深入学习System.SysUtils.pas
1、initialization和finalization的写法和其中的内容
initialization
if ModuleIsCpp then HexDisplayPrefix := '0x';
InitMonitorSupport;
{$IFNDEF NEXTGEN}
AddModuleUnloadProc (ModuleUnloaded);
{$ENDIF !NEXTGEN}
{$IF (DEFINED(MSWINDOWS) and DEFINED(NEXTGEN)) or DEFINED(POSIX)}
SafeCallErrorProc := @SafeCallError;
{$ENDIF (MSWINDOWS and NEXTGEN) or POSIX}
{$IFDEF LINUX}
CheckLocale;
{$ENDIF LINUX}
{$IFDEF MSWINDOWS}
InitPlatformIdLock := TObject.Create;
InitDriveSpaceLock := TObject.Create;
GetDiskFreeSpaceEx := @GetDiskFreeSpaceExThunk;
DefaultFallbackLanguages := GetLocaleOverride('');
NTQueryObject := nil;
InternalFormatSettingsLock := TObject.Create;
{$ENDIF MSWINDOWS }
GetFormatSettings ; { Win implementation uses platform id }
finalization
{$IFDEF MSWINDOWS}
InternalFormatSettingsLock. Free ;
InitDriveSpaceLock.Free;
InitPlatformIdLock.Free;
{$ENDIF MSWINDOWS}
{$IFDEF POSIX}
if libuuidHandle <> 0 then
dlclose(libuuid Handle);
{$ENDIF}
{$IFNDEF NEXTGEN}
RemoveModuleUnloadProc (ModuleUnloaded);
ClearHashTables;
{$ENDIF !NEXTGEN}
FreeTerminateProcs ;
DoneMonitorSupport ;
ClearFormatSettings ;
end.
2、
// 求Unicode字符串的字节长度:
function ByteLength (const S: string): Integer; inline;
3、
const
netapi = 'netapi32.dll';
NERR_Success = 0;
//Win32获取当前计算机所加入的工作组(WorkGroup):：
function GetNetWkstaMajorMinor (var MajorVersion, MinorVersion: DWORD): Boolean; //调用下面返回:
function NetWkstaGetInfo100(ServerName: LPWSTR; Level: DWORD; var BufPtr: LPWKSTA_INFO_100): Longint;
4、var HexDisplayPrefix : string = '$'; //16进制默认全局前缀变量
5、{ 多字节字符集的字节类型MultiByte Character Set ( MBCS ) byte type
单字节字符集SBCS }
TMbcsByteType = (mbSingleByte, mbLeadByte, mbTrailByte);
function ByteType (const S: UnicodeString; Index: Integer): TMbcsByteType ; overload;
6、字符串替换工具
type
TReplaceFlags = set of (rfReplaceAll, rfIgnoreCase);
function StringReplace (const Source, OldPattern, NewPattern: string;
Flags: TReplaceFlags): string; overload;
7、字符串文本断词分割符封装工具
{ WrapText will scan a string for BreakChars and insert the BreakStr at the
last BreakChar position before MaxCol. Will not insert a break into an
embedded quoted string (both ''' and '"' supported) }
function WrapText (const Line, BreakStr: string; const BreakChars: TSysCharSet;
MaxCol: Integer): string; overload;
function WrapText (const Line: string; MaxCol: Integer = 45): string; overload;
8、字符串字符分割工具
{ LastDelimiter returns the byte index in S of the rightmost whole
character that matches any character in Delimiters (except null (#0)).
S may contain multibyte characters; Delimiters must contain only single
byte non-null characters.
Example: LastDelimiter('\.:', 'c:\filename.ext') returns 12. }
function LastDelimiter(const Delimiters, S: string): Integer; overload;
{ FindDelimiter returns the index in S of the character that matches any of
the characters in Delimiters (except null (#)). StartIdx specifies the
index in S at which the search for delimiters will start. }
function FindDelimiter(const Delimiters, S: string; StartIdx: Integer = 1): Integer;
{ IsPathDelimiter returns True if the character at byte S[Index]
is a PathDelimiter ('\' or '/'), and it is not a MBCS lead or trail byte. }
function IsPathDelimiter(const S: string; Index: Integer): Boolean; overload;
{ IsDelimiter returns True if the character at byte S[Index] matches any
character in the Delimiters string, and the character is not a MBCS lead or
trail byte. S may contain multibyte characters; Delimiters must contain
only single byte characters. }
function IsDelimiter(const Delimiters, S: string; Index: Integer): Boolean; overload;
9、{ 多字节函数MBCS functions： }
{ ByteType indicates what kind of byte exists at the Index'th byte in S.
Western locales always return mbSingleByte. Far East multibyte locales
may also return mbLeadByte, indicating the byte is the first in a multibyte
character sequence, and mbTrailByte, indicating that the byte is one of
a sequence of bytes following a lead byte. One or more trail bytes can
follow a lead byte, depending on locale charset encoding and OS platform.
