QueryPerformanceFreqency and QueryPerformanceCounter

[1248]

hello , i try make a customizable delay out of QueryPerformanceFreqency and QueryPerformanceCounter i try is as i googled for 6+ hours and couldnot find anything to work with but i am not sure how to get it working.

Problem for me is that i have no idea how to use QueryPerformanceCounter so that value would be updating constantly not only 1 value and finished.
What sould i use in code to make values update itself very fast automatically?

for example id like QueryPerformanceCounter to update its value that is compared(<=) to calculation with fixed values. QueryPerformanceFreqency+QueryPerformanceCounter*2 to get a 2sec delay as soon as value is equal or larger than other and then
use if true to do delayed task.

How to make QueryPerformanceCounter update itself in comaprison to calculation that would be with fixed values?

[VictorN]

hello , i try make a customizable delay out of QueryPerformanceFreqency and QueryPerformanceCounter i try is as i googled for 6+ hours and couldnot find anything to work with but i am not sure how to get it working.

Problem for me is that i have no idea how to use QueryPerformanceCounter

Then why do you want to implement it?
And the fact that you "googled for 6+ hours" means nothing! Someone could find the solution after googling for a couple of minutes, another one doesn't find it during the weeks!
The main problem with "googling" is you have to know what you are looking for!

PS: BTW, what is wrong for you with Timers?

[1248]

If i know how to implement timers nothing is wrong.
If not then trying to make simple things work seems be very time consuming , il stick to tourials as it may teach more than watching google logo.

[VictorN]

Well, again: did you read about Timers and its using in MSDN (I gave you a link in my previous post)? There are some code examples so you could very easy and fast implement it.

As for "QueryPerformanceFreqency and QueryPerformanceCounter": I don't use them (because I just don't need to!), so cannot give you any example.

[1248]

yes i am trying to understand those, first i will need to undersatand terms then further.

[1248]

{
LARGE_INTEGER freq; // ticks per second
LARGE_INTEGER startcount; //ticks at beginning
LARGE_INTEGER count; //all ticks
__int64 Time;

// get ticks per second
QueryPerformanceFrequency(&freq);
// count at start
QueryPerformanceCounter(&startcount);
// count for ending
QueryPerformanceCounter(&count);
// needed time
Time = t2.QuadPart+freq.QuadPart*3 //ticks at beginning+1sec*3

while(count => Time){ //time reaches higher than ticks at beginning+1sec*3

label1->Text = "aaaaaaaaa";
}

what is wrong with this code?

following errors appear:
1>c:\users\--\documents\visual studio 2010\projects\timer\timer\Form1.h(114): error C2065: 't2' : undeclared identifier
1>c:\users\--\documents\visual studio 2010\projects\timer\timer\Form1.h(114): error C2228: left of '.QuadPart' must have class/struct/union
1> type is ''unknown-type''
1>c:\users\--\documents\visual studio 2010\projects\timer\timer\Form1.h(116): error C2143: syntax error : missing ';' before 'while'
1>c:\users\--\documents\visual studio 2010\projects\timer\timer\Form1.h(116): error C2059: syntax error : '>'
1>c:\users\--\documents\visual studio 2010\projects\timer\timer\Form1.h(116): error C2143: syntax error : missing ';' before '{'

[VictorN]

{
    LARGE_INTEGER freq;        // ticks per second
    LARGE_INTEGER startcount;      //ticks at beginning
    LARGE_INTEGER count;           //all ticks
    __int64 Time;

    // get ticks per second
    QueryPerformanceFrequency(&freq);
    // count at start
    QueryPerformanceCounter(&startcount);
    // count for ending
    QueryPerformanceCounter(&count);
    // needed time
    Time = t2.QuadPart+freq.QuadPart*3  //ticks at beginning+1sec*3

    while(count => Time){               //time reaches higher than ticks at beginning+1sec*3

    label1->Text = "aaaaaaaaa";
            }

what is wrong with this code?

following errors appear:
1>c:\users\--\documents\visual studio 2010\projects\timer\timer\Form1.h(114): error C2065: 't2' : undeclared identifier
1>c:\users\--\documents\visual studio 2010\projects\timer\timer\Form1.h(114): error C2228: left of '.QuadPart' must have class/struct/union
1> type is ''unknown-type''
1>c:\users\--\documents\visual studio 2010\projects\timer\timer\Form1.h(116): error C2143: syntax error : missing ';' before 'while'
1>c:\users\--\documents\visual studio 2010\projects\timer\timer\Form1.h(116): error C2059: syntax error : '>'
1>c:\users\--\documents\visual studio 2010\projects\timer\timer\Form1.h(116): error C2143: syntax error : missing ';' before '{'

1. Please, use Code tags! Otherwise your code is not readable!
2. The 't2' is not declared in the code snippet you have posted, So what do you expect?

[1248]

{
    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";
            }
}

Tryed to make it simple for myself and id like to ask few questions.
Do all numbers start to update constantly or only this line?
while (count.QuadPart > time.QuadPart)
if all then i am giving up to waste less time of others and self as i have too little understanding to learn to timers at microsoft page that is and thisone as well.
Is it possiblt to make it so that time.QuadPart = (freq.QuadPart * 3) + count.QuadPart; is calculated only 1 time?

[VictorN]

Tryed to make it simple for myself

So did you succeed?

Do all numbers start to update constantly or only this line?
while (count.QuadPart > time.QuadPart)

It doesn't make much sense to discuss non-compilable code without any requiered definitions and initializations.

[1248]

[QUOTE=VictorN;2064873]So did you succeed?
i belive code is now bit more simplified and it compiled and runs but if i toggle checkbox on user interface label 1 reamins label 1 not aaaaaaaaaa, i am hoping for aaaaaa to appear with delay.
i belive that it starts to calculate both values over and over or it only does it once and stops or does nothing at all.
What id like to learn is how to make 1 line repeat until it changes text to aaaaaaaa and other line calculate only once and use results for calculations on repeating line.

[VictorN]

I'm glad your code now compiles and runs...
However, we have no idea what your "user interface" is, nor know we anything about your checkbox, "aaaaaaaaaa" nad other labels.

[1248]

#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";
            }
}









			 }
	};
}

This compiles but i am not able to make a delay as i was hoping for because of too little understanding how to manipulate those numbers.
idea is taht by pressing checkbox1 it would make aaaaaaa appear with 3sec delay.

as far as i am able to understrand
QueryPerformanceFrequency should mean how many numbers per sec
QueryPerformanceCounter should be how many numbers have passed

Sleep() freezes all, tryed to understand others as well but too complicated to understand.

[VictorN]

The code you've just posted is not a native VC++ code. It looks more like a managed C++ which is discussed in another forum. (Managed C++ and C++/CLI Discuss Managed C++ and .NET-specific questions related to C++)

[MikeAThon]

Using QueryPerformanceCounter to insert a delay is a form of polling, and polling is evil.

Don't do it. And if you find examples based on GetTickCount or some other timer-style API, don't use them for the same reason.

Use timers, as suggested by VictorN.

[1248]

What form of polling means in programming?