Dynamsoft TWAIN Products

I have a problem when I use Dynamic Twain.
I write a windows application with C# language in Visual Studio 2005. There are two forms in this application. One is “MainForm???that shown at the start time. The other is “ScanForm???that uses Dynamic Twain to acquire image from scanner.

[MainForm Code]
public partial class MainForm : Form
{
private ScanForm m_ScanForm;

public MainForm()
{
InitializeComponent();
m_ScanForm = new ScanForm();
}

// A button handler to show Scan Form
private void Ctrl_Show_Click(object sender, EventArgs e)
{
m_ScanForm.ShowDialog();
}

}

[ScanForm Code]
public partial class ScanForm : Form
{
public ScanForm()
{
InitializeComponent();
Twain.IfThrowException = true;
}

// A button handler to acquire image
private void Ctrl_Scan_Click(object sender, EventArgs e)
{
bool bOK = Twain.AcquireImage();
if (!bOK)
MessageBox.Show(Twain.ErrorString);
}
}

Start the application and click MainForm’s button to show ScanForm, and then click ScanForm’s button to acquire image. The source’s UI is displayed, and then close the UI and ScanForm.
Click MainForm’s button to show ScanForm again. At this time, when click ScanForm’s button to acquire image, the source’s UI can’t be displayed. An exception (System.Runtime.InteropServices.COMException) is thrown.
When disable Twain.IfThrowException, the message of “Capability not supported by source???is displayed.

Hi Sunmoon,

We need to test your code to find the cause of this issue. Would you please send your project to TWAINsupport@dynamsoft.com? Our support team will check the code for you.

Thanks.

Hi Robert,

I have send my project to TWAINsupport@dynamsoft.com.

I expect your answer.

Thanks.

Our support team has sent you the modified code. Please test it and let me know if it works for you.

Thanks.

I will modify my project with your suggested method.

Thank for your help.