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;

	using namespace System::Drawing::Imaging;

	/// <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::Button^  button1;
	private: System::Windows::Forms::Button^  button2;
	private: System::Windows::Forms::PictureBox^  pictureBox1;
	private: System::Windows::Forms::OpenFileDialog^  openFileDialog1;
	private: System::Windows::Forms::SaveFileDialog^  saveFileDialog1;

	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->button1 = (gcnew System::Windows::Forms::Button());
			this->button2 = (gcnew System::Windows::Forms::Button());
			this->pictureBox1 = (gcnew System::Windows::Forms::PictureBox());
			this->openFileDialog1 = (gcnew System::Windows::Forms::OpenFileDialog());
			this->saveFileDialog1 = (gcnew System::Windows::Forms::SaveFileDialog());
			(cli::safe_cast<System::ComponentModel::ISupportInitialize^  >(this->pictureBox1))->BeginInit();
			this->SuspendLayout();
			// 
			// label1
			// 
			this->label1->AutoSize = true;
			this->label1->Location = System::Drawing::Point(5, 9);
			this->label1->Name = L"label1";
			this->label1->Size = System::Drawing::Size(191, 12);
			this->label1->TabIndex = 0;
			this->label1->Text = L"设置图像格式转换质量值(1-100)：";
			// 
			// textBox1
			// 
			this->textBox1->Location = System::Drawing::Point(197, 5);
			this->textBox1->Name = L"textBox1";
			this->textBox1->Size = System::Drawing::Size(33, 21);
			this->textBox1->TabIndex = 1;
			this->textBox1->Text = L"25";
			// 
			// button1
			// 
			this->button1->Location = System::Drawing::Point(232, 3);
			this->button1->Name = L"button1";
			this->button1->Size = System::Drawing::Size(77, 23);
			this->button1->TabIndex = 2;
			this->button1->Text = L"选择图像";
			this->button1->UseVisualStyleBackColor = true;
			this->button1->Click += gcnew System::EventHandler(this, &Form1::button1_Click);
			// 
			// button2
			// 
			this->button2->Location = System::Drawing::Point(309, 3);
			this->button2->Name = L"button2";
			this->button2->Size = System::Drawing::Size(77, 23);
			this->button2->TabIndex = 3;
			this->button2->Text = L"转换图像";
			this->button2->UseVisualStyleBackColor = true;
			this->button2->Click += gcnew System::EventHandler(this, &Form1::button2_Click);
			// 
			// pictureBox1
			// 
			this->pictureBox1->Anchor = static_cast<System::Windows::Forms::AnchorStyles>((((System::Windows::Forms::AnchorStyles::Top | System::Windows::Forms::AnchorStyles::Bottom) 
				| System::Windows::Forms::AnchorStyles::Left) 
				| System::Windows::Forms::AnchorStyles::Right));
			this->pictureBox1->BorderStyle = System::Windows::Forms::BorderStyle::Fixed3D;
			this->pictureBox1->Location = System::Drawing::Point(3, 32);
			this->pictureBox1->Name = L"pictureBox1";
			this->pictureBox1->Size = System::Drawing::Size(383, 179);
			this->pictureBox1->TabIndex = 4;
			this->pictureBox1->TabStop = false;
			// 
			// openFileDialog1
			// 
			this->openFileDialog1->FileName = L"openFileDialog1";
			// 
			// Form1
			// 
			this->AutoScaleDimensions = System::Drawing::SizeF(6, 12);
			this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
			this->ClientSize = System::Drawing::Size(390, 214);
			this->Controls->Add(this->pictureBox1);
			this->Controls->Add(this->button2);
			this->Controls->Add(this->button1);
			this->Controls->Add(this->textBox1);
			this->Controls->Add(this->label1);
			this->Name = L"Form1";
			this->StartPosition = System::Windows::Forms::FormStartPosition::CenterScreen;
			this->Text = L"演示控制图像转换质量";
			(cli::safe_cast<System::ComponentModel::ISupportInitialize^  >(this->pictureBox1))->EndInit();
			this->ResumeLayout(false);
			this->PerformLayout();

		}
#pragma endregion
//选择图像
private: System::Void button1_Click(System::Object^  sender, System::EventArgs^  e) {
    this->openFileDialog1->Filter="所有图像文件(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(*.*)|*.*";
    this->openFileDialog1->Multiselect = false;
	if(this->openFileDialog1->ShowDialog()==System::Windows::Forms::DialogResult::OK)
    {
       String^ MyFileName = this->openFileDialog1->FileName;
	   this->pictureBox1->Image = Image::FromFile(MyFileName);
    } 
}
//转换图像
private: System::Void button2_Click(System::Object^  sender, System::EventArgs^  e) {
  String^ MyFileName;  
  ImageCodecInfo^ MyInfo;
  array<ImageCodecInfo^>^ MyInfos;
  int i;
  Encoder^ MyEncoder;
  EncoderParameter^ MyParam;
  EncoderParameters^ MyParams;
  if(this->pictureBox1->Image==nullptr)
      return;
  this->saveFileDialog1->Filter = "所有JPG图像文件(*.jpg)|*.jpg";
  if (this->saveFileDialog1->ShowDialog() ==System::Windows::Forms::DialogResult::Cancel)
      return;
  try
  {
    MyFileName=this->saveFileDialog1->FileName;
	MyInfos=ImageCodecInfo::GetImageEncoders();
    MyInfo = MyInfos[0];
    for(i=0;i<MyInfos.Length;i++)
    {
      if(MyInfos[i]->MimeType=="image/jpeg")
          MyInfo=MyInfos[i];
    }
	MyEncoder=Encoder::Quality;
    MyParams=gcnew EncoderParameters();
    MyParam=gcnew EncoderParameter(MyEncoder,System::Convert::ToInt64(this->textBox1->Text));
    MyParams->Param[0]=MyParam;
    this->pictureBox1->Image->Save(MyFileName,MyInfo,MyParams);
	MessageBox::Show("图像转换操作成功！","信息提示", MessageBoxButtons::OK, MessageBoxIcon::Information);
  }
  catch (Exception^ MyEx)
  {
	  MessageBox::Show(MyEx->Message,"信息提示", MessageBoxButtons::OK, MessageBoxIcon::Information);
  }
}
};
}