C - request for member ‘x’ in something not a structure or union

Question

Context: I'm trying to make a few modifications for a game called Grand Theft Auto V.

I'm using GET_ENTITY_COORDS function to get the coordinates of a entity in the game:

static Inline struct Vector3 GET_ENTITY_COORDS(Entity entity, BOOL alive) {
    args[0] = entity;
    args[1] = alive;
    invokeNative(0x3FEF770D40960D5A);
    struct Vector3 vector3 = { *(float*)&rets[0], *(float*)&rets[1], *(float*)&rets[2] };
    return vector3;
}

This should return xPos, yPos and zPos.

Now this is the code what I currently are struggling with:

#include "gta.h"

void invokeNative_s(u64 hash) {
    struct Native_s** g_Natives = (struct Native_s**)NativeTableAddress;
    struct Native_s* Natives = g_Natives[hash & 0xFF];
    while (Natives != 0) {
        for (unsigned int i = 0; i < Natives->NativeCount; i++) {
            if (Natives->NativeHashes[i] == hash) {
                ((void(*)(struct NativeArg_s*))Natives->NativeFunctions[i])((struct NativeArg_s*)FreeSpaceAddress);
                return;
            }
        }
        Natives = Natives->LastNativeTable;
    }
}

struct gtaVars_s {
    BOOL init;
    int frameCount;
};

static struct gtaVars_s *gtaVars = (struct gtaVars_s*)FreeSpaceAddress+0x100;

BOOL nativeHook() {
    if (!gtaVars->init) {
        nativeArg->ArgValues = args;
        nativeArg->ReturnValue = rets;
        gtaVars->frameCount = 0;
        gtaVars->init = TRUE;
    }

    int newFrameCount = GET_FRAME_COUNT();
    if (gtaVars->frameCount < newFrameCount) {
        gtaVars->frameCount = newFrameCount;

        Ped pedID = PLAYER_PED_ID();
        Player playerID = PLAYER_ID();

        /* define player coords */
        Vector3 playerCoords = GET_ENTITY_COORDS(pedID, 1);
        char waterRadius = 10;

        SET_SUPER_JUMP_THIS_FRAME(playerID);
        SET_PLAYER_INVINCIBLE(playerID, TRUE);

        if (IS_CONTROL_JUST_PRESSED(0, Button_Tpad)) {
            // teleport to beach
            SET_ENTITY_COORDS(pedID, -1374.881, -1398.835, 6.141, FALSE, FALSE, FALSE, TRUE);

            // set water
            MODIFY_WATER(playerCoords.x, playerCoords.y, waterRadius, 10);
            MODIFY_WATER(playerCoords.x+2, playerCoords.y, waterRadius, 10);
            MODIFY_WATER(playerCoords.x, playerCoords.y+2, waterRadius, 10);
            MODIFY_WATER(playerCoords.x+2, playerCoords.y+2, waterRadius, 10);
            MODIFY_WATER(playerCoords.x+4, playerCoords.y, waterRadius, 10);
            MODIFY_WATER(playerCoords.x, playerCoords.y+4, waterRadius, 10);
            MODIFY_WATER(playerCoords.x+4, playerCoords.y+4, waterRadius, 10);
            MODIFY_WATER(playerCoords.x+6, playerCoords.y, waterRadius, 10);
            MODIFY_WATER(playerCoords.x, playerCoords.y+6, waterRadius, 10);
            MODIFY_WATER(playerCoords.x+6, playerCoords.y+6, waterRadius, 10);
            MODIFY_WATER(playerCoords.x+8, playerCoords.y, waterRadius, 10);
            MODIFY_WATER(playerCoords.x, playerCoords.y+8, waterRadius, 10);
            MODIFY_WATER(playerCoords.x+8, playerCoords.y+8, waterRadius, 10);
        }
    }

    return TRUE;
}

But I'm getting multiple errors from the GET_ENTITY_COORDS function even though I have defined the function above in my script:

source/gta.c:42:3: error: unknown type name ‘Vector3’
   Vector3 playerCoords = GET_ENTITY_COORDS(pedID, 1);
   ^
source/gta.c:42:26: error: incompatible types when initializing type ‘int’ using type ‘struct Vector3’
   Vector3 playerCoords = GET_ENTITY_COORDS(pedID, 1);
                          ^
source/gta.c:53:29: error: request for member ‘x’ in something not a structure or union

Does anybody know what the cause of this error is, and how I can fix it? I would appreciate it a lot since I'm struggling with this for quite some days and would love to see it resolved, thank you in advance.

`Vector3` => `struct Vector3` should fix it. – Jean-François Fabre Nov 24 '17 at 22:40 — Jean-François Fabre, Nov 24 '17 at 22:40

Jean-François Fabre · Accepted Answer · 2017-11-24T22:42:58.750

as shown in some of your snippets Vector3 is used like:

static Inline struct Vector3 GET_ENTITY_COORDS

So, since this works, it means that it's defined (in some code we don't see) as struct, but not as typedef struct (which would allow to use it without struct keyword).

your error is when declaring your variable as Vector3:

Vector3 playerCoords = GET_ENTITY_COORDS(pedID, 1);

should be

struct Vector3 playerCoords = GET_ENTITY_COORDS(pedID, 1);

the rest of the errors are just a consequence of that one. The parser is lost at this point.

C - request for member ‘x’ in something not a structure or union

1 Answers1