如何解决读取超过 2GB 的大文本文件时缓冲区溢出的问题？

发布于 2024-10-28 08:27:32 字数 443 浏览 1 评论 0原文

我试图在 JScript 中读取一个大文本文件来搜索字符串，但遇到溢出异常。我写了下面的代码。

var ForReading = 1;
var TriStateFalse = 0;
var strFileData;

var fso, objFile, objTS;
fso = new ActiveXObject("Scripting.FileSystemObject");
objFile = fso.GetFile("Sample2GBFile");

strFileData = objTS.Read(objFile.Size);
if(strFileData .indexOf("String to search") > 0 )
{
wShShell.Echo("Found...");
}

在上面的代码中，我遇到了缓冲区溢出，因为 2GB 文件无法放入缓冲区。请帮助如何解决这个问题。

原文

I am trying to read a large text file in JScript to search for a string, but encountering overflow exception. I wrote the following code.

var ForReading = 1;
var TriStateFalse = 0;
var strFileData;

var fso, objFile, objTS;
fso = new ActiveXObject("Scripting.FileSystemObject");
objFile = fso.GetFile("Sample2GBFile");

strFileData = objTS.Read(objFile.Size);
if(strFileData .indexOf("String to search") > 0 )
{
wShShell.Echo("Found...");
}

In the above code, I am getting the buffer overflow as the 2GB file is unable to fit into the buffer. pls help how to resolve this.

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情愿 2024-11-04 08:27:32

读取文件的较小部分，检查字符串、空缓冲区，然后读取更多内容。只需确保在读取块时考虑到字符串的长度，以防止切割它并因此错过命中。

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小女人ら 2024-11-04 08:27:32

循环一行而不是读取整个文件

http://techsupt.winbatch.com/ts/T000001033F64 .html

:test4
; read single chars from a line, count chars.
testfile = "d:\temp\test.ascii.txt"
MyFile = fso.OpenTextFile(testfile, ForReading)       ; Open a file as a TextStream
ThisLine = ""
While !MyFile.AtEndOfLine                             ; Is the current position at the end of a line? 
   ThisColumnCount = MyFile.Column                    ; Current column number.
   ThisLine        = StrCat(ThisLine, MyFile.Read(1)) ; Read a specific number of characters into a string.
   NextColumnCount = MyFile.Column                    ; Current column number.
EndWhile
MyFile.Close                                          ; Close a text stream.
ObjectClose(MyFile)

:test5
; read lines, count lines.
testfile = "d:\temp\test.ascii.txt"
MyFile = fso.OpenTextFile(testfile, ForReading)       ; Open a file as a TextStream
While !MyFile.AtEndOfStream                           ; Is the current position at the end of the stream?
   ThisLineCount = MyFile.Line                        ; Current line number.
   ThisLine      = MyFile.ReadLine                    ; Read an entire line into a string.
   NextLineCount = MyFile.Line                        ; Current line number.
EndWhile
MyFile.Close                                          ; Close a text stream.
ObjectClose(MyFile)

Loop over a line instead of reading the whole file

http://techsupt.winbatch.com/ts/T000001033F64.html

:test4
; read single chars from a line, count chars.
testfile = "d:\temp\test.ascii.txt"
MyFile = fso.OpenTextFile(testfile, ForReading)       ; Open a file as a TextStream
ThisLine = ""
While !MyFile.AtEndOfLine                             ; Is the current position at the end of a line? 
   ThisColumnCount = MyFile.Column                    ; Current column number.
   ThisLine        = StrCat(ThisLine, MyFile.Read(1)) ; Read a specific number of characters into a string.
   NextColumnCount = MyFile.Column                    ; Current column number.
EndWhile
MyFile.Close                                          ; Close a text stream.
ObjectClose(MyFile)

:test5
; read lines, count lines.
testfile = "d:\temp\test.ascii.txt"
MyFile = fso.OpenTextFile(testfile, ForReading)       ; Open a file as a TextStream
While !MyFile.AtEndOfStream                           ; Is the current position at the end of the stream?
   ThisLineCount = MyFile.Line                        ; Current line number.
   ThisLine      = MyFile.ReadLine                    ; Read an entire line into a string.
   NextLineCount = MyFile.Line                        ; Current line number.
EndWhile
MyFile.Close                                          ; Close a text stream.
ObjectClose(MyFile)

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~没有更多了~