Parameters are assumed to be valid. }
{$IFNDEF NEXTGEN}
function ByteType(const S: AnsiString; Index: Integer): TMbcsByteType; overload; deprecated 'Moved to the AnsiStrings unit';
{$ENDIF !NEXTGEN}
function ByteType(const S: UnicodeString; Index: Integer): TMbcsByteType; overload;
{ StrByteType works the same as ByteType, but on null-terminated PChar strings }
{$IFNDEF NEXTGEN}
function StrByteType(Str: PAnsiChar; Index: Cardinal): TMbcsByteType; overload; deprecated 'Moved to the AnsiStrings unit';
{$ENDIF !NEXTGEN}
function StrByteType(Str: PWideChar; Index: Cardinal): TMbcsByteType; overload;
{ ByteToCharLen returns the character length of a MBCS string, scanning the
string for up to MaxLen bytes. In multibyte character sets, the number of
characters in a string may be less than the number of bytes. }
{$IFNDEF NEXTGEN}
function ByteToCharLen(const S: AnsiString; MaxLen: Integer): Integer; overload; inline; deprecated 'Use ElementToCharLen';
{$ENDIF !NEXTGEN}
function ByteToCharLen(const S: UnicodeString; MaxLen: Integer): Integer; overload; inline; deprecated 'Use ElementToCharLen.';
{ CharToByteLen returns the byte length of a MBCS string, scanning the string
for up to MaxLen characters. }
{$IFNDEF NEXTGEN}
function CharToByteLen(const S: AnsiString; MaxLen: Integer): Integer; overload; inline; deprecated 'Use CharToElementLen.';
{$ENDIF !NEXTGEN}
function CharToByteLen(const S: UnicodeString; MaxLen: Integer): Integer; overload; inline; deprecated 'Use CharToElementLen.';
{ ByteToCharIndex returns the 1-based character index of the Index'th byte in
a MBCS string. Returns zero if Index is out of range:
(Index <= 0) or (Index > Length(S)) }
{$IFNDEF NEXTGEN}
function ByteToCharIndex(const S: AnsiString; Index: Integer): Integer; overload; inline; deprecated 'Use ElementToCharIndex.';
{$ENDIF !NEXTGEN}
function ByteToCharIndex(const S: UnicodeString; Index: Integer): Integer; overload; inline; deprecated 'Use ElementToCharIndex.';
{ CharToByteIndex returns the 1-based byte index of the Index'th character
in a MBCS string. Returns zero if Index or Result are out of range:
(Index <= 0) or (Index > Length(S)) or (Result would be > Length(S)) }
{$IFNDEF NEXTGEN}
function CharToByteIndex(const S: AnsiString; Index: Integer): Integer; overload; inline; deprecated 'Use CharToElementIndex.';
{$ENDIF !NEXTGEN}
function CharToByteIndex(const S: UnicodeString; Index: Integer): Integer; overload; inline; deprecated 'Use CharToElementIndex.';
10.1、字符串构建工具 line=3926
// Record and Class for Delphi Native Stringbuilder
type
TCharArray = TArray<Char>;
type
TCharSearch = record
ArrayPtr: PChar;
MatchPtr: PChar;
end;
TStringBuilder = class
Create Append
AppendFormat AppendLine Clear EnsureCapacity Equals Insert
Remove Replace GetEnumerator Capacity
Chars[index: Integer] Length MaxCapacity
10.2、基本数据类型助手 line=3926
TCompareOption = (coLingIgnoreCase, coLingIgnoreDiacritic, coIgnoreCase,
coIgnoreKanatype, coIgnoreNonSpace, coIgnoreSymbols, coIgnoreWidth,
coLingCasing, coDigitAsNumbers, coStringSort);
TCompareOptions = set of TCompareOption;
{$SCOPEDENUMS ON}
TStringSplitOptions = (None, ExcludeEmpty, ExcludeLastEmpty);
{$SCOPEDENUMS OFF}
TStringHelper = record helper for string line=4030
TSingleHelper = record helper for Single line=4081
public
const
Epsilon:Single = 1.4012984643248170709e-45;
MaxValue:Single = 340282346638528859811704183484516925440.0;
MinValue:Single = -340282346638528859811704183484516925440.0;
PositiveInfinity:Single = 1.0 / 0.0;
NegativeInfinity:Single = -1.0 / 0.0;
NaN:Single = 0.0 / 0.0;
TDoubleHelper = record helper for Double line=4245
public
const
Epsilon:Double = 4.9406564584124654418e-324;
MaxValue:Double = 1.7976931348623157081e+308;
MinValue:Double = -1.7976931348623157081e+308;
PositiveInfinity:Double = 1.0 / 0.0;
NegativeInfinity:Double = -1.0 / 0.0;
NaN:Double = 0.0 / 0.0;
TExtendedHelper = record helper for Extended line=4311
public
const
