Hello , I am beginer in c++ as i started few days ago and i find it hard to understand most of syntax.
What i should use to make part of code do a calculation 1 time and after that not repeat actions?
What should i use to make part of code to repeat itself?
I am trying to make a widely customizable delay timer of 3sec out of QueryPerformanceFreqency and QueryPerformanceCounter by first calculating QueryPerformanceFreqency*3+QueryPerformanceCounter , then not repetaing it anymore and later it should start to compare results from QueryPerformanceFreqency*3+QueryPerformanceCounter to QueryPerformanceCounter. So if value becaomes bigger it would start to do delayed task.
program, it compiles under visual studio 2010 but i am not able to make a delay as i was hoping for because of too little understanding how to manipulate values in code.
idea is that by pressing checkbox1 it would make aaaaaaa appear with 3sec delay.
problem is in this part, i was hoping it to work as delay.Code:#pragma once
#include <iostream>
#include <windows.h> // for Windows APIs
namespace timerfinal {
using namespace System;
using namespace System::ComponentModel;
using namespace System::Collections;
using namespace System::Windows::Forms;
using namespace System::Data;
using namespace System::Drawing;
/// <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::CheckBox^ checkBox1;
private: System::Windows::Forms::Label^ label1;
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)
{
this->checkBox1 = (gcnew System::Windows::Forms::CheckBox());
this->label1 = (gcnew System::Windows::Forms::Label());
this->SuspendLayout();
//
// checkBox1
//
this->checkBox1->AutoSize = true;
this->checkBox1->Location = System::Drawing::Point(44, 12);
this->checkBox1->Name = L"checkBox1";
this->checkBox1->Size = System::Drawing::Size(80, 17);
this->checkBox1->TabIndex = 0;
this->checkBox1->Text = L"checkBox1";
this->checkBox1->UseVisualStyleBackColor = true;
this->checkBox1->CheckedChanged += gcnew System::EventHandler(this, &Form1::checkBox1_CheckedChanged);
//
// label1
//
this->label1->AutoSize = true;
this->label1->Location = System::Drawing::Point(41, 32);
this->label1->Name = L"label1";
this->label1->Size = System::Drawing::Size(35, 13);
this->label1->TabIndex = 1;
this->label1->Text = L"label1";
//
// Form1
//
this->AutoScaleDimensions = System::Drawing::SizeF(6, 13);
this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
this->ClientSize = System::Drawing::Size(158, 77);
this->Controls->Add(this->label1);
this->Controls->Add(this->checkBox1);
this->Name = L"Form1";
this->Text = L"Form1";
this->ResumeLayout(false);
this->PerformLayout();
}
#pragma endregion
private: System::Void checkBox1_CheckedChanged(System::Object^ sender, System::EventArgs^ e) {
{
LARGE_INTEGER freq; // ticks per second
LARGE_INTEGER time; //count+needed time
LARGE_INTEGER count; //all ticks
// get ticks per second
QueryPerformanceFrequency(&freq);
// count for ending
QueryPerformanceCounter(&count);
//ticks needed
time.QuadPart = (freq.QuadPart*3) + count.QuadPart;
while (count.QuadPart >= time.QuadPart){
label1->Text = "aaaaaaaaa";
}
}
}
};
}
as far as i am able to understrand
QueryPerformanceFrequency should mean how many numbers per sec
QueryPerformanceCounter should be how many numbers have passed
i am not sure how to make it compare (count.QuadPart >= time.QuadPart) so if value becomes equal or bigger it would do task.
time.QuadPart = (freq.QuadPart*3) + count.QuadPart;
this calculation may only be needed once , i am not sure but maybe this repeats itself with my current code.
Sleep() freezes all, tryed to understand others as well but too complicated to understand.
Code:
{
LARGE_INTEGER freq; // ticks per second
LARGE_INTEGER time; //count+needed time
LARGE_INTEGER count; //all ticks
// get ticks per second
QueryPerformanceFrequency(&freq);
// count for ending
QueryPerformanceCounter(&count);
//ticks needed
time.QuadPart = (freq.QuadPart*3) + count.QuadPart;
while (count.QuadPart >= time.QuadPart){
label1->Text = "aaaaaaaaa";
}
}
