C++で動的にlinklabels/Buttonのキューを作成するフォーム

Question

Winform、C++でダイナミックにlinklabels/Buttonのキューを作成したい。ボタンをクリックすると、link1としてlinklabelが動的に表示されます。ボタンを2回目にクリックすると、link1が下に、link2がlink1の上に表示されます。 3回目のボタンをクリックすると、link1がドロップダウンし、link2はlink1の位置になり、link3はlink2の位置になります。それはキューのように見ることができます。キューには5つの項目があり、6回目にボタンをクリックすると、リンク1が消え、リンク6が上に表示されます。これは続けています。

私はいくつかのタスクを完了しました。私は動的にリンクラベルを作成しています。ボタンをクリックするたびにすべてのリンクラベルを削除し、クリック数に基づいて位置を並べ替えて再作成することを考えました。しかし、リンクラベルは削除できませんでした。私も別のリンクラベルの上に新しいリンクラベルを上書きしようとしましたが、上のリンクラベルは消えてしまい、上書きされたリンクラベルをクリックすると例外エラーが表示されます。

Answer 1

`void History_Links() 
{ 
       string name=record[0]; 
       LinkLabel^ lbl=gcnew LinkLabel(); 
       lbl->Parent=this; 
       lbl->Location=System::Drawing::Point(10,300+(no_of_clicks-1)*15); 
       lbl->Size=System::Drawing::Size(55,15); 
       lbl->Name=gcnew String(link_names[no_of_clicks-1].c_str()); 
       lbl->Text= gcnew String(name.c_str()); 
       lbl->AutoSize = true; 


       switch(no_of_clicks) 
       { 
        case 1 : 
         lbl->LinkClicked += gcnew System::Windows::Forms::LinkLabelLinkClickedEventHandler(this, &Form1::history1_LinkClicked); 
         break; 
        case 2 : 
         //lbl->Clear(); 
         lbl->LinkClicked += gcnew System::Windows::Forms::LinkLabelLinkClickedEventHandler(this, &Form1::history2_LinkClicked); 
         break; 
        case 3 : 
         lbl->LinkClicked += gcnew System::Windows::Forms::LinkLabelLinkClickedEventHandler(this, &Form1::history3_LinkClicked); 
         break; 
        case 4 : 
         lbl->LinkClicked += gcnew System::Windows::Forms::LinkLabelLinkClickedEventHandler(this, &Form1::history4_LinkClicked); 
         break; 
        case 5 : 
         lbl->LinkClicked += gcnew System::Windows::Forms::LinkLabelLinkClickedEventHandler(this, &Form1::history5_LinkClicked); 
         break; 
        } 

}` 

Answer 2

#pragma once 
#include "stdafx.h" 
#include <sstream> 
#include <fstream> 
#include <vcclr.h> 
//#include <msclr\marshal_cppstd.h> 
//#include <chrono> 
//using namespace msclr::interop; 

namespace HistoryTracker { 

    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 std; 
    using namespace Runtime::InteropServices; 

    string history[1000],record[50]; 
    //string link_names[5]={"history1","history2","history3","history4","history5"}; 
    int no_of_clicks=0; 

    /// <summary> 
    /// Summary for Form1 
    /// </summary> 
    public ref class Form1 : public System::Windows::Forms::Form 
    { 
    public: 
     Form1(void) 
     { 
      InitializeComponent(); 
      // 
      //TODO: Add the constructor code here 
      // 
     } 

    protected: 
     /// <summary> 
     /// Clean up any resources being used. 
     /// </summary> 
     ~Form1() 
     { 
      if (components) 
      { 
       delete components; 
      } 
     } 
    private: System::Windows::Forms::Button^ button1; 
    private: AxAcroPDFLib::AxAcroPDF^ axAcroPDF1; 
    private: System::Windows::Forms::Label^ label1; 
    private: System::Windows::Forms::Button^ button2; 
    private: System::Windows::Forms::LinkLabel^ linkLabel1; 
    private: System::Windows::Forms::LinkLabel^ linkLabel2; 
    private: System::Windows::Forms::LinkLabel^ linkLabel3; 
    private: System::Windows::Forms::LinkLabel^ linkLabel4; 
    private: System::Windows::Forms::LinkLabel^ linkLabel5; 



    protected: 

    private: 
     /// <summary> 
     /// Required designer variable. 
     /// </summary> 
     System::ComponentModel::Container ^components; 

