_C2Hex Function (Core)

_DebOut32 Function (Core)

_GetCmdLine Function (Core)

_GetCmdShow Function (Core)

_GetInst Function (Core)

_GetPrevInst Function (Core)

_Like Function (Core)

_Quit Function (Core)

_SplitPath Function (Core)

_Val Function (Core)

AbsInt Function (Core)

AbsLong Function (Core)

AbsReal4 Function (Core)

AbsReal8 Function (Core)

AbsShort Function (Core)

AdjustFName Function (Core)

AdjustFNameA Function (Core)

AllTrim Function (Core)

AltD Function (Core)

AmPm Function (Core)

Ansi2Oem Function (Core)

Ansi2OemA Function (Core)

Ansi2OemBuff Function (Core)

ATCLine Function (Core)

ATCLine2 Function (Core)

ATLine Function (Core)

ATLine2 Function (Core)

B64EncFile Function (Core)

B64EncString Function (Core)

Bin2DW Function (Core)

Bin2I Function (Core)

Bin2L Function (Core)

Bin2Logic Function (Core)

Bin2Ptr Function (Core)

Bin2Real4 Function (Core)

Bin2Real8 Function (Core)

Bin2W Function (Core)

Buffer Function (Core)

C2Hex Function (Core)

CharEven Function (Core)

CharMix Function (Core)

CharOdd Function (Core)

CharPos Function (Core)

Chr Function (Core)

ChrA Function (Core)

ChrW Function (Core)

ConDateTime Function (Core)

ConTime Function (Core)

CToDt Function (Core)

CToDtAnsi Function (Core)

CTOL Function (Core)

CurDir Function (Core)

CurDrive Function (Core)

DateTime Function (Core)

Days Function (Core)

DbRegisterClient Function (Core)

DbUnRegisterClient Function (Core)

DebOut32 Function (Core)

DecodeBase64 Function (Core)

DirChange Function (Core)

DirMake Function (Core)

DirRemove Function (Core)

DiskChange Function (Core)

DiskFree Function (Core)

DiskName Function (Core)

DiskSpace Function (Core)

DosError Function (Core)

DosErrString Function (Core)

DtToC Function (Core)

DtToS Function (Core)

DW2Bin Function (Core)

ElapTime Function (Core)

EncodeBase64 Function (Core)

ErrorBuild Function (Core)

ErrorLevel Function (Core)

ErrorStack Function (Core)

ErrString Function (Core)

ExecName Function (Core)

FAttr2String Function (Core)

FAttrib Function (Core)

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FConvertToFileStream Function (Core)

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FCopy Function (Core)

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FDate Function (Core)

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FGetBuffer Function (Core)

FGetFileName Function (Core)

FGetS Function (Core)

FGetS2 Function (Core)

FGetStream Function (Core)

File Function (Core)

FName Function (Core)

FNext Function (Core)

FOpen Function (Core)

FOpen2 Function (Core)

FPathName Function (Core)

FPutS Function (Core)

FPutS3 Function (Core)

FRead Function (Core)

FRead3 Function (Core)

FRead4 Function (Core)

FReadLine Function (Core)

FReadLine2 Function (Core)

FReadStr Function (Core)

FReadText Function (Core)

FReadText3 Function (Core)

FRename Function (Core)

FRewind Function (Core)

FSeek3 Function (Core)

FSize Function (Core)

FTell Function (Core)

FTell64 Function (Core)

FTime Function (Core)

FWrite Function (Core)

FWrite3 Function (Core)

FWrite4 Function (Core)

FWriteLine Function (Core)

FWriteLine3 Function (Core)

FWriteText3 Function (Core)

GetAMExt Function (Core)

GetAmPm Function (Core)

GetAnsi Function (Core)

GetChunkBase64 Function (Core)

GetCurPath Function (Core)

GetCursorProperty Function (Core)

GetDateFormat Function (Core)

GetDefault Function (Core)

GetDefaultDir Function (Core)

GetDosError Function (Core)

GetEnv Function (Core)

GetFAttr Function (Core)

GetFMask Function (Core)

GetMacroCompiler Function (Core)

GetMimType Function (Core)

GetNatDLL Function (Core)

GetPartialEnumName Function (Core)

GetPMExt Function (Core)

GetSQLProperty Function (Core)

GetTimeSep Function (Core)

GetTimeZoneDiff Function (Core)

GetYield Function (Core)

HardCR Function (Core)

Hex2C Function (Core)

HiByte Function (Core)

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I2Bin Function (Core)

Instr Function (Core)

IsAlNum Function (Core)

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MakeDWord Function (Core)

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MakeWord Function (Core)

MemLines Function (Core)

MemoLine Function (Core)

MemoRead Function (Core)

MemoReadBinary Function (Core)

MemoWrit Function (Core)

MemoWritBinary Function (Core)

MLCount1 Function (Core)

MLcToPos Function (Core)

MLine Function (Core)

MLine3 Function (Core)

MLPos2 Function (Core)

Mod Function (Core)

ModuleName Function (Core)

NetErr Function (Core)

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NToCDoW Function (Core)

NToCMonth Function (Core)

Occurs Function (Core)

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Occurs3 Function (Core)

