# 这里的用户组和用户ID 用 401，但是实际用时需要根据服务器上的情况来创建
# 我在使用时 401 这个 gid 就已经被占用了，可以使用以下两个命令看看要用的
# ID 是否已经被用了。
sudo dscl . list /Users uid
sudo dscl . list groups gid
 
# 创建用户组 git
sudo dscl . create groups/git
sudo dscl . create groups/git gid 401
 
# 创建用户 git
sudo dscl . create users/git
sudo dscl . create users/git uid 401
sudo dscl . create users/git NFSHomeDirectory /Users/git
sudo dscl . create users/git gid 401
sudo dscl . create users/git UserShell /bin/bash
sudo dscl . create users/git Password '*'
 
# 创建用户主目录，Git 仓库就要放在里面
sudo mkdir /Users/git
sudo chown git /Users/git
sudo chgrp git /Users/git
 
# 下面这一句是把 git 用户添加到可以使用 ssh 访问的用户组里面
# 如果不执行这句的话，git push 或者 git pull 等等的时候会出错
sudo dscl . -append /Groups/com.apple.access_ssh GroupMembership git

@interface NSDate (FormatString)
 
- (NSString*)stringWithFormat:(NSString*)fmt;
+ (NSDate*)dateFromString:(NSString*)str withFormat:(NSString*)fmt;
 
@end
 
@implementation NSDate (FormatString)
 
- (NSString*)stringWithFormat:(NSString*)fmt {
    static NSDateFormatter *fmtter;
 
    if (fmtter == nil) {
        fmtter = [[NSDateFormatter alloc] init];
    }
 
    if (fmt == nil || [fmt isEqualToString:@""]) {
        fmt = @"HH:mm:ss";
    }
 
    [fmtter setDateFormat:fmt];
 
    return [fmtter stringFromDate:self];
}
 
+ (NSDate*)dateFromString:(NSString*)str withFormat:(NSString*)fmt {
    static NSDateFormatter *fmtter;
 
    if (fmtter == nil) {
        fmtter = [[NSDateFormatter alloc] init];
    }
 
    if (fmt == nil || [fmt isEqualToString:@""]) {
        fmt = @"HH:mm:ss";
    }
 
    [fmtter setDateFormat:fmt];
 
    return [fmtter dateFromString:str];
}
 
@end

// 获取当前时间的字符串
NSString *now = [[NSDate date] stringWithFormat:@"HH:mm:ss"];
 
// 将一个字符串解析成 NSDate 对象
NSStirng *recvTime = @"2010-05-25 16:58:34 +0800";
NSDate  *recv = [NSDate dateFromString:recvTime withFormat:@"yyyy-MM-dd HH:mm:ss Z"];

 
- (BOOL)isPartialStringValid:(NSString **)partialStringPtr
       proposedSelectedRange:(NSRangePointer)proposedSelRangePtr
              originalString:(NSString *)origString
       originalSelectedRange:(NSRange)origSelRange
            errorDescription:(NSString **)error 
{
    int size = [*partialStringPtr length];
    if ( size > maxLength ) {
        if (origSelRange.location == [origString length]) {
            // 如果修改的位置在原来字符串的最后，则不做修改，只是拒绝内容修改
        } else {
            // 如果修改的位置在原来字符串的中间，就根据剩余的可用的长度把新增加的字符串进行截取
            int preLen = origSelRange.location + (maxLength - [origString length]) + origSelRange.length;
            *partialStringPtr = [NSString stringWithFormat:@"%@%@",
                                 [*partialStringPtr substringToIndex:preLen],
                                 [origString substringFromIndex:origSelRange.location+origSelRange.length]];
 
            (*proposedSelRangePtr).location = preLen;
        }
 
        return NO;
    }
    return YES;
}

#if TargetCarbon
    soft declare function AEInstallEventHandler Lib CarbonLib ( _
    theAEEventClass as Integer, _
    theAEEventID as Integer, _
    handler as Integer, _
    handlerRefcon as Integer, _
    isSysHandler as Boolean) as Integer
 
    Soft Declare Function NewAEEventHandlerUPP Lib CarbonLib (userRoutine as Ptr) as Integer
 
    Static CallbackUPP as Integer = 0
    If CallbackUPP = 0 then
      dim m as MemoryBlock =  AddressOf ForwardCarbonAEEventToObject
      If m is nil then
        Return
      End if
      CallbackUPP = NewAEEventHandlerUPP(m)
    End if
 
    dim v as Variant = me
 
    dim OSError as Integer = AEInstallEventHandler( _
    OSTypeToUInt(kInternetEventClass), _
    OSTypeToUInt(kAEGetURL), _
    CallbackUPP, _
    v.Hash, false)
 
    msgbox str(OSError)
#endif

// code from ToolbarSearchField by The ZAZ Studios
// http://www.thezaz.com/opensource/realbasic/macosx/searchfield/
static m as new MemoryBlock(4)
m.LittleEndian = false
m.StringValue(0, 4) = s
return m.UInt32Value(0)

soft declare function AEGetParamPtr lib CarbonLib ( _
    theAppleEvent as Integer, theAEKeyword as Integer, _
    desiredType as Integer, byref actualType as Integer, _
    dataPtr as Ptr, maximumSize as Integer, _
    byref actualSize as Integer) as Integer