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XSharpLoadLibrary Function (RT)

Year Function (RT)

MemAtSpecial Function

Get the location of the first special console character in a buffer.

Namespace: XSharp.RT
Assembly: XSharp.RT (in XSharp.RT.dll) Version: 2.19

Syntax

Copy

 FUNCTION MemAtSpecial(
	ptrBuffer AS IntPtr,
	dwCount AS DWORD
) AS DWORD

public static uint MemAtSpecial(
	IntPtr ptrBuffer,
	uint dwCount
)

Request Example View Source

Parameters

ptrBuffer: Type: IntPtr
A pointer to a buffer.
dwCount: Type: DWord
The number of bytes in ptrBuffer to check.

Return Value

Type: DWord
The location of the first special console character within the specified portion of ptrBuffer.
If a special console character does not exist, MemAtSpecial() returns 0.

Remarks

Special console characters are characters with ASCII values less than or equal to 13, which can require special handling when displayed on the screen. Moreover, a terminal driver can assign special meaning to them, such as ringing the bell when a Chr(7) is specified.

Examples

This example uses MemAtSpecial() iteratively to detect all special console characters in a string:

Copy

 1FUNCTION Start()
 2    LOCAL s := "AB" + _Chr(10) + "CD" + _Chr(7) + ;
 3            "EF" + _Chr(13) + "GH" AS STRING
 4    LOCAL wAt AS DWORD
 5    DO WHILE SLen(s) > 0
 6        wAt := MemAtSpecial(Ptr(_CAST, s), SLen(s))
 7        IF wAt > 0
 8            ? "Special char with ASCII code of:",;
 9                Asc(Substr3(s, wAt, 1)), "was detected"
10            // Query the rest of the string
11            // (from wAt+1 and on)
12            s := Substr(s, wAt+1)
13        ELSE
14            s := ""
15        ENDIF
16    ENDDO

Reference

Functions, Globals and Defines

XSharp.RT Namespace

MemChr(IntPtr, Byte, DWord)