问题让 NSTask 和 SMJobSubmit 正常运行答案

【问题标题】：Issue getting NSTask and SMJobSubmit to run properly问题让 NSTask 和 SMJobSubmit 正常运行
【发布时间】：2014-08-04 15:32:13
【问题描述】：

据我所知，这段代码应该以提升的权限运行我的脚本，但 NSTask 似乎并没有真正启动。我对 Objective-C 和 Cocoa 比较陌生，所以我可能在这里遗漏了一些简单的东西，但无论哪种方式，我都不知道为什么这不起作用。

CFErrorRef error;
AuthorizationItem authItem = { kSMRightBlessPrivilegedHelper, 0, NULL, 0 };
AuthorizationRights authRights = { 1, &authItem };
AuthorizationFlags flags = kAuthorizationFlagInteractionAllowed | kAuthorizationFlagPreAuthorize | kAuthorizationFlagExtendRights;
AuthorizationRef auth;

if(AuthorizationCreate(&authRights, kAuthorizationEmptyEnvironment, flags, &auth) == errAuthorizationSuccess)
{
    NSString* myLabel = @"com.hidden.backup";
    (void) SMJobRemove( kSMDomainSystemLaunchd, (__bridge CFStringRef)myLabel, auth, false, NULL );

    NSString *path = [[NSBundle mainBundle] pathForResource:@"kandorBackup" ofType:@"sh"];
    NSPipe *outputPipe = [NSPipe pipe];
    readHandle = [outputPipe fileHandleForReading];
    inData = nil;
    returnValue = nil;

    NSTask *task = [[NSTask alloc] init];
    [task setLaunchPath:path];
    [task setArguments:[NSArray arrayWithObjects:login, selectedDrive, rsyncFinalFlags, nil]];
    [task setStandardOutput:outputPipe];
    [readHandle waitForDataInBackgroundAndNotify];
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(recievedData:)
                                                 name:NSFileHandleDataAvailableNotification
                                               object:nil];

    SMJobSubmit( kSMDomainSystemLaunchd, (__bridge CFDictionaryRef)task, auth, &error);
}

如果有帮助，我会在 Xcode 调试区域收到这两个错误：

2014-08-04 11:44:39.169 <hidden>[68065:303] -[NSConcreteTask objectForKey:]: unrecognized selector sent to instance 0x600000099d70
2014-08-04 11:44:39.169 <hidden>[68065:303] Exception detected while handling key input.

【问题讨论】：

标签： cocoa nstask

【解决方案1】：

SMJobSubmit 不用于提升 NSTask。您宁愿构造一个与 LaunchDaemon/LaunchAgent plist 文件格式相同的 NSDictionary，并将该 NSDictionary 传递给 SMJobSubmit。

你会这样做

NSDictionary *dictionary = @{@"ProgramArguments": @[path,login, selectedDrive, rsyncFinalFlags]};
SMJobSubmit( kSMDomainSystemLaunchd, (__bridge CFDictionaryRef)dictionary, auth, &error);

不幸的是，您将不会收到任何进度消息，如果这是必要的，您将需要构建一个特权帮助工具并从那里执行 NSTask。

https://developer.apple.com/library/mac/samplecode/EvenBetterAuthorizationSample/Listings/Read_Me_About_EvenBetterAuthorizationSample_txt.html

【讨论】：