1、每两个字符加一个空格
QString MainWindow::AddSpaceToStr(QString source_str)
{
QString result_str = "";//返回带有空格的字符串
int source_str_length = source_str.length();
for(int i=0;i<source_str_length;i++)
{
result_str += source_str.mid(i,2);
result_str += " ";
i++;
}
return result_str;
}
2、将QString转化到QByteArray里面//此方法不适用，其实有更好的方法
QByteArray MainWindow::StrToHex(QString packet_str,QByteArray dataArray)
{
int dataCount = 0;//字节数组地址
int packetLength = packet_str.length();//发送内容的字符数
int dataLength = 0;//字节数组的长度
dataLength = packetLength/2;//字符数除以2
if(packetLength%2 != 0)//如果为奇数
dataLength++;
dataArray.resize(dataLength);//设置字节数组的长度
QString tempStr = "";
for(int i=0;i<packetLength;i++)//通过此循环将发送内容每两个字符转化为一个字节十六进制,存在字节数组里面
{
bool ok;
tempStr = packet_str.mid(i,2);
dataArray[dataCount++] = (uchar)tempStr.toInt(&ok,16);
i++;
}
return dataArray;
}
QString dataStr = ui->textEdit->toPlainText();
dataStr = dataStr.replace(" ","");
QByteArray ba = QByteArray::fromHex(dataStr.toLatin1());
3、QString转const char
#include <iostream>//需要使用std
QString tempFileName;std::string str = tempFileName.toStdString();//标准库的string
const char* ch = str.c_str();//ch就是const char
4、获取时间格式：年-月-日-时-分-秒
QTime currentTime = QTime::currentTime();
QString timeStr = "--->" + QString::number(currentDate.year()) + "-";//年
timeStr += QString::number(currentDate.month()) + "-";//月
timeStr += QString::number(currentDate.day()) + "-";//日
timeStr += QString::number(currentTime.hour()) + "-";//时
timeStr += QString::number(currentTime.minute()) + "-";//分
timeStr += QString::number(currentTime.second());//秒
QDateTime current_date_time = QDateTime::currentDateTime();
QString current_date = current_date_time.toString("yyyy-MM-dd");
QString current_time = current_date_time.toString("hh:mm:ss.zzz ");
5、字符数组转十六进制字符串char{0x00,0x01}->QString(00 01)
QString MyMethod::uchar2Str(uchar *sourceChar, int length)
{
QByteArray ba;ba.resize(length);
memcpy(ba.data(),sourceChar,length);
QString resultStr = ba.toHex();
resultStr = MyMethod::formatStr(resultStr);
return resultStr;
}
6、打印CAN错误码
void MainWindow::printCanErrCode()
{
QString tempStr;VCI_ERR_INFO err_info;
VCI_ReadErrInfo(this->DevType,this->DevIndex,this->CanIndex,&err_info);
tempStr = QString::number(err_info.ErrCode);
QMessageBox::warning(this,"打开设备","操作失败
错误代码:"+tempStr);
}
7、设置本地的QSS文件
QString MainWindow::getQssContent()
{
QFile styleSheet("F:\QtSpace\MyCanTest\test.txt");
if (!styleSheet.open(QIODevice::ReadOnly))
{
qDebug()<<"Can't open the style sheet file.";
return "";
}
return styleSheet.readAll();}
8、根据5个串口配置combobox，获取串口配置结构体1）、串口配置结构体定义
typedef struct
{
QString portName;//串口号
QSerialPort::BaudRate baudRate;//波特率
QSerialPort::DataBits dataBits;//数据位
QSerialPort::Parity parity;//校验位
QSerialPort::StopBits stopBites;//停止位
}SerialportInfo;
2）、根据5个combobox返回此结构体
SerialportInfo MainWindow::getSerialportInfo(QComboBox* cb1,QComboBox* cb2,QComboBox* cb3,QComboBox* cb4,QComboBox* cb5)
{
SerialportInfo serialPortInfo;
/*串口名字*/
serialPortInfo.portName = cb1->currentText();//串口名字
/*波特率*/
if("1200"==cb2->currentText())
{
serialPortInfo.baudRate = QSerialPort::Baud1200;
}
else if("2400"==cb2->currentText())
{
serialPortInfo.baudRate = QSerialPort::Baud2400;
}
else if("4800"==cb2->currentText())
{
serialPortInfo.baudRate = QSerialPort::Baud4800;
}
else if("9600"==cb2->currentText())
{
serialPortInfo.baudRate = QSerialPort::Baud9600;
}
else if("19200"==cb2->currentText())
{
serialPortInfo.baudRate = QSerialPort::Baud19200;
}
else if("38400"==cb2->currentText())
{
serialPortInfo.baudRate = QSerialPort::Baud38400;
}
else if("57600"==cb2->currentText())
{
serialPortInfo.baudRate = QSerialPort::Baud57600;
}
else if("115200"==cb2->currentText())
{
serialPortInfo.baudRate = QSerialPort::Baud115200;
}
/*数据位*/
if(0==cb3->currentIndex())
{
serialPortInfo.dataBits = QSerialPort::Data8;
}
else if(1==cb3->currentIndex())
{
serialPortInfo.dataBits = QSerialPort::Data7;
}
else if(2==cb3->currentIndex())
