AlliedModders - Problem with hooked fuction

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- - Problem with hooked fuction (https://forums.alliedmods.net/showthread.php?t=299009)

Problem with hooked fuction

Hello! I'm studying the possibilities of Metamod, and I was wondering if it was possible to intercept the call of the function IBaseFileSystem::Open and call it with another parameter? I was trying to do this:

PHP Code:


		
			
SH_DECL_HOOK3(IBaseFileSystem, Open, SH_NOATTRIB, 0, FileHandle_t,  const char *, const char *, const char *);

I announced this

PHP Code:


		
			
IBaseFileSystem *basefilesystem = NULL;

GET_V_IFACE_CURRENT(GetFileSystemFactory, basefilesystem, IBaseFileSystem, BASEFILESYSTEM_INTERFACE_VERSION);

and add hook

PHP Code:


		
			
OpenHook = SH_ADD_VPHOOK(IBaseFileSystem, Open, basefilesystem, SH_MEMBER(this, &SamplePlugin::Hook_Open), false);

I tried to do so

PHP Code:


		
			
FileHandle_t SamplePlugin::Hook_Open(const char *pFileName, const char *pOptions, const char *pathID) {

   if(strncmp(pFileName, "materials/headshot1.vtf", strlen("materials/headshot1.vtf")) == 0) {

         META_LOG(g_PLAPI, "yeaaa opening headshot file \"%s\",pOptions \"%s\",pathID \"%s\".", pFileName, pOptions, pathID);

          RETURN_META_VALUE_NEWPARAMS(MRES_OVERRIDE, NULL, &IBaseFileSystem::Open, ("materials/headshot2.vtf", pOptions, pathID));

   }

RETURN_META_VALUE(MRES_IGNORED, false);

}

but not working((
If you do like this, the server is crashing

PHP Code:


		
			
FileHandle_t SamplePlugin::Hook_Open(const char *pFileName, const char *pOptions, const char *pathID) {

   if(strncmp(pFileName, "materials/headshot1.vtf", strlen("materials/headshot1.vtf")) == 0) {

    META_LOG(g_PLAPI, "yeaaa opening headshot file \"%s\",pOptions \"%s\",pathID \"%s\".", pFileName, pOptions, pathID);



    FileHandle_t myhndl = basefilesystem->Open(pFileName, pOptions, pathID);

RETURN_META_VALUE(MRES_SUPERCEDE, myhndl);

   }



RETURN_META_VALUE(MRES_IGNORED, false);



}

What did I do wrong? I tried using MRES_OVERRIDE, but it did not help...

Re: Problem with hooked fuction

You should be using MRES_IGNORED in both cases.

See https://forums.alliedmods.net/showthread.php?t=297857.

Re: Problem with hooked fuction

Quote:

Originally Posted by asherkin (Post 2532454)

You should be using MRES_IGNORED in both cases.

See https://forums.alliedmods.net/showthread.php?t=297857.

I did as you advised, but the server still crashes, the hook works, but the original function with the new parameter is not called. what should I do? I just need to replace the file name with another file name and call the open function so that it continues working

PHP Code:


		
			
FileHandle_t SamplePlugin::Hook_Open(const char *pFileName, const char *pOptions, const char *pathID) {

   if(strncmp(pFileName, "materials/headshot1.vtf", strlen("materials/headshot1.vtf")) == 0) {

         META_LOG(g_PLAPI, "yeaaa opening headshot file \"%s\",pOptions \"%s\",pathID \"%s\".", pFileName, pOptions, pathID);

          RETURN_META_VALUE_NEWPARAMS(MRES_IGNORED, NULL, &IBaseFileSystem::Open, ("materials/headshot2.vtf", pOptions, pathID));

   }

RETURN_META_VALUE(MRES_IGNORED, false);

}