Hallo nochmal.
Wen's interessiert: Ich denke ich habe die Lösung des Problems gefunden. Und zwar auf der M'soft Support-Seite:
SYMTOMS
When either a Bitmap object or an Image object is constructed from a file, the file
remains locked for the lifetime of the object. As a result, you cannot change an image and
save it back to the same file where it originated.
Additionally, if the stream was destroyed during the life of the Bitmap object, you cannot successfully access an image that
was based on a stream. For example, the Graphics.DrawImage() function may not succeed after the stream has been
destroyed.
CAUSE
GDI+, and therefore the System.Drawing namespace, may defer the decoding of raw image bits until the bits are required
by the image. Additionally, even after the image has been decoded, GDI+ may determine that it is more efficient to discard
the memory for a large Bitmap and to re-decode later. Therefore, GDI+ must have access to the source bits for the image for
the life of the Bitmap or the Image object.
To retain access to the source bits, GDI+ locks any source file, and forces the application to maintain the life of any source
stream, for the life of the Bitmap or the Image object.
SOLUTION
Hier mal meine Lösung:
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| public void LoadXML(string FileName)
{
XmlDocument XmlDoc = new XmlDocument();
try {
XmlDoc.Load(FileName);
}
catch (Exception ex) {
MessageBox.Show("Fehler beim Öffnen der XML-Datei (" + FileName + "): " +
ex.Message, Application.ProductName, MessageBoxButtons.OK,
MessageBoxIcon.Error);
return;
}
XmlNode DocNode = XmlDoc.DocumentElement;
foreach (XmlNode ProgramNode in DocNode.ChildNodes) {
if (ProgramNode.Name == "Name")
this.Name = ProgramNode.InnerText;
if (ProgramNode.Name == "Description")
this.Description = ProgramNode.InnerText;
if (ProgramNode.Name == "Types") {
foreach (XmlNode TypeNode in ProgramNode.ChildNodes) {
HistoryType HT = new HistoryType();
HT.Description = TypeNode.Attributes["Description"].InnerText;
byte[] Buffer = Convert.FromBase64String(TypeNode.Attributes["Icon"].InnerText);
MemoryStream ImageStream = new MemoryStream(Buffer);
Bitmap img = Image.FromStream(ImageStream);
Image img2 = new Bitmap(img.Width, img.Height, PixelFormat.Format32bppRgb);
Graphics g = Graphics.FromImage(img2);
g.DrawImage(img, new Rectangle(0, 0, img2.Width, img2.Height));
g.Dispose();
img.Dispose();
HT.Icon = img2;
ImageStream.Close();
this.Types.Add(HT);
}
}
}
}
public void SaveXML(string FileName)
{
XmlTextWriter w;
try {
w = new XmlTextWriter(FileName, Encoding.UTF8);
}
catch (Exception ex) {
MessageBox.Show("Fehler beim Öffnen der XML-Datei (" + FileName + "): " +
ex.Message, Application.ProductName, MessageBoxButtons.OK,
MessageBoxIcon.Error);
return;
}
w.Formatting = Formatting.Indented;
w.Indentation = 2;
w.IndentChar = ' ';
w.WriteStartDocument(true);
w.WriteStartElement("Program");
w.WriteElementString("Name", this.Name);
w.WriteElementString("Description", this.Description);
w.WriteStartElement("Types");
w.WriteAttributeString("Count", Convert.ToString(this.Types.Count));
for (int i = 0; i < this.Types.Count; i++) {
w.WriteStartElement("Type");
w.WriteAttributeString("Description", this.Types[i].Description);
MemoryStream ImageStream = new MemoryStream();
this.Types[i].Icon.Save(ImageStream, ImageFormat.Bmp); <==== geändert
byte[] Buffer = new byte[ImageStream.Length];
Buffer = ImageStream.ToArray();
w.WriteAttributeString("Icon", Convert.ToBase64String(Buffer));
w.WriteEndElement();
}
w.WriteEndElement();
w.WriteEndDocument();
w.Close();
} |
