.LoadFromFile("testPDF.pdf", false) == GdPictureStatus.OK) { int count = gdpicturePDF.GetPageCount(); GdPictureStatus status = gdpicturePDF.GetStat(); if (status == GdPictureStatus.OK) { string data = "", message = ""; for (int i = 1; i <= count; i++) { status = gdpicturePDF.SelectPage(i); if (status == GdPictureStatus.OK) { data = gdpicturePDF.GetPageMetadata(); status = gdpicturePDF.GetStat(); if (status == GdPictureStatus.OK) { message = message + "Page nr." + i.ToString() + " contains this metadata: " + data + "\n"; //Metadata of each page are saved into a separate file. string filename = "metadata_page" + i.ToString() + ".xmp"; System.IO.File.WriteAllText(filename, data); } else message = message + "The GetPageMetadata() method has failed for the page nr." + i.ToString() + " with the status: " + status.ToString() + "\n"; } else message = message + "The SelectPage() method has failed for the page nr." + i.ToString() + " with the status: " + status.ToString() + "\n"; } MessageBox.Show(message, caption); } else MessageBox.Show("The GetPageCount() method has failed with the status: " + status.ToString(), caption); } else MessageBox.Show("The file can't be loaded.", caption); gdpicturePDF.Dispose();
See Also

Reference

GdPicturePDF Class
GdPicturePDF Members
GetStat Method
GetStat Method
GetPageCount Method
SelectPage Method
SetPageMetadata(String) Method
GetCurrentPage Method