roseeast/mapstealer

Club Mapstealer

ASI plugin for GTA San Andreas + SAMP — intercepts object packets from a server in real-time and exports them to a ready-to-use .pwn file.

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How It Works

The plugin is loaded automatically by ASI Loader when GTA SA starts. It hooks IncomingPacket inside samp.dll using MinHook, intercepting every CreateObject, SetMaterial, SetMaterialText, and RemoveBuilding packet sent by the server and storing them in memory. When recording is stopped, all data is flushed to a .pwn file.

Server SAMP
    │  RakNet UDP
    ▼
samp.dll → IncomingPacket()
    │  ← hooked here
    ▼
HookedIncomingPacket()
    ├── 0x5A  CreateObject    → store in g_objects[]
    ├── 0x5C  DestroyObject   → remove from g_stream[]
    ├── 0x7A  SetMaterial     → append to object entry
    ├── 0x7B  SetMaterialText → append to object entry
    └── 0x7C  RemoveBuilding  → store in g_rbTemp[]

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Prerequisites

Required Visual Studio components:

• Desktop development with C++
• Windows SDK (any version)
• MSVC v143 or v142 build tools

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Project Structure

club_mapstealer/
├── club_mapstealer.cpp       # main source
├── club_mapstealer.def       # module definition (export)
├── club_mapstealer.vcxproj   # Visual Studio project
├── include/
│   └── MinHook.h
└── lib/
    └── MinHook.x86.lib

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Build

1. Download MinHook

Download MinHook_133_bin.zip and copy:

MinHook.h        → include/MinHook.h
MinHook.x86.lib  → lib/MinHook.x86.lib

2. Add the dependency to the project

Project → Properties → Linker → Input → Additional Dependencies

Add: lib\MinHook.x86.lib

3. Hook IncomingPacket

Inside MainThread, hook samp.dll:

#include "MinHook.h"

typedef bool (__cdecl* IncomingPacket_t)(void* rakPeer, unsigned char* data, int length, const char* ip);
IncomingPacket_t OrigIncomingPacket = nullptr;

bool __cdecl HookedIncomingPacket(void* rakPeer, unsigned char* data, int length, const char* ip)
{
    if (length > 0) {
        switch (data[0]) {
            case 0x5A: ParseCreateObject(data, length);   break;
            case 0x5C: ParseDestroyObject(data, length);  break;
            case 0x7A: ParseSetMaterial(data, length);    break;
            case 0x7B: ParseSetMatText(data, length);     break;
            case 0x7C: ParseRemoveBuilding(data, length); break;
        }
    }
    return OrigIncomingPacket(rakPeer, data, length, ip);
}

// In MainThread:
HMODULE hSamp = GetModuleHandleA("samp.dll");
DWORD base = (DWORD)hSamp;

MH_Initialize();
MH_CreateHook((LPVOID)(base + 0xXXXXX), &HookedIncomingPacket, (LPVOID*)&OrigIncomingPacket);
MH_EnableHook(MH_ALL_HOOKS);

Note: The offset 0xXXXXX differs per SAMP version. Find it using ReClass / x32dbg or refer to sa-mp-reverse.

4. Hook chat commands

typedef void(__cdecl* ClientCmd_t)(const char* cmd);
ClientCmd_t OrigClientCmd;

void __cdecl HookedClientCmd(const char* cmd) {
    if (!HandleCommand(cmd))
        OrigClientCmd(cmd);
}

5. Compile

Set configuration to Release | Win32, then:

Ctrl+Shift+B

Output: Release/club_mapstealer.asi

Alternatively with MinGW:

g++ -m32 -shared -o club_mapstealer.asi club_mapstealer.cpp \
    -static -lstdc++ -lkernel32 -luser32

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Installation

1. Make sure ASI Loader is installed in your GTA SA folder (dinput8.dll or vorbisFile.dll)
2. Copy club_mapstealer.asi to the root GTA SA folder
3. Launch GTA SA and join a SAMP server
4. Type /maphelp in chat to confirm the plugin is active

Output is saved to: <GTA SA folder>\cmap\

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Usage

1. Join the server whose map you want to record

2. Move to the target area
   (the plugin only captures objects within g_maxDist radius)

3. Optional: extend the capture range
   /setrendermap 300

4. Start recording
   /maprecord

5. Walk around the server area
   SAMP only streams objects close to the player's position

6. Stop and save
   /maprecord  (or wait for autosave every 100 objects)

7. Open the .pwn file at: GTA SA folder\cmap\filename.pwn

Tips:

• Use /flymode to cover the area faster
• Use /saveslot 1 before moving to a new area as a backup
• Use /nearobj 50 to check which objects have been captured

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Commands

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Output Format

// Club Map Stealer | dist: 200
// Objects: 42 | Materials: 10 | Text: 3 | RemoveBuildings: 5

public OnGamemodeInit()
{
    new cmap;
    cmap = CreateDynamicObject(1337, 100.0000, 200.0000, 10.0000, 0.0000, 0.0000, 0.0000, -1, -1, -1, 200.0, 200.0);
    SetDynamicObjectMaterial(cmap, 0, 1337, "matname", "texname", 0);
}

public OnPlayerConnect(playerid)
{
    RemoveBuildingForPlayer(playerid, 700, 100.000, 200.000, 10.000, 0.250);
}

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Troubleshooting

Plugin doesn't load Make sure ASI Loader is installed — check for dinput8.dll or another loader file in your GTA SA folder.

Commands don't respond The chat command hook isn't fully implemented. Add a hook to SendChat or WndProc inside MainThread.

Empty .pwn file The packet hook isn't active. Make sure the IncomingPacket offset is correct for your SAMP version.

Objects not being captured Verify g_recording = true (type /maprecord) and that your player position is within MAX_DIST.

SAMP 0.3DL Offsets differ from 0.3.7. Use an offset finder tool for the correct version.

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References

• SAMP-API — SAMP internals
• MinHook — hooking library
• plugin-sdk — GTA SA plugin SDK (optional)
• sa-mp-reverse — SAMP packet offsets