qt4项目迁移到qt5，遇到的问题及解决办法

桃扇骨 2022-05-11 01:58 1183阅读 0赞

1.解压qt5.9.6  
/root/APP\_QtKit\_qt596\_share

2.必须使用complier4.9.2  
/home/dever/Works/U411/0.GCCKIT/gcc-linaro-arm-linux-gnueabihf-4.9-2014.09\_linux

3.报错 error: QtGui/QAction: No such file or directory \#include  
3.1解决的方法是在.pro文件开头加上以下两行代码：  
QT += core gui  
greaterThan(QT\_MAJOR\_VERSION, 4): QT += widgets  
3.2  
\#include <QtGui/QAction>  
\#include <QtGui/QApplication>  
去掉QtGui  
\#include <QAction>  
\#include <QApplication>  
3.3  
或  自动适配  
\#if QT\_VERSION < QT\_VERSION\_CHECK(5, 0, 0)  
    \#include <QtGui>  
\#else  
    \#include <QWidget>  
\#endif

4.报错 error: QWSServer: No such file or directory  
QT5没有QWS，用QPA  
https://www.cnblogs.com/sankye/p/4643173.html

屏蔽代码 //\#include <QWSServer>  
5.报错 error: QWSPointerCalibrationData: No such file or directory  
 \#include <QWSPointerCalibrationData>

屏蔽mywidget.cpp代码34  //\#include "calibration.h"

6.报错 /root/work/GSE/AM335widget/Common/GblDataTypeDefine.h:716: error: cast from ‘UINT16\* \{aka short unsigned int\*\}’ to ‘int’ loses precision \[-fpermissive\]  
 \#define CAP\_TYPE OFFSET\_OF(\_SYS\_DSP\_SET\_INFO\_T, u16CapType) //机型容量类型: 10,15,20,30 KVA  
6.1方法一  
OFFSET\_OF中的int改为 long===========================不知道是否有影响=========================  
6.2方法二  
https://blog.csdn.net/yunwy/article/details/44732101  
QMAKE\_CXXFLAGS += -m32  
QMAKE\_LINK += -m32

7.报错 error: QInputContext: No such file or directory  
QT5没有软键盘  
屏蔽MainThread.cpp代码25 //\#include "myinputpanelcontext.h"

8.报错 error: ‘setCodecForTr’ is not a member of ‘QTextCodec’  
Qt5 取消了QTextCodec::setCodecForTr()和QTextCodec::setCodecForCString()这两个函数。直接将 QTextCodec::setCodecForLocale(QTextCodec::codecForName(“UTF8”)) 至于QApplication实例之前即可解决  
   
   QTextCodec \*codec = QTextCodec::codecForName("UTF-8");//"System"  
 //   QTextCodec::setCodecForTr(codec);  
    QTextCodec::setCodecForLocale(codec);  
  //  QTextCodec::setCodecForCStrings(codec);

9.报错 'class QString' has no member named 'toAscii'.  
Qt5 没有toAscii了。不过可以用toLatin1或者qPrintable()

10.报错 error: variable \`QPainter painter' has initializer but incomplete type  
在.cpp文件中添加  \#include "qpainter.h"

11.报错 error: invalid use of incomplete type ‘class QTimerEvent’     
在.cpp文件中添加  \#include<QTimerEvent>

12.报错 error: ‘UnicodeUTF8’ is not a member of ‘QApplication’     
原因是：QCoreApplication::UnicodeUTF8已被弃用  
修改 first\_page->setText(QApplication::translate("Form2", "|<", 0, QApplication::UnicodeUTF8));  
为 first\_page->setText(QApplication::translate("Form2", "|<", 0));

13.报错 error This file requires compiler and library support for the ISO C++ 2011 standard.  
在工程文件（pro）中加入：QMAKE\_CXXFLAGS += -std=c++0x

14.报错 error: ‘ERANGE’ was not declared in this scope  
=======================================================================================

[https://stackoverflow.com/questions/25788614/ulong-max-was-not-declared-in-this-scope][https_stackoverflow.com_questions_25788614_ulong-max-was-not-declared-in-this-scope]  
string\_conversion.h  
67 else if (errno == 34//ERANGE

15.报错 error: ‘sa\_family\_t’ was  
can.h 添加  
typedef unsigned short int sa\_family\_t;

参考：  
http://wiki.qt.io/Transition\_from\_Qt\_4.x\_to\_Qt5\#846d0d314d8d4894bde364f45acf02e4

[https_stackoverflow.com_questions_25788614_ulong-max-was-not-declared-in-this-scope]: https://stackoverflow.com/questions/25788614/ulong-max-was-not-declared-in-this-scope