DllImport and visual component problem

[John Dinning]

I have created a simple visual component based on a Label, with no
properties or methods added so far (using VS2005, New Control Library
project for smart device Windows CE 5).

It builds ok, I can add it to the toolbox and use it no problem in my test
project..
However, it will also required to call an existing DLL.

When I just add the two lines:
[DllImport("MyTest.dll")]
private static extern int TestFunc();

It builds ok, but the component is somehow corrupted.
The text on the label in the designer in the test project displays
"KBDStatusLabelLib.KBDStatusLabel" not "KBDStatusLabel1" as expected.
Also, if I add a property the designer displays the the Error "The type
'Microsoft.CompactFramework.Design.UnsafeControl' has no property
named 'MyProperty'"


The code for the label component is here:

namespace KBDStatusLabelLib
{
public partial class KBDStatusLabel : Label
{
public KBDStatusLabel()
{
InitializeComponent();
}
[DllImport("MyTest.dll")]
private static extern int TestFunc();
}
}

Can anyone help please?

John.

 

[Guest]

John,
Marking your control with the DesktopCompatible(true) attribute will
eliminate the Unsafe control message. You should be able to then use the
debugger to determine any additional issues.

Rick D.
Contractor

 

[John Dinning]

Rick, thank you, thank you, thank you.
A simple fix and everything is now working perfectly. That was driving me
insane.

John.

John,
Marking your control with the DesktopCompatible(true) attribute will
eliminate the Unsafe control message. You should be able to then use the
debugger to determine any additional issues.

Rick D.
Contractor

I have created a simple visual component based on a Label, with no
properties or methods added so far (using VS2005, New Control Library
project for smart device Windows CE 5).

It builds ok, I can add it to the toolbox and use it no problem in my
test
project..
However, it will also required to call an existing DLL.

When I just add the two lines:
[DllImport("MyTest.dll")]
private static extern int TestFunc();

It builds ok, but the component is somehow corrupted.
The text on the label in the designer in the test project displays
"KBDStatusLabelLib.KBDStatusLabel" not "KBDStatusLabel1" as expected.
Also, if I add a property the designer displays the the Error "The type
'Microsoft.CompactFramework.Design.UnsafeControl' has no property
named 'MyProperty'"


The code for the label component is here:

namespace KBDStatusLabelLib
{
public partial class KBDStatusLabel : Label
{
public KBDStatusLabel()
{
InitializeComponent();
}
[DllImport("MyTest.dll")]
private static extern int TestFunc();
}
}

Can anyone help please?

John.