Mac osx开发
nsopenpanel是什么，为什么要用到这个类, 打开一个选择文件的界面，
NSOpenpanel *openpanel = [NSOpenpanel openpanel];
[openpanel runmodal]; 打开界面
NSUrl *url = openpanel.url. //url the file you choose
task.currenturl = url。//
[task setargument]
[task setlaunchpath]
[task setstandout]
[task launch]
[task waituntilexit]
nsdata *data = [outpipe filehandleforreading] availabledata];
[outpipe filehandleforreading] readinbackgroundnotify];
NSString *str =[ [nsstring alloc] initwithdata:data encoding:nsutf8stringencoding];
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