qt调用Linux下自定义的动态链接库有关问题

qt调用Linux下自定义的动态链接库问题
我在Linux下用C写了个动态链接库，而且用C写了个测试函数可以正常使用。
http://blog.****.net/qianguozheng/article/details/6786505
但是我改由Qt写了个测试函数的时候

C/C++ code

#include <QApplication>
#include "socklib.h"
int main(int argc,char *argv[])
{
  QApplication app(argc,argv);

  char *title;
  title=getWebPageTitle("www.yahoo.com");
  //  QMessageBox::information();
  qDebug("Title:%s",title);
  return app.exec();
}

修改了Makefile

C/C++ code


#############################################################################
# Makefile for building: testqt
# Generated by qmake (2.01a) (Qt 4.6.2) on: Sun Sep 18 21:01:58 2011
# Project:  testqt.pro
# Template: app
# Command: /usr/bin/qmake -unix -o Makefile testqt.pro
#############################################################################

####### Compiler, tools and options

CC            = gcc
CXX           = g++
DEFINES       = -DQT_NO_DEBUG -DQT_GUI_LIB -DQT_CORE_LIB -DQT_SHARED
CFLAGS        = -pipe -O2 -Wall -W -D_REENTRANT $(DEFINES)
CXXFLAGS      = -pipe -O2 -Wall -W -D_REENTRANT $(DEFINES)
INCPATH       = -I/usr/share/qt4/mkspecs/linux-g++ -I. -I/usr/include/qt4/QtCore -I/usr/include/qt4/QtGui -I/usr/include/qt4 -I. -I.
LINK          = g++
LFLAGS        = -Wl,-O1
LIBS          = $(SUBLIBS)  -L/usr/lib -lQtGui -lQtCore -lpthread -L../lib/ -lsock
AR            = ar cqs
RANLIB        = 
QMAKE         = /usr/bin/qmake
TAR           = tar -cf
COMPRESS      = gzip -9f
COPY          = cp -f
SED           = sed
COPY_FILE     = $(COPY)
COPY_DIR      = $(COPY) -r
STRIP         = strip
INSTALL_FILE  = install -m 644 -p
INSTALL_DIR   = $(COPY_DIR)
INSTALL_PROGRAM = install -m 755 -p
DEL_FILE      = rm -f
SYMLINK       = ln -f -s
DEL_DIR       = rmdir
MOVE          = mv -f
CHK_DIR_EXISTS= test -d
MKDIR         = mkdir -p

####### Output directory

OBJECTS_DIR   = ./

####### Files

SOURCES       = main.cpp 
OBJECTS       = main.o
DIST          = /usr/share/qt4/mkspecs/common/g++.conf \
        /usr/share/qt4/mkspecs/common/unix.conf \
        /usr/share/qt4/mkspecs/common/linux.conf \
        /usr/share/qt4/mkspecs/qconfig.pri \
        /usr/share/qt4/mkspecs/features/qt_functions.prf \
        /usr/share/qt4/mkspecs/features/qt_config.prf \
        /usr/share/qt4/mkspecs/features/exclusive_builds.prf \
        /usr/share/qt4/mkspecs/features/default_pre.prf \
        /usr/share/qt4/mkspecs/features/release.prf \
        /usr/share/qt4/mkspecs/features/default_post.prf \
        /usr/share/qt4/mkspecs/features/warn_on.prf \
        /usr/share/qt4/mkspecs/features/qt.prf \
        /usr/share/qt4/mkspecs/features/unix/thread.prf \
        /usr/share/qt4/mkspecs/features/moc.prf \
        /usr/share/qt4/mkspecs/features/resources.prf \
        /usr/share/qt4/mkspecs/features/uic.prf \
        /usr/share/qt4/mkspecs/features/yacc.prf \
        /usr/share/qt4/mkspecs/features/lex.prf \
        /usr/share/qt4/mkspecs/features/include_source_dir.prf \
        testqt.pro
QMAKE_TARGET  = testqt
DESTDIR       = 
TARGET        = testqt

first: all
####### Implicit rules

.SUFFIXES: .o .c .cpp .cc .cxx .C

.cpp.o:
    $(CXX) -c $(CXXFLAGS) $(INCPATH) -o "$@" "$<"

.cc.o:
    $(CXX) -c $(CXXFLAGS) $(INCPATH) -o "$@" "$<"

.cxx.o:
    $(CXX) -c $(CXXFLAGS) $(INCPATH) -o "$@" "$<"

.C.o:
    $(CXX) -c $(CXXFLAGS) $(INCPATH) -o "$@" "$<"

.c.o:
    $(CC) -c $(CFLAGS) $(INCPATH) -o "$@" "$<"

####### Build rules

all: Makefile $(TARGET)