Oem2Ansi Function (Core)

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Oem2AnsiBuff Function (Core)

OS Function (Core)

ProcFile Function (Core)

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ProcName Function (Core)

Proper Function (Core)

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Ptr2Bin Function (Core)

QPEncString Function (Core)

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RAt2 Function (Core)

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RAtLine Function (Core)

RATLine2 Function (Core)

ReadOsVersionFromRegistry Function (Core)

Real42Bin Function (Core)

Real82Bin Function (Core)

RegisterFileSearch Function (Core)

Repl Function (Core)

Replicate Function (Core)

RGB Function (Core)

Right Function (Core)

RTrim Function (Core)

SClone Function (Core)

Seconds Function (Core)

Secs Function (Core)

SetAMExt Function (Core)

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SetAnsi Function (Core)

SetBeep Function (Core)

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SetCpu Function (Core)

SetDateCountry Function (Core)

SetDateFormat Function (Core)

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SetDecimalSep Function (Core)

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SetNatDLL Function (Core)

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SetPathArray Function (Core)

SetPMExt Function (Core)

SetRefresh Function (Core)

SetSafety Function (Core)

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SetSoftSeek Function (Core)

SetSpace Function (Core)

SetThousandSep Function (Core)

SetTimeFormat Function (Core)

SetTimeSep Function (Core)

SetUnique Function (Core)

SetYield Function (Core)

SLen Function (Core)

SoundEx Function (Core)

Space Function (Core)

SToDt Function (Core)

String2FAttr Function (Core)

Stuff Function (Core)

SubStr2 Function (Core)

SubStr3 Function (Core)

SwapByte Function (Core)

SwapDWord Function (Core)

SwapInt Function (Core)

SwapInt64 Function (Core)

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SwapQWord Function (Core)

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SystemTypeToUsualType Function (Core)

Time Function (Core)

Time24 Function (Core)

Trim Function (Core)

TruePath Function (Core)

TString Function (Core)

TypeString Function (Core)

Upper Function (Core)

UpperA Function (Core)

UseBufferedFileStream Function (Core)

UUDecodeLine Function (Core)

UUEncFile Function (Core)

UUEncLine Function (Core)

W2Bin Function (Core)

WorkDir Function (Core)

FReadLine Function

Read a line from an open file.

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

Syntax

Copy

 FUNCTION FReadLine(
	ptrHandle AS IntPtr,
	nMax AS DWORD
) AS STRING

public static string FReadLine(
	IntPtr ptrHandle,
	uint nMax
)

Request Example View Source

Parameters

ptrHandle: Type: IntPtr
The handle of the file to read from.
nMax: Type: DWord
The maximum number of characters to read per line. FReadLine() will read until a hard carriage return (Chr(13)) is reached, end-of-file is encountered, or nMax characters are read.
The default value for nMax is 256.

Return Value

Type: String
The line read. When the end-of-file is reached, FReadLine() returns a NULL_STRING and FError() is set to 257.

Remarks

This function is the same as FGets(). Both functions are assumed to handle raw binary data and are not dependent upon the status of SetAnsi(). FReadText() and FRead4(), on the other hand, are dependent upon SetAnsi().

Remarks

Tip
The low level File IO functions in the X# runtime are using .Net filestreams in the background. That means that the file handles returned by FOpen() and FCreate() are not 'normal' file handles, but unique identifiers that are used to find the underlying stream object in a collection of streams in the runtime. That also means that you can't use file handles for functions such as FRead() and FWrite() that were not created in the X# runtime. If you want to access the underlying FileStream, then you should call the function FGetStream(IntPtr)

Tip

The low level File IO functions in the X# runtime are using .Net filestreams in the background.
That means that the file handles returned by FOpen() and FCreate() are not 'normal' file handles, but unique identifiers that are used to find the underlying stream object in a collection of streams in the runtime.
That also means that you can't use file handles for functions such as FRead() and FWrite() that were not created in the X# runtime.
If you want to access the underlying FileStream, then you should call the function FGetStream(IntPtr)

Examples

This example uses FReadLine() to read an entire file without specifying a value for nMax:

Copy

1ptrHandle := FOpen2("docs.txt", FO_READ)
2IF ptrHandle != F_ERROR
3    DO WHILE !FEOF(ptrHandle)
4        ? FReadLine(ptrHandle)
5    ENDDO
6ENDIF
7FClose(ptrHandle)

The following example provides a utility that displays and counts all occurrences of a string within a file:

Copy

 1FUNCTION Grep(cSearch, cFile AS STRING) ;
 2        AS DWORD PASCAL
 3    LOCAL handle AS PTR
 4    LOCAL Count AS DWORD
 5    LOCAL Line AS STRING
 6    Line := " "
 7    handle := FOpen2(file, FO_READ)
 8    cSearch := Upper(cSearch)
 9    DO WHILE !FEOF(handle)
10        line := Upper(FReadLine(handle))
11        IF InStr(cSearch, line)
12            ? line
13        Count += 1
14        ENDIF
15    ENDDO
16    RETURN Count

Reference

Functions, Globals and Defines

XSharp.Core Namespace

FGets

FReadLine2(IntPtr, DWord)