objective-c – 无法访问NSTask启动路径.适用于Xcode. XCode显示错误

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好.关于堆栈溢出有几个问题. This question was the only question最接近地雷,但它使用通知.

代码非常简单.创建一个新的空Mac OSX项目,然后将以下代码粘贴到applicationDidFinishLaunching:方法中.它应该获取任何可执行文件的路径(在本例中为GIT).

NSTask *aTask = [[NSTask alloc] init];
NSPipe *outputPipe = [NSPipe pipe];
NSPipe *errorPipe = [NSPipe pipe];

[aTask setStandardOutput: outputPipe];
[aTask setStandardError: errorPipe];
[aTask setArguments:[NSArray arrayWithObject:@"which"]];
[aTask setLaunchPath:@"/usr/bin/git"];

NSFileHandle *outputFileHandler = [outputPipe fileHandleForReading];
NSFileHandle *errorFileHandler = [errorPipe fileHandleForReading];

[aTask launch];
[aTask waitUntilExit];

// Task launched now just read and print the data
NSData *data = [outputFileHandler readDataToEndOfFile];
NSString *outPutValue = [[NSString alloc] initWithData: data encoding: NSUTF8StringEncoding];

NSData *errorData = [errorFileHandler readDataToEndOfFile];
NSString *errorValue = [[NSString alloc] initWithData:errorData encoding:NSUTF8StringEncoding];

NSLog(@"Error value: %@",errorValue);
NSLog(@"Output Value: %@",outPutValue);

这段代码设置了两个读取管道并运行一个命令:git.

如果我在XCode中运行它,我会得到相应的结果:

Error value: ""  
Output Value: /usr/bin/git

如果我转到我的build / Products / Debug文件夹并双击可执行文件,我会在控制台应用程序上打印此消息:

问:那么,这里的问题到底是什么?请不要做出替代解决方案……我也想知道问题是什么..谢谢.

解决方法

好的结果是答案是关于堆栈溢出,但它分散在不同的问题上.

这里问的问题是 – > Commands with NSTask和这里 – > NSTask launch path not accessible也是

但截至目前为止,他们的回答并不清楚问题所在.只有在阅读了NSTask not picking up $PATH from the user’s environment的问题之后(问题标题具有误导性),并且通过这两个答案NSTask not picking up $PATH from the user’s environmentFind out location of an executable file in Cocoa我才意识到解决方案.

It looks like this is about setting up either NS
Task or the user’s shell (e.g.,~/.bashrc) so that the correct
environment ($PATH) is seen by NSTask.

解:

[task setLaunchPath:@"/bin/bash"];
NSArray *args = [NSArray arrayWithObjects:@"-l",@"-c",@"which git",//Assuming git is the launch path you want to run
                 nil];
[task setArguments: args];

但是,这假设用户的shell始终是bash,而其他人则会失败.通过确定shell来解决这个问题.

NSDictionary *environmentDict = [[NSProcessInfo processInfo] environment];
NSString *shellString = [environmentDict objectForKey:@"SHELL"];
原文链接:https://www.f2er.com/c/120200.html

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