程序从C# winform 移植到 C++/CLR form 请教俩个问题


问题现象


C# winform 原代码

using System;
using System.Collections.Generic;
using using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using using System.Threading;

namespace FileCopyPlan
{
    public partial class Frm_Main : Form
    {
        public Frm_Main()
        {
            InitializeComponent();
        }
        private System.Threading.Thread thdAddFile; //创建一个线程
        private string str = "";
         FormerOpen;//实例化FileStream类
        FileStream ToFileOpen;//实例化FileStream类
        private void button1_Click(object sender, EventArgs e)
        {
            if (openFileDialog1.ShowDialog() == DialogResult.OK)//打开文件对话框
                textBox1.Text = openFileDialog1.FileName;//获取源文件的路径
        }

        private void button2_Click(object sender, EventArgs e)
        {
            if (folderBrowserDialog1.ShowDialog() == DialogResult.OK)//打开文件夹对话框
                textBox2.Text = folderBrowserDialog1.SelectedPath;//获取目的文件的路径
        }

        private void button3_Click(object sender, EventArgs e)
        {
            if (textBox1.Text.Length == 0 || textBox2.Text.Length == 0)
            {
                MessageBox.Show("请选择原文件路径或目的文件路径。");
                return;
            }
            str = textBox1.Text;//记录源文件的路径
            str = "\\" + str.Substring(str.LastIndexOf('\\') + 1, str.Length - str.LastIndexOf('\\') - 1);//获取源文件的名称
            thdAddFile = new Thread(new ThreadStart(SetAddFile));//创建一个线程
            thdAddFile.Start();//执行当前线程
        }
        public delegate void AddFile();//定义委托
        /// <summary>
        /// 在线程上执行委托
        /// </summary>
        public void SetAddFile()
        {
            this.Invoke(new AddFile(RunAddFile));//在线程上执行指定的委托
        }

        /// <summary>
        /// 对文件进行复制，并在复制完成后关闭线程
        /// </summary>
        public void RunAddFile()
        {
            CopyFile(textBox1.Text, textBox2.Text + str, 1024, progressBar1);//复制文件
            thdAddFile.Abort();//关闭线程
        }

        /// <summary>
        /// 文件的复制
        /// </summary>
        /// <param FormerFile="string">源文件路径</param>
        /// <param toFile="string">目的文件路径</param>
        /// <param SectSize="int">传输大小</param>
        /// <param progressBar="ProgressBar">ProgressBar控件</param>
        public void CopyFile(string FormerFile, string toFile, int SectSize, ProgressBar progressBar1)
        {
            progressBar1.Value = 0;//设置进度栏的当前位置为0
            progressBar1.Minimum = 0;//设置进度栏的最小值为0
            FileStream fileToCreate = new FileStream(toFile, FileMode.Create);//创建目的文件，如果已存在将被覆盖
            fileToCreate.Close();//关闭所有资源
            fileToCreate.Dispose();//释放所有资源
            FormerOpen = new FileStream(FormerFile, FileMode.Open, FileAccess.Read);//以只读方式打开源文件
            ToFileOpen = new FileStream(toFile, FileMode.Append, FileAccess.Write);//以写方式打开目的文件
            int max = Convert.ToInt32(Math.Ceiling((double)FormerOpen.Length / (double)SectSize));//根据一次传输的大小，计算传输的个数
            progressBar1.Maximum = max;//设置进度栏的最大值
            int FileSize;//要拷贝的文件的大小
            if (SectSize < FormerOpen.Length)//如果分段拷贝，即每次拷贝内容小于文件总长度
            {
                byte[] buffer = new byte[SectSize];//根据传输的大小，定义一个字节数组
                int copied = 0;//记录传输的大小
                int tem_n = 1;//设置进度栏中进度块的增加个数
                while (copied <= ((int)FormerOpen.Length - SectSize))//拷贝主体部分
                {
                    FileSize = FormerOpen.Read(buffer, 0, SectSize);//从0开始读，每次最大读SectSize
                    FormerOpen.Flush();//清空缓存
                    ToFileOpen.Write(buffer, 0, SectSize);//向目的文件写入字节
                    ToFileOpen.Flush();//清空缓存
                    ToFileOpen.Position = FormerOpen.Position;//使源文件和目的文件流的位置相同
                    copied += FileSize;//记录已拷贝的大小
                    progressBar1.Value = progressBar1.Value + tem_n;//增加进度栏的进度块
                }
                int left = (int)FormerOpen.Length - copied;//获取剩余大小
                FileSize = FormerOpen.Read(buffer, 0, left);//读取剩余的字节
                FormerOpen.Flush();//清空缓存
                ToFileOpen.Write(buffer, 0, left);//写入剩余的部分
                ToFileOpen.Flush();//清空缓存
            }
            else//如果整体拷贝，即每次拷贝内容大于文件总长度
            {
                byte[] buffer = new byte[FormerOpen.Length];//获取文件的大小
                FormerOpen.Read(buffer, 0, (int)FormerOpen.Length);//读取源文件的字节
                FormerOpen.Flush();//清空缓存
                ToFileOpen.Write(buffer, 0, (int)FormerOpen.Length);//写放字节
                ToFileOpen.Flush();//清空缓存
            }
            FormerOpen.Close();//释放所有资源
            ToFileOpen.Close();//释放所有资源
            if (MessageBox.Show("复制完成") == DialogResult.OK)//显示"复制完成"提示对话框
            {
                progressBar1.Value = 0;//设置进度栏的当有位置为0
                textBox1.Clear();//清空文本
                textBox2.Clear();
                str = "";
            }
        }
    }
}

