- XE7
TMbcsByteType : unsigned char { mbSingleByte, mbLeadByte, mbTrailByte };
TMbcsByteType __fastcall ByteType _DEPRECATED_ATTRIBUTE1("Moved to the AnsiStrings unit") (const System::AnsiString S, int Index)/* overload */; TMbcsByteType __fastcall ByteType(const System::UnicodeString S, int Index)/* overload */;
System.UnicodeString.IsLeadSurrogate
bool IsLeadSurrogate(int index)
Tests whether the element is a lead surrogate.
IsLeadSurrogate returns true if the indexed element is a lead surrogate and false otherwise. Note that index is an element index into the string, not a character or byte index.
System.UnicodeString.IsTrailSurrogate
bool IsTrailSurrogate(int index)
Tests whether the element is a trail surrogate.
IsTrailSurrogate returns True if the indexed element is a trail surrogate and False, otherwise. Note that index is an element index into the string, not a character or byte index.
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c6
IsLeadByte
IsTrailByte
Returns true if the specified byte is a lead byte.
bool __fastcall IsLeadByte(int index) const;
Description
IsLeadByte returns true if the byte indicated by index (counting from 0) is the lead byte in a multi-byte character. If the byte is a trailing byte, or not part of a multi-byte character, IsLeadByte returns false.
Returns true if the specified byte is of type mbTrailByte.
bool __fastcall IsTrailByte(int index) const;
Description
IsTrailByte returns true if the byte indicated by index (counting from 0) is the trailing byte in a multi-byte character. If the byte is a lead byte, or not part of a multi-byte character, IsTrailByte returns false.
System.SysUtils.TMbcsByteType
TMbcsByteType = (mbSingleByte, mbLeadByte, mbTrailByte);
TMbcsByteType represents the use of a single byte in a string that uses a multi-byte character set (MBCS).
TMbcsByteType represents the possible return values of the ByteType and StrByteType functions. Possible values are as follows.
mbSingleByte |
The char is used to represent an entire character in the string. The value of Char cannot be included in the LeadBytes set. |
mbLeadByte |
The char is used to represent the first byte of a multi-byte character. The value of Char must be included in the LeadBytes set. |
mbTrailByte |
The char is used to represent one of the trailing bytes in a multi-byte character. There are no a priori restrictions on the value of char. |
判断是否数字数值
IsDigit
判断是否