form1.h

《VC++2005编程实例》第二章的源代码

#pragma once


namespace Example {

	using namespace System;
	using namespace System::ComponentModel;
	using namespace System::Collections;
	using namespace System::Windows::Forms;
	using namespace System::Data;
	using namespace System::Drawing;

	/// <summary>
	/// Form1 摘要
	///
	/// 警告: 如果更改此类的名称，则需要更改
	///          与此类所依赖的所有 .resx 文件关联的托管资源编译器工具的
	///          “资源文件名”属性。否则，
	///          设计器将不能与此窗体的关联
	///          本地化资源正确交互。
	/// </summary>
	public ref class Form1 : public System::Windows::Forms::Form
	{
	public:
		Form1(void)
		{
			InitializeComponent();
			//
			//TODO: 在此处添加构造函数代码
			//
		}

	protected:
		/// <summary>
		/// 清理所有正在使用的资源。
		/// </summary>
		~Form1()
		{
			if (components)
			{
				delete components;
			}
		}
	private: System::Windows::Forms::Label^  label1;
	protected: 
	private: System::Windows::Forms::TextBox^  textBox1;
	private: System::Windows::Forms::TextBox^  textBox2;
	private: System::Windows::Forms::Label^  label2;
	private: System::Windows::Forms::Label^  label3;
	private: System::Windows::Forms::ProgressBar^  progressBar1;
	private: System::Windows::Forms::Button^  button1;
	private: System::Windows::Forms::Button^  button2;
	private: System::ComponentModel::BackgroundWorker^  backgroundWorker1;

	private:
		/// <summary>
		/// 必需的设计器变量。
		/// </summary>
		System::ComponentModel::Container ^components;

#pragma region Windows Form Designer generated code
		/// <summary>
		/// 设计器支持所需的方法 - 不要
		/// 使用代码编辑器修改此方法的内容。
		/// </summary>
		void InitializeComponent(void)
		{
			this->label1 = (gcnew System::Windows::Forms::Label());
			this->textBox1 = (gcnew System::Windows::Forms::TextBox());
			this->textBox2 = (gcnew System::Windows::Forms::TextBox());
			this->label2 = (gcnew System::Windows::Forms::Label());
			this->label3 = (gcnew System::Windows::Forms::Label());
			this->progressBar1 = (gcnew System::Windows::Forms::ProgressBar());
			this->button1 = (gcnew System::Windows::Forms::Button());
			this->button2 = (gcnew System::Windows::Forms::Button());
			this->backgroundWorker1 = (gcnew System::ComponentModel::BackgroundWorker());
			this->SuspendLayout();
			// 
			// label1
			// 
			this->label1->AutoSize = true;
			this->label1->Location = System::Drawing::Point(28, 33);
			this->label1->Name = L"label1";
			this->label1->Size = System::Drawing::Size(65, 12);
			this->label1->TabIndex = 0;
			this->label1->Text = L"计算基数：";
			// 
			// textBox1
			// 
			this->textBox1->Location = System::Drawing::Point(100, 28);
			this->textBox1->Name = L"textBox1";
			this->textBox1->Size = System::Drawing::Size(265, 21);
			this->textBox1->TabIndex = 1;
			this->textBox1->Text = L"38";
			// 
			// textBox2
			// 
			this->textBox2->Location = System::Drawing::Point(100, 55);
			this->textBox2->Name = L"textBox2";
			this->textBox2->Size = System::Drawing::Size(265, 21);
			this->textBox2->TabIndex = 3;
			// 
			// label2
			// 
			this->label2->AutoSize = true;
			this->label2->Location = System::Drawing::Point(28, 60);
			this->label2->Name = L"label2";
			this->label2->Size = System::Drawing::Size(65, 12);
			this->label2->TabIndex = 2;
			this->label2->Text = L"计算结果：";
			// 
			// label3
			// 
			this->label3->AutoSize = true;
			this->label3->Location = System::Drawing::Point(28, 87);
			this->label3->Name = L"label3";
			this->label3->Size = System::Drawing::Size(65, 12);
			this->label3->TabIndex = 4;
			this->label3->Text = L"计算进度：";
			// 
			// progressBar1
			// 
			this->progressBar1->Location = System::Drawing::Point(100, 82);
			this->progressBar1->Name = L"progressBar1";
			this->progressBar1->Size = System::Drawing::Size(265, 23);
			this->progressBar1->TabIndex = 5;
			// 
			// button1
			// 
			this->button1->Location = System::Drawing::Point(66, 114);
			this->button1->Name = L"button1";
			this->button1->Size = System::Drawing::Size(109, 23);
			this->button1->TabIndex = 6;
			this->button1->Text = L"开始计算";
			this->button1->UseVisualStyleBackColor = true;
			this->button1->Click += gcnew System::EventHandler(this, &Form1::button1_Click);
			// 
			// button2
			// 
			this->button2->Location = System::Drawing::Point(212, 114);
			this->button2->Name = L"button2";
			this->button2->Size = System::Drawing::Size(109, 23);
			this->button2->TabIndex = 7;
			this->button2->Text = L"取消计算";
			this->button2->UseVisualStyleBackColor = true;
			this->button2->Click += gcnew System::EventHandler(this, &Form1::button2_Click);
			// 
			// backgroundWorker1
			// 
			this->backgroundWorker1->WorkerReportsProgress = true;
			this->backgroundWorker1->WorkerSupportsCancellation = true;
			this->backgroundWorker1->DoWork += gcnew System::ComponentModel::DoWorkEventHandler(this, &Form1::backgroundWorker1_DoWork);
			this->backgroundWorker1->RunWorkerCompleted += gcnew System::ComponentModel::RunWorkerCompletedEventHandler(this, &Form1::backgroundWorker1_RunWorkerCompleted);
			this->backgroundWorker1->ProgressChanged += gcnew System::ComponentModel::ProgressChangedEventHandler(this, &Form1::backgroundWorker1_ProgressChanged);
			// 
			// Form1
			// 
			this->AutoScaleDimensions = System::Drawing::SizeF(6, 12);
			this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
			this->ClientSize = System::Drawing::Size(390, 163);
			this->Controls->Add(this->button2);
			this->Controls->Add(this->button1);
			this->Controls->Add(this->progressBar1);
			this->Controls->Add(this->label3);
			this->Controls->Add(this->textBox2);
			this->Controls->Add(this->label2);
			this->Controls->Add(this->textBox1);
			this->Controls->Add(this->label1);
			this->Name = L"Form1";
			this->StartPosition = System::Windows::Forms::FormStartPosition::CenterScreen;
			this->Text = L"演示使用BackgroundWorker异步计算菲波拉叶数";
			this->ResumeLayout(false);
			this->PerformLayout();

