I need to use hotkeys like Ctrl + 9 + 8, or Ctrl + A + B.
Autohotkey documentation here says that combinations of three or more keys are not supported. However Alt + Ctrl + Shift + X modifier key combinations are supported, where X can be an alphanumeric character.
KeyWaiting is showed in the other answer, I'd like to show the other option, which is using #If and GetKeyState().
You create a context sensitive hotkey by setting whatever condition with the #If directive.
In your case you'd want to check if the first key(s) of your hotkey is/are held down.
And then you'd set the last keys as a hotkey.
#If, GetKeyState("Ctrl") ;start of context sensitive hotkeys
8 & 9::
MsgBox, % "Ctrl + 8 + 9 held down"
return
#If ;end of context sensitive hotkeys
;example of holding down even more keys
;is only going to work if your system can
;recognize this many keys at once
#If, GetKeyState("Ctrl") && GetKeyState("1") && GetKeyState("2") && GetKeyState("3") && GetKeyState("4") && GetKeyState("5")
6 & 7::
MsgBox, % "Ctrl + 1 + 2 + 3 + 4 + 5 + 6 + 7 held down"
return
#If
Whether or not I'd recommend this approach is another thing.
If your script is just about simple hotkeys or something like that, this is a very good approach.
But if your script is more complex than that, you might run into the problems #If can cause. More about that from the documentation.
Basically, just try it out and if you have problems, maybe consider another approach.
There are different workarounds to do this. The following script uses KeyWait to handle multiple keys. Script for handling the hotkey needs be placed inside the If-block.
;Script to handle multiple key combinations ;Press Ctrl first then 9 and 8 in correct order for this to work
^9::
KeyWait, 8, D T3
;KeyWait, 7 D T3 ;add if more combinations are required
if (ErrorLevel = 0)
{
MsgBox, [Ctrl + 98] key combination recognized ; script to handle the hotkey to be placed here
}
return
Here's a good way to do it. I use it for shortcuts to various sites:
f8::
Check := true
SetTimer, CheckOff, 2000 ; 2 seconds to type in second part of shortcut
return
CheckOff:
Check := false
SetTimer,, Off ; Make sure we turn back off the timer -- otherwise it'll keep calling CheckOff every 2 seconds...
return
:*:bug::
if Check {
WinActivate, ahk_exe chrome.exe
Sleep 50 ; give just a bit of time for Chrome to respond
Send ^t ; To you know -- open a new window :)
Send ^l ; this is the shortcut for focusing on the address bar
Sleep 500 ; give just a bit of time for Chrome to respond
SendInput http://www.google.com{Enter}
} else {
SendInput bug
}
return
:*:lll::
if Check {
WinActivate, ahk_exe chrome.exe
Sleep 50 ; give just a bit of time for Chrome to respond
Send ^t ; To you know -- open a new window :)
Send ^l ; this is the shortcut for focusing on the address bar
Sleep 500 ; give just a bit of time for Chrome to respond
SendInput https://media.giphy.com/media/xT9KVAJenhRS0JPHFK/giphy.gif{Enter}
} else {
SendInput lll
}
return
:*:case::
if Check {
WinActivate, ahk_exe chrome.exe
Sleep 50 ; give just a bit of time for Chrome to respond
Send ^t ; To you know -- open a new window :)
Send ^l ; this is the shortcut for focusing on the address bar
Sleep 500 ; give just a bit of time for Chrome to respond
SendInput http://www.bing.com{Enter}
} else {
SendInput case
}
return
Here is a example:
#Include longhotkey.ahk
new LongHotkey("~t&e&f","exe_textify","hhh")
exe_textify(str){
Run D:\xx_zd\Textify\Textify.exe
}
new LongHotkey("~c&p&z","runprogram_cpuz","hhh")
runprogram_cpuz(str){
Run W:\xx_zd\CPU-Z\cpuz.exe
}
By using the script from the link below,you can define your custom long hotkey easily.
