[Feature Request]: how to uncompress Multi-volume archives file

[anywhereyang]

Feature description

any example ?

Additional context

No response

Code of Conduct

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[anywhereyang]

Bit7zLibrary lib{ L"7za.dll" };
BitExtractor extractorSplit{ lib, BitFormat::Split };
extractorSplit.extract(L"C:\\Users\\Lenovo\\Desktop\\test\\Steam.7z.001", L"E:/steam/"); //extracting a simple archive

the exception is CLASS_E_CLASSNOTAVAILABLE ClassFactory cannot supply requested class

7z ver:Download 7-Zip 22.01 (2022-07-15): bit 7z :v3.1.5

[rikyoz]

Hi! Your code is correct except for the DLL you're using: the 7za.dll supports only the 7z format, so you cannot use it to extract Split/multi-volume archives. In your case, you should use the 7z.dll, which supports all archive formats, including the BitFormat::Split. On this wiki page you can find a more detailed comparison table of all 7-zip DLLs.

Please also note that extracting a multi-volume archive produces a full single-file archive, which then you must extract again using another extractor with the corresponding archive format (i.e., your Steam.7z.001 will be extracted to a Steam.7z file, which in turn you have to extract again with a BitFormat::SevenZip extractor).

[anywhereyang]

the full code: Bit7zLibrary lib{ L"7z.dll" }; BitExtractor extractor{ lib, BitFormat::SevenZip }; BitExtractor extractorSplit{ lib, BitFormat::Split }; extractorSplit.extract(L"C:\\Users\\Lenovo\\Desktop\\test\\Steam.7z.001", L"E:/"); extractor.extract(L"E:\\Steam.7z", L"E:/steam/"); int c = 0; new question :

. if the multi-volume archives size more than 200GB, it will produces a big temp file,,it is vexed

[rikyoz]

if the multi-volume archives size more than 200GB, it will produces a big temp file,,it is vexed

Yeah, unfortunately, this is a known limitation of the library (issue #92). I will definitely work on providing a more efficient API that doesn't require extracting the intermediate files. I hope to implement it in a future release of the library asap.

[anywhereyang]

ok,tks