Hi,
I'm trying Mono 1.1.6 in Windows XP. This simple line:
MessageBox.Show(text);
...raises the following exception:
________________________________________________________
Unhandled Exception: System.TypeInitializationException: An exception
was thrown
by the type initializer for MessageBoxForm --->
System.Reflection.TargetInvocat
ionException: Exception has been thrown by the target of an
invocation. ---> Sys
tem.NotImplementedException: Bitmap.InitFromStream (win32)
in <0x00103> System.Drawing.Image:InitFromStream
(System.IO.Stream stream)
[...]
in <0x0052b> System.Resources.ResourceReader:ResourceValue (Int32 index)
[...]
in <0x00010> System.Resources.ResourceManager:GetObject
(System.String name)
in <0x00017> System.Windows.Forms.Locale:GetResource
(System.String name)
in <0x00012>
System.Windows.Forms.MessageBox+MessageBoxForm:.cctor ()--- End of
inner exception stack trace ---
in <0x00000> <unknown method>
in <0x0002c> System.Windows.Forms.MessageBox:Show (System.String text)
[...]
________________________________________________________
I digged a bit into the source code of Mono and found the following clues:
*) System.Drawing\Image.cs has an explanation:
// this is MS-land
// FIXME
// We can't call the native gdip functions here, because they expect
// a COM IStream interface. So, a hack is to create a tmp file, read
// the stream, and then load from the tmp file.
// This is an ugly hack.
throw new NotImplementedException ("Bitmap.InitFromStream (win32)");
*) MessageBoxForm tries to get reources in this way:
internal static Image info_icon =
(Image)Locale.GetResource("mbox_info.png");
*) There is a System.Runtime.InteropServices.ComTypes\IStream.cs
implemented only "if NET_2_0".
I have two questions:
1) Is it feasible to resolve this issue using the above-mentioned
IStream, declaring something like:
[DllImport("gdiplus.dll")]
internal static extern Status GdipLoadImageFromStream ( IStream
stream, out IntPtr image );
...in System.Drawing.gdipFunctions.cs, and then using it in
Image:InitFromStream "MS-land" ?
2) Is it really necessary that MessageBox tried to load an image
resource when the call was just ".Show(text)" ? Maybe it's better to
load the resources in the "switch (icon)" part...
Hoping my comments be useful.
Regards,
Ricardo Stuven.
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