产量和 WWWForm 错误

Question

我一直在尝试转换代码（页面上的第二个示例）： 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()'的主体不能是迭代器块，因为void'不是迭代器接口类型

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

如果我注释掉yield命令，错误就会消失，但数据当然不会加载。

请问有人可以帮忙吗？ 谢谢。

Answer 1

您需要更改 Start() 的返回类型，Start 回调同时支持 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);
    }
}

一旦返回类型为 IEnumerator，您就可以使用 yield 关键字。

大多数回调允许您返回 IEnumerator，有些则不能返回：Awake、Update、LateUpdate、FixedUpdate、OnGUI、OnEnable、OnDisable、OnDestroy。您需要检查事件回调的文档，看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，它需要在自己的线程中调用，而是尝试以下操作：

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);
    }
}