rainmeter-studio/Plugins/PluginCoreTemp/SharedMem.cpp

#include <windows.h>
#include "SharedMem.h"

CSharedMemClient::CSharedMemClient(void)
{
}

CSharedMemClient::~CSharedMemClient(void)
{
}

bool CSharedMemClient::ReadSharedMem(PCORE_TEMP_SHARED_DATA i_SharedData)
{
	bool bRet = false;
	PCORE_TEMP_SHARED_DATA pSharedData;
	HANDLE hdlMemory;
	HANDLE hdlMutex;

	hdlMutex = CreateMutex(nullptr,FALSE,CORE_TEMP_MUTEX_OBJECT);
	if (hdlMutex == nullptr)
	{
		return false;
	}

	WaitForSingleObject(hdlMutex, INFINITE);

	hdlMemory = OpenFileMapping(
		FILE_MAP_READ,						// Read only permission.
		TRUE,
		CORE_TEMP_MAPPING_OBJECT);			// "CoreTempMappingObject"

	if (hdlMemory == nullptr)
	{
		ReleaseMutex(hdlMutex);
		CloseHandle(hdlMutex);
		return false;
	}

	pSharedData = (PCORE_TEMP_SHARED_DATA)MapViewOfFile(hdlMemory, FILE_MAP_READ, 0, 0, 0);
	if (pSharedData == nullptr)
	{
		CloseHandle(hdlMemory);
		hdlMemory = nullptr;
		ReleaseMutex(hdlMutex);
		CloseHandle(hdlMutex);
		return false;
	}

	__try
	{
		memcpy_s(i_SharedData, sizeof(core_temp_shared_data), pSharedData, sizeof(core_temp_shared_data));
		bRet = true;
	}
	__except(1)
	{
		bRet = false;
		SetLastError(0x20000000); //Unknown error
	}

	UnmapViewOfFile(pSharedData);
	CloseHandle(hdlMemory);
	ReleaseMutex(hdlMutex);
	CloseHandle(hdlMutex);

	return bRet;
}