VC++ .NET UI同步(使用Invoke托管方法),异步线程调用UI

花了好几天才学会,之前的代码都是C#的,无法直接使用.

1.首先定义并声明托管

delegate void testUI1(String ^ptr);//定义一个UI托管delegate void testUI2(String ^ptr);//定义一个UI托管testUI1^ myUI1;testUI2^ myUI2;

2.在构造函数中实例化托管对象

myUI1 = gcnew testUI1( this, &test::Form1::UI_Test1);myUI2 = gcnew testUI2( this, &test::Form1::UI_Test2);

3.托管中调用的函数(主要用于UI操作)

void UI_Test1(String ^ptr)  //这个是被线程调用的函数{label1->Text=ptr;}void UI_Test2(String ^ptr)  //这个是被线程调用的函数{label2->Text=ptr;}

4.在异步线程中使用托管访问UI

//线程1void TestThread(void){DWORD i=0;//防止在窗口句柄初始化之前就走到下面的代码while (!this->IsHandleCreated){Sleep(10);}//Sleep(1000);//一定要延时之后再建立线程,否则会出现//在创建窗口句柄之前,不能在控件上调用 Invoke 或 BeginInvoke//主要是因为UI界面还没有初始化完成,调用Invoke会出错while(1){this->Invoke(myUI1, ""+i);i ++;Sleep(1000);}}//线程2void TestThread1(void){DWORD i=1000;//防止在窗口句柄初始化之前就走到下面的代码while (!this->IsHandleCreated){Sleep(10);}//Sleep(2000);//一定要延时之后再建立线程,否则会出现//在创建窗口句柄之前,不能在控件上调用 Invoke 或 BeginInvoke//主要是因为UI界面还没有初始化完成,调用Invoke会出错while(1){this->Invoke(myUI2, ""+i);i ++;Sleep(1000);}}

运行效果

附上所有代码

#pragma once#include "stdafx.h"#include "windows.h"#pragma comment(lib, "advapi32.lib")#pragma comment(lib, "Ws2_32.lib")  #pragma comment(lib, "User32.lib") namespace test {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::Threading;/// <summary>/// Form1 摘要/// </summary>public ref class Form1 : public System::Windows::Forms::Form{System::Threading::Thread  ^Thread1;System::Threading::Thread  ^Thread2;delegate void testUI1(String ^ptr);//定义一个UI托管delegate void testUI2(String ^ptr);//定义一个UI托管testUI1^ myUI1;testUI2^ myUI2;public:Form1(void){InitializeComponent();myUI1 = gcnew testUI1( this, &test::Form1::UI_Test1);myUI2 = gcnew testUI2( this, &test::Form1::UI_Test2);this->Thread1 = gcnew Thread (gcnew ThreadStart (this,&test::Form1::TestThread));this->Thread1->Start();this->Thread1->IsBackground = TRUE;//将读取线程设置为后台线程,这样在UI线程关闭后可以自动退出this->Thread2 = gcnew Thread (gcnew ThreadStart (this,&test::Form1::TestThread1));this->Thread2->Start();this->Thread2->IsBackground = TRUE;//将读取线程设置为后台线程,这样在UI线程关闭后可以自动退出////TODO: 在此处添加构造函数代码//this->label1->Text="";this->label2->Text="";}void UI_Test1(String ^ptr)  //这个是被线程调用的函数{this->label1->Text=ptr;}void UI_Test2(String ^ptr)  //这个是被线程调用的函数{this->label2->Text=ptr;}//线程1void TestThread(void){DWORD i=0;//防止在窗口句柄初始化之前就走到下面的代码while (!this->IsHandleCreated){Sleep(10);}//Sleep(1000);//一定要延时之后再建立线程,否则会出现//在创建窗口句柄之前,不能在控件上调用 Invoke 或 BeginInvoke//主要是因为UI界面还没有初始化完成,调用Invoke会出错while(1){this->Invoke(myUI1, ""+i);i ++;Sleep(1000);}}//线程2void TestThread1(void){DWORD i=1000;//防止在窗口句柄初始化之前就走到下面的代码while (!this->IsHandleCreated){Sleep(10);}//Sleep(2000);//一定要延时之后再建立线程,否则会出现//在创建窗口句柄之前,不能在控件上调用 Invoke 或 BeginInvoke//主要是因为UI界面还没有初始化完成,调用Invoke会出错while(1){this->Invoke(myUI2, ""+i);i ++;Sleep(1000);}}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::Label^  label2;private: System::Windows::Forms::Button^  button1;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->button1 = (gcnew System::Windows::Forms::Button());this->SuspendLayout();// // label1// this->label1->AutoSize = true;this->label1->Font = (gcnew System::Drawing::Font(L"宋体", 20, System::Drawing::FontStyle::Regular, System::Drawing::GraphicsUnit::Point, static_cast<System::Byte>(134)));this->label1->ForeColor = System::Drawing::Color::FromArgb(static_cast<System::Int32>(static_cast<System::Byte>(0)), static_cast<System::Int32>(static_cast<System::Byte>(0)), static_cast<System::Int32>(static_cast<System::Byte>(192)));this->label1->Location = System::Drawing::Point(106, 64);this->label1->Name = L"label1";this->label1->Size = System::Drawing::Size(96, 27);this->label1->TabIndex = 0;this->label1->Text = L"label1";// // label2// this->label2->AutoSize = true;this->label2->Font = (gcnew System::Drawing::Font(L"宋体", 20, System::Drawing::FontStyle::Regular, System::Drawing::GraphicsUnit::Point, static_cast<System::Byte>(134)));this->label2->ForeColor = System::Drawing::Color::Red;this->label2->Location = System::Drawing::Point(109, 139);this->label2->Name = L"label2";this->label2->Size = System::Drawing::Size(96, 27);this->label2->TabIndex = 1;this->label2->Text = L"label2";// // button1// this->button1->Location = System::Drawing::Point(216, 226);this->button1->Name = L"button1";this->button1->Size = System::Drawing::Size(75, 23);this->button1->TabIndex = 2;this->button1->Text = L"button1";this->button1->UseVisualStyleBackColor = true;this->button1->Click += gcnew System::EventHandler(this, &Form1::button1_Click);// // Form1// this->AutoScaleDimensions = System::Drawing::SizeF(6, 12);this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;this->ClientSize = System::Drawing::Size(503, 288);this->Controls->Add(this->button1);this->Controls->Add(this->label2);this->Controls->Add(this->label1);this->Name = L"Form1";this->Text = L"Form1";this->Load += gcnew System::EventHandler(this, &Form1::Form1_Load);this->ResumeLayout(false);this->PerformLayout();}#pragma endregionprivate: System::Void Form1_Load(System::Object^  sender, System::EventArgs^  e) { }private: System::Void button1_Click(System::Object^  sender, System::EventArgs^  e) { this->label1->Text = "按下按钮"; this->label2->Text = "按下按钮"; }};}