移植到C++/CLR form后有问题的代码

#pragma once

namespace FileCopyPlan {

    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::IO; 
    using namespace System::Threading; 

    /// <summary>
    /// Frm_Main 摘要
    /// </summary>
    public ref class Frm_Main : public System::Windows::Forms::Form
    {
    public:
        Frm_Main(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>
        ~Frm_Main()
        {
            if (components)
            {
                delete components;
            }
        }
    private: System::Windows::Forms::Label^  label1;
    protected: 
    private: System::Windows::Forms::Label^  label2;
    private: System::Windows::Forms::TextBox^  textBox1;
    private: System::Windows::Forms::TextBox^  textBox2;
    private: System::Windows::Forms::Button^  button1;
    private: System::Windows::Forms::Button^  button2;
    private: System::Windows::Forms::ProgressBar^  progressBar1;
    private: System::Windows::Forms::Button^  button3;
    private: System::Windows::Forms::OpenFileDialog^  openFileDialog1;
    private: System::Windows::Forms::FolderBrowserDialog^  folderBrowserDialog1;

    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->label2 = (gcnew System::Windows::Forms::Label());
            this->textBox1 = (gcnew System::Windows::Forms::TextBox());
            this->textBox2 = (gcnew System::Windows::Forms::TextBox());
            this->button1 = (gcnew System::Windows::Forms::Button());
            this->button2 = (gcnew System::Windows::Forms::Button());
            this->progressBar1 = (gcnew System::Windows::Forms::ProgressBar());
            this->button3 = (gcnew System::Windows::Forms::Button());
            this->openFileDialog1 = (gcnew System::Windows::Forms::OpenFileDialog());
            this->folderBrowserDialog1 = (gcnew System::Windows::Forms::FolderBrowserDialog());
            this->SuspendLayout();
            // 
            // label1
            // 
            this->label1->AutoSize = true;
            this->label1->Location = System::Drawing::Point(11, 9);
            this->label1->Name = L"label1";
            this->label1->Size = System::Drawing::Size(65, 12);
            this->label1->TabIndex = 0;
            this->label1->Text = L"源文件路径";
            // 
            // label2
            // 
            this->label2->AutoSize = true;
            this->label2->Location = System::Drawing::Point(11, 66);
            this->label2->Name = L"label2";
            this->label2->Size = System::Drawing::Size(77, 12);
            this->label2->TabIndex = 1;
            this->label2->Text = L"文件保存路径";
            // 
            // textBox1
            // 
            this->textBox1->Location = System::Drawing::Point(13, 29);
            this->textBox1->Name = L"textBox1";
            this->textBox1->Size = System::Drawing::Size(476, 21);
            this->textBox1->TabIndex = 2;
            // 
            // textBox2
            // 
            this->textBox2->Location = System::Drawing::Point(13, 86);
            this->textBox2->Name = L"textBox2";
            this->textBox2->Size = System::Drawing::Size(476, 21);
            this->textBox2->TabIndex = 3;
            // 
            // button1
            // 
            this->button1->Location = System::Drawing::Point(495, 29);
            this->button1->Name = L"button1";
            this->button1->Size = System::Drawing::Size(75, 23);
            this->button1->TabIndex = 4;
            this->button1->Text = L"浏览";
            this->button1->UseVisualStyleBackColor = true;
            this->button1->Click += gcnew System::EventHandler(this, &Frm_Main::button1_Click);
            // 
            // button2
            // 
            this->button2->Location = System::Drawing::Point(495, 86);
            this->button2->Name = L"button2";
            this->button2->Size = System::Drawing::Size(75, 23);
            this->button2->TabIndex = 5;
            this->button2->Text = L"浏览";
            this->button2->UseVisualStyleBackColor = true;
            this->button2->Click += gcnew System::EventHandler(this, &Frm_Main::button2_Click);
            // 
            // progressBar1
            // 
            this->progressBar1->Location = System::Drawing::Point(13, 121);
            this->progressBar1->Name = L"progressBar1";
            this->progressBar1->Size = System::Drawing::Size(557, 19);
            this->progressBar1->TabIndex = 6;
            // 
            // button3
            // 
            this->button3->Location = System::Drawing::Point(254, 152);
            this->button3->Name = L"button3";
            this->button3->Size = System::Drawing::Size(75, 23);
            this->button3->TabIndex = 7;
            this->button3->Text = L"文件复制";
            this->button3->UseVisualStyleBackColor = true;
            this->button3->Click += gcnew System::EventHandler(this, &Frm_Main::button3_Click);
            // 
            // openFileDialog1
            // 
            this->openFileDialog1->FileName = L"openFileDialog1";
            // 
            // Frm_Main
            // 
            this->AutoScaleDimensions = System::Drawing::SizeF(6, 12);
            this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
            this->ClientSize = System::Drawing::Size(582, 185);
            this->Controls->Add(this->button3);
            this->Controls->Add(this->progressBar1);
            this->Controls->Add(this->button2);
            this->Controls->Add(this->button1);
            this->Controls->Add(this->textBox2);
            this->Controls->Add(this->textBox1);
            this->Controls->Add(this->label2);
            this->Controls->Add(this->label1);
            this->Name = L"Frm_Main";
            this->Text = L"Form1";
            this->ResumeLayout(false);
            this->PerformLayout();
        }
#pragma endregion