#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) 
     { 
      System::ComponentModel::ComponentResourceManager^ resources = (gcnew System::ComponentModel::ComponentResourceManager(Form1::typeid)); 
      this->button1 = (gcnew System::Windows::Forms::Button()); 
      this->axAcroPDF1 = (gcnew AxAcroPDFLib::AxAcroPDF()); 
      this->label1 = (gcnew System::Windows::Forms::Label()); 
      this->button2 = (gcnew System::Windows::Forms::Button()); 
      this->linkLabel1 = (gcnew System::Windows::Forms::LinkLabel()); 
      this->linkLabel2 = (gcnew System::Windows::Forms::LinkLabel()); 
      this->linkLabel3 = (gcnew System::Windows::Forms::LinkLabel()); 
      this->linkLabel4 = (gcnew System::Windows::Forms::LinkLabel()); 
      this->linkLabel5 = (gcnew System::Windows::Forms::LinkLabel()); 
      (cli::safe_cast<System::ComponentModel::ISupportInitialize^ >(this->axAcroPDF1))->BeginInit(); 
      this->SuspendLayout(); 
      // 
      // button1 
      // 
      this->button1->Location = System::Drawing::Point(909, 11); 
      this->button1->Name = L"button1"; 
      this->button1->Size = System::Drawing::Size(122, 37); 
      this->button1->TabIndex = 0; 
      this->button1->Text = L"Choose Files"; 
      this->button1->UseVisualStyleBackColor = true; 
      this->button1->Click += gcnew System::EventHandler(this, &Form1::button1_Click); 
      // 
      // axAcroPDF1 
      // 
      this->axAcroPDF1->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->axAcroPDF1->Enabled = true; 
      this->axAcroPDF1->Location = System::Drawing::Point(623, 55); 
      this->axAcroPDF1->Name = L"axAcroPDF1"; 
      this->axAcroPDF1->OcxState = (cli::safe_cast<System::Windows::Forms::AxHost::State^ >(resources->GetObject(L"axAcroPDF1.OcxState"))); 
      this->axAcroPDF1->Size = System::Drawing::Size(515, 580); 
      this->axAcroPDF1->TabIndex = 1; 
      // 
      // label1 
      // 
      this->label1->AutoSize = true; 
      this->label1->Location = System::Drawing::Point(16, 11); 
      this->label1->Name = L"label1"; 
      this->label1->Size = System::Drawing::Size(35, 13); 
      this->label1->TabIndex = 2; 
      this->label1->Text = L"label1"; 
      this->label1->Click += gcnew System::EventHandler(this, &Form1::label1_Click); 
      // 
      // button2 
      // 
      this->button2->Location = System::Drawing::Point(1037, 11); 
      this->button2->Name = L"button2"; 
      this->button2->Size = System::Drawing::Size(101, 37); 
      this->button2->TabIndex = 3; 
      this->button2->Text = L"Exit"; 
      this->button2->UseVisualStyleBackColor = true; 
      this->button2->Click += gcnew System::EventHandler(this, &Form1::button2_Click); 
      // 
      // linkLabel1 
      // 
      this->linkLabel1->AutoSize = true; 
      this->linkLabel1->Location = System::Drawing::Point(15, 300); 
      this->linkLabel1->Name = L"linkLabel1"; 
      this->linkLabel1->Size = System::Drawing::Size(13, 13); 
      this->linkLabel1->TabIndex = 4; 
      this->linkLabel1->TabStop = true; 
      this->linkLabel1->Text = L""; 
      this->linkLabel1->LinkClicked += gcnew System::Windows::Forms::LinkLabelLinkClickedEventHandler(this, &Form1::linkLabel1_LinkClicked); 
      // 
      // linkLabel2 
      // 
      this->linkLabel2->AutoSize = true; 
      this->linkLabel2->Location = System::Drawing::Point(15, 315); 
      this->linkLabel2->Name = L"linkLabel2"; 
      this->linkLabel2->Size = System::Drawing::Size(13, 13); 
      this->linkLabel2->TabIndex = 5; 
      this->linkLabel2->TabStop = true; 
      this->linkLabel2->Text = L""; 
      this->linkLabel2->LinkClicked += gcnew System::Windows::Forms::LinkLabelLinkClickedEventHandler(this, &Form1::linkLabel2_LinkClicked); 
      // 
      // linkLabel3 
      // 
      this->linkLabel3->AutoSize = true; 
      this->linkLabel3->Location = System::Drawing::Point(15, 330); 
      this->linkLabel3->Name = L"linkLabel3"; 
      this->linkLabel3->Size = System::Drawing::Size(13, 13); 
      this->linkLabel3->TabIndex = 6; 
      this->linkLabel3->TabStop = true; 
      this->linkLabel3->Text = L""; 
      this->linkLabel3->LinkClicked += gcnew System::Windows::Forms::LinkLabelLinkClickedEventHandler(this, &Form1::linkLabel3_LinkClicked); 
      // 
      // linkLabel4 
      // 
      this->linkLabel4->AutoSize = true; 
      this->linkLabel4->Location = System::Drawing::Point(15, 345); 
      this->linkLabel4->Name = L"linkLabel4"; 
      this->linkLabel4->Size = System::Drawing::Size(13, 13); 
      this->linkLabel4->TabIndex = 7; 
      this->linkLabel4->TabStop = true; 
      this->linkLabel4->Text = L""; 
      this->linkLabel4->LinkClicked += gcnew System::Windows::Forms::LinkLabelLinkClickedEventHandler(this, &Form1::linkLabel4_LinkClicked); 
      // 
      // linkLabel5 
      // 
      this->linkLabel5->AutoSize = true; 
      this->linkLabel5->Location = System::Drawing::Point(15, 360); 
      this->linkLabel5->Name = L"linkLabel5"; 
      this->linkLabel5->Size = System::Drawing::Size(13, 13); 
      this->linkLabel5->TabIndex = 8; 
      this->linkLabel5->TabStop = true; 
      this->linkLabel5->Text = L""; 
      this->linkLabel5->LinkClicked += gcnew System::Windows::Forms::LinkLabelLinkClickedEventHandler(this, &Form1::linkLabel5_LinkClicked); 
      // 
      // Form1 
      // 
      this->AutoScaleDimensions = System::Drawing::SizeF(6, 13); 
      this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font; 
      this->ClientSize = System::Drawing::Size(1150, 647); 
      this->Controls->Add(this->linkLabel5); 
      this->Controls->Add(this->linkLabel4); 
      this->Controls->Add(this->linkLabel3); 
      this->Controls->Add(this->linkLabel2); 
      this->Controls->Add(this->linkLabel1); 
      this->Controls->Add(this->button2); 
      this->Controls->Add(this->label1); 
      this->Controls->Add(this->axAcroPDF1); 
      this->Controls->Add(this->button1); 
      this->Name = L"Form1"; 
      this->Text = L"Form1"; 
      (cli::safe_cast<System::ComponentModel::ISupportInitialize^ >(this->axAcroPDF1))->EndInit(); 
      this->ResumeLayout(false); 
      this->PerformLayout(); 

