need help with #error - Printable Version

need help with #error - Printable Version

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+--- Thread: need help with #error (/showthread.php?tid=294970)

need help with #error - System64 - 04.11.2011

Hi guys

I have a small problem again, so basicly I made a function with slot balbalbal maximum slot is 3 and I want to make if user put slot on 4 or -1 or smaller he get error in pawn complier but I always get an error

pawn Код:

stock IsHouseWeaponSlotFree(houseid, slot)
{
    if(slot >= 4)
    {
        #error weapon slot can be beetwen 0 and 3!
        return 0;
    }
    switch(slot)
    {
        case 1:
        {
            if(HouseInfo[houseid][hWeaponID1] < 1) return 1;
            else return 0;
        }
        case 2:
        {
            if(HouseInfo[houseid][hWeaponID2] < 1) return 1;
            else return 0;
        }
        case 3:
        {
            if(HouseInfo[houseid][hWeaponID3] < 1) return 1;
            else return 0;
        }
    }
    return slot;
}
//test command 
YCMD:htest(playerid, params[], help)
{
    #pragma unused help
    new houseid1, dure[128];
    if(sscanf(params, "i", houseid1)) return SendClientMessage(playerid, -1, "Usage: /hprice [House ID]");
    /*format(dure, sizeof(dure), "Weapon ID of house ID %d is %d", houseid1, GetHouseWeaponID2Ammo(houseid1));
    SendClientMessage(playerid, COLOR_ORANGE, dure);*/
    if(IsHouseWeaponSlotFree(houseid1, 2)) return SendClientMessage(playerid, -1, "House slot is free!");
    else SendClientMessage(playerid, -1, "House slot is not free!");
    return 1;
}

Re: need help with #error - Simon - 04.11.2011

#error is a pre-processor directive. It works with the pre-processor and is stripped out at run-time i.e. it's not compiled into your code.

If you want to use #error with a condition then you'll have to use #if, which again is done at compiling time (not while the gamemode is running). An example of using #error with conditions is to do the following:

pawn Код:

#define MY_THING true

#if MY_THING == true
    #error Yar, MY_THING be true.
#endif

Not extremely useful. It's perhaps more of a tool for library writers (when there's invalid combinations of #defines)

Re: need help with #error - System64 - 04.11.2011

oh thanks, simone, I got an error, I don't understand why

pawn Код:

#if slot >= 4 //this line
        #error weapon slot can be beetwen 0 and 3!
    #endif

D:\A lot of shit\iStunt\pawno\include\SSR\S32_House.inc(275) : error 008: must be a constant expression; assumed zero

Re: need help with #error - Simon - 04.11.2011

Quote:

Originally Posted by System64

oh thanks, simone, I got an error, I don't understand why

pawn Код:

#if slot >= 4 //this line
        #error weapon slot can be beetwen 0 and 3!
    #endif

D:\A lot of shit\iStunt\pawno\include\SSR\S32_House.inc(275) : error 008: must be a constant expression; assumed zero

The variable "slot" is not a constant. It's not possible for the compiler to know what its value is when you compile your script.

Re: need help with #error - Calgon - 04.11.2011

'slot' is a dynamic number variable, you can't use #if with them, you can only use #if with constants.

What ****** and Simon are trying to say is that #error is not the appropriate prompt here, a client message or maybe a print() could be. #error is only to bring up errors in the compiler when required, not for errors in the client, for example when someone tries to load a weapon in to a slot that doesn't exist.

In short:

Quote:

Originally Posted by EvgeN 1137

"slot" is not define

Sorry for jumping in, may seem rude.

Re: need help with #error - EvgeN 1137 - 04.11.2011

"slot" is not define

Re: need help with #error - System64 - 04.11.2011

oaky than, thanks guys!