如何使用 Il2CppInspector 将 C++ 中的 std::string 转换为 System.String？

Question

I am using Il2CppInspector to generate scaffolding for a Unity game. I am able to convert System.String ( app::String in Il2CppInspector) to std::string using the functions provided below.

How would I reverse this process; how do I convert a std::string to System.String ?

helpers.cpp

    // Helper function to convert Il2CppString to std::string
    std::string il2cppi_to_string(Il2CppString* str) {
        std::u16string u16(reinterpret_cast<const char16_t*>(str->chars));
        return std::wstring_convert<std::codecvt_utf8_utf16<char16_t>, char16_t>{}.to_bytes(u16);
    }

    // Helper function to convert System.String to std::string
    std::string il2cppi_to_string(app::String* str) {
        return il2cppi_to_string(reinterpret_cast<Il2CppString*>(str));
    }

In short, I am looking for a function that takes in a std::string and returns an app::String

    // Helper function to convert std::string to System.String
    app::String string_to_il2cppi(std::string str) {
        // Conversion code here
    }

Answer 1

Export Il2CppInspector with all namespaces, which will give you access to Marshal_PtrToStringAnsi .

app::String* string_to_il2cppi(std::string str) {
    return app::Marshal_PtrToStringAnsi((void*)&str, NULL);
}