包含类型不实现接口IMessageFilter

本文关键字：接口 IMessageFilter 实现 类型 包含 | 更新日期: 2023-09-27 18:04:32

我还在试图找出这个错误是怎么回事:

OCR.test.IMessageFilter。PreFilterMessage(ref System.Windows.Forms.Message):包含类型不实现接口System.Windows.Forms.IMessageFilter

以下是我的代码:

bool IMessageFilter.PreFilterMessage(ref Message m) // Error with this line
{
    TwainCommand cmd = tw.PassMessage(ref m);
    if (cmd == TwainCommand.Not)
        return false;
    switch (cmd)
    {
        case TwainCommand.CloseRequest:
        {
            EndingScan();
            tw.CloseSrc();
            break;
        }
        case TwainCommand.CloseOk:
        {
            EndingScan();
            tw.CloseSrc();
            break;
        }
        case TwainCommand.DeviceEvent:
        {
           break;
        }
        case TwainCommand.TransferReady:
        {
            ArrayList pics = tw.TransferPictures();
            EndingScan();
            tw.CloseSrc();
            picnumber++;
            for (int i = 0; i < pics.Count; i++)
            {
                IntPtr img = (IntPtr)pics[i];
                PicForm newpic = new PicForm(img);
                newpic.MdiParent = this;
                int picnum = i + 1;
                //newpic.Text = "ScanPass " + picnumber.ToString() + "_Pic " + picnum.ToString();
                newpic.Show();
            }
            break;
        }
    }
    return true;
}

包含类型不实现接口IMessageFilter

实现PreFilterMessage方法的类需要派生自IMessageFilter Interface。你可能错过了

public class Foo: IMessageFilter
{
   bool IMessageFilter.PreFilterMessage(ref Message m)
   {
       // your code
   }
}
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