not working in win 98?

[SteveCRM]

for some reason this works on xp but not on the schools 98 machines...any idea why?

#include <iostream.h>
#include <windows.h>

int GetKey();

int main()
{
	int test;
	while(1)
	{
		test = GetKey();
		if(test!=256)
			cout<<test<<endl;
	}
	
    return 0;
}

int GetKey()
{
	int num = 0;

	for(int i=0; i<256; i++)
	{
		num = GetAsyncKeyState(i);
		if(num!=0)
		{
			return i;
		}
	}
}

it says when the mouse is being clicked, but nothign works for the keyboard

[CornedBee]

Win98 sucks, but so does WinXP...

I can't help you on that, but use <iostream> anyway...

[SteveCRM]

from msdn:

Return Value

If the function succeeds, the return value specifies whether the key was pressed since the last call to GetAsyncKeyState, and whether the key is currently up or down. If the most significant bit is set, the key is down, and if the least significant bit is set, the key was pressed after the previous call to GetAsyncKeyState. However, you should not rely on this last behavior; for more information, see the Remarks. 

Windows NT/2000/XP: The return value is zero for the following cases: 

The current desktop is not the active desktop
The foreground thread belongs to another process and the desktop does not allow the hook or the journal record.
Windows 95/98/Me: The return value is the global asynchronous key state for each virtual key. The system does not check which thread has the keyboard focus.

Windows 95/98/Me: Windows 95 does not support the left- and right-distinguishing constants. If you call GetAsyncKeyState with these constants, the return value is zero.

I don't really understand if thats a problem but does that mean it will work differently in 98?

[Zaei]

Use GetKeyState() =).

Z.

[CornedBee]

GetKeyState is only for use within message handlers.

Use DirectInput

[SteveCRM]

don't have directx on the school computers

how about GetKeyboardState()? that seems like it will work...but whenever I try it I get a conversion error...haven't been able to fix it

[Zaei]

Originally posted by CornedBee
GetKeyState is only for use within message handlers.

Use DirectInput

DI is even worse... then you actually have to process the keyboard state =).

Z.

[CornedBee]

At least it represents the REAL state of the keyboard...

GetKeyboardState should work. It expects an array of chars to be passed!

GetKeyState returns the state of a key at the time of the last message - which is a little bit tricky in a console app.

[SteveCRM]

I tried that but I get this error

cannot convert parameter 1 from 'char (*)[256]' to 'unsigned char *'


char ks[256];
while(1)
{
GetKeyboardState(&ks);
for(int i=0; i<257; i++)
{
cout<<ks[i];
}
}

[Daok]

take off the &

[SteveCRM]

cannot convert parameter 1 from 'char [256]' to 'unsigned char *'

[parksie]

 for(int i=0; i<257; i++)

...should be 256

Try using unsigned char for the array then.

[SteveCRM]

could have sworn I already tried that

runs fine...but the outputs a little odd

unsigned char ks[256];
	for(int i=0;i<256; i++)
		ks[i] = NULL;
	while(1)
	{
		GetKeyboardState(ks);
		for(i=0; i<256; i++)
			cout<<ks[i];
		cout<<endl<<endl;
		Sleep(1000);
	}

[Daok]

I cannot test it cause I got 2 errors from the winuse.h

[SteveCRM]

?

just use windows.h

[SteveCRM]

#include <iostream.h>
#include <windows.h>

int main()
{
	unsigned char ks[256];
	for(int i=0;i<256; i++)
		ks[i] = NULL;
	while(1)
	{
		GetKeyboardState(ks);
		for(i=0; i<256; i++)
			cout<<ks[i];
		cout<<endl<<endl;
		Sleep(1000);
	}
	
	return 0;
}

[Daok]

That code compile but it not usefull cause it print only happy face

#include <iostream.h>
#include <windows.h>


void main()
{
	unsigned char *ks = new unsigned char[255];

	while(true)
	{
		for (int i = 0 ; i < 255 ; i++)
		{
			if(GetKeyboardState(ks) !=0)
				cout << (unsigned char)ks[i];
			else
				cout << "Error : Function GetKeyboardState fail\n";
		}//Fin du for : i
	}//End while
}//Fin du main

[Zaei]

Gotta read the function specs in the MSDN, guys =):

When the function returns, each member of the array pointed to by the lpKeyState parameter contains status data for a virtual key. If the high-order bit is 1, the key is down; otherwise, it is up. If the low-order bit is 1, the key is toggled. A key, such as the caps lock key, is toggled if it is turned on. The key is off and untoggled if the low-order bit is 0. A toggle key's indicator light (if any) on the keyboard will be on when the key is toggled, and off when the key is untoggled.

Z.

[SteveCRM]

so like this???

#include <iostream.h>
#include <windows.h>

int main()
{
	unsigned char ks[256];
	for(int i=0;i<256; i++)
		ks[i] = NULL;
	while(1)
	{
		GetKeyboardState(ks);
		for(i=0; i<256; i++)
		{
			if(HIWORD(ks[i])==1)
				cout<<i<<" ";
		}
		cout<<endl<<endl;
	}
	
	return 0;
}

[Zaei]

No, I believe:

if((ks[i]>>7)==1)

Z.

[SteveCRM]

doesn't seem to really be working for me:

#include <iostream.h>
#include <windows.h>

int main()
{
	unsigned char ks[256];
	for(int i=0;i<256; i++)
		ks[i] = NULL;
	while(1)
	{
		GetKeyboardState(ks);
		for(i=0; i<256; i++)
		{
			if((ks[i]>>7)==1)
				cout<<i<<" ";
		}
		cout<<endl<<endl;
	}
	
	return 0;
}

[CornedBee]

instead of
(ar[i] >> 7) == 1
try
(ar[i] & 0x80) != 0

where is the problem with your current code?

[SteveCRM]

I just can't get my program to output what keys im pressing...

#include <iostream.h>
#include <windows.h>

int main()
{
	unsigned char ks[256];
	bool test = true;
	while(test == true)
	{
		GetKeyboardState(ks);
		for(int i=0; i<256; i++)
		{
			if((ks[i] & 0x80) != 0)
			{
				cout<<i<<" ";
				test = false;
			}
		}
	}
	
	return 0;
}

this doesn't seem to be working either it just doesn't register anything in the if statement this way

[Zaei]

This is annoying... Id like to put it down to this being a console application. I use almost exactly the same code for processing my DInput keyboard buffer, and it works like a charm.

Z.

[CornedBee]

That could be true, maybe the console swallows the keys or something...

Use <iostream>, not <iostream.h>