您正在检查$dir是否为非空，因此与您尝试实现的相反。请使用-z（或!-s）代替。
NO_OUTPUT int delete_file(char *name) POSTCALL: if (RETVAL != 0) croak("Error %d while deleting file '%s'", RETVAL, name); 上述代码在Perl中的表现是,成功的时候不会有值返回,但在失败的时候会die。这种风格是贴近Perl风格的,即把一个带有返回值的C函数,改为一个没有返回值但会抛出异常的Perl...
问将xls转换为xlsx的Perl脚本正在生成空白xlsx和错误消息。EN执行下面的perl脚本将xls转换为xlsx，但是它...
$string="This,is,a,csv,file";@array=split(/,/,$string);# split the string by comma using regular expressionprint“@array”;# prints This is a csv file$string=“Helloworld”;@array=split(//,$string);# split the string by each character using empty patternprint“@array”;# prints H ...
Usage: perl perlpp.pl [options] [filename] Options: -o, --output filename Output to the file instead of STDOUT. -D, --define name=value Set $D{name}=value in the generated code. The hash %D always exists, but is empty if you haven't specified any -D options. Also substitutes ...
Strawberry Perlis a perl environment for MS Windows containing all you need to run and develop perl applications. It is designed to be as close as possible to perl environment on UNIX systems. It includes perl binaries, compiler (gcc) + related tools, all the external libraries (crypto, math...
(An empty line cannot contain any spaces or tabs.) You may set it to a multi-character string to match a multi-character terminator, or to "undef" to read through the end of file. Setting it to "\n\n" means something slightly different than setting to "", if the file contains ...
necessary to do this. Whether a scalar behaves like a number or a string depends on the operator with which it is used. When used as a string, a scalar will behave like a string. When used as a number, a scalar will behave like a number (raising a warning if this isn't possible)...
(The fact that a Perl interpreter and your code are in the same binary file is, in this case, a form of mere aggregation.) This is my interpretation of the GPL. If you still have concerns or difficulties understanding my intent, feel free to contact me. Of course, the Artistic License...
my$filename=<>; chomp($filename); #Check the file exists but is empty if(-z$filename) { say"$filenamealready exists but empty."; say"Writing content to the file..."; #Open the file for writing open(file_handler,">$filename"); ...