问题描述
我有NSTask运行一个长预处理shell脚本，我想让NSProgressIndicator检查做了多少。我试过很多东西，但似乎不能让它工作。
What I have is NSTask running a long premade shell script and I want the NSProgressIndicator to check on how much is done. I've tried many things but just can't seem to get it to work. I know how to use it if the progress bar is indeterminate but i want it to load as the task goes on.
下面是我运行脚本的方法：
Here is how I am running the script:
- (IBAction)pressButton:(id)sender {
NSTask *task = [[NSTask alloc] init];
[task setLaunchPath:@"/bin/sh"];
[task setArguments:[NSArray arrayWithObjects:[[NSBundle mainBundle] pathForResource:@"script" ofType:@"sh"], nil]];
[task launch];
}
我需要放置一个进度条来检查任务的进度
I need to put a progress bar in that checks the progress of that task while it happens and update accordingly.
推荐答案
这是一个运行unix脚本的异步NSTask的示例。在Unix脚本中有 echo 命令将当前状态发送回标准错误，如下所示：
Here is an example of an async NSTask running a unix script. Within the Unix script there are echo commands that send back the current status to standard error like this:
echoworking>& 2
这由通知中心处理并发送到显示器。
This is processed by notification center and sent to the display.
要更新确定的进度条，只需发送状态更新，例如25.026.0，然后转换为float并发送到进度条。
To update a determinate progress bar just send status updates like "25.0" "26.0" and convert to float and send to the progress bar.
注意：我经过多次实验，并通过使用本网站的许多提示和其他参考文件工作。所以我希望这对你有帮助。
note: I got this working after alot of experimenting and by using many tips from this site and other references. so I hope it is helpful to you.
这里是声明：
NSTask *unixTask;
NSPipe *unixStandardOutputPipe;
NSPipe *unixStandardErrorPipe;
NSPipe *unixStandardInputPipe;
NSFileHandle *fhOutput;
NSFileHandle *fhError;
NSData *standardOutputData;
NSData *standardErrorData;
以下是主程序模块：
- (IBAction)buttonLaunchProgram:(id)sender {
[_unixTaskStdOutput setString:@"" ];
[_unixProgressUpdate setStringValue:@""];
[_unixProgressBar startAnimation:sender];
[self runCommand];
}
- (void)runCommand {
//setup system pipes and filehandles to process output data
unixStandardOutputPipe = [[NSPipe alloc] init];
unixStandardErrorPipe = [[NSPipe alloc] init];
fhOutput = [unixStandardOutputPipe fileHandleForReading];
fhError = [unixStandardErrorPipe fileHandleForReading];
//setup notification alerts
NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];
[nc addObserver:self selector:@selector(notifiedForStdOutput:) name:NSFileHandleReadCompletionNotification object:fhOutput];
[nc addObserver:self selector:@selector(notifiedForStdError:) name:NSFileHandleReadCompletionNotification object:fhError];
[nc addObserver:self selector:@selector(notifiedForComplete:) name:NSTaskDidTerminateNotification object:unixTask];
NSMutableArray *commandLine = [NSMutableArray new];
[commandLine addObject:@"-c"];
[commandLine addObject:@"/usr/bin/kpu -ca"]; //put your script here
unixTask = [[NSTask alloc] init];
[unixTask setLaunchPath:@"/bin/bash"];
[unixTask setArguments:commandLine];
[unixTask setStandardOutput:unixStandardOutputPipe];
[unixTask setStandardError:unixStandardErrorPipe];
[unixTask setStandardInput:[NSPipe pipe]];
[unixTask launch];
//note we are calling the file handle not the pipe
[fhOutput readInBackgroundAndNotify];
[fhError readInBackgroundAndNotify];
}
-(void) notifiedForStdOutput: (NSNotification *)notified
{
NSData * data = [[notified userInfo] valueForKey:NSFileHandleNotificationDataItem];
NSLog(@"standard data ready %ld bytes",data.length);
if ([data length]){
NSString * outputString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
NSTextStorage *ts = [_unixTaskStdOutput textStorage];
[ts replaceCharactersInRange:NSMakeRange([ts length], 0)
withString:outputString];
}
if (unixTask != nil) {
[fhOutput readInBackgroundAndNotify];
}
}
-(void) notifiedForStdError: (NSNotification *)notified
{
NSData * data = [[notified userInfo] valueForKey:NSFileHandleNotificationDataItem];
NSLog(@"standard error ready %ld bytes",data.length);
if ([data length]) {
NSString * outputString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
[_unixProgressUpdate setStringValue:outputString];
}
if (unixTask != nil) {
[fhError readInBackgroundAndNotify];
}
}
-(void) notifiedForComplete:(NSNotification *)anotification {
NSLog(@"task completed or was stopped with exit code %d",[unixTask terminationStatus]);
unixTask = nil;
[_unixProgressBar stopAnimation:self];
[_unixProgressBar viewDidHide];
if ([unixTask terminationStatus] == 0) {
[_unixProgressUpdate setStringValue:@"Success"];
}
else {
[_unixProgressUpdate setStringValue:@"Terminated with non-zero exit code"];
}
}
@end
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