     } 

#pragma endregion 
private: System::Void button1_Click(System::Object^ sender, System::EventArgs^ e) { 
       OpenFileDialog^ opendialog =gcnew OpenFileDialog; 
       opendialog-> ShowDialog(); 
       axAcroPDF1->src=opendialog->FileName; 

       String^ file_name=opendialog->FileName; 
       std::string stan_string ; 
       //std::string stan_string = marshal_as<string>(file_name); 
       MarshalString(opendialog->FileName->ToString(),stan_string); 
       //const __wchar_t __pin * stan_string = PtrToStringChars(file_name); 
       ofstream outfile; 
       outfile.open("Test.txt", ios::out | ios::app); 
       outfile<<stan_string<<endl; 
       outfile.close(); 

       int number_of_lines = 0; 
       string line,tempLine; 
       ifstream myfile("Test.txt"); 

       while (std::getline(myfile, line)) 
        ++number_of_lines; 
        myfile.close(); 
       ifstream my_file("Test.txt"); 
        for(int i=number_of_lines;i>0;i--) 
       { 
        std::getline(my_file,line); 
        history[i] = line; 

       } 
       my_file.close(); 
       ofstream out_file; 
       string fn="history.txt"; 
       out_file.open(fn.c_str()); 
       for(int i=1;i<=number_of_lines;i++) 
       { 
        out_file<<history[i]<<endl; 
       } 
       out_file.close(); 

       String^ ReadedFile=File::ReadAllText("history.txt"); 
       label1->Text = ReadedFile; 

       ifstream inFile; 
       ofstream oFile; 
       inFile.open("history.txt"); 
       oFile.open("names.txt"); 

       while (getline (inFile,line)){ 
       // cout << line << endl; 
       int pos = line.find_last_of("\\"); 

       if (string::npos != pos){ 
        tempLine = line.erase(0, pos + 1); 
       } 

       oFile << tempLine << endl; 

       } 

       inFile.close(); 
       oFile.close(); 
       no_of_clicks++; 
       ifstream in_file("names.txt"); 
        for(int i=0;i<number_of_lines;i++) 
       { 
        std::getline(in_file,line); 
        record[i] = line; 

       } 
       in_file.close(); 

       if (no_of_clicks>5){ 
        no_of_clicks=no_of_clicks-5; 