Origin link of how to create more than three custom hotkey combinations
class LongHotkey
{
; ; ; ; ; ; ; ; ;
; Author: Helgef
; Date: 2016-10-22
; Instructions: https://autohotkey.com/boards/viewtopic.php?f=6&t=24145
;
; Class variables
static instanceArray:=Object() ; Holds references to all objects derived from this class.
static allHotkeys:=Object() ; Holds all registred hotkeys.
static doNothingFunc:=ObjBindMethod(LongHotkey,"doNothing") ; All hotkeys are bound to this function.
static globalContextFunc:="" ; Global context function, set via setGlobalContext()
static allSuspended:=0 ; Used for pseudo-suspending all hotkeys.
static PriorLhk:="" ; Stores the long hotkey that was completed prior to the most recent completed lhk.
static mostRecentLhk:="" ; Stores the most recent lhk.
static TimeOfPriorLongHotkey:="" ; Stores the A_TickCount for the PriorLongHotkey.
static TimeOfMostRecentLongHotkey:="" ; Stores the A_TickCount for the most recently completed LongHotkey.
static hasFirstUps:=0 ; Keeps track of whether any lhk has specified FirstUp option.
static LatestFirstUp:="" ; For the first up option.
; Instance variables
hits:=0 ; Tracks the progress of the long hotkey.
contextFunc:="" ; Specified through setContext() method, to make the long hotkey context sensitive.
suspended:=0 ; Set by suspend() method, for pseudo-suspending hotkey.
FirstUpAllowed:=1 ; Used when enableFirstUp(true) has been called, to determine if upFunc should be called.
upFunc:="" ; See comment on FirstUpAllowed.
TimeOfThisLongHotkey:="" ; Stores the time of the last completion for this lhk.
;
; Callable instance methods
;
setContext(function:="",params*)
{
; Provide a function with an optional number of parameters to act as context function.
; This function should return true if the hotkey should be considered as in context, else false.
; Call setContext() without passing any parameters to remove context.
if IsFunc(function)
this.contextFunc:=Func(function).Bind(params*)
else if (function="")
this.contextFunc:=""
return
}
suspend(bool:=1)
{
; Pseudo-supend this hotkey. The registred hotkeys will remain, but the evaluation will terminate quick and no triggering is possible.
; Call with bool:=1 or do not pass a parameter at all, to invoke suspension.
; Call with bool:=0 to cancel suspension.
; Call with bool:=-1 to toggle suspension.
; Returns the current suspension state, ie., 1 for being suspended, 0 for not suspended.
return this.suspended:=bool=-1?!this.suspended:bool
}
setFunction(function,params*)
{
; Specify the name of the function that will be called when the long hotkey is completed, along with any number of parameters.
; Can be a label.
; If 'function' is not a function nor label, it is considered to be a string to send, it will be passed to LongHotkey.send()
; By default a reference to this hotkey is pushed into the params* array.
if RegExMatch(function,"#$") ; Mark the function name with an # (at) at the end to omit the reference to this instance in the params* array. Eg, "myFunc#"
function:=SubStr(function,1,-1)
else
params.push(this)
if IsFunc(function)
this.function:=Func(function).Bind(params*) ; Function to call when sequence is completed, with params.
else if IsLabel(function)
this.function:=function ; Label to call when sequence is completed.
else if (function!="")
this.function:=ObjBindMethod(LongHotkey,"Send",function) ; The parameter 'function' was not function nor label, send it as string instead.
else
this.function:=""
}
enableFirstUp(enable:=1)
{
; Enable the first key in the long hotkey to trigger its normal press event on its release, in the case when no other keys in the long hotkey was pressed.
; Call this function with parameter 0 to disable this behaviour.
if enable
{
LongHotkey.hasFirstUps:=this.upFunc?LongHotkey.hasFirstUps:++LongHotkey.hasFirstUps ; Only increment hasFirstUps counter if upFunc doesn't exist.
