TagGetValueString Method (GdViewer)

In This Topic

Returns a string representation of the current tag value of the required tag, that is embedded within the document displayed in the GdViewer control.

Syntax

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

'Declaration
 
Public Function TagGetValueString( _
   ByVal TagNo As Integer _
) As String

public string TagGetValueString( 
   int TagNo
)

public function TagGetValueString( 
    TagNo: Integer
): String;

public function TagGetValueString( 
   TagNo : int
) : String;

public: string* TagGetValueString( 
   int TagNo
)

public:
String^ TagGetValueString( 
   int TagNo
)

Parameters

TagNo: The sequence index of the required tag within the displayed document. It must be a value from 1 to TagCount.

Return Value

The current tag value as a string. The GetStat method can be subsequently used to determine if this method has been successful.

Remarks

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

This method handles EXIF tags, IPTC tags, Extra tags (like Adobe Image Information tags etc.), Thumbnail related tags, GPS tags and XML packet metadata.

Example

How to find out the tag's value.

VB.NET
C#

'We assume that the GdViewer1 control has been properly integrated
'and your document has been properly displayed as well.
Dim count As Integer = GdViewer1.TagCount()
If GdViewer1.GetStat() = GdPictureStatus.OK Then
    Dim message As String = "Tags count: " + count + vbCrLf
    Dim tagID As Tags = Tags.TagUnknown
    Dim tagName As String = "", tagValue As String = ""
    For i As Integer = 1 To count
        tagID = GdViewer1.TagGetID(i)
        If GdViewer1.GetStat() = GdPictureStatus.OK Then tagName = GdViewer1.TagGetName(i)
        If GdViewer1.GetStat() = GdPictureStatus.OK Then tagValue = GdViewer1.TagGetValueString(i)
            
        If GdViewer1.GetStat() = GdPictureStatus.OK Then
            message = message + vbCrLf + tagName + " (" + tagID + "): " + tagValue
        Else
            message = message + vbCrLf + "Tag nr." + i + "  Status: " + GdViewer1.GetStat().ToString()
        End If
    Next
    MessageBox.Show(message, "GdViewer.TagGetValueString")
Else
    MessageBox.Show("The number of tags can't be found. Status: " + GdViewer1.GetStat().ToString(), "GdViewer.TagGetValueString")
End If

//We assume that the GdViewer1 control has been properly integrated
//and your document has been properly displayed as well.
int count = GdViewer1.TagCount();
if (GdViewer1.GetStat() == GdPictureStatus.OK)
{
    string message = "Tags count: " + count + "\n";
    Tags tagID = Tags.TagUnknown;
    string tagName = "", tagValue = "";
    for (int i = 1; i <= count; i++)
    {
        tagID = GdViewer1.TagGetID(i);
        if (GdViewer1.GetStat() == GdPictureStatus.OK)
            tagName = GdViewer1.TagGetName(i);
        if (GdViewer1.GetStat() == GdPictureStatus.OK)
            tagValue = GdViewer1.TagGetValueString(i);
        if (GdViewer1.GetStat() == GdPictureStatus.OK)
            message = message + "\n" + tagName + " (" + tagID + "): " + tagValue;
        else
            message = message + "\nTag nr." + i + "  Status: " + GdViewer1.GetStat().ToString();
    }
    MessageBox.Show(message, "GdViewer.TagGetValueString");
}
else
    MessageBox.Show("The number of tags can't be found. Status: " + GdViewer1.GetStat().ToString(), "GdViewer.TagGetValueString");

Reference

GdViewer Class
GdViewer Members
TagCount Method
TagGetID Method
TagGetName Method
IPTCCount Method