Another static library issue. [solved]

[heliosbird]

I followed this guide for creating and using a static library in Qt:
https://qt-project.org/wiki/How_to_create_a_library_with_Qt_and_use_it_in_an_application

I have a class that I would like to use in Matlab, so I would like to create a static library. I am using Qt 4.8.0, statically compiled, commercial on a Windows 7 machine.

I created a project for the library:
@
QT += network
TEMPLATE = lib
CONFIG+= staticlib

Input

INCLUDEPATH += ../common/output
../common/input
../common/core
../common/crc

HEADERS += ../common/output/imageUdpSender.h
../common/input/image.h
../common/core/coreModule.h
../common/input/internalProtocol.h
../common/output/testState.h
../common/crc/crc.h

SOURCES += ../common/output/imageUdpSender.cpp
../common/core/coreModule.cpp
../common/output/testState.cpp
../common/crc/crc.cpp

INTF_VERSION = 2
INTF_VERSTR = '\"$${INTF_VERSION}\"'
DEFINES += INTERFACE_VERSION="$${INTF_VERSTR}"

TARGET = ../../../ShutterSoftware/build/Library

static { # everything below takes effect with CONFIG += static
TARGET = ../../../../../ShutterSoftware/build/static/Library
CONFIG += static
QTPLUGIN += qsvg qico #qpng # image formats
DEFINES += STATIC
message("~~~ static build ~~~") # this is for information, that the static build is done
mac: TARGET = $$join(TARGET,,static,_static) #this adds an _static in the end, so you can seperate static build from non static build
win32: TARGET = $$join(TARGET,,static,s) #this adds an s in the end, so you can seperate static build from non static build
}
@

The above project creates a *.lib. However, when I tried to include it in a project, I get this error:

@C:\Users\IKOMED6\Documents\SVN\Software\ShutterControlGUI\Qt\ShutterSoftware\ShutterUILibrary\TestLibrary\main.cpp:2: error: C1083: Cannot open include file: 'imageUdpSender.h': No such file or directory@

The project file for the project trying to use the library:

@QT += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = TestLibrary
TEMPLATE = app

SOURCES += main.cpp
mainwindow.cpp

HEADERS += mainwindow.h

FORMS += mainwindow.ui

INCLUDEPATH += $$PWD/../../build/static
LIBS += -static -L$$PWD/../../build/static/ -lLibrarys.lib

TARGET = ../../../ShutterSoftware/build/TestLibrary

static { # everything below takes effect with CONFIG += static
TARGET = ../../../../../ShutterSoftware/build/static/TestLibrary
CONFIG += static
QTPLUGIN += qsvg qico #qpng # image formats
DEFINES += STATIC
message("~~~ static build ~~~") # this is for information, that the static build is done
mac: TARGET = $$join(TARGET,,static,_static) #this adds an _static in the end, so you can seperate static build from non static build
win32: TARGET = $$join(TARGET,,static,s) #this adds an s in the end, so you can seperate static build from non static build
}
@

and the main.cpp is extremely simple (I only made this project to test the .lib):

@#include "mainwindow.h"
#include "imageUdpSender.h"

int main(int argc, char *argv[])
{

}@

I'm not sure what is wrong... how do I even know if the *.lib was created properly? I've tried everything I've found online, so I'm at a loss...

Thanks in advance.

[SGaist]

Hi,

Currently, you're not even linking to your library, what you have is an INCLUDEPATH problem. Where is "imageUdpSender.h" located ?

[heliosbird]

Thanks for your speedy reply! The imageUdpSender.h is located in common/output, which I have in the include path: ../common/output

Now, I originally thought this was the issue, but when I comment out image.h (which is included in imageUdpSender.h), the Library project will not compile and states it is missing image.h. To me, this indicated that I am linking to the library in Library.pro, but I guess I'm wrong.

Here is the folder structure, I hope this makes sense.

Project Folder
-common
--input
--output
--core
--crc
-build
--static
---Librarys.lib # not a typo
-Library (Project to create static library)
--library.pro (ie. first .pro above)
-TestLibrary (Project to test above static library)
--Test.pro (ie. second .pro above)
--main.cpp (above)

[heliosbird]

I had a fundamental misunderstanding about static libraries. I think I have it cleared up now, thanks.