form1.h

《VC++2005编程实例》第三章的源代码

#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::PictureBox^  pictureBox1;
	private: System::Windows::Forms::Label^  label1;
	private: System::Windows::Forms::TextBox^  textBox1;
	private: System::Windows::Forms::Button^  button1;
	private: System::Windows::Forms::Label^  label2;
	private: System::Windows::Forms::ProgressBar^  progressBar1;
	private: System::Windows::Forms::Button^  button2;
	protected: 

	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->pictureBox1 = (gcnew System::Windows::Forms::PictureBox());
			this->label1 = (gcnew System::Windows::Forms::Label());
			this->textBox1 = (gcnew System::Windows::Forms::TextBox());
			this->button1 = (gcnew System::Windows::Forms::Button());
			this->label2 = (gcnew System::Windows::Forms::Label());
			this->progressBar1 = (gcnew System::Windows::Forms::ProgressBar());
			this->button2 = (gcnew System::Windows::Forms::Button());
			(cli::safe_cast<System::ComponentModel::ISupportInitialize^  >(this->pictureBox1))->BeginInit();
			this->SuspendLayout();
			// 
			// pictureBox1
			// 
			this->pictureBox1->BorderStyle = System::Windows::Forms::BorderStyle::Fixed3D;
			this->pictureBox1->Location = System::Drawing::Point(1, 2);
			this->pictureBox1->Name = L"pictureBox1";
			this->pictureBox1->Size = System::Drawing::Size(388, 169);
			this->pictureBox1->TabIndex = 0;
			this->pictureBox1->TabStop = false;
			this->pictureBox1->LoadProgressChanged += gcnew System::ComponentModel::ProgressChangedEventHandler(this, &Form1::pictureBox1_LoadProgressChanged);
			this->pictureBox1->LoadCompleted += gcnew System::ComponentModel::AsyncCompletedEventHandler(this, &Form1::pictureBox1_LoadCompleted);
			// 
			// label1
			// 
			this->label1->AutoSize = true;
			this->label1->Location = System::Drawing::Point(2, 183);
			this->label1->Name = L"label1";
			this->label1->Size = System::Drawing::Size(77, 12);
			this->label1->TabIndex = 1;
			this->label1->Text = L"图像文件名：";
			// 
			// textBox1
			// 
			this->textBox1->Location = System::Drawing::Point(85, 178);
			this->textBox1->Name = L"textBox1";
			this->textBox1->Size = System::Drawing::Size(225, 21);
			this->textBox1->TabIndex = 2;
			// 
			// button1
			// 
			this->button1->Location = System::Drawing::Point(314, 176);
			this->button1->Name = L"button1";
			this->button1->Size = System::Drawing::Size(75, 23);
			this->button1->TabIndex = 3;
			this->button1->Text = L"装载图像";
			this->button1->UseVisualStyleBackColor = true;
			this->button1->Click += gcnew System::EventHandler(this, &Form1::button1_Click);
			// 
			// label2
			// 
			this->label2->AutoSize = true;
			this->label2->Location = System::Drawing::Point(2, 206);
			this->label2->Name = L"label2";
			this->label2->Size = System::Drawing::Size(65, 12);
			this->label2->TabIndex = 4;
			this->label2->Text = L"装载进度：";
			// 
			// progressBar1
			// 
			this->progressBar1->Location = System::Drawing::Point(85, 200);
			this->progressBar1->Name = L"progressBar1";
			this->progressBar1->Size = System::Drawing::Size(225, 23);
			this->progressBar1->TabIndex = 5;
			// 
			// button2
			// 
			this->button2->Location = System::Drawing::Point(314, 201);
			this->button2->Name = L"button2";
			this->button2->Size = System::Drawing::Size(75, 23);
			this->button2->TabIndex = 6;
			this->button2->Text = L"取消装载";
			this->button2->UseVisualStyleBackColor = true;
			this->button2->Click += gcnew System::EventHandler(this, &Form1::button2_Click);
			// 
			// Form1
			// 
			this->AutoScaleDimensions = System::Drawing::SizeF(6, 12);
			this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
			this->ClientSize = System::Drawing::Size(390, 225);
			this->Controls->Add(this->button2);
			this->Controls->Add(this->progressBar1);
			this->Controls->Add(this->label2);
			this->Controls->Add(this->button1);
			this->Controls->Add(this->textBox1);
			this->Controls->Add(this->label1);
			this->Controls->Add(this->pictureBox1);
			this->Name = L"Form1";
			this->StartPosition = System::Windows::Forms::FormStartPosition::CenterScreen;
			this->Text = L"演示异步装载大图像文件";
			(cli::safe_cast<System::ComponentModel::ISupportInitialize^  >(this->pictureBox1))->EndInit();
			this->ResumeLayout(false);
			this->PerformLayout();

		}
#pragma endregion
	//装载图像
private: System::Void button1_Click(System::Object^  sender, System::EventArgs^  e) {
   OpenFileDialog^ MyDlg = gcnew OpenFileDialog();
   MyDlg->Filter = "图像文件 (JPeg, Gif, Bmp, etc.)|*.jpg;*.jpeg;*.gif;*.bmp;*.tif; *.tiff; *.png| JPeg图像文件(*.jpg;*.jpeg)| *.jpg;*.jpeg |GIF图像文件(*.gif)|*.gif |BMP图像文件(*.bmp)|*.bmp|Tiff图像文件(*.tif;*.tiff)|*.tif;*.tiff|Png图像文件(*.png)| *.png |所有文件(*.*)|*.*";
   MyDlg->CheckFileExists = true;
   if (MyDlg->ShowDialog() == System::Windows::Forms::DialogResult::OK)
   {
       String^ MyFile = MyDlg->FileName;
       this->textBox1->Text = MyFile;
       this->pictureBox1->LoadAsync(MyFile);
    }
}
//取消装载
private: System::Void button2_Click(System::Object^  sender, System::EventArgs^  e) {
  this->pictureBox1->CancelAsync();
		 }
//显示图像文件装载进度
private: System::Void pictureBox1_LoadProgressChanged(System::Object^  sender, System::ComponentModel::ProgressChangedEventArgs^  e) {
   this->progressBar1->Value = e->ProgressPercentage;
		 }
//显示图像文件装载结果
private: System::Void pictureBox1_LoadCompleted(System::Object^  sender, System::ComponentModel::AsyncCompletedEventArgs^  e) {
   if (e->Error != nullptr)
   {
	   MessageBox::Show(e->Error->Message, "信息提示", MessageBoxButtons::OK, MessageBoxIcon::Information);
   }
   else if ((e->Cancelled == true))
   {
	   MessageBox::Show("异步装载图像操作被取消！", "信息提示", MessageBoxButtons::OK, MessageBoxIcon::Information);
   }
   else
   {
	   MessageBox::Show("异步装载图像操作成功操作完成！", "信息提示", MessageBoxButtons::OK, MessageBoxIcon::Information);
   }
}
};
}