Question

我一直在尝试转换代码（页面上的第二个样本）：http://unity3d.com/support/documentation/ScriptReference/WWWForm.html

..到Unity3D中的C＃：

void Start () 
{   
    string dataUrl = "http://www.my-site.com/game/test.php";
    string playName = "Player 1";
    int score = -1;

    // Create a form object for sending high score data to the server
    var form = new WWWForm();
    // Assuming the perl script manages high scores for different games
    form.AddField( "game", "MyGameName" );
     // The name of the player submitting the scores
    form.AddField( "playerName", playName );
     // The score
    form.AddField( "score", score );

    // Create a download object
    WWW downloadW = new WWW( dataUrl, form );

    // Wait until the download is done
    yield return downloadW;


    if(downloadW.error == null) {
        print( "Error downloading: " + downloadW.error );
        return false;
    } else {
        // show the highscores
        Debug.Log(downloadW.text);
    }
}

我收到以下错误：

错误CS1624：rr2game.Start()' cannot be an iterator block because void的主体不是迭代器接口类型

在做了一些阅读后，我尝试将void Start（）更改为IEnumerator Start（） ..但它说没有声明IEnumerator ..？

如果我注释掉yield命令，错误就会消失，但当然数据不会加载。

请有人帮忙吗？谢谢。

Answer 1

您需要更改Start()的返回类型，Start回调支持void和IEnumerator，因为它是返回类型。

IEnumerator Start () 
{   
    string dataUrl = "http://www.my-site.com/game/test.php";
    string playName = "Player 1";
    int score = -1;

    // Create a form object for sending high score data to the server
    var form = new WWWForm();
    // Assuming the perl script manages high scores for different games
    form.AddField( "game", "MyGameName" );
     // The name of the player submitting the scores
    form.AddField( "playerName", playName );
     // The score
    form.AddField( "score", score );

    // Create a download object
    WWW downloadW = new WWW( dataUrl, form );

    // Wait until the download is done
    yield return downloadW;


    if(downloadW.error == null) {
        print( "Error downloading: " + downloadW.error );
        return false;
    } else {
        // show the highscores
        Debug.Log(downloadW.text);
    }
}

返回类型为IEnumerator后，您可以使用yield关键字。

大多数回调都允许您返回IEnumerator，其中一些不可以：Awake，Update，LateUpdate，FixedUpdate，OnGUI，OnEnable，OnDisable，OnDestroy。您需要检查事件回调的文档，看它是否不支持作为协同例程。

Answer 2

yield不能在Start（）函数中使用，需要在自己的线程中调用，而不是试试这个：

void Start()
{
    StartCoroutine(SaveScore());
}

IEnumerator SaveScore() 
{   
    string dataUrl = "http://www.my-site.com/game/test.php";
    string playName = "Player 1";
    int score = -1;

    // Create a form object for sending high score data to the server
    var form = new WWWForm();
    // Assuming the perl script manages high scores for different games
    form.AddField( "game", "MyGameName" );
     // The name of the player submitting the scores
    form.AddField( "playerName", playName );
     // The score
    form.AddField( "score", score );

    // Create a download object
    WWW downloadW = new WWW( dataUrl, form );

    // Wait until the download is done
    yield return downloadW;


    if(!string.IsNullOrEmpty(downloadW.error)) {
        print( "Error downloading: " + downloadW.error );
    } else {
        // show the highscores
        Debug.Log(downloadW.text);
    }
}

yield和WWWForm错误

2 个答案: