将变量从AngelScript传递到C++

Question

我想将一个变量从AngelScript传递给C++。

我已经设法将函数从AngelScript传递给C++，反之亦然。

我也可以将变量从C++传递给AngelScript，但是我不知道如何进行相反的操作。

手册对我没有帮助，或者是我监督了那部分。

你能给我个提示吗？

编辑：

正如评论中提到的，我已经设法做到了。

在我的test.as文件中：

int add(int a, int b)
{
    print("Hello World, I'm AngelScript\n");
    multi(5, 13);
    print("c is " + c + "\n");
    return (a + b);
}

我的test.cpp文件：

int multi(int x, int y)
{
    int z = x * y;
    cout << "x aus dem Skript: " << x << endl;
    cout << "y aus dem Skript: " << y << endl;
    printf("Ergebnis von multi x * y: %d\n", z);
    return z;
}

void print(string &msg)
{
    printf("%s", msg.c_str());
}

int _tmain(int argc, _TCHAR* argv[])
{
    int r;
    int c = 42;

    asIScriptEngine *engine = asCreateScriptEngine(ANGELSCRIPT_VERSION);

    RegisterStdString(engine);

    // pass function print to angelscript
    r = engine->RegisterGlobalFunction("void print(const string &in)", asFUNCTION(print), asCALL_CDECL); assert(r >= 0);
    // pass function multi to angelscript
    r = engine->RegisterGlobalFunction("int multi(int, int)", asFUNCTION(multi), asCALL_CDECL); assert(r >= 0);
    // pass variable c to angelscript
    r = engine->RegisterGlobalProperty("int c", &c); assert(r >= 0);

    FILE *f = fopen("test.as", "rb");

    fseek(f, 0, SEEK_END);
    int len = ftell(f);
    fseek(f, 0, SEEK_SET);

    string script;
    script.resize(len);
    fread(&script[0], len, 1, f);

    fclose(f);

    mod->AddScriptSection("script", &script[0], len);
    mod->Build();

    asIScriptContext *ctx = engine->CreateContext();

    // get function add from angelscript
    asIScriptFunction *func = engine->GetModule("test.as")->GetFunctionByDecl("int add(int, int)");

    ctx->Prepare(func);
    ctx->SetArgDWord(0, 7);
    ctx->SetArgDWord(1, 20);

    if (ctx->Execute() == asEXECUTION_FINISHED)
    {
        asDWORD returnValue = ctx->GetReturnDWord();
        cout << "Result of a + b is: " << returnValue << endl;
    }

    ctx->Release();
    engine->Release();

    return 0;
}

Answer 1

这是我在运行您在做了一些小修改后发布的代码时的输出。

https://gyazo.com/cb264842efa76d153f9f5c0f962b391d

下面是添加小更改后的代码，我将解释我在后面添加了什么。

int multi(int x, int y)
{
    int z = x * y;
    cout << "x aus dem Skript: " << x << endl;
    cout << "y aus dem Skript: " << y << endl;
    printf("Ergebnis von multi x * y: %d\n", z);
    return z;
}

void print(string &msg)
{
    printf("%s", msg.c_str());
}

int _tmain(int argc, _TCHAR* argv[])
{
    int r;
    int c = 42;

    asIScriptEngine *engine = asCreateScriptEngine(ANGELSCRIPT_VERSION);

    RegisterStdString(engine);

    // pass function print to angelscript
    r = engine->RegisterGlobalFunction("void print(const string &in)", asFUNCTION(print), asCALL_CDECL); assert(r >= 0);
    // pass function multi to angelscript
    r = engine->RegisterGlobalFunction("int multi(int, int)", asFUNCTION(multi), asCALL_CDECL); assert(r >= 0);
    // pass variable c to angelscript
    r = engine->RegisterGlobalProperty("int c", &c); assert(r >= 0);

    FILE *f = fopen("test.as", "rb");

    fseek(f, 0, SEEK_END);
    int len = ftell(f);
    fseek(f, 0, SEEK_SET);

    string script;
    script.resize(len);
    fread(&script[0], len, 1, f);

    fclose(f);

    // create our module and add our script section to it then build!
    asIScriptModule *mod = engine->GetModule(0, asGM_ALWAYS_CREATE);
    r = mod->AddScriptSection("script", &script[0], len); assert(r >= 0);
    r = mod->Build(); assert(r >= 0);

    asIScriptContext *ctx = engine->CreateContext();

    // get function add from angelscript
    asIScriptFunction *func = mod->GetFunctionByDecl("int add(int, int)");

    ctx->Prepare(func);
    ctx->SetArgDWord(0, 7);
    ctx->SetArgDWord(1, 20);

    if (ctx->Execute() == asEXECUTION_FINISHED)
    {
        asDWORD returnValue = ctx->GetReturnDWord();
        cout << "Result of a + b is: " << returnValue << endl;
    }

    ctx->Release();
    engine->Release();

    return 0;
}

我所要改变的就是我如何构建模块，因为您没有发布如何创建模块。如果你复制并粘贴我的东西，它就能完美地工作

    // create our module and add our script section to it then build!
    asIScriptModule *mod = engine->GetModule(0, asGM_ALWAYS_CREATE);
    r = mod->AddScriptSection("script", &script[0], len); assert(r >= 0);
    r = mod->Build(); assert(r >= 0);

现在我已经有了模块指针，所以在通过声明获取函数时可以直接使用它。

    // get function add from angelscript
    asIScriptFunction *func = mod->GetFunctionByDecl("int add(int, int)");

您定义多个函数的方式是正确的，以及它应该如何完成。我不知道你的问题到底在哪里，但我猜是你如何创建模块的，也许你用错误的名字加载了它。我希望这能帮上忙！