getch returns 2 characters when I type one
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When I use getch, it always appends the caracter read with a null character.
When I use the following code:
#include "stdafx.h"
#include <conio.h>
int main()
{
char c = 0;
while (c != 'x')
{
c = _getch();
printf("Char read: <%c> n", c);
}
}
It returns the follwing on the console, when I press the keys "asdx":
Char read: <a>
Char read: < >
Char read: <s>
Char read: < >
Char read: <d>
Char read: < >
Char read: <x>
This is compiled in VS 2017 in a plain new single file project, running on a windows 10 console window. I tried removing the _UNICODE and UNICODE define.
c++ visual-studio-2017 console-application
asked Aug 10 '18 at 18:40
Vincent HubertVincent Hubert
1,161819
|
show 3 more comments
When I use getch, it always appends the caracter read with a null character.
When I use the following code:
#include "stdafx.h"
#include <conio.h>
int main()
{
char c = 0;
while (c != 'x')
{
c = _getch();
printf("Char read: <%c> n", c);
}
}
It returns the follwing on the console, when I press the keys "asdx":
Char read: <a>
Char read: < >
Char read: <s>
Char read: < >
Char read: <d>
Char read: < >
Char read: <x>
This is compiled in VS 2017 in a plain new single file project, running on a windows 10 console window. I tried removing the _UNICODE and UNICODE define.
c++ visual-studio-2017 console-application
asked Aug 10 '18 at 18:40
Vincent HubertVincent Hubert
1,161819
How do you know it's a null character? BTW_getch()returnsint.
– n.m.
Aug 10 '18 at 18:48
2
works as expected for me, have you tried printing the numerical value of c to see what it is?
– Alan Birtles
Aug 10 '18 at 18:48
I know it's a null because I traced it into the debugger. I tried with either int or char, I got the same result.
– Vincent Hubert
Aug 10 '18 at 18:52
1
This is apparently a problem in some versions of Windows SDK, see developercommunity.visualstudio.com/content/problem/247770/…
– n.m.
Aug 10 '18 at 18:55
1
@AlanBirtles: it works for me in Debug mode but fails in Release mode. Same behavior as OP.
– Thomas Weller
Aug 10 '18 at 18:55
|
show 3 more comments
When I use getch, it always appends the caracter read with a null character.
When I use the following code:
#include "stdafx.h"
#include <conio.h>
int main()
{
char c = 0;
while (c != 'x')
{
c = _getch();
printf("Char read: <%c> n", c);
}
}
It returns the follwing on the console, when I press the keys "asdx":
Char read: <a>
Char read: < >
Char read: <s>
Char read: < >
Char read: <d>
Char read: < >
Char read: <x>
This is compiled in VS 2017 in a plain new single file project, running on a windows 10 console window. I tried removing the _UNICODE and UNICODE define.
c++ visual-studio-2017 console-application
asked Aug 10 '18 at 18:40
Vincent HubertVincent Hubert
1,161819
When I use getch, it always appends the caracter read with a null character.
When I use the following code:
#include "stdafx.h"
#include <conio.h>
int main()
{
char c = 0;
while (c != 'x')
{
c = _getch();
printf("Char read: <%c> n", c);
}
}
It returns the follwing on the console, when I press the keys "asdx":
Char read: <a>
Char read: < >
Char read: <s>
Char read: < >
Char read: <d>
Char read: < >
Char read: <x>
This is compiled in VS 2017 in a plain new single file project, running on a windows 10 console window. I tried removing the _UNICODE and UNICODE define.
c++ visual-studio-2017 console-application
c++ visual-studio-2017 console-application
asked Aug 10 '18 at 18:40
Vincent HubertVincent Hubert
1,161819
asked Aug 10 '18 at 18:40
Vincent HubertVincent Hubert
1,161819
asked Aug 10 '18 at 18:40
Vincent HubertVincent Hubert
1,161819
asked Aug 10 '18 at 18:40
Vincent HubertVincent Hubert
1,161819
asked Aug 10 '18 at 18:40
Vincent HubertVincent Hubert
1,161819
1,161819
How do you know it's a null character? BTW_getch()returnsint.
– n.m.
Aug 10 '18 at 18:48
2
works as expected for me, have you tried printing the numerical value of c to see what it is?
– Alan Birtles
Aug 10 '18 at 18:48
I know it's a null because I traced it into the debugger. I tried with either int or char, I got the same result.
– Vincent Hubert
Aug 10 '18 at 18:52
1
This is apparently a problem in some versions of Windows SDK, see developercommunity.visualstudio.com/content/problem/247770/…
– n.m.