		}
#pragma endregion
	private: static int MyBaseNumber = 0;
	private: static int MyPercentage = 0;
	//计算菲波拉叶数
	private:long ComputeFibonacci(int n, BackgroundWorker^ MyWorker, DoWorkEventArgs^ e)
	{           
		long MyResult= 0;
		if (MyWorker->CancellationPending)
		{
			e->Cancel = true;
		}
		else
		{
			if (n < 2)
			{
				MyResult= 1;
			}
			else
			{
				MyResult= ComputeFibonacci(n - 1, MyWorker, e) + ComputeFibonacci(n - 2, MyWorker, e);
			}
			int MyPercentComplete=(int)((float)n / (float)MyBaseNumber * 100);
			if (MyPercentComplete > MyPercentage)
			{
				MyPercentage = MyPercentComplete;
				MyWorker->ReportProgress(MyPercentComplete);
			}
		}
		return MyResult;
	}
	//开始计算
	private: System::Void button1_Click(System::Object^  sender, System::EventArgs^  e) {
  try
   {
	   MyBaseNumber = Convert::ToInt16(this->textBox1->Text);
       if ((MyBaseNumber < 0) || (MyBaseNumber > 91))
       {
		   MessageBox::Show("计算基数应在1-91之间！", "信息提示", MessageBoxButtons::OK, MessageBoxIcon::Information);
           return;
        }
        MyPercentage = 0;
        backgroundWorker1->RunWorkerAsync(MyBaseNumber);
     }
     catch (Exception^ MyEx)
     {
		 MessageBox::Show(MyEx->Message, "信息提示", MessageBoxButtons::OK, MessageBoxIcon::Information);
     }
 }
    //取消计算
private: System::Void button2_Click(System::Object^  sender, System::EventArgs^  e) {
   if (this->backgroundWorker1->IsBusy)
    {
       this->backgroundWorker1->CancelAsync();
     }
    else
    {
		MessageBox::Show("没有计算操作！", "信息提示", MessageBoxButtons::OK, MessageBoxIcon::Information);
    }
 }
private: System::Void backgroundWorker1_ProgressChanged(System::Object^  sender, System::ComponentModel::ProgressChangedEventArgs^  e) {
			  this->progressBar1->Value = e->ProgressPercentage;
		 }
private: System::Void backgroundWorker1_DoWork(System::Object^  sender, System::ComponentModel::DoWorkEventArgs^  e) {
			   BackgroundWorker^ worker = (BackgroundWorker^)sender ;            
			   e->Result= ComputeFibonacci((int)e->Argument, worker, e);
		 }
private: System::Void backgroundWorker1_RunWorkerCompleted(System::Object^  sender, System::ComponentModel::RunWorkerCompletedEventArgs^  e) {
	   if (e->Error != nullptr)
	   {
		   MessageBox::Show(e->Error->Message,"信息提示", MessageBoxButtons::OK, MessageBoxIcon::Information);
		}
		else if (e->Cancelled)
		{
			MessageBox::Show("计算操作被取消！", "信息提示", MessageBoxButtons::OK, MessageBoxIcon::Information);
		}
		else
		{
			this->textBox2->Text = e->Result->ToString();
		}
		 }
};
}