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XSharpLoadLibrary Function (RT)

Year Function (RT)

FWrite Function

Write a string to an open file.

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

Syntax

Copy

 FUNCTION FWrite(
	ptrHandle,
	cBuffer,
	nBytes
) AS DWORD CLIPPER

[ClipperCallingConventionAttribute(new string[] { ... })]
public static uint FWrite(
	Usual ptrHandle = default,
	Usual cBuffer = default,
	Usual nBytes = default
)

Request Example View Source

Parameters

ptrHandle (Optional): Type: Usual
The handle of the file to write to.
cBuffer (Optional): Type: Usual
The string to write.
nBytes (Optional): Type: Usual
The number of bytes in cBuffer to write, beginning at the current file pointer position.
If omitted, the entire contents of cBuffer is written.

Return Value

Type: DWord
The number of bytes written.
If the value returned is equal to nBytes, the operation was successful.
If the return value is less than nBytes or 0, this means that the length of cBuffer is less than nBytes, or the disk is full, or another error has occurred. FError() can be used to determine the specific error. When a disk full error occurs, FError() is set to 256. FWrite() and FWrite3 are assumed to handle raw binary data and are not dependent upon the status of SetAnsi(). FWriteText() and FWrite4(), on the other hand, are dependent upon SetAnsi().

Remarks

Tip
This function is included for compatibility. We do not recomment using static memory for file i/o operations. We recommend that you use the function overload that takes a byte array parameter in stead.

Examples

This example copies the contents of one file to another:

Copy

 1DEFINE F_BLOCK := 512
 2...
 3cBuffer := Space(F_BLOCK)
 4nInfile := FOpen2("temp.txt", FO_READ)
 5nOutfile := FCreate("newfile.txt", FC_NORMAL)
 6lDone := FALSE
 7DO WHILE !lDone
 8    nBytesRead := FRead(nInfile, @cBuffer,;
 9    F_BLOCK)
10    IF FWrite(nOutfile, cBuffer) < SLen(cBuffer)
11        ? DOSErrString(FError())
12        lDone := TRUE
13    ELSE
14        lDone := (nBytesRead = 0)
15    ENDIF
16ENDDO
17FClose(nInfile)
18FClose(nOutfile)

Reference

Functions, Globals and Defines

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