Aug 10 '18 at 18:55
1
@AlanBirtles: it works for me in Debug mode but fails in Release mode. Same behavior as OP.
– Thomas Weller
Aug 10 '18 at 18:55
|
show 3 more comments
How do you know it's a null character? BTW_getch()returnsint.
– n.m.
Aug 10 '18 at 18:48
2
works as expected for me, have you tried printing the numerical value of c to see what it is?
– Alan Birtles
Aug 10 '18 at 18:48
I know it's a null because I traced it into the debugger. I tried with either int or char, I got the same result.
– Vincent Hubert
Aug 10 '18 at 18:52
1
This is apparently a problem in some versions of Windows SDK, see developercommunity.visualstudio.com/content/problem/247770/…
– n.m.
Aug 10 '18 at 18:55
1
@AlanBirtles: it works for me in Debug mode but fails in Release mode. Same behavior as OP.
– Thomas Weller
Aug 10 '18 at 18:55
How do you know it's a null character? BTW
_getch() returns int.– n.m.
Aug 10 '18 at 18:48
How do you know it's a null character? BTW
_getch() returns int.– n.m.
Aug 10 '18 at 18:48
2
2
works as expected for me, have you tried printing the numerical value of c to see what it is?
– Alan Birtles
Aug 10 '18 at 18:48
works as expected for me, have you tried printing the numerical value of c to see what it is?
– Alan Birtles
Aug 10 '18 at 18:48
I know it's a null because I traced it into the debugger. I tried with either int or char, I got the same result.
– Vincent Hubert
Aug 10 '18 at 18:52
I know it's a null because I traced it into the debugger. I tried with either int or char, I got the same result.
– Vincent Hubert
Aug 10 '18 at 18:52
1
1
This is apparently a problem in some versions of Windows SDK, see developercommunity.visualstudio.com/content/problem/247770/…
– n.m.
Aug 10 '18 at 18:55
This is apparently a problem in some versions of Windows SDK, see developercommunity.visualstudio.com/content/problem/247770/…
– n.m.
Aug 10 '18 at 18:55
1
1
@AlanBirtles: it works for me in Debug mode but fails in Release mode. Same behavior as OP.
– Thomas Weller
Aug 10 '18 at 18:55
@AlanBirtles: it works for me in Debug mode but fails in Release mode. Same behavior as OP.
– Thomas Weller
Aug 10 '18 at 18:55
|
show 3 more comments
2 Answers
2
active
oldest
votes
Well, crap!
It's a (rather new) bug in windows.
https://developercommunity.visualstudio.com/content/problem/247770/-getch-broken-in-vs-157.html
"When building a console application using the _getch() function
suddenly returns two times for each keypress"
got the following response from microsoft:
" Thanks for reporting this! This will be fixed on a future windows
update."
UPDATE:
As stated in the link above, setting the runtime to statically link with a previous version of the C runtime will fix the issue, but you need to make sure all your related projects (if you are building a library, for example) also use the same runtime. (I tested it)
answered Aug 10 '18 at 18:56
Vincent HubertVincent Hubert
1,161819
add a comment |
If you don't want to (or you can't) use a previous version of the Universal C Runtime, you can use _getwch instead of _getch, as the problem doesn't affect to _getwch function.
Note that _getwch can return Unicode characters, so it may return distinct values than _getch for some keys. For example, for € character, _getch returns 0x3f (?) while _getwch returns 0x20ac (Unicode value for €)
answered Oct 30 '18 at 12:53
gusitoguaygusitoguay
1106
add a comment |
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2 Answers
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active
oldest
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2 Answers
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active
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active
oldest
votes
Well, crap!
It's a (rather new) bug in windows.
https://developercommunity.visualstudio.com/content/problem/247770/-getch-broken-in-vs-157.html
"When building a console application using the _getch() function
suddenly returns two times for each keypress"
got the following response from microsoft:
" Thanks for reporting this! This will be fixed on a future windows
update."
UPDATE:
As stated in the link above, setting the runtime to statically link with a previous version of the C runtime will fix the issue, but you need to make sure all your related projects (if you are building a library, for example) also use the same runtime. (I tested it)
answered Aug 10 '18 at 18:56
Vincent HubertVincent Hubert
1,161819
add a comment |
Well, crap!
It's a (rather new) bug in windows.
https://developercommunity.visualstudio.com/content/problem/247770/-getch-broken-in-vs-157.html
"When building a console application using the _getch() function
suddenly returns two times for each keypress"
got the following response from microsoft:
" Thanks for reporting this! This will be fixed on a future windows
update."
