Build c++ Qt CLI Tool with Quazip - c++

Question

so normally I am an embedded software developer first time I need to do something like that... So I am no expert at all at this... I have come this far with a lot of googling and trial and error methods...
What I want to do
I need to write a C++ CLI application which can zip and unzip files.
Quazip
zlib
My general conditions
I want to use Qt and Quazip since Qt doesn't support zipping natively (or does it).
I want to build with Mingw and CMake for Windows 64bit on a Windows 64bit system.
With my knowledge, it would be best if I compile Quazip statically so I don't depend on any other quazip DLL which may be present on other systems...
How I think It works
I need to compile zlib
Then I need to compile Quazip (with zlib)
Link the compiled libraries to my project.
My research
I found two good youtube videos which should help me:
https://www.youtube.com/watch?v=5ZTusMX-Reo
https://www.youtube.com/watch?v=mxlcKmvMK9Q
No of these ways did work out for me.
Also I found that blog post which was a little bit of help...
http://www.antonioborondo.com/2014/10/22/zipping-and-unzipping-files-with-qt/
This site was available till yesterday now it's gone :D
Also I found that old Stackoverflow question which helped me a bit:
How to connect the QuaZip library in CMake
Detailed steps on what I did:
1. Building zlib
Downloaded the latest version of zlib from the official website. version 1.2.11
I build zlib with the following commands:
cd C:/some/Path/zlib-1.2.11
mingw32-make -f win32/Makefile.gcc
That works perfectly I get a
libz.a
libz.dll.a
zlib1.dll
those files and all the header files (11 files) I copy in a seperate folder. Which looks like this:
Build
|
+-include
+-lib
Headers in the include folder the libs in the lib folder.
2. Building Quazip
Now the messy part...
Downloading the newest version of Quazip (version 0.8.1) from the GitHub.
I tried various ways to compile Quazip. The one I stick to was:
Open the .pro file in Qt creator inside the quazip folder (the folder where the sources are located).
So then I added the compiled zlib to the Qmake file.
Following lines I added at the end of the file:
INCLUDEPATH += "C:/Build/include"
LIBS += -L"C:/Build/lib"
LIBS += -lz
Then build Quazip with QtCreator as release Build.
When compiled I get
quazip.dll
libquazip.a
I copy all the header files from quazip (16 fils) in the include folder and the two libs in the lib folder.
Now I have like a zippackage in the build folder.
3. Adding Quazip and zlib to my Project
Copied the FindQuazip.cmake file into my project form the Quazip Repo.
In my CMakeLists.txt I added the following lines:
set(ZLIB_ROOT "C:/BUILD" CACHE PATH "Path to zlib")
find_package(ZLIB REQUIRED)
list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/cmake")
find_package(QuaZip REQUIRED)
I need to set the ZLIB_ROOT so CMake uses the zlib I want. If I don't set Root he uses a zlib from a ruby installation from my PC.
Also I added
include_directories(
"${BASE_DIR}/sources"
"${QUAZIP_INCLUDE_DIR}"
)
and at the end
add_executable(${PROJECT_NAME} ${SOURCES} ${INC_ALL} )
target_link_libraries(${PROJECT_NAME} Qt5::Network Qt5::Core Qt5::Widgets
${ZLIB_LIBRARIES}
${QUAZIP_LIBRARIES}
)
Then I needed to add the FindQuazip.cmake since it would find the libs: I edited the following:
FIND_PATH(QUAZIP_LIBRARY_DIR
WIN32_DEBUG_POSTFIX d
NAMES libquazip.a #quazip.dll
HINTS "C:/Build/lib"
PATH_SUFFIXES QuaZip/lib
)
FIND_LIBRARY(QUAZIP_LIBRARIES NAMES libquazip.a HINTS ${QUAZIP_LIBRARY_DIR})
FIND_PATH(QUAZIP_INCLUDE_DIR NAMES quazip.h HINTS ${QUAZIP_LIBRARY_DIR}/../include)
FIND_PATH(QUAZIP_ZLIB_INCLUDE_DIR NAMES zlib.h)
Okay so It took me two days to get to there where I am now.
Now when I run CMake every works fine. He finds the libs.
I can even include a the Header files of Quazip. But when I then try to compile a minimal example the linker can't find any symbols.
Minimal Example:
#include <iostream>
#include <QApplication>
#include "JlCompress.h"
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
cout << __cplusplus << endl;
cout << "Hello World!" << endl;
JlCompress::compressDir("C:/WorkspaceLokal/Test/test.zip", "C:/WorkspaceLokal/Test/TestFolder");
return a.exec();
}
By compiling it I get the following error:
C:\some\path\sources\main.cpp:-1: Fehler: undefined reference to `JlCompress::compressDir(QString, QString, bool)'
This means the linker can't link the function...
My Question
What am I doing wrong?
Do I need to compile Quazip in another way?
Edit 4:
since it now works how to I compile the Quazip as a static lib, so that I can link it statically to my application?
Thanks in advance...
Edit 1:
Here are the QUAZIP variables from Qt creator:
Edit 2:
Okay. Some news. the libquazip.a is something else and doesn't work. If I link against the quazip.dll compiling works. But when I run the application it crashes at the function call compressDir...
Edit 3:
It works. I just needed to copy the quazip.dll to the compiled executable...

Answer 1

From QuaZip's pro file:
# You'll need to define this one manually if using a build system other
# than qmake or using QuaZIP sources directly in your project.
CONFIG(staticlib): DEFINES += QUAZIP_STATIC
This should trigger when you add staticlib to the CONFIG in quazip.pro (2nd line):
CONFIG += qt warn_on staticlib
If you are not using qmake to build Quazip, just make sure that you #define QUAZIP_STATIC in a way specific to your build system