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請看看下面的代碼Windows窗體中，無法顯示
#pragma once
#include "Email.h"
using namespace System::ComponentModel;
using namespace System::Collections;
using namespace System::Windows::Forms;
using namespace System::Data;
using namespace System::Threading;
using namespace SMSLib;
/// <summary>
/// Summary for NotifyAlarm
/// </summary>
public ref class NotifyAlarm : public System::Windows::Forms::Form
{
int count;
Email ^email;
public:
NotifyAlarm(void)
{
InitializeComponent();
//
//TODO: Add the constructor code here
//
count = 10;
//email = gcnew Email();
}
protected:
/// <summary>
/// Clean up any resources being used.
/// </summary>
~NotifyAlarm()
{
if (components)
{
delete components;
}
}
private: System::Windows::Forms::Label^ label1;
protected:
private: System::Windows::Forms::Label^ secondsLabel;
private: System::Windows::Forms::Label^ label2;
private: System::Windows::Forms::Button^ sendNowBtn;
private: System::Windows::Forms::Button^ cancelBtn;
private: System::Windows::Forms::Timer^ timer1;
private: System::ComponentModel::IContainer^ components;
private:
/// <summary>
/// Required designer variable.
/// </summary>
#pragma region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
void InitializeComponent(void)
{
this->components = (gcnew System::ComponentModel::Container());
this->label1 = (gcnew System::Windows::Forms::Label());
this->secondsLabel = (gcnew System::Windows::Forms::Label());
this->label2 = (gcnew System::Windows::Forms::Label());
this->sendNowBtn = (gcnew System::Windows::Forms::Button());
this->cancelBtn = (gcnew System::Windows::Forms::Button());
this->timer1 = (gcnew System::Windows::Forms::Timer(this->components));
this->SuspendLayout();
//
// label1
//
this->label1->AutoSize = true;
this->label1->Font = (gcnew System::Drawing::Font(L"Microsoft Sans Serif", 12, System::Drawing::FontStyle::Regular, System::Drawing::GraphicsUnit::Point,
static_cast<System::Byte>(0)));
this->label1->Location = System::Drawing::Point(13, 27);
this->label1->Name = L"label1";
this->label1->Size = System::Drawing::Size(405, 20);
this->label1->TabIndex = 0;
this->label1->Text = L"Intruder Detected. An Email and SMS will be sent within ";
//
// secondsLabel
//
this->secondsLabel->AutoSize = true;
this->secondsLabel->Font = (gcnew System::Drawing::Font(L"Microsoft Sans Serif", 12, System::Drawing::FontStyle::Regular, System::Drawing::GraphicsUnit::Point,
static_cast<System::Byte>(0)));
this->secondsLabel->ForeColor = System::Drawing::Color::Red;
this->secondsLabel->Location = System::Drawing::Point(408, 27);
this->secondsLabel->Name = L"secondsLabel";
this->secondsLabel->Size = System::Drawing::Size(51, 20);
this->secondsLabel->TabIndex = 1;
this->secondsLabel->Text = L"label2";
//
// label2
//
this->label2->AutoSize = true;
this->label2->Font = (gcnew System::Drawing::Font(L"Microsoft Sans Serif", 12, System::Drawing::FontStyle::Regular, System::Drawing::GraphicsUnit::Point,
static_cast<System::Byte>(0)));
this->label2->Location = System::Drawing::Point(465, 27);
this->label2->Name = L"label2";
this->label2->Size = System::Drawing::Size(69, 20);
this->label2->TabIndex = 2;
this->label2->Text = L"seconds";
//
// sendNowBtn
//
this->sendNowBtn->Location = System::Drawing::Point(370, 70);
this->sendNowBtn->Name = L"sendNowBtn";
this->sendNowBtn->Size = System::Drawing::Size(75, 23);
this->sendNowBtn->TabIndex = 3;
this->sendNowBtn->Text = L"Send Now";
this->sendNowBtn->UseVisualStyleBackColor = true;
this->sendNowBtn->Click += gcnew System::EventHandler(this, &NotifyAlarm::sendNowBtn_Click);
