GetCommandLine_InDLL.cpp

// dllmain.cpp : Defines the entry point for the DLL application.
#include "pch.h"
#include <shellapi.h>


void Test() {
    LPWSTR pwszCommandLine = GetCommandLine();
    LPWSTR* argv = NULL;
    LPWSTR g_pwszGuid = NULL;
    HANDLE hEvent = NULL;
    int argc = 0;
    int i = 0;
    WCHAR wszEventName[MAX_PATH] = { 0 };
    argv = CommandLineToArgvW(pwszCommandLine, &argc);
    g_pwszGuid = argv[1];
    MessageBox(NULL, g_pwszGuid, L"caption", 0);

}

BOOL APIENTRY DllMain( HMODULE hModule,
                       DWORD  ul_reason_for_call,
                       LPVOID lpReserved
                     )
{
    switch (ul_reason_for_call)
    {
    case DLL_PROCESS_ATTACH:
        Test();

    case DLL_THREAD_ATTACH:
    case DLL_THREAD_DETACH:
    case DLL_PROCESS_DETACH:
        break;
    }
    return TRUE;
}