hello there im trying to make some usermode hooks to explorer.exe process

my first goal is to hook findnextfileW api but when im going to open a directory

explorer crashes.I have spot an access violation but i cant spot why that happened

here is my source code

diafora.h

typedef struct AdressEs{	//....target
	DWORD FindNextFileW_;
	//....redirect
	DWORD FindNextFile_;
	//...data
	BYTE FindNextFileData[6];
}AdressEs;void HoonOnAddress(DWORD addr,DWORD dst);
void UnHoonOnAddress(DWORD addr,BYTE *patch);
int JMP(DWORD func,DWORD tramboline);
bool FindNextFile_(HANDLE hAndle,WIN32_FIND_DATAW *FileData);
void DumpFirstBytesBeforePatch(DWORD addr);
void InitializeHook();DWORD prot = 0;
AdressEs placeS;

hook_FindNextFileW.cpp

#include <windows.h>
#include "diafora.h"
/*
targets:
FindNextFileW
*/
#define TEST_FILE "cmd.exe"
#define nAked __declspec( naked )
void HoonOnAddress(DWORD addr,DWORD dst){	VirtualProtect((void*)addr,5,PAGE_EXECUTE_READWRITE,&prot);	*(BYTE*)(addr) = 0xe9; //jmp
	*(int*)(addr+1) = dst;}
void DumpFirstBytesBeforePatch(DWORD addr,BYTE *data){	//AdressEs placeS; //it will be replaced cos i will put more functions to hooak	for(int i = 0; i < 5; i++){
		data[i] = *(BYTE*)(addr+i);
	}}
void UnHookOnAddress(DWORD addr,BYTE *patch){	for(int i = 0; i < 5; i++){		*(BYTE*)(addr+i) = patch[i];
	}	//VirtualProtect((void*)addr,5,prot,&prot);}
int JMP(DWORD func,DWORD tramboline){	return (DWORD)(func - tramboline) - 5;
}bool FindNextFile_(HANDLE hAndle,LPWIN32_FIND_DATAW FileData){	bool returned = false;	UnHookOnAddress((DWORD)placeS.FindNextFileW_,(BYTE*)placeS.FindNextFileData);
	/*
		code will be placed here
	*/
	returned = (bool)(FindNextFileW(hAndle,FileData));
	HoonOnAddress((DWORD)placeS.FindNextFileW_,(DWORD)JMP(placeS.FindNextFile_,placeS.FindNextFileW_));
	return (bool)returned;
}void InitializeHook(){	placeS.FindNextFileW_ = (DWORD)GetProcAddress(GetModuleHandle("kernel32"),"FindNextFileW");
	placeS.FindNextFile_ = (DWORD)(FindNextFile_);	DumpFirstBytesBeforePatch((DWORD)placeS.FindNextFileW_,(BYTE *)placeS.FindNextFileData);
	HoonOnAddress((DWORD)placeS.FindNextFileW_,(DWORD)JMP(placeS.FindNextFile_,placeS.FindNextFileW_));}bool WINAPI DllMain(HANDLE hAndle, DWORD reason , LPVOID no){	if(reason == 1){		CreateThread(NULL,NULL,(LPTHREAD_START_ROUTINE)InitializeHook,NULL,NULL,0);	}	return TRUE;
}

compiled with VSCPP 6.0

Windows API have a calling convention of __stdcall, most compilers are set to have functions default to __cdecl though. Try adding __stdcall to your hook function.

bool __stdcall FindNextFile_(HANDLE hAndle,LPWIN32_FIND_DATAW FileData){

solved THNX alot u save my day(night)