//
// cancelBtn
//
this->cancelBtn->Location = System::Drawing::Point(469, 70);
this->cancelBtn->Name = L"cancelBtn";
this->cancelBtn->Size = System::Drawing::Size(75, 23);
this->cancelBtn->TabIndex = 4;
this->cancelBtn->Text = L"Cancel";
this->cancelBtn->UseVisualStyleBackColor = true;
this->cancelBtn->Click += gcnew System::EventHandler(this, &NotifyAlarm::cancelBtn_Click);
//
// timer1
//
this->timer1->Enabled = true;
this->timer1->Interval = 1000;
this->timer1->Tick += gcnew System::EventHandler(this, &NotifyAlarm::timer1_Tick);
//
// NotifyAlarm
//
this->AutoScaleDimensions = System::Drawing::SizeF(6, 13);
this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
this->ClientSize = System::Drawing::Size(566, 105);
this->Controls->Add(this->cancelBtn);
this->Controls->Add(this->sendNowBtn);
this->Controls->Add(this->label2);
this->Controls->Add(this->secondsLabel);
this->Controls->Add(this->label1);
this->Name = L"NotifyAlarm";
this->Text = L"NotifyAlarm";
this->ResumeLayout(false);
this->PerformLayout();
}
#pragma endregion
private: System::Void timer1_Tick(System::Object^ sender, System::EventArgs^ e)
{
count--;
DoUpdateText(count);
}
private: System::Void sendNowBtn_Click(System::Object^ sender, System::EventArgs^ e)
{
timer1->Stop();
}
public: System::Void showGUI()
{
this->Show();
}
private: System::Void cancelBtn_Click(System::Object^ sender, System::EventArgs^ e)
{
timer1->Stop();
this->Close();
}
delegate void UpdateTextDelegate(int count);
private: void DoUpdateText(int count)
{
ISynchronizeInvoke^ i = this;
if (i->InvokeRequired)
{
UpdateTextDelegate^ tempDelegate =
gcnew UpdateTextDelegate(this, &NotifyAlarm::DoUpdateText);
cli::array<System::Object^>^ args = gcnew cli::array<System::Object^>(1);
args[0] = count;
i->BeginInvoke(tempDelegate, args);
return;
}
if(count>0 || count==0)
{
secondsLabel->Text = ""+count;
}
else
{
timer1->Stop();
this->Close();
}
}
};
上面的代碼顯示了用於生成通知的Windows窗體。我在另一個線程中運行這個類。下面是我如何設置另一類內的線程
na = gcnew NotifyAlarm();
Thread ^t = gcnew Thread(gcnew System::Threading::ThreadStart(na,&NotifyAlarm::showGUI));
t->Start();
我遇到的問題是，表單顯示正常，但一秒後，它消失。無論在表單中運行的進程是否正在運行，但在後臺運行，沒有顯示錶單。
講究這裏：
delegate void UpdateTextDelegate(int count);
private: void DoUpdateText(int count)
{
ISynchronizeInvoke^ i = this;
if (i->InvokeRequired)
{
UpdateTextDelegate^ tempDelegate =
gcnew UpdateTextDelegate(this, &NotifyAlarm::DoUpdateText);
cli::array<System::Object^>^ args = gcnew cli::array<System::Object^>(1);
args[0] = count;
i->BeginInvoke(tempDelegate, args);
return;
}
if(count>0 || count==0)
{
secondsLabel->Text = ""+count;
}
else
{
timer1->Stop();
this->Close();
}
}
};
這其中內螺紋的形式工作情況。
對我來說，在另一個線程中顯示此表單非常重要。爲什麼它正在消失？
UPDATE
使用
System::Void showGUI() {
Application::Run(*this);
}
後，我得到這個錯誤
1>c:\users\yohan\documents\visual studio 2010\projects\ eesystem\eesystem\NotifyAlarm.h(182): error C2665: 'System::Windows::Forms::Application::Run' : none of the 3 overloads could convert all the argument types
1> c:\program files\reference assemblies\microsoft\framework\.netframework\v4.0\system.windows.forms.dll: could be 'void System::Windows::Forms::Application::Run(System::Windows::Forms::Form ^)'
1> c:\program files\reference assemblies\microsoft\framework\.netframework\v4.0\system.windows.forms.dll: or 'void System::Windows::Forms::Application::Run(System::Windows::Forms::ApplicationContext ^)'
1> while trying to match the argument list '(NotifyAlarm)'
你忽略了你之前得到的建議。當你不使用答案時，提問並沒有太多意義。 –
@HansPassant：不，我沒有。我正在使用第二個答案！我檢查了語音識別的問題，並且我已經爲引擎使用了異步方法。所以，我不得不與第二個答案:) –