_downKey:=RegExReplace(this.keyList[1].down,"(?:\*|)(\w+)","{$1}") ; Encloses key name in "{ }"
this.upFunc:=ObjBindMethod(LongHotkey,"SendFirstUp",_downKey)
}
else if (this.UpFunc!="") ; This check is to avoid decrement LongHotkey.hasFirstUps unless it has an upFunc
{
this.upFunc:=""
LongHotkey.hasFirstUps--
}
return
}
ThisLongHotkey()
{
; Similar to A_ThisHotkey.
; Call this method on the reference passed to the success function, to get back the string that defined the hotkey.
; Eg, A_ThisLongHotkey:=lh.ThisLongHotkey(), where lh is the last parameter of the success function, eg, f(x1,...,xn,lh)
return this.keys
}
TimeSinceThisLongHotkey()
{
; Similar to A_TimeSinceThisHotkey.
; Returns the time (in ms) since this lhk was triggered.
; If the long hotkey has never been triggered, this method returns -1.
return this.TimeOfThisLongHotkey?A_TickCount-this.TimeOfThisLongHotkey:-1
}
getKeyList()
{
; Similar to the ThisLongHotkey() method, but here an array is returned. Note that modifers doesn't get their own spots in the array, eg,
; keys:="^ & a & b ! & c" transforms to keyList:=[^a, ^b, ^!c]
; This description is not correct any more < - - NOTE
return this.keyList
}
unregister()
{
; Unregister this long hotkey. To free the object, do lh:="" afterwards, if you wish. Here, lh is an instance of the class LongHotkey.
; To reregister, use reregister() method (not if lh:="" was done, obviously).
_clonedList:=this.keyList.clone()
LongHotkey.instanceArray.delete(this.instanceNumber)
Hotkey, If, LongHotkey.Press()
For _k, _key in _clonedList ; For each key(.down) in this long hotkey, check if it is registred in any of the other hotkeys, if it is, do not unregister it, else, do.
{
_deleteThis:=1
For _l, _lh in LongHotkey.instanceArray ; Search for the key in another long hotkey, if it is found, do not delete it.
{
For _m, _dndKey in _lh.keyList
{
if (_key.down=_dndKey.down)
{
_deleteThis:=0 ; do not delete key.
break,2
}
}
}
if _deleteThis
{
Hotkey, % _key.down, Off ; Turn off the hotkey, and remove it from the allHotkeys list.
LongHotkey.allHotkeys.delete(_key.down)
}
}
this.keyList:=_clonedList ; The clone lives.
this.registred:=0 ; This long hotkey is not registred any more.
Hotkey, If
return
}
reregister()
{
; Reregister a long hotkey, return 1 on success, 0 otherwise.
if this.registred
return 0
For _k, _key in this.keyList ; If we get here, this is the clone.
LongHotkey.RegisterHotkey(_key.down)
this.instanceNumber:=LongHotkey.instanceArray.push(this)
this.registred:=1
return 1
}
;
; Callable class methods
;
suspendAll(bool:=1)
{
; Pseudo-supend all long hotkeys.
; The registred hotkeys will remain, but the evaluation will terminate quick and no triggering is possible.
; To truly suspend, use the built in Supend command.
; Call with bool:=1 or do not pass a parameter at all, to invoke suspension.
; Call with bool:=0 to cancel suspension.
; Call with bool:=-1 to toggle suspension.
; Returns the current suspension state, ie., 1 for all is suspended, 0 for not suspended
return LongHotkey.allSuspended:=bool=-1?!LongHotkey.allSuspended:bool
}
setGlobalContext(function:="",params*)
{
; Provide a function with an optional number of parameters to act as global context function.
; If this function is set and returns 0 no hotkey is active.
; This function should return true if the hotkey should be considered as in context, else false.
; Call with setGlobalContext() without any parameters to remove context.
if IsFunc(function)
LongHotkey.globalContextFunc:=Func(function).Bind(params*)
else if (function="")
LongHotkey.globalContextFunc:=""
return
}
unregisterAll(onOff:="Off")
{
; Unregisters all hotkeys.