private: System::Threading::Thread^ thdAddFile; //创建一个线程
private: static String^ str = "";
        FileStream^ FormerOpen;//实例化FileStream类
        FileStream^ ToFileOpen;//实例化FileStream类
private: System::Void button1_Click(System::Object^  sender, System::EventArgs^  e)
         {
             if (openFileDialog1->ShowDialog() == Windows::Forms::DialogResult::OK)//打开文件对话框
                 textBox1->Text = openFileDialog1->FileName;//获取源文件的路径
         }
private: System::Void button2_Click(System::Object^  sender, System::EventArgs^  e) 
         {
             if (folderBrowserDialog1->ShowDialog() == Windows::Forms::DialogResult::OK)//打开文件夹对话框
                textBox2->Text = folderBrowserDialog1->SelectedPath;//获取目的文件的路径
         }
private: System::Void button3_Click(System::Object^  sender, System::EventArgs^  e) 
         {
             if (textBox1->Text->Length == 0 || textBox2->Text->Length == 0)
            {
                MessageBox::Show("请选择原文件路径或目的文件路径。");
                return;
            }
            str = textBox1->Text;//记录源文件的路径
            str = "\\" + str->Substring(str->LastIndexOf('\\') + 1, str->Length - str->LastIndexOf('\\') - 1);//获取源文件的名称
            thdAddFile = gcnew Thread(gcnew ThreadStart(&FileCopyPlan::Frm_Main::SetAddFile));//创建一个线程
            thdAddFile->Start();//执行当前线程
         }
        public: delegate void AddFile(void);//定义委托
        /// <summary>
        /// 在线程上执行委托
        /// </summary>
        public: void SetAddFile( void)
        {
            //this->Invoke(gcnew AddFile(RunAddFile));//在线程上执行指定的委托
            this->Invoke(gcnew AddFile(&FileCopyPlan::Frm_Main::RunAddFile));//在线程上执行指定的委托
        }
        /// <summary>
        /// 对文件进行复制，并在复制完成后关闭线程
        /// </summary>
        public: void RunAddFile()
        {
            CopyFile(textBox1->Text, textBox2->Text + str, 1024, progressBar1);//复制文件
            thdAddFile->Abort();//关闭线程
        }
/// <summary>
        /// 文件的复制
        /// </summary>
        /// <param FormerFile="string">源文件路径</param>
        /// <param toFile="string">目的文件路径</param>
        /// <param SectSize="int">传输大小</param>
        /// <param progressBar="ProgressBar">ProgressBar控件</param>
        public: void CopyFile(String^ FormerFile, String^ toFile, int SectSize, ProgressBar^ progressBar1)
        {
            progressBar1->Value = 0;//设置进度栏的当前位置为0
            progressBar1->Minimum = 0;//设置进度栏的最小值为0
            FileStream^ fileToCreate = gcnew FileStream(toFile, FileMode::Create);//创建目的文件，如果已存在将被覆盖
