transmission parameter through MapImage

[Qazwar]

using "mmap().MapImage()" how to pass a parameter to lpvReserved In DllMain

targetProcess.mmap().MapImage(L"TestDll.dll",blackbone::NoFlags, nullptr,nullptr/*,CustomArgs_t*/);

BOOL WINAPI DllMain(HANDLE hinstDLL, DWORD dwReason, LPVOID lpvReserved)
{
    switch (dwReason)
    {
    case DLL_PROCESS_ATTACH:
        if((INT)lpvReserved== 123456)
            MessageBox(0, L"ATTACH", L"TestDll", 0);
        return TRUE;

[DarthTon]

In loader

struct DllArgs
{
    char fmt[80];
    char cval[16];
    int ival;
    float fval;
    bool bval;
} dll_args;

strcpy_s( dll_args.fmt, "DllArgs received. cval: %s, ival: %d, fval: %0.3f, bval: %i\r\n" );
strcpy_s( dll_args.cval, "Some text" );
dll_args.ival = 12345;
dll_args.fval = 7.567f;
dll_args.bval = true;

CustomArgs_t cargs( &dll_args );

targetProcess.mmap().MapImage( path, flags, nullptr, nullptr, &cargs );

In DLL

struct ArgsBase
{
    long long size;
};

struct CustomArgs : ArgsBase
{
    char fmt[80];
    char cval[16];
    int ival;
    float fval;
    bool bval;
};


BOOL APIENTRY DllMain( HMODULE hModule, DWORD  ul_reason_for_call, LPVOID lpReserved )
{
    auto pArgs = (CustomArgs*)lpReserved;
    printf( pArgs->fmt, pArgs->cval, pArgs->ival, pArgs->fval, pArgs->bval );
    ...
}