experiment: process communication depend by registry

/// @file srcProcessCommunicationDependRegistry.cpp /// @brief KEY_WOW64_64KEY or KEY_WOW64_32KEY use on RegXX functions/// @title experiment: process communication depend by registry/// @reference http://www.codeproject.com/Articles/14200/Registry-Redirector-in-x64-IA64/#include "stdafx.h"#include <windows.h>#include <tchar.h>#include <string>#ifndef G_REG_KEY_NAME#define G_REG_KEY_NAME_T("SOFTWARE\\LsApp\\Parameter")#define G_REG_VALUE_NAME_T("ProcessId")#endifDWORD WriteProcessHandleOnX86();DWORD ReadProcessHandelOnX64();int _tmain(int argc, _TCHAR* argv[]){LONG lRc = 0;lRc = WriteProcessHandleOnX86();_tprintf(_T("%s = %d\n"), _T("WriteProcessHandleOnX86"), lRc);lRc = ReadProcessHandelOnX64();_tprintf(_T("%s = %d\n"), _T("ReadProcessHandelOnX64"), lRc);getchar();/// run result/// run x86 version first/**On X86 write: szValue = 4660WriteProcessHandleOnX86 = 0ReadProcessHandelOnX64 = 1*//// run x64 version/**WriteProcessHandleOnX86 = 1On X64 Read: szValue = 4660ReadProcessHandelOnX64 = 0*/return 0;}DWORD WriteProcessHandleOnX86(){LONG lRc = S_FALSE;#if _M_IX86HKEY hKey = NULL;TCHAR szValue[_MAX_PATH];::ZeroMemory(szValue, sizeof(szValue));lRc = RegOpenKeyEx(HKEY_LOCAL_MACHINE, G_REG_KEY_NAME, NULL, KEY_ALL_ACCESS | KEY_WOW64_64KEY, &hKey);if(ERROR_SUCCESS != lRc){/// if key not exist, try to create itlRc = RegCreateKeyEx(HKEY_LOCAL_MACHINE,G_REG_KEY_NAME, 0, NULL, 0, KEY_ALL_ACCESS | KEY_WOW64_64KEY, NULL, &hKey, NULL);}if(ERROR_SUCCESS != lRc){goto _WriteProcessHandleOnX86_END;}_stprintf(szValue, _T("%d"), GetCurrentProcessId());_tprintf(_T("%s: %s = %s\n"), _T("On X86 write"), _T("szValue"), szValue);RegSetValueEx(hKey, G_REG_VALUE_NAME, 0, REG_SZ,(const BYTE*) szValue,(_tcslen(szValue) + 1) * sizeof(TCHAR));_WriteProcessHandleOnX86_END:if(hKey){RegCloseKey(hKey);}#endifreturn lRc;}DWORD ReadProcessHandelOnX64(){LONG lRc = S_FALSE;#if _M_X64HKEY hKey = NULL;TCHAR szValue[_MAX_PATH];DWORD nLenValue = sizeof(szValue);::ZeroMemory(szValue, sizeof(szValue));lRc = RegOpenKeyEx(HKEY_LOCAL_MACHINE, G_REG_KEY_NAME, NULL, KEY_ALL_ACCESS | KEY_WOW64_64KEY, &hKey);if(ERROR_SUCCESS != lRc){/// x86 application write to registry, x64 application read back onlygoto _ReadProcessHandelOnX64_END;}lRc = RegQueryValueEx(hKey, G_REG_VALUE_NAME, NULL, NULL, (BYTE*)szValue, &nLenValue);if(ERROR_SUCCESS == lRc){_tprintf(_T("%s: %s = %s\n"), _T("On X64 Read"), _T("szValue"), szValue);}_ReadProcessHandelOnX64_END:if(hKey){RegCloseKey(hKey);}#endifreturn lRc;}