我想在Winform，C ++中动态创建一个linklabels / Buttons队列。当我单击一个按钮时，链接标签会动态显示为link1。如果我第二次点击按钮，link1应该在下面，link2应该出现在link1的顶部。点击按钮第三次link1应该下拉，link2应该取link1位置，link3应该取link2位置，依此类推。你可以看到它像一个队列。队列应该有五个项目，第六次单击按钮时，链接1应该消失，链接6应该在顶部。这种情况一直在继续。
我完成了一些任务。我已动态创建链接标签。我想在每次点击按钮时删除所有链接标签，并根据点击次数重新排序它们的位置来重新创建它们。但无法删除链接标签。我甚至试图在另一个链接标签上覆盖一个新的链接标签，但是如果我点击覆盖的链接标签，之前的链接标签就不会出现并显示一些异常错误。
答案 0 :(得分：0)
`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;
}
}`
答案 1 :(得分：0)
#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;
}
};
}