Image.PropertyItems プロパティ
アセンブリ: System.Drawing (system.drawing.dll 内)



System.Drawing.Imaging.PropertyItem クラスと PropertyItems プロパティを使用して、イメージ ファイル内のメタデータの読み取りと表示を行う方法を次のコード例に示します。
この例は、System.Drawing.Imaging 名前空間をインポートする Windows フォームでの使用を意図してデザインされています。コードをフォームに貼り付け、システムのイメージ ファイルを指すように fakePhoto.jpg へのパスを変更します。フォームの Paint イベントを処理する際に ExtractMetaData メソッドを呼び出し、e を PaintEventArgs として渡します。
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.PropertyItems; // Set up the display. Font font1 = new Font("Arial", 10); SolidBrush blackBrush = new SolidBrush(Color.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 ) { e.Graphics.DrawString("Property Item " + count.ToString(), font1, blackBrush, X, Y); Y += font1.Height; e.Graphics.DrawString(" ID: 0x" + propItem.Id.ToString("x"), font1, blackBrush, X, Y); Y += font1.Height; e.Graphics.DrawString(" type: " + propItem.Type.ToString(), font1, blackBrush, X, Y); Y += font1.Height; e.Graphics.DrawString(" length: " + propItem.Len.ToString() + " bytes", font1, blackBrush, X, Y); Y += font1.Height; count += 1; } font1.Dispose(); } catch(Exception) { MessageBox.Show("There was an error." + "Make sure the path to the image file is valid."); } }
private: void ExtractMetaData( PaintEventArgs^ e ) { try { // Create an Image object. Image^ theImage = gcnew Bitmap( "c:\\fakePhoto.jpg" ); // Get the PropertyItems property from image. array<PropertyItem^>^propItems = theImage->PropertyItems; // Set up the display. System::Drawing::Font^ font1 = gcnew System::Drawing::Font( "Arial",10 ); SolidBrush^ blackBrush = gcnew SolidBrush( Color::Black ); int X = 0; int Y = 0; // For each PropertyItem in the array, display the id, // type, and length. int count = 0; System::Collections::IEnumerator^ myEnum = propItems->GetEnumerator(); while ( myEnum->MoveNext() ) { PropertyItem^ propItem = safe_cast<PropertyItem^>(myEnum->Current); e->Graphics->DrawString( String::Format( "Property Item {0}", count ), font1, blackBrush, (float)X, (float)Y ); Y += font1->Height; e->Graphics->DrawString( String::Format( " ID: 0x{0}", propItem->Id.ToString( "x" ) ), font1, blackBrush, (float)X, (float)Y ); Y += font1->Height; e->Graphics->DrawString( String::Format( " type: {0}", propItem->Type ), font1, blackBrush, (float)X, (float)Y ); Y += font1->Height; e->Graphics->DrawString( String::Format( " length: {0} bytes", propItem->Len ), font1, blackBrush, (float)X, (float)Y ); Y += font1->Height; count += 1; } delete font1; } catch ( Exception^ ) { MessageBox::Show( "There was an error." "Make sure the path to the image file is valid." ); } }
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 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
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