CVCode uses a code table control to achieve a simple transformation, and today there is still its practical meaning today. More common applications are, there are Taiwan employees in the enterprise, and there are mainland employees, and the Simplified and Traditional OS are used, so how to ensure GB2312, GBK and BIG5 in the MIS system can be used normally, and the data entered by BIG5 is The GBK system should be displayed properly and can match the characters entered in GB2312 (in the query, query is the most common). In response to this application, CVCode provides a code table control method. In theory, as long as it defines a code table, you can really let BIG5 and GB2312 "interoperability"
But in CVCode, just GB2312 and BIG5 conversion, today in the GBK input method, GB2312 is obviously not enough. And the BIG5 character set is much greater than GB2312, so extending CVCODE makes it a must-have GBK and BIG5 conversion function.
The character range of GBK is as follows:
GBK character set range
Partition high low position <
----------------------------------------------
● GBK / 1: GB2312 non-Chinese characters: A1 ~ A9 || A1 ~ Fe
● GBK / 2: GB2312 Chinese characters: B0 ~ F7 || A1 ~ Fe
● GBK / 3: Expansion Chinese characters: 81 ~ A0 || 40 ~ Fe
● GBK / 4: Expansion Chinese characters: aa ~ fe || 40 ~ A0
● GBK / 5: Expansion non-Chinese characters: A8 ~ A9 || 40 ~ A0
1 and 2 are corresponding GB2312 character sets.
How to let CVCode support GBK, 3 issues: 1. Judgment whether the GB code 2. Calculate the character sequence 3. Compatible with the original code table
The first question is to modify the ISGB as follows:
Function isgb (Value: string): boolean;
VAR
MHigh, Mlow: Integer;
Begin
IF (Length> = 2) THEN
Begin
MHigh: = ORD (Value [1]);
mlow: = ORD (Value [2]);
Result: = FALSE;
// ● GBK / 1: GB2312 non-Chinese characters: A1 ~ A9 || A1 ~ Fe
IF (MHigh in [$ A1 .. $ f])..
// ● GBK / 2: GB2312 Chinese characters: B0 ~ F7 || A1 ~ Fe
IF (Mhigh in [$ A1 .. $ Fe]) The Result: = true
// ● GBK / 3: Expansion Chinese characters: 81 ~ A0 || 40 ~ Fe
IF (MiGH IN [$ 81 .. $ f]).
// ● GBK / 4: Expand Chinese character: aa ~ fe || 40 ~ A0
IF (MHigh In [$ 40 .. $ a0]).
// ● GBK / 5: Expansion non-Chinese characters: A8 ~ A9 || 40 ~ A0
IF (MHigh in [$ A8 .. $ A9) and (Mlow IN [$ 40 .. $ a0]) THEN RESULT: = True;
end
Else
RESULT: = TRUE;
{// This is the original, only based on GB2312 as a basis
IF (Length> = 2) thenbegin
IF (Value [1] <= # 161) and (value [1]> = # 247) THEN
Result: = FALSE
Else
IF (Value [2] <= # 161) and (value [2]> = # 254) THEN
Result: = FALSE
Else
Result: = TRUE
end
Else
RESULT: = TRUE;
}
END;
The second compatibility is compatible with the original code table - actually compatible is mainly in the order:
Function GBOFFSET (Value: String): Integer;
VAR
MHigh, Mlow: Integer;
MGBK1, MGBK2, MGBK3, MGBK4, MGBK5: Integer
Begin
{// This is the original ---
if Length> = 2 THEN
Result: = (Value [1]) - $ A1) * $ 5e (ORD (Value [2]) - $ A1)
Else
RESULT: = -1;
}
RESULT: = -1;
if Length> = 2 THEN
Begin
MHigh: = ORD (Value [1]);
mlow: = ORD (Value [2]);
// How many Chinese characters have each zone?
// mgbk1: = ($ A9 - $ A1 1) * ($ Fe - $ A1 1); // = 846 = $ 34e
// MGBK2: = ($ F7 - $ B0 1) * ($ Fe - $ A1 1); // = 6768 = $ 1A70
// mgbk3: = ($ A0 - $ 81 1) * ($ Fe - $ 40 1);
// MGBK4: = ($ Fe - $ AA 1) * ($ A0 - $ 40 1);
// mgbk5: = ($ A9 - $ A8 1) * ($ A0 - $ 40 1);
MGBK1: = $ 34E; // 846
MGBK1: = MGBK1 ($ B0 - $ A9-1) * ($ FE - $ A1 1); // This is to compatible with the previous code table
MGBK2: = $ 1A70; // 6768
MGBK3: = $ 17E0; // 6112
MGBK4: = $ 2035; // 8245
MGBK5: = $ C2; // 194
// ● GBK / 1: GB2312 non-Chinese characters: A1 ~ A9 || A1 ~ Fe
IF (MHigh in [$ a1 .. $ a9]) and (mlow IN [$ a1 .. $ f]).
Result: = (MHigh - $ A1) * ($ Fe - $ A1 1) (MLOW - $ A1)
// ● GBK / 2: GB2312 Chinese characters: B0 ~ F7 || A1 ~ Fe
Else IF (MHigh in [$ A1 .. $ f])......................................................................................................................................................................................................................................................
Result: = mgbk1
(MHigh - $ b0) * ($ Fe - $ A1 1) (MLOW - $ A1)
// ● GBK / 3: Expansion Chinese characters: 81 ~ A0 || 40 ~ Fe
Else IF (MHigh in [$ 40 .. $ f]) THEN
Result: = MGBK1 MGBK2 (MHigh - $ 81) * ($ Fe - $ 40 1) (MLOW - $ 40)
// ● GBK / 4: Expand Chinese character: aa ~ fe || 40 ~ A0
Else IF (MHigh in [$ 40 .. $ a0]).
Result: = MgBK1 MGBK2 MGBK3
(MHigh - $ AA) * ($ A0 - $ 40 1) (MLOW - $ 40)
// ● GBK / 5: Expansion non-Chinese characters: A8 ~ A9 || 40 ~ A0
Else if ($ A8 .. $ A9]) And (Mlow IN [$ 40 .. $ a0]).
Result: = MgBK1 MGBK2 MGBK3 MGBK4
(MHigh - $ A8) * ($ A0 - $ 40 1) (MLOW - $ 40);
end
END;
