1.使用qDebug打印关键信息,在程序输出窗口进行查看,如:
void QtAppDebug::on_pushButton_clicked()
{
qDebug() << "---QtAppDebug---" << endl;
}
2.使用QMessageBox显示关键信息,在程序运行过程中通过窗口查看,如:
void QtAppDebug::on_pushButton_clicked()
{
QMessageBox::information(this,"Test","---QtAppDebug---");
}
3.对可疑代码进行注释,按模块函数顺序逐步缩小范围,精准定位出bug代码,如:
void QtAppDebug::on_pushButton_clicked()
{
#if 0
QMessageBox::information(this,"Test","---QtAppDebug---");
#endif
}
4.qtcreator使用F10,F11,F5进行单步调试,查看程序运行过程中关键数据信息;
5.打印调试信息到日志文件中进行分析,使用示例,更全面系统日志框架可学习Log4Qt ;
6.调试复杂界面显示时,可以设置控件颜色清晰查看控件大小及边界,如下:
void QtAppDebug::on_pushButton_clicked()
{
ui->pushButton->setStyleSheet("background-color:red");
}
7.添加异常捕获代码,崩溃时生成dump文件,根据dump文件进行分析定位,如下:
//异常捕获函数
long ApplicationCrashHandler(EXCEPTION_POINTERS *pException){
{
// 在程序exe的上级目录中创建dmp文件夹
QDir *dmp = new QDir;
bool exist = dmp->exists("../dmp/");
if(exist == false)
dmp->mkdir("../dmp/");
}
QDateTime current_date_time = QDateTime::currentDateTime();
QString current_date = current_date_time.toString("yyyy_MM_dd_hh_mm_ss");
QString time = current_date + ".dmp";
EXCEPTION_RECORD *record = pException->ExceptionRecord;
QString errCode(QString::number(record->ExceptionCode, 16));
QString errAddr(QString::number((uint)record->ExceptionAddress, 16));
QString errFlag(QString::number(record->ExceptionFlags, 16));
QString errPara(QString::number(record->NumberParameters, 16));
qDebug()<<"errCode: "<<errCode;
qDebug()<<"errAddr: "<<errAddr;
qDebug()<<"errFlag: "<<errFlag;
qDebug()<<"errPara: "<<errPara;
HANDLE hDumpFile = CreateFile((LPCSTR)QString("../dmp/" + time).utf16(),
GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
if(hDumpFile != INVALID_HANDLE_VALUE) {
MINIDUMP_EXCEPTION_INFORMATION dumpInfo;
dumpInfo.ExceptionPointers = pException;
dumpInfo.ThreadId = GetCurrentThreadId();
dumpInfo.ClientPointers = TRUE;
MiniDumpWriteDump(GetCurrentProcess(), GetCurrentProcessId(),hDumpFile, MiniDumpNormal, &dumpInfo, NULL, NULL);
CloseHandle(hDumpFile);
}
else{
qDebug()<<"hDumpFile == null";
}
return EXCEPTION_EXECUTE_HANDLER;
}```
//注冊异常捕获函数
SetUnhandledExceptionFilter((LPTOP_LEVEL_EXCEPTION_FILTER)ApplicationCrashHandler);