; Do not pass a parameter
Hotkey, If, LongHotkey.Press()
For _key in LongHotkey.allHotkeys
Hotkey, % _key, % onOff
Hotkey, If,
return
}
reregisterAll()
{
; Reregisters all hotkeys.
return LongHotkey.unregisterAll("On")
}
MostRecentLongHotkey(ref:=0)
{
; This is returns the most recently completed long hotkey.
; Call with ref:=0 or without any parameter, to get the key string that defined the hotkey that triggered most recently, eg,
; "a & b & c".
; Call with ref:=1 to recieve a reference to the most recent long hotkey instead.
return !ref?LongHotkey.MostRecentLhk.keys:LongHotkey.MostRecentLhk
}
TimeSinceMostRecentLongHotkey()
{
; Returns the time since (in ms.) the the most recently lhk was triggered.
; If no long hotkey has been triggered, this method returns -1.
return LongHotkey.TimeOfMostRecentLongHotkey?A_TickCount-LongHotkey.TimeOfMostRecentLongHotkey:-1
}
PriorLongHotkey(ref:=0)
{
; Similar to A_PriorHotkey.
; Call with ref:=0 or without any parameter, to get the key string that defined the hotkey that triggered prior to the most recent one, eg,
; "a & b & c".
; Call with ref:=1 to recieve a reference to the prior long hotkey instead.
; returns blank if no PriorLongHotkey exists.
return !ref?LongHotkey.Priorlhk.keys:LongHotkey.Priorlhk
}
TimeSincePriorLongHotkey()
{
; Similar to A_TimeSincePriorHotkey
; Returns the time since (in ms.) the prior lhk was last triggered. That is, time since the lhk prior to the most recent one was triggered.
; If there is no prior long hotkey, this method returns -1.
return LongHotkey.TimeOfPriorLongHotkey?A_TickCount-LongHotkey.TimeOfPriorLongHotkey:-1
}
;
; End callable methods.
;
__New(keys,function,params*)
{
this.instanceNumber:=LongHotkey.instanceArray.Push(this)
this.length:=this.processKeys(keys) ; Creates a "keyList" for this instance, and returns the appropriate length.
this.registred:=1 ; Indicates that the hotkeys are registred.
this.keys:=keys
this.setFunction(function,params*)
}
processKeys(str)
{
; Pre-process routine, runs once per new long hotkey.
; Converts the key string (str) to an array, keyList[n]:={down:modifier key_n, up: "*key_n up", tilde:true/false}
; Eg, "^ & ~a & b & ! & c" -> keyList[1]:={down: "^a", up: "*a up", tilde: 1}
; keyList[2]:={down: "^b", up: "*b up", tilde: 0}
; keyList[3]:={down: "^!c", up: "*c up", tilde: 0}
; Also makes a slightly redunant array: keyUpList[keyList[n].up]:=n. It is used in the Release() function, to quickly determine which part of the hotkey sequnce was released.
;
this.keyList:=Object()
this.keyUpList:=Object()
_modifiers:=""
; Adjust key string (str) to fit pre-process routine
str:=RegExReplace(str,"\s","") ; Remove spaces.
; Transfrom modifiers given by name to symbol styled modifier, eg, "LCtrl" --> "<^"
_ModifierList := { LControl:"<^",LCtrl:"<^",RControl:">^",RCtrl:">^",Ctrl:"^",Control:"^"
,LAlt:"<!",RAlt:">!",Alt:"!"
,LShift:"<+",RShift:">+",Shift:"+"
,LWin:"<#",RWin:">#",Win:"#" ; "Win" is not a supported key, but it works here.
,AltGr:"<^>!"}
; prepend #0 to last key if it is a modifier. Cheap way to make modifiers work as last key. This is an after-constructionm, due to some oversight.
if _ModifierList.HasKey(RegExReplace(str,".*&(.*)","$1"))
str:=RegExReplace(str,"(.*&)","$1#0")
For _name, _symbol in _ModifierList
str:=RegExReplace(str,"i)\b" _name "\b", _symbol) ; Swap names for symbols.
