NSTask NSPipe - 目标 c 命令行帮助 [英] NSTask NSPipe - objective c command line help

问题描述

这是我的代码:

task = [[NSTask alloc] init];
[task setCurrentDirectoryPath:@"/applications/jarvis/brain/"];
[task setLaunchPath:@"/applications/jarvis/brain/server.sh"];

NSPipe * out = [NSPipe pipe];
[task setStandardOutput:out];

[task launch];
[task waitUntilExit];
[task release];

NSFileHandle * read = [out fileHandleForReading];
NSData * dataRead = [read readDataToEndOfFile];
NSString * stringRead = [[[NSString alloc] initWithData:dataRead encoding:NSUTF8StringEncoding] autorelease];

所以我试图复制这个:

cd /applications/jarvis/brain/
./server.sh

但是在objective-c中使用NSTask.

but using NSTask in objective-c.

但出于某种原因，当我运行此代码时，stringRead 不返回任何内容.当我启动 .sh 文件时，它应该返回终端返回的内容.正确吗?

For some reason though, when I run this code, stringRead, returns nothing. It should return what terminal is returning when I launch the .sh file. Correct?

有什么想法吗?

以利亚

推荐答案

Xcode Bug
在启动使用标准输出的新任务后，Xcode 中有一个错误会阻止它打印任何输出(它收集所有输出，但不再打印任何内容).您将不得不调用 [task setStandardInput:[NSPipe pipe]] 以使其再次显示输出(或者，将任务打印到 stderr 而不是 stdout).

Xcode Bug
There's a bug in Xcode that stops it from printing any output after a a new task using standard output is launched (it collects all output, but no longer prints anything). You're going to have to call [task setStandardInput:[NSPipe pipe]] to get it to show output again (or, alternatively, have the task print to stderr instead of stdout).

对最终代码的建议:

NSTask *server = [NSTask new];
[server setLaunchPath:@"/bin/sh"];
[server setArguments:[NSArray arrayWithObject:@"/path/to/server.sh"]];
[server setCurrentDirectoryPath:@"/path/to/current/directory/"];

NSPipe *outputPipe = [NSPipe pipe];
[server setStandardInput:[NSPipe pipe]];
[server setStandardOutput:outputPipe];

[server launch];
[server waitUntilExit]; // Alternatively, make it asynchronous.
[server release];

NSData *outputData = [[outputPipe fileHandleForReading] readDataToEndOfFile];
NSString *outputString = [[[NSString alloc] initWithData:outputData encoding:NSUTF8StringEncoding] autorelease]; // Autorelease optional, depending on usage.

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