Epsilon:Extended = {$IFDEF EXTENDEDHAS10BYTES} 3.64519953188247460253e-4951 {$ELSE} 4.9406564584124654418e-324 {$ENDIF};
MaxValue:Extended = {$IFDEF EXTENDEDHAS10BYTES} 1.18973149535723176505e+4932 {$ELSE} 1.7976931348623157081e+308 {$ENDIF};
MinValue:Extended = -{$IFDEF EXTENDEDHAS10BYTES} 1.18973149535723176505e+4932 {$ELSE} 1.7976931348623157081e+308 {$ENDIF};
PositiveInfinity:Extended = 1.0 / 0.0;
NegativeInfinity:Extended = -1.0 / 0.0;
NaN:Extended = 0.0 / 0.0;
TByteHelper = record helper for Byte line=4375
public
const
MaxValue = 255;
MinValue = 0;
ToString ToBoolean ToHexString ToHexString(const MinDigits: Integer) ToDouble ToExtended Size
ToString(const Value: Byte) Parse(const S: string): Byte TryParse(const S: string; out Value: Byte): Boolean
TShortIntHelper = record helper for ShortInt line=4395
public
const
MaxValue = 127;
MinValue = -128;
TWordHelper = record helper for Word line=4415
public
const
MaxValue = 65535;
MinValue = 0;
TSmallIntHelper = record helper for SmallInt line=4435
public
const
MaxValue = 32767;
MinValue = -32768;
TCardinalHelper = record helper for Cardinal { for LongWord type too } line=4455
public
const
MaxValue = 4294967295;
MinValue = 0;
ToHexString(const MinDigits: Integer): string ToHexString ......
TIntegerHelper = record helper for Integer { for LongInt type too } line=4475
public
const
MaxValue = 2147483647;
MinValue = -2147483648;
TUInt64Helper = record helper for UInt64 line=4495
public
const
MaxValue = 18446744073709551615;
MinValue = 0;
TInt64Helper = record helper for Int64 line=4515
public
const
MaxValue = 9223372036854775807;
MinValue = -9223372036854775808;
TNativeUIntHelper = record helper for NativeUInt line=4535
public
const
{$IFDEF CPU64BITS}
MaxValue = 18446744073709551615;
{$ELSE !CPU64BITS}
MaxValue = 4294967295;
{$ENDIF CPU64BITS}
MinValue = 0;
TNativeIntHelper = record helper for NativeInt line=4559
public
const
{$IFDEF CPU64BITS}
MaxValue = 9223372036854775807;
MinValue = -9223372036854775808;
{$ELSE !CPU64BITS}
MaxValue = 2147483647;
MinValue = -2147483648;
{$ENDIF CPU64BITS}
TBooleanHelper = record helper for Boolean line=4588
public
function ToInteger: Integer; inline;
function ToString(UseBoolStrs: TUseBoolStrs = TUseBoolStrs.False): string; overload; inline;
class function Size: Integer; inline; static;
class function ToString(const Value: Boolean; UseBoolStrs: TUseBoolStrs = TUseBoolStrs.False): string; overload; inline; static;
class function Parse(const S: string): Boolean; inline; static;
class function TryToParse(const S: string; out Value: Boolean): Boolean; inline; static;
TByteBoolHelper = record helper for ByteBool line=4599
public
function ToInteger: Integer; inline;
function ToString: string; overload; inline;
class function Size: Integer; inline; static;
class function ToString(const Value: Boolean): string; overload; inline; static;
class function Parse(const S: string): Boolean; inline; static;
class function TryToParse(const S: string; out Value: Boolean): Boolean; inline; static;
end;
TWordBoolHelper = record helper for WordBool line=4610
public
TLongBoolHelper = record helper for LongBool line=4621
public
11、控制命令集合：
procedure Sleep(milliseconds: Cardinal);{$IFDEF MSWINDOWS} stdcall; {$ENDIF}
{$IFDEF MSWINDOWS}
(*$EXTERNALSYM Sleep*)
{$ENDIF} //:同步暂停N毫秒
function GetModuleName(Module: HMODULE): string;
function ExceptionErrorMessage(ExceptObject: TObject; ExceptAddr: Pointer;
Buffer: PChar; Size: Integer): Integer;//:返回异常编号
procedure ShowException(ExceptObject: TObject; ExceptAddr: Pointer);//:抛出异常提示！
procedure Abort; //:谢谢哦那个该行中断执行
procedure OutOfMemoryError;
procedure Beep; inline; //:给出Beep响声提示！
12、全局变量（带默认值）：
{ Empty string and null string pointer. These constants are provided for
backwards compatibility only. }
EmptyStr: string = ''; //空白字符串
{$IFNDEF NEXTGEN}
NullStr: PString = @EmptyStr;
EmptyWideStr: WideString = '';//空白字符串
NullWideStr: PWideString = @EmptyWideStr;
EmptyAnsiStr: AnsiString = '';//空白字符串
NullAnsiStr: PAnsiString = @EmptyAnsiStr;
{$ENDIF !NEXTGEN}
未完待续，持续更新中......