How do I get error details from FBResult in Facebook Unity SDK

问题

Is there any way to get error details from the FB.API() call in the Facebook Unity SDK? This code

FB.API(
  query: "/me/achievements",
  callback: response => {
    if (!string.IsNullOrEmpty(response.Error)) {
      Logger.LogError("FB ReportProgress Error: " + response.Error);
    } else {
      Logger.Log("FB ReportProgress response: " + response.Text);
    }
  },
  method: Facebook.HttpMethod.POST,
  formData: new Dictionary<string, string>() {{"achievement", url}}
);

logs "400 Bad Request" and nothing else.

回答1:

First you have to enable MonoDevelop's debugger:

• In MonoDevelop go to the Preferences, then Unity > Debugger
• Untick "Build project in MonoDevelop" and click OK
• Run > Attach To Process...
• Select Unity Editor, click OK

Then, set a breakpoint inside the callback. Select this line in your code and select Run > New Breakpoint...

Logger.LogError("FB ReportProgress Error: " + response.Error);

Then hit Play in Unity and trigger the error (breakpoint). It'll switch to MonoDevelop. Down in the Locals debug window (which should be in a tab somewhere, otherwise View > Debug Windows > Locals) expand the FBResult object. The actual error message (which I assume you're needing) can be found under FBResult > data > responseHeaderString.

More info on MonoDevelop debugging: http://unitygems.com/debugging-game-monodevelop/

来源：https://stackoverflow.com/questions/25538683/how-do-i-get-error-details-from-fbresult-in-facebook-unity-sdk