Mac OS X上的Qt C ++编译/链接

Question

I need to write some code for an application that uses a camera with Ethernet connection. The company who made the camera has provided include files to read images from the camera. The files are : ImageLib.h , PvApi.h and PvRegIo.h and some library files libImagelib.a and libPvAPI.a and libPvAPI.dylib libPvJNI.dylib I put the librarie files in /opt/local/lib/ . I put the include files in /opt/local/include/

In the other hand, company provided some *.cpp examples that contains makefile for compilation. I compiled some examples and they worked perfectly. Now, I decide to compile one example provided by the company to list the connected cameras called ListCameras.cpp. I create a new project on QT and just I copied the code of ListCameras.cpp. My ListCameras.pro is like this:c

QT       += core

QT       -= gui

TARGET    = ListCameras
CONFIG   += console
CONFIG   -= app_bundle
TEMPLATE = app
SOURCES += main.cpp
INCLUDEPATH+=-l/opt/local/include/
LIBS+=-L/opt/local/lib/
LIBS+= -lPvAPI
LIBS+= -lPvJNI
DEFINES += _x64 _OSX

Unfortunately, I got these build errors:

15:56:02: Running steps for project ListCameras...
15:56:02: Starting: "/usr/bin/make" 
clang++ -c -pipe -mmacosx-version-min=10.6 -std=c++0x -g -gdwarf-2 -Wall -W -fPIE -D_x64 -D_OSX -DQT_QML_DEBUG -DQT_DECLARATIVE_DEBUG -DQT_CORE_LIB -I../../5.0.2/clang_64/mkspecs/macx-clang -I../ListCameras -I-l/opt/local/include/ -I../../5.0.2/clang_64/include -I../../5.0.2/clang_64/include/QtCore -I../../5.0.2/clang_64/lib/QtCore.framework/Headers -I. -I. -o main.o ../ListCameras/main.cpp
../ListCameras/main.cpp:79:51: warning: unused parameter 'junk' [-Wunused-parameter]
void SetConsoleCtrlHandler(void (*func)(int), int junk)
                                                  ^
../ListCameras/main.cpp:89:23: warning: unused parameter 'Signo' [-Wunused-parameter]
void CtrlCHandler(int Signo)
                      ^
../ListCameras/main.cpp:140:57: warning: flag ' ' results in undefined behavior with 'u' conversion specifier [-Wformat]
                        printf("%s - %8s - Unique ID = % 8lu IP@ = %15s [%s]\n",cameraList[i].SerialString,
                                                       ~^~~~
../ListCameras/main.cpp:147:57: warning: flag ' ' results in undefined behavior with 'u' conversion specifier [-Wformat]
                        printf("%s - %8s - Unique ID = % 8lu (unavailable, %u)\n",cameraList[i].SerialString,
                                                       ~^~~~
../ListCameras/main.cpp:152:53: warning: flag ' ' results in undefined behavior with 'u' conversion specifier [-Wformat]
                    printf("%s - %8s - Unique ID = % 8lu (*)\n",cameraList[i].SerialString,
                                                   ~^~~~
../ListCameras/main.cpp:171:14: warning: unused parameter 'argc' [-Wunused-parameter]
int main(int argc, char* argv[])
             ^
../ListCameras/main.cpp:171:26: warning: unused parameter 'argv' [-Wunused-parameter]
int main(int argc, char* argv[])
                         ^
clang++ -headerpad_max_install_names -mmacosx-version-min=10.6 -o ListCameras main.o   -L/opt/local/lib/ -lPvAPI -lPvJNI -F/Users/rafikgouiaa/Qt//5.0.2/clang_64/lib -framework QtCore 
7 warnings generated.
15:56:02: The process "/usr/bin/make" exited normally.
15:56:02: Configuration unchanged, skipping qmake step.
15:56:02: Could not start process "" 
Error while building/deploying project ListCameras (kit: Desktop Qt 5.0.2 clang 64bit)
When executing step 'Custom Process Step'
15:56:02: Elapsed time: 00:00.

It looks like that it lacks some libraries or flags! Any help please?

---

error

  dyld: Symbol not found: __cg_jpeg_resync_to_restart
  Referenced from: /System/Library/Frameworks/ImageIO.framework/Versions/A/ImageIO
  Expected in: /opt/local/lib//libJPEG.dylib
 in /System/Library/Frameworks/ImageIO.framework/Versions/A/ImageIO

Answer 1

After your edit, it seems that you need a copy of libjpeg . You need to do two things:

1. Add LIBS += -L/opt/local/lib -ljpeg to the .pro file.

2. Install macports and, on the command line, do sudo port install jpeg to install the jpeg library.

Hopefully this solves this particular issue.

Answer 2

You are getting answers about your build, which you need to resolve. You are also getting some warnings from the compilation step, several of which can be safely ignored, but the ones describing undefined behavior should be investigated .