; Parse 1, tilde ~
_ctr:=0 ; For correct indexing of tilde ~.
Loop, Parse, str,&
{
if RegExMatch(A_LoopField,"[\^!#+]+")
continue
_ctr++
this.keyList[_ctr]:={} ; Create an empty "sub-object" at index _ctr, this will have three key-value pairs: down,up,tilde.
if RegExMatch(A_LoopField,"~")
this.keyList[_ctr].tilde:=1 ; If key has tilde, 0 should be returned from Press(), then the key is not suppressed.
else
this.keyList[_ctr].tilde:=0 ; Keys without tilde, should be suppressed.
}
str:=RegExReplace(str,"~","") ; Remove all ~
; Parse 2, set up key list and register hotkeys.
_ctr:=0 ; For correct indexing.
Loop, Parse, str,&
{
if RegExMatch(A_LoopField,"[\^!#+]+") && !InStr(A_LoopField, "#0") ; Check if modifers. #0 is to allow last key as modifier.
{
_modifiers:=LongHotkey.sortModifiers(_modifiers A_LoopField)
continue
}
_ctr++
_key:=RegExReplace(A_LoopField,"#0") ; This is a cheap way to make modifiers work as last key
LongHotkey.RegisterHotkey(_modifiers _key) ; Register this hotkey, i.e, modifier+key.
this.keyList[_ctr].down:=_modifiers _key ; Down events will trigger Press()
this.keyList[_ctr].up:=(InStr(_key,"*")?"":"*") _key " up" ; Using this format for the up event is due to that there seemed to be problems with modifiers. That is good english.
; Test
this.keyUpList[this.keyList[_ctr].up]:=_ctr ; This is slightly redundant, but it should improve performance.
LongHotkey.allHotkeys[_modifiers _key]:="" ; This is used for un/re-registerAll().
}
return _ctr ; Return the length of the sequence.
}
sortModifiers(unsorted)
{
; Helper function for process keys. Sorts modifiers, to aviod, eg, ^!b and !^b, this enables user to instanciate
; long hotkeys like, "ctrl & a & alt & b" and "alt & a & ctrl & b", simultaneously.
_ModifierList := [{"<^>!":4},{"<^":2},{">^":2},{"<!":2},{">!":2},{"<+":2}
,{">+":2},{"<#":2},{">#":2},{"+":1},{"^":1},{"!":1},{"#":1}]
_sorted:=""
For _k, _mod in _ModifierList ; This is 13 iterations.
For _symbol, _len in _mod ; This loop is one iteration.
if (_p:=InStr(unsorted,_symbol))
_sorted.=SubStr(unsorted,_p,_len), unsorted:=StrReplace(unsorted,_symbol,"")
return _sorted
}
;;
;; Hotkey evaluation methods.
;;
Press()
{
Critical,On
if (LongHotkey.allSuspended || (LongHotkey.LatestFirstUp!="" && ((LongHotkey.LatestFirstUp:="") || 1))) ; If pseudo-suspended, return 0 immediately, or if first up is needed to be suppressed.
return 0
if (LongHotkey.globalContextFunc!="" && !LongHotkey.globalContextFunc.Call()) ; Global context check
return 0
_upEventRegistred:=0 ; To aviod registring the up event more than once
_oneHit:=0, _tilde:=0 ; These values will togheter determine if the output should be suppressed or not, it is an unfortunate solution, w.r.t. maintainabillity. Hopefully it works and need not be changed.
_priority:=0, _dp:=0 ; In case a lot of hotkeys are triggered at the same time, or any other reason, one can set dp:=1 to make sure the timers for the success functions is set with decreaseing priority, hence they will not interupt eachother, but execute in the order their settimer is created. If you want the timers not to be interupted by other timers and such, set priority to a high enough value.
