Reference Guide
GdPicture14.WPF Namespace / GdViewer Class / TagCount Method
Example





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    TagCount Method (GdViewer)
    In This Topic
    Returns the total number of tags (EXIF, IPTC, Extra, Thumbnails & GPS, XML packet) embedded within the document displayed in the GdViewer control. These tags, also known as document's metadata, allows for additional information to be stored within a document.
    Syntax
    'Declaration
     
    
    Public Function TagCount() As Integer
    public int TagCount()
    public function TagCount(): Integer; 
    public function TagCount() : int;
    public: int TagCount(); 
    public:
    int TagCount(); 

    Return Value

    The total number of tags embedded within the displayed document. Please always use the GetStat method to determine if this method has been successful.
    Remarks
    We strongly recommend using the GetStat method to identify the specific reason for the method's failure.

    Please note that 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 total number of tags embedded in the displayed document.
    '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.TagCount")
    Else
        MessageBox.Show("The number of tags can't be found. Status: " + GdViewer1.GetStat().ToString(), "GdViewer.TagCount")
    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.TagCount");
    }
    else
        MessageBox.Show("The number of tags can't be found. Status: " + GdViewer1.GetStat().ToString(), "GdViewer.TagCount");
    See Also