            fileToCreate->Close();//关闭所有资源
            fileToCreate->~FileStream();//Dispose();//释放所有资源
            FormerOpen = gcnew FileStream(FormerFile, FileMode::Open, FileAccess::Read);//以只读方式打开源文件
            ToFileOpen = gcnew FileStream(toFile, FileMode::Append, FileAccess::Write);//以写方式打开目的文件
            int max = Convert::ToInt32(Math::Ceiling((double)FormerOpen->Length / (double)SectSize));//根据一次传输的大小，计算传输的个数
            progressBar1->Maximum = max;//设置进度栏的最大值
            int FileSize;//要拷贝的文件的大小
            if (SectSize < FormerOpen->Length)//如果分段拷贝，即每次拷贝内容小于文件总长度
            {
                array<Byte>^buffer = gcnew array<Byte>(SectSize);//根据传输的大小，定义一个字节数组
                int copied = 0;//记录传输的大小
                int tem_n = 1;//设置进度栏中进度块的增加个数
                while (copied <= ((int)FormerOpen->Length - SectSize))//拷贝主体部分
                {
                    FileSize = FormerOpen->Read(buffer, 0, SectSize);//从0开始读，每次最大读SectSize
                    FormerOpen->Flush();//清空缓存
                    ToFileOpen->Write(buffer, 0, SectSize);//向目的文件写入字节
                    ToFileOpen->Flush();//清空缓存
                    ToFileOpen->Position = FormerOpen->Position;//使源文件和目的文件流的位置相同
                    copied += FileSize;//记录已拷贝的大小
                    progressBar1->Value = progressBar1->Value + tem_n;//增加进度栏的进度块
                }
                int left = (int)FormerOpen->Length - copied;//获取剩余大小
                FileSize = FormerOpen->Read(buffer, 0, left);//读取剩余的字节
                FormerOpen->Flush();//清空缓存
                ToFileOpen->Write(buffer, 0, left);//写入剩余的部分
                ToFileOpen->Flush();//清空缓存
            }
            else//如果整体拷贝，即每次拷贝内容大于文件总长度
            {
                array<Byte>^buffer = gcnew array<Byte>(FormerOpen->Length); //获取文件的大小
                FormerOpen->Read(buffer, 0, (int)FormerOpen->Length);//读取源文件的字节
                FormerOpen->Flush();//清空缓存
                ToFileOpen->Write(buffer, 0, (int)FormerOpen->Length);//写放字节
                ToFileOpen->Flush();//清空缓存
            }
            FormerOpen->Close();//释放所有资源
            ToFileOpen->Close();//释放所有资源
            if (MessageBox::Show("复制完成") == Windows::Forms::DialogResult::OK)//显示"复制完成"提示对话框
            {
                progressBar1->Value = 0;//设置进度栏的当有位置为0
                textBox1->Clear();//清空文本
                textBox2->Clear();
                str = "";
            }
        }
    };
}