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  1. //in some program
  2.  
  3. int AMXAPI amx_GetAddr(AMX *amx,cell amx_addr,cell **phys_addr)
  4. {
  5.   AMX_HEADER *hdr;
  6.   unsigned char *data;
  7.  
  8.   assert(amx!=NULL);
  9.   hdr=(AMX_HEADER *)amx->base;
  10.   assert(hdr!=NULL);
  11.   assert(hdr->magic==AMX_MAGIC);
  12.   data=(amx->data!=NULL) ? amx->data : amx->base+(int)hdr->dat;
  13.  
  14.   assert(phys_addr!=NULL);
  15.   if (amx_addr>=amx->hea && amx_addr<amx->stk || amx_addr<0 || amx_addr>=amx->stp) {
  16.     *phys_addr=NULL;
  17.     return AMX_ERR_MEMACCESS;
  18.   } /* if */
  19.  
  20.   *phys_addr=(cell *)(data + (int)amx_addr);
  21.   return AMX_ERR_NONE;
  22. }
  23.  
  24. // native GetPlayerPos(playerid, &Float:x, &Float:y, &Float:z)
  25. static cell AMX_NATIVE_CALL n_GetPlayerPos(AMX *amx, cell *params)
  26. {
  27.     CHECK_PARAMS(4);//check if params[0] = 4*4 (4*sizeof(cell))
  28.  
  29.     cell* cptr;//a pointer
  30.     amx_GetAddr(amx, params[2], &cptr);//get address of params[2]
  31.     *cptr = amx_ftoc(pPlayer->m_vecPos.X);//set params[2]
  32.     amx_GetAddr(amx, params[3], &cptr);//etc
  33.     *cptr = amx_ftoc(pPlayer->m_vecPos.Y);
  34.     amx_GetAddr(amx, params[4], &cptr);
  35.     *cptr = amx_ftoc(pPlayer->m_vecPos.Z);
  36.     return 1;
  37. }
  38.  
  39. //My DLL:
  40.  
  41. ///////////////////////////////////////////////////////
  42. // From "amx.c", part of the PAWN language runtime:
  43. // http://code.google.com/p/pawnscript/source/browse/trunk/amx/amx.c
  44.  
  45. ucell GetPlayerPosAddress = NULL;
  46. cell GetPlayerPosPositionData[6] = {4*sizeof(cell),NULL,NULL,NULL,NULL,NULL};
  47. AMX FakeAMX;
  48.  
  49. #define USENAMETABLE(hdr) \
  50.     ((hdr)->defsize==sizeof(AMX_FUNCSTUBNT))
  51.  
  52. #define NUMENTRIES(hdr,field,nextfield) \
  53. 	(unsigned)(((hdr)->nextfield - (hdr)->field) / (hdr)->defsize)
  54.  
  55. #define GETENTRY(hdr,table,index) \
  56. 	(AMX_FUNCSTUB *)((unsigned char*)(hdr) + (unsigned)(hdr)->table + (unsigned)index*(hdr)->defsize)
  57.  
  58. #define GETENTRYNAME(hdr,entry) \
  59. 	(USENAMETABLE(hdr) ? \
  60. 		(char *)((unsigned char*)(hdr) + (unsigned)((AMX_FUNCSTUBNT*)(entry))->nameofs) : \
  61. 		((AMX_FUNCSTUB*)(entry))->name)
  62.  
  63. typedef ucell AMX_NATIVE_CALL n_GetPlayerPos( AMX* amx, cell* params );//call to the function in program
  64. n_GetPlayerPos* func_GetPlayerPos = NULL;//the function call addr
  65.  
  66. int GetPlayerPos(int playerid,float *x,float *y,float *z)
  67. {
  68. 	GetPlayerPosPositionData[0] = 4*sizeof(cell);
  69. 	GetPlayerPosPositionData[1] = playerid;
  70. 	func_GetPlayerPos(&FakeAMX,GetPlayerPosPositionData);
  71. 	std::cout << (float)amx_ctof(GetPlayerPosPositionData[3]) << std::endl;
  72. 	std::cout << (float)amx_ctof(GetPlayerPosPositionData[4]) << std::endl;
  73. 	std::cout << (float)amx_ctof(GetPlayerPosPositionData[5]) << std::endl;
  74. 	*x = amx_ctof(GetPlayerPosPositionData[3]);
  75. 	*y = amx_ctof(GetPlayerPosPositionData[4]);
  76. 	*z = amx_ctof(GetPlayerPosPositionData[5]);
  77. 	return 1;
  78. }
  79. ///////////////////////////////////////////////////////
  80.  
  81. PLUGIN_EXPORT int PLUGIN_CALL AmxLoad( AMX *amx )
  82. {
  83. 	//Code from sscanf2.5, [PAWN]SSCANF Author: Y_Less
  84. 	int
  85. 		num,
  86. 		idx;
  87. 	// Operate on the raw AMX file, don't use the amx_ functions to avoid issues
  88. 	// with the fact that we've not actually finished initialisation yet.  Based
  89. 	// VERY heavilly on code from "amx.c" in the PAWN runtime library.
  90. 	AMX_HEADER *
  91. 		hdr = (AMX_HEADER *)amx->base;
  92. 	AMX_FUNCSTUB *
  93. 		func;
  94. 	num = NUMENTRIES(hdr, natives, libraries);
  95. 	for (idx = 0; idx != num; ++idx)
  96. 	{
  97. 		func = GETENTRY(hdr, natives, idx);
  98. 		if (!strcmp("GetPlayerPos", GETENTRYNAME(hdr, func)))
  99. 		{
  100. 			GetPlayerPosAddress = func->address;//set adress
  101. 			FakeAMX = *amx;//create a copy of a valid AMX
  102. 			FakeAMX.data = (unsigned char*)sizeof(cell);//edit the AMX to point to our data
  103. 			func_GetPlayerPos = (n_GetPlayerPos*)GetPlayerPosAddress;//assign the function address
  104. 			break;
  105. 		}
  106. 	}
  107. 	//end sscanf cut
  108. 	return 1;
  109. }
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https://ideone.com/oaHJ33
language:
C++ (gcc 8.3)
created:
13 years ago
visibility:
public

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