{
serialPortInfo.dataBits = QSerialPort::Data6;
}
else if(3==cb3->currentIndex())
{
serialPortInfo.dataBits = QSerialPort::Data5;
}
/*校验位*/
if("NONE"==cb4->currentText())
{
serialPortInfo.parity = QSerialPort::NoParity;
}
else if("ODD"==cb4->currentText())
{
serialPortInfo.parity = QSerialPort::OddParity;
}
else if("EVEN"==cb4->currentText())
{
serialPortInfo.parity = QSerialPort::EvenParity;
}
else if("MARK"==cb4->currentText())
{
serialPortInfo.parity = QSerialPort::MarkParity;
}
else if("SPACE"==cb4->currentText())
{
serialPortInfo.parity = QSerialPort::SpaceParity;
}
/*停止位*/
if(0==cb5->currentIndex())
{
serialPortInfo.stopBites = QSerialPort::OneStop;
}
else if(1==cb5->currentIndex())
{
serialPortInfo.stopBites = QSerialPort::OneAndHalfStop;
}
else if(2==cb5->currentIndex())
{
serialPortInfo.stopBites = QSerialPort::TwoStop;
}
return serialPortInfo;
}
9、QString("FF")转BYTE(FF)
BYTE MyMethod::hexToByte(QString info)
{
return (BYTE)info.toUInt(NULL,16);
}
10、根据年月日得到是否为工作日
int CaculateWeekDay(int y, int m, int d) { if(m==1||m==2) //把一月和二月换算成上一年的十三月和是四月 { m+=12; y--; } int Week=(d+2*m+3*(m+1)/5+y+y/4-y/100+y/400)%7; switch(Week) { case 0: return WORKDAY;/*cout << "是星期一" << endl;*/ break; case 1: return WORKDAY;/*cout << "是星期二" << endl;*/ break; case 2: return WORKDAY;/*cout << "是星期三" << endl;*/ break; case 3: return WORKDAY;/*cout << "是星期四" << endl;*/ break; case 4: return WORKDAY;/*cout << "是星期五" << endl;*/ break; case 5: return NOTWORKDAY;/*cout << "是星期六" << endl;*/ break; case 6: return NOTWORKDAY;/*cout << "是星期日" << endl;*/ break; default:return ERRORDAY; } return ERRORDAY; }
11、从数据流中找出数据包
static QByteArray allBa;//用来存所有文件 allBa.append(tcpClient->readAll());//读取数据 int head = allBa.indexOf(HEAD);//报文头的位置 uint16_t length = 0;//存长度字节 QByteArray currentBa; int id = 0; while (-1 != head) { allBa = allBa.mid(head);//去掉报头之前的 memcpy(&length, allBa.data() + 2, 2); if (allBa.size() >= length)//长度够,进行解析 { currentBa = allBa.mid(0, length);//获取当前完成包 id = Mymethod::getPacketType(currentBa); if (-1 != id) { emit getPacketSignal(id, currentBa); qDebug() << "接收指令:" << currentBa.toHex().toUpper(); }
allBa = allBa.mid(length);
} else { break; } head = allBa.indexOf(HEAD);//刷新报文头的位置 }
12、获取随机字符串
void Mysqltool::setRandString(QString & randString) { int max = 8; QString tmp = QString("0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWZYZ"); QString str; QTime t; t= QTime::currentTime(); qsrand(t.msec()+t.second()*1000); for(int i=0;i<max;i++) { int ir = qrand()%tmp.length(); str[i] = tmp.at(ir); } randString = str; }
13、判断一个值是否在一个范围内，范围用字符串表示
范围示例：
bool Mymethod::isValueInRange(float value, QString rangeStr) { bool ret = false; if(rangeStr=="[0.5,0.7)|(1.3,1.5]") { qDebug()<<"test"; } //布尔判断 if(!rangeStr.contains("(") && !rangeStr.contains("[") && !rangeStr.contains(",") && !rangeStr.contains("|")) { if(rangeStr.toDouble() == value) { ret = true; } } //判断枚举 else if(!rangeStr.contains("(") && !rangeStr.contains("[") && rangeStr.contains(",")) { QString str = QString::number(value); if(rangeStr.contains(str)) { ret = true; } } //判断单区间 else if((rangeStr.contains("(") || rangeStr.contains("[")) && rangeStr.contains(",") && !rangeStr.contains("|")) { QString left, right;//[342,418] if(rangeStr.contains("(") && rangeStr.contains(")")) { int pos = rangeStr.indexOf(","); left = rangeStr.left(pos).remove("("); right = rangeStr.remove(0, pos+1).remove(")"); if(left == "~" && right == "~") { ret = true; } else if(left == "~" && right != "~") { if(value < right.toDouble()) { ret = true; } } else if(left != "~" && right == "~") { if(value > left.toDouble()) { ret = true; } } else { if(value > left.toDouble() && value < right.toDouble()) { ret = true; } } } if(rangeStr.contains("[")&&rangeStr.contains("]")) { int pos = rangeStr.indexOf(","); left = rangeStr.left(pos).remove("["); right = rangeStr.remove(0, pos+1).remove("]"); if(value >= left.toDouble() && value <= right.toDouble()) { ret = true; } } if(rangeStr.contains("(")&&rangeStr.contains("]")) { int pos = rangeStr.indexOf(","); left = rangeStr.left(pos).remove("("); right = rangeStr.remove(0, pos+1).remove("]"); if(left == "~" && right != "~") { if(value <= right.toDouble()) { ret = true; } } else if(left != "~" && right != "~") { if(value > left.toDouble() && value <= right.toDouble()) { ret = true; } } } if(rangeStr.contains("[")&&rangeStr.contains(")")) { int pos = rangeStr.indexOf(","); left = rangeStr.left(pos).remove("["); right = rangeStr.remove(0, pos+1).remove(")"); if(left != "~" && right == "~") { if(value >= left.toDouble()) { ret = true; } } else if(left != "~" && right != "~") { if(value >= left.toDouble() && value < right.toDouble()) { ret = true; } } } } // 判断多区间 else if(rangeStr.contains("|")) { QString left; QString l_left, l_right; int pos = rangeStr.indexOf("|"); while(pos != -1) { left = rangeStr.left(pos); int lpos = left.indexOf(","); if(left.contains("(") && left.contains(")")) { l_left = left.left(lpos).remove("("); l_right = left.remove(0, lpos+1).remove(")"); if(l_left == "~" && l_right == "~") { ret = true; } else if(l_left == "~" && l_right != "~") { if(value < l_right.toDouble()) { ret = true; } } else if(l_left != "~" && l_right == "~") { if(value > l_left.toDouble()) { ret = true; } } else { if(value > l_left.toDouble() && value < l_right.toDouble()) { ret = true; } } } if(left.contains("[") && left.contains("]")) { l_left = left.left(lpos).remove("["); l_right = left.remove(0, lpos+1).remove("]"); if(value >= l_left.toDouble() && value <= l_right.toDouble()) { ret = true; } } if(left.contains("(") && left.contains("]")) { l_left = left.left(lpos).remove("("); l_right = left.remove(0, lpos+1).remove("]"); if(l_left == "~" && l_right != "~") { if(value <= l_right.toDouble()) { ret = true; } } else if(l_left != "~" && l_right != "~") { if(value > l_left.toDouble() && value <= l_right.toDouble()) { ret = true; } } } if(left.contains("[") && left.contains(")")) { l_left = left.left(lpos).remove("["); l_right = left.remove(0, lpos+1).remove(")"); if(l_left != "~" && l_right == "~") { if(value >= l_left.toDouble()) { ret = true; } } else if(l_left != "~" && l_right != "~") { if(value >= l_left.toDouble() && value < l_right.toDouble()) { ret = true; } } } rangeStr.remove(0, pos+1); pos = rangeStr.indexOf("|"); } if(rangeStr.contains("(")&&rangeStr.contains(")")) { pos = rangeStr.indexOf(","); l_left = rangeStr.left(pos).remove("("); l_right = rangeStr.remove(0,pos+1).remove(")"); if(l_left == "~" && l_right == "~") { ret = true; } else if(l_left == "~" && l_right != "~") { if(value < l_right.toDouble()) { ret = true; } } else if(l_left != "~" && l_right == "~") { if(value > l_left.toDouble()) { ret = true; } } else { if(value > l_left.toDouble() && value < l_right.toDouble()) { ret = true; } } } if(rangeStr.contains("[")&&rangeStr.contains("]")) { int pos = rangeStr.indexOf(","); l_left = rangeStr.left(pos).remove("["); l_right = rangeStr.remove(0, pos+1).remove("]"); if(value >= l_left.toDouble() && value <= l_right.toDouble()) { ret = true; } } if(rangeStr.contains("(")&&rangeStr.contains("]")) { int pos = rangeStr.indexOf(","); l_left = rangeStr.left(pos).remove("("); l_right = rangeStr.remove(0, pos+1).remove("]"); if(l_left == "~" && l_right != "~") { if(value <= l_right.toDouble()) { ret = true; } } else if(l_left != "~" && l_right != "~") { if(value > l_left.toDouble() && value <= l_right.toDouble()) { ret = true; } } } if(rangeStr.contains("[")&&rangeStr.contains(")")) { int pos = rangeStr.indexOf(","); l_left = rangeStr.left(pos).remove("["); l_right = rangeStr.remove(0, pos+1).remove(")"); if(l_left != "~" && l_right == "~") { if(value >= l_left.toDouble()) { ret = true; } } else if(l_left != "~" && l_right != "~") { if(value >= l_left.toDouble() && value < l_right.toDouble()) { ret = true; } } } } return ret; }