QuaZip - Undefined Reference

[Bonnie]

@FluentCoding
I think this project is supposed to be linked as library, not directly added to other projects.
And what you are doing is something like static linking. So I think you should add

DEFINES += QUAZIP_STATIC

to your .pro file.
Otherwide the headers will think the classes as "dllimport"

[FluentCoding]

@mrjj https://github.com/stachenov/quazip I've downloaded the source and just included it to the project. I also tried to build it but I got some errors. I also have installed zlib but it didn't work, I've uninstalled it. I then added the line LIBS += -lz so that QT's internal zlib library gets added but that didn't work either.

@Bonnie I have already tried it and it didn't work either. It also didn't remove the dllimport warnings.

[mrjj]

@FluentCoding

Windows or linux ?

[FluentCoding]

@mrjj Win10

[mrjj]

@FluentCoding
Ok did you see
"Also note that you may or may not need to define ZLIB_WINAPI (qmake DEFINES+=ZLIB_WINAPI) when linking to zlib on Windows, depending on how zlib was built (generally, if using zlibwapi.dll, this define is needed)."

From where did you install zlib ?

[FluentCoding]

@mrjj From their homepage (the *.msi installer)

[mrjj]

@FluentCoding
https://zlib.net/ ?
and then some of external links ?

I wondering if its for older compiler if not source code.

[FluentCoding]

No, don't think so. Have you ever worked with QuaZip? Or are you aware of any good alternative? I was unlucky with KArchive too.

[mrjj]

@FluentCoding
I only seen it here on forums. I compiled it once in linux but not tried on
Windows hence my questions to see what zlib you used.
if binary, i think its a compiler mismatch issue you are seeing.

I used
https://github.com/kuba--/zip
which is very small and easy to use/compile but
only support zip files.
But for my use case it was ok and speed and compression is super.

[FluentCoding]

@mrjj Thats perfect, thanks! I only need it for zip iirc.

[mrjj]

@FluentCoding
Ok :)
Do note.

It has no recursive function to add all files in all folders but using Qt that is not hard to add.

I tested it with a 1 GB zip file which it handled ok. I cannot say for larger.

It does not support 64 bit zip file so if you get yours from an external source it might be an issue.

[FluentCoding]

Oh aight. Btw is it possible to open a zip file from a QByteArray (from memory generally)? @mrjj

[Christian Ehrlicher]

@FluentCoding said in QuaZip - Undefined Reference:

Btw is it possible to open a zip file from a QByteArray (from memory generally)?

yes

[FluentCoding]

@Christian-Ehrlicher How, if I may ask? I haven't found the appropiate method for that.

[mrjj]

@FluentCoding
Hi
Yes it can be both memory and file-based
see section
Extract a zip entry into memory using callback.

[FluentCoding]

This post is deleted!

[FluentCoding]

@mrjj Thanks but I meant from memory, not into memory.

[mrjj]

@FluentCoding
if you mean
Can i add a buffer to the zip file as was it a file then yes :)

                auto bytes = QByteArray::fromRawData(reinterpret_cast<const char *>(memory), int(fileSize32Bit));
                zip_entry_write(zip, bytes, fileSize32Bit);

[FluentCoding]

@mrjj Alright - (hopefully the) last question: How can I create zip_t object without zip_open, so that i only use zip_entry_write to add the buffer? Should I just create an object of the struct zip_t? Also, should I replace fileSize32Bit with the size of the QByteArray?

[mrjj]

Hi
I have not tried that but look in zip.c and

struct zip_t *zip_open(const char *zipname, int level, char mode) {

I think you can init it up as you like if you follow that code and the various modes + flags.

Yes, fileSize32Bit should be the QByteArray size.