Unity不同平台生成中预处理的注意点

Unity3D的项目，这周吃亏在宏上了。大背景是项目需要在Unity中用Hudson自动生成不同平台的版本。

程序设计语言的预处理的概念：在编译之前进行的处理。

#if UNITY_WEBPLAYER
BuildTarget target = BuildTarget.WebPlayer;
#elif UNITY_STANDALONE_WIN && UNITY_EDITOR
BuildTarget target = BuildTarget.StandaloneWindows;
#elif UNITY_ANDROID
BuildTarget target = BuildTarget.Android;
#else
BuildTarget target = BuildTarget.iPhone;
#endif

#if UNITY_WEBPLAYER
public const string AssetRootPath = AutomaticBuild.WebPlatFormDataPath + "/";
#elif UNITY_STANDALONE_WIN && UNITY_EDITOR
public const string AssetRootPath = AutomaticBuild.WinPlatFormDataPath + "/";
#elif UNITY_ANDROID
public const string AssetRootPath = AutomaticBuild.AndRoidPlatFormDataPath + "/";
#else
public const string AssetRootPath = AutomaticBuild.IOSPlatFormDataPath + "/";
#endif

如上面两段代码，打开Unity项目（例如PC & Mac Standalone保存的）之后，再打开项目的Script（这里用VS2008+VA），会发现上述加粗行高亮。即Target和AssetRootPath在编译前已然确定，且之后不能对其做出变更。

当采用Unity支持的命令编译时C:\program files\Unity\Editor>Unity.exe -quit -batchmode -executeMethod MyEditorScript.MyMethod

此时MyMethod可能用了如下代码，

BuildPipeline.BuildPlayer( levels, "WebPlayerBuild", 
                   BuildTarget.WebPlayer, BuildOptions.None);

但 Target和AssetRootPath并没有赋予应有的Web相应值，会造成生成的Unity3D文件能生成但不对，执行BuildPlayer时会报Runtime Error错。

不禁让我想起Effective C++里的第2个条款：尽量以const, enum, inline替换 #define。果然金科玉律……

我的解决方式如下：

1.在MyMethod中先调用

SwitchActiveBuildTarget (target : BuildTarget)函数。

private static string AssetRootPath = null;

public static string GetAssetRootPath()
{
if (AssetRootPath != null)
return AssetRootPath;

if (EditorUserBuildSettings.activeBuildTarget==BuildTarget.WebPlayer)
{
AssetRootPath = "WebData/LatestData/";
}
else if (EditorUserBuildSettings.activeBuildTarget == BuildTarget.Android)
{
AssetRootPath = "AndroidData/LatestData/";
}
else if (EditorUserBuildSettings.activeBuildTarget == BuildTarget.StandaloneWindows)
{
AssetRootPath = "WinData/LatestData/";
}
else
{
AssetRootPath = "IOSData/LatestData/";
}

return AssetRootPath;
}

public static BuildTarget GetBuildTarget()
{
return EditorUserBuildSettings.activeBuildTarget;
}

由于需求的小变更，小小地重构了上次的代码：

ClearISingleFileSeries();
ClearDirectorySeries();

/// <summary>
/// 删除单个文件的数组
/// </summary>
static void ClearISingleFileSeries()
{
string[] SingleFileSeries = { Application.dataPath + "/Plugins/I18N.dll", Application.dataPath + "/Plugins/I18N.CJK.dll", Application.dataPath + "/Plugins/I18N.West.dll" };
ClearFiles(SingleFileSeries);
}

/// <summary>
/// 删除filesPath数组内指向的文件
/// </summary>
/// <param name="filesPath"></param>
static void ClearFiles(string[] filesPath)
{
foreach (string singleFilePath in filesPath)
{
if (File.Exists(singleFilePath))
{
try
{
File.Delete(singleFilePath);
}
catch (System.Exception ex)
{
//catch ex
}
}
}

}

/// <summary>
/// 删除目前做Web版本会出现内存问题的Audio资源
/// </summary>
static void ClearDirectorySeries()
{
string[] audioPath = { Application.dataPath + "/Game/Audio/Resources", Application.dataPath + "/Game/Audio/SFX", Application.dataPath + "/Game/MyGUI" };
foreach (string audioDirectory in audioPath)
{
if (Directory.Exists(audioDirectory)) //保护，避免文件目录不存在跳异常
ClearFilesAndDirectory(audioDirectory);
}
}

/// <summary>
/// 删除dataPath文件目录下的所有子文件及子文件夹
/// </summary>
/// <param name="DirectoryPath"></param>
static void ClearFilesAndDirectory(string DirectoryPath)
{
DirectoryInfo dir = new DirectoryInfo(DirectoryPath);

//文件
foreach (FileInfo fChild in dir.GetFiles("*"))
{
if (fChild.Attributes != FileAttributes.Normal)
fChild.Attributes = FileAttributes.Normal;
fChild.Delete();
}

//文件夹
foreach (DirectoryInfo dChild in dir.GetDirectories("*"))
{
if (dChild.Attributes != FileAttributes.Normal)
dChild.Attributes = FileAttributes.Normal;
ClearFilesAndDirectory(dChild.FullName);
dChild.Delete();
}
}