Uses enumerate_handles from https://gist.github.com/MarkHC/902a13d4b8eab5f2421c13e27003b180

get_handle.cpp

HANDLE get_handle_to_process(LPWSTR process)
{
    HANDLE hProcess = NULL;

    enumerate_handles([&](PSYSTEM_HANDLE_TABLE_ENTRY_INFO handle) {

        if(GetCurrentProcessId() != handle->UniqueProcessId) return STATUS_UNSUCCESSFUL;

        BOOL        found = FALSE;
        PVOID       buffer = NULL;
        ULONG       bufferSize = 0x100;
        NTSTATUS    status;
        
        //
        // 7 is the process type index. It's possible that this is different value on your system. 
        // Check the output print_handle_information for more info. You can compare the TypeName to
        // "Process" instead of doing it like this
        //
        if(handle->ObjectTypeIndex == 7) {
            WCHAR processPath[MAX_PATH] = {};
            //
            // The handle needs to have PROCESS_QUERY_INFORMATION and PROCESS_VM_READ
            // access, otherwise this call fails
            // 
            if(GetModuleFileNameExW((HANDLE)handle->HandleValue, NULL, processPath, MAX_PATH)) {
                LPWSTR filename = PathFindFileNameW(processPath);
                if(!wcscmp(filename, process)) {
                    found = TRUE;
                    hProcess = (HANDLE)handle->HandleValue;
                }
            }
        }

        //
        // STATUS_SUCCESS stops the enumeration
        //
        if(found)
            return STATUS_SUCCESS;

        return STATUS_UNSUCCESSFUL;
    });

    return hProcess;
}