UPDATE:
As stated in the link above, setting the runtime to statically link with a previous version of the C runtime will fix the issue, but you need to make sure all your related projects (if you are building a library, for example) also use the same runtime. (I tested it)
answered Aug 10 '18 at 18:56
Vincent HubertVincent Hubert
1,161819
add a comment |
Well, crap!
It's a (rather new) bug in windows.
https://developercommunity.visualstudio.com/content/problem/247770/-getch-broken-in-vs-157.html
"When building a console application using the _getch() function
suddenly returns two times for each keypress"
got the following response from microsoft:
" Thanks for reporting this! This will be fixed on a future windows
update."
UPDATE:
As stated in the link above, setting the runtime to statically link with a previous version of the C runtime will fix the issue, but you need to make sure all your related projects (if you are building a library, for example) also use the same runtime. (I tested it)
answered Aug 10 '18 at 18:56
Vincent HubertVincent Hubert
1,161819
Well, crap!
It's a (rather new) bug in windows.
https://developercommunity.visualstudio.com/content/problem/247770/-getch-broken-in-vs-157.html
"When building a console application using the _getch() function
suddenly returns two times for each keypress"
got the following response from microsoft:
" Thanks for reporting this! This will be fixed on a future windows
update."
UPDATE:
As stated in the link above, setting the runtime to statically link with a previous version of the C runtime will fix the issue, but you need to make sure all your related projects (if you are building a library, for example) also use the same runtime. (I tested it)
answered Aug 10 '18 at 18:56
Vincent HubertVincent Hubert
1,161819
edited Aug 10 '18 at 19:29
answered Aug 10 '18 at 18:56
Vincent HubertVincent Hubert
1,161819
answered Aug 10 '18 at 18:56
Vincent HubertVincent Hubert
1,161819
answered Aug 10 '18 at 18:56
Vincent HubertVincent Hubert
1,161819
1,161819
add a comment |
add a comment |
If you don't want to (or you can't) use a previous version of the Universal C Runtime, you can use _getwch instead of _getch, as the problem doesn't affect to _getwch function.
Note that _getwch can return Unicode characters, so it may return distinct values than _getch for some keys. For example, for € character, _getch returns 0x3f (?) while _getwch returns 0x20ac (Unicode value for €)
answered Oct 30 '18 at 12:53
gusitoguaygusitoguay
1106
add a comment |
If you don't want to (or you can't) use a previous version of the Universal C Runtime, you can use _getwch instead of _getch, as the problem doesn't affect to _getwch function.
Note that _getwch can return Unicode characters, so it may return distinct values than _getch for some keys. For example, for € character, _getch returns 0x3f (?) while _getwch returns 0x20ac (Unicode value for €)
answered Oct 30 '18 at 12:53
gusitoguaygusitoguay
1106
add a comment |
If you don't want to (or you can't) use a previous version of the Universal C Runtime, you can use _getwch instead of _getch, as the problem doesn't affect to _getwch function.
Note that _getwch can return Unicode characters, so it may return distinct values than _getch for some keys. For example, for € character, _getch returns 0x3f (?) while _getwch returns 0x20ac (Unicode value for €)
answered Oct 30 '18 at 12:53
gusitoguaygusitoguay
1106
If you don't want to (or you can't) use a previous version of the Universal C Runtime, you can use _getwch instead of _getch, as the problem doesn't affect to _getwch function.
Note that _getwch can return Unicode characters, so it may return distinct values than _getch for some keys. For example, for € character, _getch returns 0x3f (?) while _getwch returns 0x20ac (Unicode value for €)
answered Oct 30 '18 at 12:53
gusitoguaygusitoguay
1106
answered Oct 30 '18 at 12:53
gusitoguaygusitoguay
1106
answered Oct 30 '18 at 12:53
gusitoguaygusitoguay
1106
answered Oct 30 '18 at 12:53
gusitoguaygusitoguay
1106
1106
add a comment |
add a comment |
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How do you know it's a null character? BTW
_getch()returnsint.– n.m.
Aug 10 '18 at 18:48
2
works as expected for me, have you tried printing the numerical value of c to see what it is?
– Alan Birtles
Aug 10 '18 at 18:48
I know it's a null because I traced it into the debugger. I tried with either int or char, I got the same result.
– Vincent Hubert
Aug 10 '18 at 18:52
1
This is apparently a problem in some versions of Windows SDK, see developercommunity.visualstudio.com/content/problem/247770/…
– n.m.
Aug 10 '18 at 18:55
1
@AlanBirtles: it works for me in Debug mode but fails in Release mode. Same behavior as OP.
– Thomas Weller
Aug 10 '18 at 18:55