What are the programming methods for delayed execution?

What are the programming methods of delay function

1. Call the API SetTimer() function of the system timer to implement delay, and you need to include the header file

2. To achieve delay by cyclically calling the clock() function to read the program running time, the header file needs to be included

3. By calling the Sleep() function, you need to include the header file

The delay accuracy that the above functions can achieve is about 10ms

void delay(double second)

{

LARGE_INTEGER litmp;

LONGLONG QPart1, QPart2;

double dfMinus, dfFreq, dfTim;

QueryPerformanceFrequency(&litmp);

dfFreq = (double)litmp.QuadPart; // Get the clock frequency of the counter

QueryPerformanceCounter(&litmp);

QPart1 = litmp.QuadPart; // Get the initial value

do

{

QueryPerformanceCounter(&litmp);

QPart2 = litmp.QuadPart; //Get the abort value

dfMinus = (double)(QPart2 - QPart1);

dfTim = dfMinus / dfFreq; // Get the corresponding time value in seconds

}

while(dfTim

}

How to postpone the execution of a function in HTML5

1.[self performSelector:@selector (function name) withObject:nil afterDelay:5.0f]

Condition: In the main thread of uiviewController

2.[NSTimerscheduledTimerWithTimeInterval:5.0f target:self selector:@selector (function name) userInfo:nil repeats:NO];

In the specific function, execute the code, and after the execution is completed, call the NSTimer invalidate method to destroy the timer

3.[NSThread sleepForTimeInterval:5.0f];

[Method to delay execution];

Conditions: Main thread or sub-thread can be used

How to delay the execution of specified commands in bat

First of all, bat delay refers to executing a command and delaying it for a period of time before proceeding with the next command. Under cmd or in batch processing, the following four methods are often used for time delay:

1. Use the ping command to delay.

Example 1:

@echo off

echo before delay: %time%

ping /n 3 127.0.0.1 >nul

echo after delay: %time%

pause

2. Use the for command to delay.

Example 2:

@echo off

echo before delay: %time%

for /l %%i in (1,1,5000) do echo %%i>nul

echo after delay: %time%

pause

3. Use vbs delay function, with millisecond accuracy and error within 1000 milliseconds.

Example 3:

@echo off

echo %time%

call :delay 5000

echo %time%

pause

exit

:delay

echo WScript.Sleep %1>delay.vbs

CScript //B delay.vbs

del delay.vbs

goto :eof

4. Only use batch processing commands to achieve any time delay, with an accuracy of 10 milliseconds and an error of 50 milliseconds. Only batch processing commands can be used to achieve delay operations.

Example 4:

@echo off

set /p delay=Please enter the number of milliseconds to be delayed:

set TotalTime=0

set NowTime=%time%

:: Reading starting time, the time format is: 13:01:05.95

echo program start time: %NowTime%

:delay_continue

set /a minute1=1%NowTime:~3,2%-100

:: Read the starting time in minutes

set /a second1=1%NowTime:~-5,2%%NowTime:~-2%0-100000

:: Convert the starting time seconds to milliseconds

set NowTime=%time%

set /a minute2=1%NowTime:~3,2%-100

:: Read the minutes of the current time

set /a second2=1%NowTime:~-5,2%%NowTime:~-2%0-100000

:: Convert the seconds of the current time to milliseconds

set /a TotalTime =(%minute2%-%minute1% 60)%`*60000 %second2%-%second1%

if %TotalTime% lss �lay% goto delay_continue

echo program end time: %time%

echo set delay time: �lay% milliseconds

echo actual delay time: %TotalTime% milliseconds

pause

I hope the above methods can help you solve the problem satisfactorily!

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