基本上,我正在使用的程序是一个C#控制台应用程序,它通过套接字监听请求。建立连接后,它将调用并显示一个名为 frmPdfViewer 的Windows窗体。
在 frmPdfViewer 中,有一个名为 Sign 的ToolStripMenuItem。单击后,它应显示一个签名弹出窗口,供用户签名。
现在,我的问题是,当我单击 Sign ToolStripMenuItem时,表单冻结,并且不显示签名弹出窗口。没有引发任何错误或异常,它只是冻结。但是,当我单击 Sign 后尝试隐藏 frmPdfViewer 时,会出现签名弹出窗口。
为什么会有这种行为?
这是套接字代码的片段(在内部 ProcReq()方法是调用表单的地方):
var wsURI = ConfigurationManager.AppSettings["wsURI"];
var id = ConfigurationManager.AppSettings["id"];
var ns = ConfigurationManager.AppSettings["namespace"];
var type = ConfigurationManager.AppSettings["type"];
var socket = IO.Socket(wsURI + "/" + ns);
socket.On(Socket.EVENT_CONNECT, () =>
{
// Construct Push Message for Device Registration
JObject reg = MessageFactory.CreateRegistrationMessage(id,
"RR_" + id, type);
socket.Emit("peripheral/registration", JsonConvert.SerializeObject(reg));
socket.On(ns + "/RR_" + id, (reqMsg) =>
{
JObject req = reqMsg as JObject;
JObject reqHeader = (JObject)req["header"];
RespPayload respPayload = TabletTerminal.GetInstance().ProcReq(req);
JObject resp = new JObject();
resp.Add("header", reqHeader);
resp.Add("payload", JObject.FromObject(respPayload));
var jsonResp = JsonConvert.SerializeObject(resp);
socket.Emit(ns + "/RR_" + id, jsonResp);
});
})
以下是ProcReq方法的代码段(将在此处调用表单):
public SignatureRespPayload ProcReq(JObject req)
{
SignatureRespPayload signatureRespPayload = new SignatureRespPayload();
JObject reqPayload = req.GetValue("payload") as JObject;
string name = (string)reqPayload["name"];
string reason = (string)reqPayload["reason"];
string pdfPath = (string)reqPayload["pdfPath"];
frmPdfViewer pdfViewer = new frmPdfViewer(name, reason, pdfPath);
pdfViewer.ShowDialog();
signatureRespPayload.returnValue = pdfViewer.returnValue;
if (signatureRespPayload.returnValue)
{
signatureRespPayload.signedPdfPath = pdfViewer.signedPdfPath;
}
else
{
signatureRespPayload.errorMessage = pdfViewer.errorMessage;
}
pdfViewer.Dispose();
return signatureRespPayload;
}
这是frmPdfViewer中的点击事件的代码段:
(注意:,我使用的是第三方叫作Wacom签名SDK的SDK,只能查看其方法的接口而不是实现。显示签名弹出窗口的方法是 Capture())
try
{
SigCtl sigCtl = new SigCtl();
sigCtl.Licence = Properties.Settings.Default.License;
DynamicCapture dc = new DynamicCaptureClass();
DynamicCaptureResult res = dc.Capture(sigCtl, name, reason, null, null);
if (res == DynamicCaptureResult.DynCaptOK)
{
SigObj sigObj = (SigObj)sigCtl.Signature;
String filename = System.IO.Path.GetTempFileName();
sigObj.RenderBitmap(filename, 400, 200, "image/png", 0.5f, 0xff0000, 0xffffff, 10.0f, 10.0f, RBFlags.RenderOutputFilename | RBFlags.RenderColor32BPP | RBFlags.RenderEncodeData | RBFlags.RenderBackgroundTransparent);
string newFile = InsertSignatureImageToPdf(filename);
loadPdf(newFile, false);
}
}
catch (Exception ex)
{
Console.Write(ex.StackTrace);
MessageBox.Show(ex.Message);
}
注意:当我在Capture()方法之前放置一个断点然后继续运行程序时,也会弹出签名弹出窗口。
答案 0 :(得分:1)
显示表单后,您可以尝试添加formvariable.BringToFront()
。