For _k, _lh in LongHotkey.instanceArray
{
if (_lh.hits=0 && (_lh.suspended || (_lh.contextFunc!="" && !_lh.contextFunc.Call()))) ; Check if suspended, and check context only when first key is pressed.
continue
if (_lh.hits>0 && _lh.keyList[_lh.hits].down=A_ThisHotkey) ; Key is same as last, suppress and continue.
{
_oneHit:=1
_tilde+=_lh.keyList[_lh.hits].tilde
continue
}
if (_lh.keyList[_lh.hits+1].down=A_ThisHotkey) ; Check if advanced.
{
_oneHit:=1
_lh.hits+=1 ; Update hit count.
_tilde+=_lh.keyList[_lh.hits].tilde
if (_lh.hits=_lh.length) ; Hotkey completed.
{
_timerFunction:=_lh.function ; Set up function call.
SetTimer, % _timerFunction,-1,% _priority - _dp ; priority and dp is explaind a few lines up.
_lh.hits-=1 ; Decrement the hit count to enable auto-repeat of the hotkey-
_lh.FirstUpAllowed:=0 ; No "first up" if hotkey completed.
; Manage TimeSince, and PriorLongHotkey stuff.
_lh.TimeOfThisLongHotkey:=A_TickCount
LongHotkey.PriorLhk:=LongHotkey.mostRecentLhk ; Manage prior long hotkey.
LongHotkey.mostRecentLhk:=_lh
LongHotkey.TimeOfPriorLongHotkey:=LongHotkey.TimeOfMostRecentLongHotkey ; Time stamps.
LongHotkey.TimeOfMostRecentLongHotkey:=A_TickCount
continue ; No need to bind up-event for last key.
}
if !_upEventRegistred
{
_doNothingFunc:=LongHotkey.doNothingFunc ; Hotkey has advanced, but not compeleted.
Hotkey, If, LongHotkey.Release() ; Bind up-event.
Hotkey, % _lh.keyList[_lh.hits].up, % _doNothingFunc, On
Hotkey, If,
_upEventRegistred:=1
}
}
}
return _oneHit*(_tilde=0) ; If there is no hit, no suppress, if there is a tilde but no hotkey advanced/completed, no suppress.
}
Release()
{
; Every time a key is released, all long hotkeys are set to zero hits.
Critical, On
Hotkey, If, LongHotkey.Release() ; Unbind this up-event.
Hotkey, % A_ThisHotkey, Off
Hotkey, If
; Determine if this up event should reset or decrease the hit count for any long hotkey. Also, manages the "first_up" option
_oneTimerSet:=0 ; For first up option
if LongHotkey.hasFirstUps ; Do this check to avoid calling noMultiHits() unless necessary.
_noMultiHits:=LongHotkey.noMultiHits() ; For first up option
For _k, _lh in LongHotkey.instanceArray
{
if (_lh.hits=0)
continue
if (_noMultiHits && !_oneTimerSet && _lh.upFunc!="" && _lh.hits=1 && _lh.FirstUpAllowed && _lh.keyList[1].up=A_ThisHotkey)
{
_timerFunction:=_lh.upFunc
SetTimer,% _timerFunction,-1
_oneTimerSet:=1 ; Only send one time, in case more than one hotkey has this as first key.
LongHotkey.LatestFirstUp:=_lh.keyList[1].down ; This is needed to disable Press() when the first up is triggered.
}
; Determine new hit count for this long hotkey.
_n:=_lh.keyUpList[A_ThisHotkey]
if (_n!="" && _n<=_lh.hits)
_lh.hits:=_n-1
_lh.FirstUpAllowed:=_lh.hits?_lh.FirstUpAllowed:1
}
return 0
}
noMultiHits()
{
; Helper function for FirstUp option, called from Release()
For _k, _lh in LongHotkey.instanceArray
if !_lh.FirstUpAllowed
return 0
return 1
}
RegisterHotkey(key)
{
; Register key to function doNothing(), under context LongHotkey.Press()
_doNothingFunc:=LongHotkey.doNothingFunc
Hotkey, If, LongHotkey.Press()
if !LongHotkey.allHotkeys.HasKey(key) ; Make sure key not already registred.
