QT之GUI学习笔记(一)

在http://blog.51cto.com/zt/20中有全部的学习笔记。我只是按照自己的步骤将过程再进行一遍来加深理解。 1.打开Qt Creator,点击 文件->新建 按照如图所示步骤进行 点击Qt Widgets Application后，出现如下界面 名称为helloWorld 一直点击下一步，直至完成。 2.整个文件结构如下 3.在HelloWorld.pro中加入如下代码

INCLUDEPATH+=D:\InstallOpencv\opencvBinary\include\opencv\ D:\InstallOpencv\opencvBinary\include\opencv2\ D:\InstallOpencv\opencvBinary\include LIBS+= D:\InstallOpencv\opencvBinary\lib\libopencv_bgsegm310.dll.a\ D:\InstallOpencv\opencvBinary\lib\libopencv_bioinspired310.dll.a\ D:\InstallOpencv\opencvBinary\lib\libopencv_calib3d310.dll.a\ D:\InstallOpencv\opencvBinary\lib\libopencv_ccalib310.dll.a\ D:\InstallOpencv\opencvBinary\lib\libopencv_core310.dll.a\ D:\InstallOpencv\opencvBinary\lib\libopencv_cvv310.dll.a\ D:\InstallOpencv\opencvBinary\lib\libopencv_datasets310.dll.a\ D:\InstallOpencv\opencvBinary\lib\libopencv_dnn310.dll.a\ D:\InstallOpencv\opencvBinary\lib\libopencv_dpm310.dll.a\ D:\InstallOpencv\opencvBinary\lib\libopencv_face310.dll.a\ D:\InstallOpencv\opencvBinary\lib\libopencv_features2d310.dll.a\ D:\InstallOpencv\opencvBinary\lib\libopencv_flann310.dll.a\ D:\InstallOpencv\opencvBinary\lib\libopencv_fuzzy310.dll.a\ D:\InstallOpencv\opencvBinary\lib\libopencv_highgui310.dll.a\ D:\InstallOpencv\opencvBinary\lib\libopencv_imgcodecs310.dll.a\ D:\InstallOpencv\opencvBinary\lib\libopencv_imgproc310.dll.a\ D:\InstallOpencv\opencvBinary\lib\libopencv_line_descriptor310.dll.a\ D:\InstallOpencv\opencvBinary\lib\libopencv_ml310.dll.a\ D:\InstallOpencv\opencvBinary\lib\libopencv_objdetect310.dll.a\ D:\InstallOpencv\opencvBinary\lib\libopencv_phase_unwrapping310.dll.a\ D:\InstallOpencv\opencvBinary\lib\libopencv_photo310.dll.a\ D:\InstallOpencv\opencvBinary\lib\libopencv_plot310.dll.a\ D:\InstallOpencv\opencvBinary\lib\libopencv_reg310.dll.a\ D:\InstallOpencv\opencvBinary\lib\libopencv_rgbd310.dll.a\ D:\InstallOpencv\opencvBinary\lib\libopencv_saliency310.dll.a\ D:\InstallOpencv\opencvBinary\lib\libopencv_shape310.dll.a\ D:\InstallOpencv\opencvBinary\lib\libopencv_stereo310.dll.a\ D:\InstallOpencv\opencvBinary\lib\libopencv_stitching310.dll.a\ D:\InstallOpencv\opencvBinary\lib\libopencv_structured_light310.dll.a\ D:\InstallOpencv\opencvBinary\lib\libopencv_superres310.dll.a\ D:\InstallOpencv\opencvBinary\lib\libopencv_surface_matching310.dll.a\ D:\InstallOpencv\opencvBinary\lib\libopencv_text310.dll.a\ D:\InstallOpencv\opencvBinary\lib\libopencv_tracking310.dll.a\ D:\InstallOpencv\opencvBinary\lib\libopencv_video310.dll.a\ D:\InstallOpencv\opencvBinary\lib\libopencv_videoio310.dll.a\ D:\InstallOpencv\opencvBinary\lib\libopencv_videostab310.dll.a\ D:\InstallOpencv\opencvBinary\lib\libopencv_xfeatures2d310.dll.a\ D:\InstallOpencv\opencvBinary\lib\libopencv_xobjdetect310.dll.a\ D:\InstallOpencv\opencvBinary\lib\libopencv_xphoto310.dll.a

这些代码用于配置运行环境 4.在main.cpp中修改代码，改为如下代码

#include <QApplication> #include <QLabel> int main(int argc, char *argv[]) { QApplication a(argc, argv); QLabel *label = new QLabel("Hello, world!"); label->show(); return a.exec(); }

5.按照 构建->qmake->run的顺序进行执行，需要注意:执行的版本是release版本还是debug版本。 执行结果如下 6.对代码的解释如下 http://devbean.blog.51cto.com/448512/194137 其中 (1) QLabel *label = new QLabel("Hello, world!"); label->show(); 是指创建一个Label标签，标签需要使用show()函数才能显示出来 (2)return app.exec(); 将应用程序的控制权移交给Qt。这时，程序的事件循环就开始了，也就是说，这时可以响应你发出的各种事件了 7.Qt支持Html解析 讲main.cpp的代码改为如下形式

这里写代码片#include <QApplication> #include <QLabel> int main(int argc, char *argv[]) { QApplication a(argc, argv); QLabel *label = new QLabel("<h2><font color='red'>Hello</font>, world!<h2>"); label->show(); return a.exec(); }

运行结果如下 8.在main.cpp中 main 函数不能缺少的两行代码是

#include <QApplication> #include <QLabel> int main(int argc, char *argv[]) { QApplication a(argc, argv); ...................................... return a.exec(); }