Exception of type 'System.Windows.Forms.AxHost+InvalidActiveXStateException' was thrown

c# .net winforms fingerprint axhost
autthapone picture autthapone · Aug 30, 2011 · Viewed 16.2k times · Source

I am getting an error in my simple project.

This is my code:

if (axZKFPEngX1.InitEngine() == 0) {
    label1.Text = "Connected";
}
else {
    label1.Text = "Connection Failed";
}

I already added reference composites AxInterop.ZKFPEngXControl and Interop.ZKFPEngXControl.

While debugging, I click the button, and a warning appears:

InvalidActiveXStateException was handled.

"Exception of type 'System.Windows.Forms.AxHost+InvalidActiveXStateException' was thrown"**

Answer

Constantin picture Constantin · Oct 14, 2011

try to call CreateControl() from your component first.

Related questions

How do I make a textbox that only accepts numbers?

I have a windows forms app with a textbox control that I want to only accept integer values. In the past I've done this kind of validation by overloading the KeyPress event and just removing characters which didn't fit the …

Read More
How do I update the GUI from another thread?

Which is the simplest way to update a Label from another Thread? I have a Form running on thread1, and from that I'm starting another thread (thread2). While thread2 is processing some files I would like to update a Label …

Read More
Get current folder path

I want to create a program that converts files. I would like the user to be able to place the executable file in any directory, and when executing that program (double-clicking on the .exe) I want the program to process …

Read More