write an entire compressed file
WriteFile(gzipfilename, data, opts, gzipopts)
WriteFile(target in zipfilename, data, opts)
string or an rtable of hardware datatype numbers
(optional) options as specified below
format : bzip2, zip, or gzip ; specify the output format explicitly
output : bytes ; write bytes of string input directly to file, even when target ends in ".m" or ".mpl". even
gzipopts : additional compression options to pass to zlib see FileTools[Compressed].
WriteFile is an all-in-one command to open a file, write data in a compressed format, and close the file.
For bzip2 and gzip formats, the default action is to overwrite the target file.
For zip format, the file zipfilename is a container, so a target filename target within the archive filename must be specified. This is done with the syntax target in filename. If target exists in zipfilename already, it will be replaced. Replacing a file in a zip archive will force all other open handles to the same zip file to be closed. If the target does not exist it will be appended to the zip file alongside any other pre-existing data.
By default, the bytes of a string or hardware rtable are compressed and written to the target file. Arbitrary Maple objects, such as non-hardware rtables can be written only if the name of the in-zip file target being written ends in ".m" or ".mpl". In these cases, the Maple data structure is converted to either external save format, or plain text format before writing. Specifying output=bytes will override the filename matching, and always write the bytes of a string or Array (and fail on other objects).
Create a temporary file in gzip format, write data, and retrieve it.
file ≔ FileToolsTemporaryFilename⁡FileToolsJoinPath⁡FileToolsTemporaryDirectory⁡,GZtest-
FileToolsCompressedWriteFile⁡file,This is a test
This is a test
zipfile ≔ FileToolsTemporaryFilename⁡FileToolsJoinPath⁡FileToolsTemporaryDirectory⁡,Ziptest-
FileTools[Compressed][WriteFile]("inZipName" in zipfile, "This is a zip test");
FileTools[Compressed][WriteFile]("data" in zipfile, "This is a second file");
FileTools[Compressed][ReadFile]("data" in zipfile, string);
This is a second file
FileTools[Compressed][ReadFile]("inZipName" in zipfile, string);
This is a zip test
The FileTools[Compressed][WriteFile] command was introduced in Maple 16.
For more information on Maple 16 changes, see Updates in Maple 16.
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