{
Hotkey,% key,% _doNothingFunc, On
LongHotkey.allHotkeys[key]:=""
}
Hotkey, If
return
}
doNothing(){
return ; All hotkeys are bound to this, serves two purposes:
} ; 1. The hotkey command require a function/label, 2. calling this function will suppress the "usual" output of the hotkey, when needed.
SendFirstUp(key)
{
; Function to send first key in case enableFirstUp(1) has been called
SendLevel,1 ; If there is problems with the first up function, try to increase/remove this.
Send, % key
return
}
Send(str)
{
; Mostly for testing, but works if wanted.
SendInput, % str
return
}
; For the hotkey command.
#If LongHotkey.Press()
#If LongHotkey.Release()
#If
}
I'm trying to allow users to simply hit Enter without typing anything, and use this to mean accepting a default value. scanf isn't doing what I want and the app still 'blocks': the next line of code doesn't run.
The only way is to actually type something THEN press Enter.
I tried using NSFileHandle and fileHandleWithStandardInput; however, it seems that the user is now forced to hit Ctrl-D to indicate EOF.
Someone suggested using fgets, but I cannot work out what to pass as 3rd parameter (of FILE* type). Tried stdin but it doesn't 'block'.
How do I accept input from a user, using Objective-C, and at the same time allow the user to simply hit Enter without being forced to type anything? How do I read a single line, even if that line is blank?
Assuming the code doesn't block and the next line runs immediately (as you seemed to indicate early in the question and in a comment), you have a common problem when mixing non-line-based and line-based input.
What happens is you have a newline left in the buffer, and fgets sees that, reads it, and returns, instead of doing what you really want: ignoring it, and then reading a line.
The solution is to simply do the ignoring part yourself, and then call fgets:
#include <stdio.h>
#include <string.h>
FILE* ignoreline(FILE* stream) {
for (int c; (c = fgetc(stream)) != EOF;) {
if (c == '\n') break;
}
return stream;
}
void example_use() {
char buf[1000];
ignoreline(stdin);
fgets(buf, sizeof buf, stdin);
// or, since it returns the stream, can be more compact:
fgets(buf, sizeof buf, ignoreline(stdin));
}
int main() { // error handling omitted
int n;
printf("Enter a number: ");
scanf("%d", &n);
char buf[1000];
printf("Enter a line: ");
ignoreline(stdin); // comment this line and compare the difference
fgets(buf, sizeof buf, stdin);
*strchr(buf, '\n') = '\0';
printf("You entered '%s'.\n", buf);
return 0;
}
Note that it is also common and encouraged to "pair" the ignoreline with the scanf (or other non-line-based input) to turn that into line-based input. You may want to modify it, in that case, so you can tell the difference between input of "42 abc" and "42" (in the "Enter a number" case). Some people just use fgets everywhere, then parse that line with sscanf, and while that works, it's not necessary.
I use getch(); in library conio.h
simply the program waits for any key to be pressed
If you're using Windows, you can use the ReadConsoleInput function (see MSDN for more on this) :
INPUT_RECORD keyin;
DWORD r;
while (ReadConsoleInput(GetStdHandle(STD_INPUT_HANDLE),&keyin,1,&r)) {
if (keyin.EventType!=KEY_EVENT) continue;
if (keyin.Event.KeyEvent.wVirtualKeyCode==VK_SPACE) break; ///use these VK codes to get any key's input
if (keyin.Event.KeyEvent.wVirtualKeyCode==VK_F1)
{
printf("You pressed F1\n");
}
if (keyin.Event.KeyEvent.wVirtualKeyCode==VK_F2)
{
printf("You pressed F2\n",);
}
}//end while loop
You don't need to hit enter after each key then.This works like a dream for me...
use getchar() to take input without using scanf function...