只是想知道,我如何检查特定文件夹是否正在保存文件,并将文件夹中的文件名实例化为NSStrings？我知道一个名为NSFileManager的类,但我不确定如何应用它来满足我的目标.
我在目标c中写一个应用程序.我知道当iPhone与Library/Logs/CrashReporter/MobileDevice /(iPhone主机名)中的Xcode Organizer同步时,.crash和.plist文件(核心转储文件)是可见的.但是,我的应用程序要求我能够查看Iphone本身的文件.有谁知道这些文件所在的确切文件夹？
很感谢任何形式的帮助!
假设我有一个文件BookDB.txt,它以下列格式存储数据:
Harry Potter - The Half Blood Prince:J.K Rowling:40.30:10:50
The little Red Riding Hood:Dan Lin:40.80:20:10
Harry Potter - The Phoniex:J.K Rowling:50.00:30:20
Harry Potter - The Deathly Hollow:Dan Lin:55.00:33:790
Little Prince:The Prince:15.00:188:9
Lord of The Ring:Johnny Dept:56.80:100:38
Three Little Pig:Andrew Lim:89.10:290:189
All About Linux:Ubuntu Team:76.00:44:144
Catch Me If You Can:Mary Ann:23.60:6:2
Python for dummies:Jared Loo:15.99:1:10
我想在输出中用(,)替换(:)分隔符.它成功,但从输出中删除换行符.这是我的代码:
TITLE=Potter
OUTPUT=$(cat BookDB.txt | grep $TITLE)
OUTPUT1=$(sed 's/:/, /g' <<< $OUTPUT)
echo $OUTPUT1
我希望我的输出看起来像这样:
Harry Potter - The Half Blood Prince, J.K Rowling, 40.30, 10, …我有一个文件BookDB.txt,它以下列方式存储信息:
C++ for dummies:Jared:10.67:4:5
Java for dummies:David:10.45:3:6
PHP for dummies:Sarah:10.47:2:7
假设在运行时期间,scipt会询问用户他想要删除的标题.然后将其存储在TITLE变量中.然后如何删除包含相关字符串的行？我尝试了以下命令,但无济于事:
sed '/$TITLE/' BookDB.txt >> /dev/null
我想知道是否有可能根据其中包含的数值对NSStrings的NSArray进行排序.基本上它是进程ID和进程名称的列表,我想根据进程ID对进程进行排序.该数组如下所示:
"286 Google Chrome He",
"1209 ibtool",
"0 kernel_task",
"1 launchd",
"10 kextd",
"11 notifyd",
"12 diskarbitrationd",
"13 configd",
"14 syslogd",
"15 DirectoryService",
"16 distnoted",
"18 ntpd",
"22 SystemStarter",
"25 securityd",
"28 mds",
"29 mDNSResponder",
"30 loginwindow",
"31 KernelEventAgent",
"33 hidd",
"34 fseventsd",
"36 dynamic_pager",
"42 blued",
"43 autofsd",
"46 WDSmartWareD",
"47 WDDMService",
"61 coreservicesd",
"62 WindowServer",
"71 HWPortCfg",
"72 HWNetCfg",
"159 socketfilterfw",
"165 cvmsServ",
"177 coreaudiod",
"191 vmnet-bridge",
"196 vmnet-dhcpd",
"198 vmnet-netifup",
"200 vmnet-dhcpd",
"204 vmnet-natd",
"206 vmnet-netifup",
"220 …我有一个文件以下列格式存储数据(这只是一个小样本):
AD,Andorra,AN,AD,AND,20.00,Andorra la Vella,Europe,Euro,EUR,67627.00
AE,United Arab Emirates,AE,AE,ARE,784.00,Abu Dhabi,Middle East,UAE Dirham,AED,2407460.00
AF,Afghanistan,AF,AF,AFG,4.00,Kabul,Asia,Afghani,AFA,26813057.00
AG,Antigua and Barbuda,AC,AG,ATG,28.00,Saint John's,Central America and the Caribbean,East Caribbean Dollar,XCD,66970.00
AI,Anguilla,AV,AI,AIA,660.00,The Valley,Central America and the Caribbean,East Caribbean Dollar,XCD,12132.00
我想存储每行的第二个字段,以便我的数组只包含国家名称,如下所示:
string countryArray[] = {"Andorra,United Arab Emirates", "Afghanistan", "Antigua and Barbuda", "Anguilla"}
但每次运行我的代码时,都会发生分段错误.这是我的代码:
countryArray[256];
if (myfile)
{
while (getline(myfile,line))
{
std::string s = line;
std::string delimiter = ",";
size_t pos = 0;
std::string token;
short loop=0;
while ((pos = s.find(delimiter)) != std::string::npos)
{
token = s.substr(0, pos);
s.erase(0, pos + delimiter.length()); …