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public static ThrowDeviceError ( |
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| e | ||
| return | void | |
private Stream DoTransfer(int pageNumber, WiaBackgroundEventLoop eventLoop, string format)
{
var invoker = (FormBase)DialogParent;
if (eventLoop.GetSync(wia => wia.Item) == null)
{
return(null);
}
if (ScanParams.NoUI)
{
return(eventLoop.GetSync(wia => WiaApi.Transfer(wia, format, false)));
}
if (pageNumber == 1)
{
// The only downside of the common dialog is that it steals focus.
// If this is the first page, then the user has just pressed the scan button, so that's not
// an issue and we can use it and get the benefits of progress display and immediate cancellation.
return(ScanParams.Modal
? eventLoop.GetSync(wia => invoker.InvokeGet(() => WiaApi.Transfer(wia, format, true)))
: eventLoop.GetSync(wia => WiaApi.Transfer(wia, format, true)));
}
// For subsequent pages, we don't want to take focus in case the user has switched applications,
// so we use the custom form.
var form = formFactory.Create <FScanProgress>();
var waitHandle = new AutoResetEvent(false);
form.PageNumber = pageNumber;
form.Transfer = () => eventLoop.GetSync(wia => WiaApi.Transfer(wia, format, false));
form.Closed += (sender, args) => waitHandle.Set();
if (ScanParams.Modal)
{
invoker.Invoke(() => form.ShowDialog(DialogParent));
}
else
{
invoker.Invoke(() => form.Show(DialogParent));
}
waitHandle.WaitOne();
if (form.Exception != null)
{
WiaApi.ThrowDeviceError(form.Exception);
}
if (form.DialogResult == DialogResult.Cancel)
{
return(null);
}
return(form.ImageStream);
}
public Stream Transfer(int pageNumber, WiaBackgroundEventLoop eventLoop, string format)
{
if (eventLoop.GetSync(wia => wia.Item) == null)
{
return(null);
}
if (pageNumber == 1)
{
// The only downside of the common dialog is that it steals focus.
// If this is the first page, then the user has just pressed the scan button, so that's not
// an issue and we can use it and get the benefits of progress display and immediate cancellation.
ImageFile imageFile = eventLoop.GetSync(wia =>
(ImageFile) new CommonDialogClass().ShowTransfer(wia.Item, format));
if (imageFile == null)
{
return(null);
}
return(new MemoryStream((byte[])imageFile.FileData.get_BinaryData()));
}
// For subsequent pages, we don't want to take focus in case the user has switched applications,
// so we use the custom form.
var form = formFactory.Create <FScanProgress>();
form.PageNumber = pageNumber;
form.EventLoop = eventLoop;
form.Format = format;
form.ShowDialog();
if (form.Exception != null)
{
WiaApi.ThrowDeviceError(form.Exception);
}
if (form.DialogResult == DialogResult.Cancel)
{
return(null);
}
return(form.ImageStream);
}
public void DoSync(Action <WiaState> action)
{
Exception error = null;
form.Invoke(new Action(() =>
{
try
{
if (wiaState == null)
{
wiaState = InitWia();
}
action(wiaState);
}
catch (Exception ex)
{
error = ex;
}
}));
if (error != null)
{
WiaApi.ThrowDeviceError(error);
}
}
