QT中的 Hello World 分析.（非IDE）
最近又要做个QT的界面，没办法重新拾起，没有IDE怎么办？还好以前的类库啥的都在。
#include <QApplication>
#include <QPushButton>
int main(int argc,char *argv[])
{
QApplication app(argc,argv);
QPushButton b("Hello World!");
b.show();
QObject::connect(&b,SIGNAL(clicked()),&app,SLOT(quit()));
return app.exec();
}
最简单的Hello World.
关键在于编译方法。
文件夹为QHello
上述代码保存为hello.cpp
qmake -project //生成项目文件QHello.pro （根据文件夹生成项目文件） qmake //生成Makefile make //生成可执行文件QHello ，及目标文件hello.o ./QHello
QHello.pro 内容
###################################################################### # Automatically generated by qmake (2.01a) Tue Aug 23 08:41:26 2011 ###################################################################### TEMPLATE = app TARGET = DEPENDPATH += . INCLUDEPATH += . # Input SOURCES += hello.cpp //自动扫描源文件
Makefile 内容比较冗余：看看前面的注释部分就可以了，有兴趣的可以研读。
#############################################################################
# Makefile for building: QHello
# Generated by qmake (2.01a) (Qt 4.6.2) on: Tue Aug 23 08:41:30 2011
# Project: QHello.pro
# Template: app
# Command: /usr/bin/qmake -unix -o Makefile QHello.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
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 = hello.cpp
OBJECTS = hello.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 \
QHello.pro
QMAKE_TARGET = QHello
DESTDIR =
TARGET = QHello
first: all
####### Implicit rules
.SUFFIXES: .o .c .cpp .cc .cxx .C
.cpp.o:
$(CXX) -c $(CXXFLAGS) $(INCPATH) -o "$@" "{1}lt;"
.cc.o:
$(CXX) -c $(CXXFLAGS) $(INCPATH) -o "$@" "{1}lt;"
.cxx.o:
$(CXX) -c $(CXXFLAGS) $(INCPATH) -o "$@" "{1}lt;"
.C.o:
$(CXX) -c $(CXXFLAGS) $(INCPATH) -o "$@" "{1}lt;"
.c.o:
$(CC) -c $(CFLAGS) $(INCPATH) -o "$@" "{1}lt;"
####### Build rules
all: Makefile $(TARGET)
$(TARGET): $(OBJECTS)
$(LINK) $(LFLAGS) -o $(TARGET) $(OBJECTS) $(OBJCOMP) $(LIBS)
Makefile: QHello.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
$(QMAKE) -unix -o Makefile QHello.pro
/usr/share/qt4/mkspecs/common/g++.conf:
/usr/share/qt4/mkspecs/common/unix.conf:
/usr/share/qt4/mkspecs/common/linux.conf:
/usr/share/qt4/mkspecs/qconfig.pri:
/usr/share/qt4/mkspecs/features/qt_functions.prf:
/usr/share/qt4/mkspecs/features/qt_config.prf:
/usr/share/qt4/mkspecs/features/exclusive_builds.prf:
/usr/share/qt4/mkspecs/features/default_pre.prf:
/usr/share/qt4/mkspecs/features/release.prf:
/usr/share/qt4/mkspecs/features/default_post.prf:
/usr/share/qt4/mkspecs/features/warn_on.prf:
/usr/share/qt4/mkspecs/features/qt.prf:
/usr/share/qt4/mkspecs/features/unix/thread.prf:
/usr/share/qt4/mkspecs/features/moc.prf:
/usr/share/qt4/mkspecs/features/resources.prf:
/usr/share/qt4/mkspecs/features/uic.prf:
/usr/share/qt4/mkspecs/features/yacc.prf:
/usr/share/qt4/mkspecs/features/lex.prf:
/usr/share/qt4/mkspecs/features/include_source_dir.prf:
/usr/lib/libQtGui.prl:
/usr/lib/libQtCore.prl:
qmake: FORCE
@$(QMAKE) -unix -o Makefile QHello.pro
dist:
@$(CHK_DIR_EXISTS) .tmp/QHello1.0.0 || $(MKDIR) .tmp/QHello1.0.0
$(COPY_FILE) --parents $(SOURCES) $(DIST) .tmp/QHello1.0.0/ && $(COPY_FILE) --parents hello.cpp .tmp/QHello1.0.0/ && (cd `dirname .tmp/QHello1.0.0` && $(TAR) QHello1.0.0.tar QHello1.0.0 && $(COMPRESS) QHello1.0.0.tar) && $(MOVE) `dirname .tmp/QHello1.0.0`/QHello1.0.0.tar.gz . && $(DEL_FILE) -r .tmp/QHello1.0.0
clean:compiler_clean
-$(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
hello.o: hello.cpp
$(CXX) -c $(CXXFLAGS) $(INCPATH) -o hello.o hello.cpp
####### Install
install: FORCE
uninstall: FORCE
FORCE: