MQL4参考标准常量，列举和架构输入/输出常量 代码页使用

Using a Codepage in String Conversion Operations

When converting string variables into arrays of char type and back, the encoding that by default corresponds to the current ANSI of Windows operating system (CP_ACP) is used in MQL4. If you want to specify a different type of encoding, it can be set as additional parameter for the CharArrayToString(), StringToCharArray() and FileOpen() functions.

The table lists the built-in constants for some of the most popular code pages. Not mentioned code pages can be specified by a code corresponding to the page.

Built-in Constants of Codepages

Constant	Value	Description
CP_ACP	0	The current Windows ANSI code page.
CP_OEMCP	1	The current system OEM code page.
CP_MACCP	2	The current system Macintosh code page. Note: This value is mostly used in earlier created program codes and is of no use now, since modern Macintosh computers use Unicode for encoding.
CP_THREAD_ACP	3	The Windows ANSI code page for the current thread.
CP_SYMBOL	42	Symbol code page
CP_UTF7	65000	UTF-7 code page.
CP_UTF8	65001	UTF-8 code page.