PropertyItem Class
.NET Framework 3.0
Encapsulates a metadata property to be included in an image file. Not inheritable.
Namespace: System.Drawing.Imaging
Assembly: System.Drawing (in system.drawing.dll)
System.Drawing.Imaging Namespace
Assembly: System.Drawing (in system.drawing.dll)
The following code example demonstrates how to read and display the metadata in an image file using the PropertyItem class and the Image.PropertyItems property.
This example is designed to be used in a Windows Form that imports the System.Drawing.Imaging namespace. Paste the code into the form and change the path to fakePhoto.jpg to point to an image file on your system. Call the ExtractMetaData method when handling the form's Paint event, passing e as PaintEventArgs.
Private Sub ExtractMetaData(ByVal e As PaintEventArgs) Try 'Create an Image object. Dim theImage As Image = New Bitmap("c:\fakePhoto.jpg") 'Get the PropertyItems property from image. Dim propItems As PropertyItem() = theImage.PropertyItems 'Set up the display. Dim font As New font("Arial", 10) Dim blackBrush As New SolidBrush(Color.Black) Dim X As Integer = 0 Dim Y As Integer = 0 'For each PropertyItem in the array, display the id, type, and length. Dim count As Integer = 0 Dim propItem As PropertyItem For Each propItem In propItems e.Graphics.DrawString("Property Item " + count.ToString(), _ font, blackBrush, X, Y) Y += font.Height e.Graphics.DrawString(" iD: 0x" & propItem.Id.ToString("x"), _ font, blackBrush, X, Y) Y += font.Height e.Graphics.DrawString(" type: " & propItem.Type.ToString(), _ font, blackBrush, X, Y) Y += font.Height e.Graphics.DrawString(" length: " & propItem.Len.ToString() & _ " bytes", font, blackBrush, X, Y) Y += font.Height count += 1 Next propItem font.Dispose() Catch ex As ArgumentException MessageBox.Show("There was an error. Make sure the path to the image file is valid.") End Try End Sub
private void ExtractMetaData(PaintEventArgs e)
{
try {
// Create an Image object.
Image theImage = new Bitmap("c:\\fakePhoto.jpg");
// Get the PropertyItems property from image.
PropertyItem propItems[] = theImage.get_PropertyItems();
// Set up the display.
Font font1 = new Font("Arial", 10);
SolidBrush blackBrush = new SolidBrush(Color.get_Black());
int X = 0;
int Y = 0;
// For each PropertyItem in the array, display the id,
// type, and length.
int count = 0;
//foreach (PropertyItem propItem in propItems)
for (int iCtr = 0; iCtr < propItems.length; iCtr++) {
PropertyItem propItem = propItems[iCtr];
e.get_Graphics().DrawString("Property Item "
+ System.Convert.ToString(count), font1, blackBrush, X, Y);
Y += font1.get_Height();
e.get_Graphics().DrawString(" ID: 0x"
+ ((System.Int32)propItem.get_Id()).ToString("x"), font1,
blackBrush, X, Y);
Y += font1.get_Height();
e.get_Graphics().DrawString(" type: "
+ System.Convert.ToString(propItem.get_Type()), font1,
blackBrush, X, Y);
Y += font1.get_Height();
e.get_Graphics().DrawString(" length: "
+ System.Convert.ToString(propItem.get_Len()) + " bytes",
font1, blackBrush, X, Y);
Y += font1.get_Height();
count += 1;
}
font1.Dispose();
}
catch (System.Exception exp) {
MessageBox.Show(("There was an error."
+ "Make sure the path to the image file is valid."));
}
} //ExtractMetaData
Windows 98, Windows Server 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.Reference
PropertyItem MembersSystem.Drawing.Imaging Namespace
Other Resources
How to: Read Image MetadataCommunity Additions
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