       } 
        History_Links(); 
} 
void MarshalString (String^s, string& os) { 
    using namespace Runtime::InteropServices; 
    System::IntPtr pointer = Marshal::StringToHGlobalAnsi(s); 
     char* charPointer = reinterpret_cast<char*>(pointer.ToPointer()); 
    std::string returnString(charPointer, s->Length); 
    Marshal::FreeHGlobal(pointer); 
    os = returnString; 

    } 

public: void History_Links() 
{ 
       string name0=record[0]; 
       string name1=record[1]; 
       string name2=record[2]; 
       string name3=record[3];    
       string name4=record[4]; 
       this->linkLabel1->Text=gcnew String(name0.c_str()); 
       this->linkLabel2->Text=gcnew String(name1.c_str()); 
       this->linkLabel3->Text=gcnew String(name2.c_str()); 
       this->linkLabel4->Text=gcnew String(name3.c_str()); 
       this->linkLabel5->Text=gcnew String(name4.c_str()); 


} 

int history_reader() 
{ 
    int number_of_lines = 0; 
      string line; 
      ifstream myfile("Test.txt"); 

      while (std::getline(myfile, line)) 
       ++number_of_lines; 
       myfile.close(); 
      ifstream my_file("Test.txt"); 
       for(int i=number_of_lines;i>0;i--) 
      { 
       std::getline(my_file,line); 
       history[i] = line; 
      } 
       my_file.close(); 
       return number_of_lines; 
} 


private: System::Void label1_Click(System::Object^ sender, System::EventArgs^ e) { 
       // Application::Exit(); 
} 

private: System::Void button2_Click(System::Object^ sender, System::EventArgs^ e) { 
      std::ofstream oftest; 
      oftest.open("Test.txt", std::ofstream::out | std::ofstream::trunc); 
      oftest.close(); 
      std::ofstream ofhistory; 
      ofhistory.open("history.txt", std::ofstream::out | std::ofstream::trunc); 
      ofhistory.close(); 
      std::ofstream ofnames; 
      ofnames.open("names.txt", std::ofstream::out | std::ofstream::trunc); 
      ofnames.close(); 
      Application::Exit(); 
} 
private: System::Void linkLabel1_LinkClicked(System::Object^ sender, System::Windows::Forms::LinkLabelLinkClickedEventArgs^ e) { 
      history_reader();  
      string str1=history[1]; 
      String^ str2 = gcnew String(str1.c_str()); 
      //axAcroPDF1->src=str2; 
      OpenFileDialog^ opendialog =gcnew OpenFileDialog; 
      opendialog->FileName=str2; 
      //opendialog-> ShowDialog(); 
      axAcroPDF1->src=opendialog->FileName; 
     } 
private: System::Void linkLabel2_LinkClicked(System::Object^ sender, System::Windows::Forms::LinkLabelLinkClickedEventArgs^ e) { 
      history_reader();  
      string str1=history[2]; 
      String^ str2 = gcnew String(str1.c_str()); 
      //axAcroPDF1->src=str2; 
      OpenFileDialog^ opendialog =gcnew OpenFileDialog; 
      opendialog->FileName=str2; 
      //opendialog-> ShowDialog(); 
      axAcroPDF1->src=opendialog->FileName; 
     } 
private: System::Void linkLabel3_LinkClicked(System::Object^ sender, System::Windows::Forms::LinkLabelLinkClickedEventArgs^ e) { 
      history_reader();  
      string str1=history[3]; 
      String^ str2 = gcnew String(str1.c_str()); 
      //axAcroPDF1->src=str2; 
      OpenFileDialog^ opendialog =gcnew OpenFileDialog; 
      opendialog->FileName=str2; 
      //opendialog-> ShowDialog(); 
      axAcroPDF1->src=opendialog->FileName; 
     } 
private: System::Void linkLabel4_LinkClicked(System::Object^ sender, System::Windows::Forms::LinkLabelLinkClickedEventArgs^ e) { 
      history_reader();  
      string str1=history[4]; 
      String^ str2 = gcnew String(str1.c_str()); 
      //axAcroPDF1->src=str2; 
      OpenFileDialog^ opendialog =gcnew OpenFileDialog; 
      opendialog->FileName=str2; 
      //opendialog-> ShowDialog(); 
      axAcroPDF1->src=opendialog->FileName; 
     } 
private: System::Void linkLabel5_LinkClicked(System::Object^ sender, System::Windows::Forms::LinkLabelLinkClickedEventArgs^ e) { 
      history_reader();  
      string str1=history[5]; 
      String^ str2 = gcnew String(str1.c_str()); 
      //axAcroPDF1->src=str2; 
      OpenFileDialog^ opendialog =gcnew OpenFileDialog; 
      opendialog->FileName=str2; 
      //opendialog-> ShowDialog(); 
      axAcroPDF1->src=opendialog->FileName; 
     } 
}; 
}