code_app/modules/version/dllmain.cpp

#include "../base/HGDef.h"
#include "log/log.h"
HLOG g_hLog = nullptr;

#if defined(OEM_HANWANG)
    const char* oem = "HanvonScan";
#elif defined(OEM_LISICHENG)
    const char* oem = "LanxumScan";
#elif defined(OEM_CANGTIAN)
    const char* oem = "CumtennScan";
#elif defined(OEM_ZHONGJING)
    const char* oem = "MicrotekScan";
#elif defined(OEM_ZIGUANG)
    const char* oem = "UniScan";
#elif defined(OEM_NEUTRAL)
    const char* oem = "NeuScan";
#elif defined(OEM_DELI)
    const char* oem = "DeliScan";
#elif defined(OEM_MEISONGDA)
    const char *oem = "MaxsoundScan";
#elif defined(OEM_GUANGDIANTONG)
    const char *oem = "ToecScan";
#else
    const char* oem = "HuaGoScan";
#endif

#if defined(HG_CMP_MSC)

BOOL APIENTRY DllMain(HMODULE hModule, DWORD  ul_reason_for_call, LPVOID lpReserved)
{
	switch (ul_reason_for_call)
	{
	case DLL_PROCESS_ATTACH:
        g_hLog = EnableLog(nullptr, oem, "app");
		break;
	case DLL_THREAD_ATTACH:
		break;
	case DLL_THREAD_DETACH:
		break;
	case DLL_PROCESS_DETACH:
        DisableLog(g_hLog);
        g_hLog = nullptr;
		break;
	}

	return TRUE;
}

#else

class LogMgr
{
public:
    LogMgr()
    {
        g_hLog = EnableLog(nullptr, oem, "app");
    }

    ~LogMgr()
    {
        DisableLog(g_hLog);
        g_hLog = nullptr;
    }
};

LogMgr g_logMgr;

#endif