$(TARGET):  $(OBJECTS)  
    $(LINK) $(LFLAGS) -o $(TARGET) $(OBJECTS) $(OBJCOMP) $(LIBS) -L../lib -lsock

Makefile: testqt.pro  /usr/share/qt4/mkspecs/linux-g++/qmake.conf /usr/share/qt4/mkspecs/common/g++.conf \
        /usr/share/qt4/mkspecs/common/unix.conf \
        /usr/share/qt4/mkspecs/common/linux.conf \
        /usr/share/qt4/mkspecs/qconfig.pri \
        /usr/share/qt4/mkspecs/features/qt_functions.prf \
        /usr/share/qt4/mkspecs/features/qt_config.prf \
        /usr/share/qt4/mkspecs/features/exclusive_builds.prf \
        /usr/share/qt4/mkspecs/features/default_pre.prf \
        /usr/share/qt4/mkspecs/features/release.prf \
        /usr/share/qt4/mkspecs/features/default_post.prf \
        /usr/share/qt4/mkspecs/features/warn_on.prf \
        /usr/share/qt4/mkspecs/features/qt.prf \
        /usr/share/qt4/mkspecs/features/unix/thread.prf \
        /usr/share/qt4/mkspecs/features/moc.prf \
        /usr/share/qt4/mkspecs/features/resources.prf \
        /usr/share/qt4/mkspecs/features/uic.prf \
        /usr/share/qt4/mkspecs/features/yacc.prf \
        /usr/share/qt4/mkspecs/features/lex.prf \
        /usr/share/qt4/mkspecs/features/include_source_dir.prf \
        /usr/lib/libQtGui.prl \
        /usr/lib/libQtCore.prl
    $(QMAKE) -unix -o Makefile testqt.pro
/usr/share/qt4/mkspecs/common/g++.conf:
/usr/share/qt4/mkspecs/common/unix.conf:
/usr/share/qt4/mkspecs/common/linux.conf:
/usr/share/qt4/mkspecs/qconfig.pri:
/usr/share/qt4/mkspecs/features/qt_functions.prf:
/usr/share/qt4/mkspecs/features/qt_config.prf:
/usr/share/qt4/mkspecs/features/exclusive_builds.prf:
/usr/share/qt4/mkspecs/features/default_pre.prf:
/usr/share/qt4/mkspecs/features/release.prf:
/usr/share/qt4/mkspecs/features/default_post.prf:
/usr/share/qt4/mkspecs/features/warn_on.prf:
/usr/share/qt4/mkspecs/features/qt.prf:
/usr/share/qt4/mkspecs/features/unix/thread.prf:
/usr/share/qt4/mkspecs/features/moc.prf:
/usr/share/qt4/mkspecs/features/resources.prf:
/usr/share/qt4/mkspecs/features/uic.prf:
/usr/share/qt4/mkspecs/features/yacc.prf:
/usr/share/qt4/mkspecs/features/lex.prf:
/usr/share/qt4/mkspecs/features/include_source_dir.prf:
/usr/lib/libQtGui.prl:
/usr/lib/libQtCore.prl:
qmake:  FORCE
    @$(QMAKE) -unix -o Makefile testqt.pro

dist: 
    @$(CHK_DIR_EXISTS) .tmp/testqt1.0.0 || $(MKDIR) .tmp/testqt1.0.0 
    $(COPY_FILE) --parents $(SOURCES) $(DIST) .tmp/testqt1.0.0/ && $(COPY_FILE) --parents socklib.h .tmp/testqt1.0.0/ && $(COPY_FILE) --parents main.cpp .tmp/testqt1.0.0/ && (cd `dirname .tmp/testqt1.0.0` && $(TAR) testqt1.0.0.tar testqt1.0.0 && $(COMPRESS) testqt1.0.0.tar) && $(MOVE) `dirname .tmp/testqt1.0.0`/testqt1.0.0.tar.gz . && $(DEL_FILE) -r .tmp/testqt1.0.0


clean:compiler_clean 
    -$(DEL_FILE) $(OBJECTS)
    -$(DEL_FILE) *~ core *.core


####### Sub-libraries

distclean: clean
    -$(DEL_FILE) $(TARGET) 
    -$(DEL_FILE) Makefile


mocclean: compiler_moc_header_clean compiler_moc_source_clean

mocables: compiler_moc_header_make_all compiler_moc_source_make_all

compiler_moc_header_make_all:
compiler_moc_header_clean:
compiler_rcc_make_all:
compiler_rcc_clean:
compiler_image_collection_make_all: qmake_image_collection.cpp
compiler_image_collection_clean:
    -$(DEL_FILE) qmake_image_collection.cpp
compiler_moc_source_make_all:
compiler_moc_source_clean:
compiler_uic_make_all:
compiler_uic_clean:
compiler_yacc_decl_make_all:
compiler_yacc_decl_clean:
compiler_yacc_impl_make_all:
compiler_yacc_impl_clean:
compiler_lex_make_all:
compiler_lex_clean:
compiler_clean: 

####### Compile

main.o: main.cpp socklib.h
    $(CXX) -c -L../lib -lsock $(CXXFLAGS) $(INCPATH) -o main.o main.cpp  

####### Install

install:   FORCE

uninstall:   FORCE

FORCE:

qt调用Linux下自定义的动态链接库有关问题

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