我正在尝试写一个isBinary
检查发送行是否包含任何不可打印字符(0-127 范围之外的整数值)的函数:
isBinary := [ :sline |
'Reached isBinary fn.' displayNl.
sline do: [ :char | "for each character"
i := char asInteger. "convert to integer"
(i < 0 | i > 127)
ifTrue: [^true]. ]. "return true if found unprintable"
^false. ]. "if not found above, return false"
(Directory working: '.') allFilesMatching: '*.x'
do: [ :ff |
((ff name), ' : ') display.
infile := FileStream open: ff name mode: FileStream read.
firstline := infile nextLine.
(isBinary value: firstline)
ifTrue: ['Binary file' displayNl.]
ifFalse: [ 'Not a binary file' displayNl].
infile close ].
isBinary
函数已达到,但它给出以下错误(无论文件是否是二进制文件):
$ gst isbinary.st
"Global garbage collection... done"
/home/abcd/binaryfile.x : Reached isBinary fn.
Object: Character value: 16rC0 error: return from a dead method context
SystemExceptions.BadReturn(Exception)>>signal (ExcHandling.st:254)
SystemExceptions.BadReturn class(Exception class)>>signal (ExcHandling.st:151)
Character(Object)>>badReturnError (Object.st:1389)
String(SequenceableCollection)>>do: (SeqCollect.st:827)
[] in UndefinedObject>>executeStatements (isbinary.st:4)
optimized [] in UndefinedObject>>executeStatements (isbinary.st:16)
[] in Kernel.RecursiveFileWrapper(FilePath)>>filesMatching:do: (FilePath.st:903)
[] in Kernel.RecursiveFileWrapper>>namesDo:prefixLength: (VFS.st:378)
[] in File>>namesDo: (File.st:589)
BlockClosure>>ensure: (BlkClosure.st:268)
File>>namesDo: (File.st:586)
Kernel.RecursiveFileWrapper>>namesDo:prefixLength: (VFS.st:373)
[] in Kernel.RecursiveFileWrapper>>namesDo:prefixLength: (VFS.st:382)
[] in File>>namesDo: (File.st:589)
BlockClosure>>ensure: (BlkClosure.st:268)
File>>namesDo: (File.st:586)
Kernel.RecursiveFileWrapper>>namesDo:prefixLength: (VFS.st:373)
Kernel.RecursiveFileWrapper>>namesDo: (VFS.st:396)
Kernel.RecursiveFileWrapper(FilePath)>>filesMatching:do: (FilePath.st:902)
File(FilePath)>>allFilesMatching:do: (FilePath.st:775)
Directory class>>allFilesMatching:do: (Directory.st:225)
UndefinedObject>>executeStatements (isbinary.st:11)
更换sline do:
with sline asArray do:
在我的代码中也不起作用(同样的错误)。
问题出在哪里以及如何解决?感谢您的帮助。
Edit:正如答案和评论中所建议的,我在类中使用方法编写了以下代码,并且该代码有效。我只是想听听您的意见,这是否是正确的方法。
Object subclass: Checker [
isBinary: sline [
'Reached isBinary fn.' displayNl.
sline do: [ :char | | i | "for each character"
i := char asInteger. "convert to integer"
i > 127
ifTrue: [^true] "return true if found unprintable"
].
^false. ] "if no unprintable char found, return false"
].
(Directory working: '.') allFilesMatching: '*.x'
do: [ :ff |
'------------------------------' displayNl.
((ff name), ' : ') displayNl.
infile := FileStream open: ff name mode: FileStream read.
firstline := infile nextLine.
((Checker new) isBinary: firstline)
ifTrue: ['Binary file' displayNl.]
ifFalse: [ 'Not a binary file' displayNl].
infile close ].