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這篇文章主要講解了“Qt函數體怎么使用”，文中的講解內容簡單清晰，易于學習與理解，下面請大家跟著小編的思路慢慢深入，一起來研究和學習“Qt函數體怎么使用”吧！
//字節數組轉Ascii字符串 static QString byteArrayToAsciiStr(const QByteArray &data); //16進制字符串轉字節數組 static QByteArray hexStrToByteArray(const QString &str); static char convertHexChar(char ch); //Ascii字符串轉字節數組 static QByteArray asciiStrToByteArray(const QString &str); //字節數組轉16進制字符串 static QString byteArrayToHexStr(const QByteArray &data);
QString QUIHelper::byteArrayToAsciiStr(const QByteArray &data)
{
QString temp;
int len = data.size();
for (int i = 0; i < len; i++) {
//0x20為空格,空格以下都是不可見字符
char b = data.at(i);
if (0x00 == b) {
temp += QString("\\NUL");
} else if (0x01 == b) {
temp += QString("\\SOH");
} else if (0x02 == b) {
temp += QString("\\STX");
} else if (0x03 == b) {
temp += QString("\\ETX");
} else if (0x04 == b) {
temp += QString("\\EOT");
} else if (0x05 == b) {
temp += QString("\\ENQ");
} else if (0x06 == b) {
temp += QString("\\ACK");
} else if (0x07 == b) {
temp += QString("\\BEL");
} else if (0x08 == b) {
temp += QString("\\BS");
} else if (0x09 == b) {
temp += QString("\\HT");
} else if (0x0A == b) {
temp += QString("\\LF");
} else if (0x0B == b) {
temp += QString("\\VT");
} else if (0x0C == b) {
temp += QString("\\FF");
} else if (0x0D == b) {
temp += QString("\\CR");
} else if (0x0E == b) {
temp += QString("\\SO");
} else if (0x0F == b) {
temp += QString("\\SI");
} else if (0x10 == b) {
temp += QString("\\DLE");
} else if (0x11 == b) {
temp += QString("\\DC1");
} else if (0x12 == b) {
temp += QString("\\DC2");
} else if (0x13 == b) {
temp += QString("\\DC3");
} else if (0x14 == b) {
temp += QString("\\DC4");
} else if (0x15 == b) {
temp += QString("\\NAK");
} else if (0x16 == b) {
temp += QString("\\SYN");
} else if (0x17 == b) {
temp += QString("\\ETB");
} else if (0x18 == b) {
temp += QString("\\CAN");
} else if (0x19 == b) {
temp += QString("\\EM");
} else if (0x1A == b) {
temp += QString("\\SUB");
} else if (0x1B == b) {
temp += QString("\\ESC");
} else if (0x1C == b) {
temp += QString("\\FS");
} else if (0x1D == b) {
temp += QString("\\GS");
} else if (0x1E == b) {
temp += QString("\\RS");
} else if (0x1F == b) {
temp += QString("\\US");
} else if (0x7F == b) {
temp += QString("\\x7F");
} else if (0x5C == b) {
temp += QString("\\x5C");
} else if (0x20 >= b) {
temp += QString("\\x%1").arg(decimalToStrHex((quint8)b));
} else {
temp += QString("%1").arg(b);
}
}
return temp.trimmed();
}
QByteArray QUIHelper::hexStrToByteArray(const QString &str)
{
QByteArray senddata;
int hexdata, lowhexdata;
int hexdatalen = 0;
int len = str.length();
senddata.resize(len / 2);
char lstr, hstr;
for (int i = 0; i < len;) {
hstr = str.at(i).toLatin1();
if (hstr == ' ') {
i++;
continue;
}
i++;
if (i >= len) {
break;
}
lstr = str.at(i).toLatin1();
hexdata = convertHexChar(hstr);
lowhexdata = convertHexChar(lstr);
if ((hexdata == 16) || (lowhexdata == 16)) {
break;
} else {
hexdata = hexdata * 16 + lowhexdata;
}
i++;
senddata[hexdatalen] = (char)hexdata;
hexdatalen++;
}
senddata.resize(hexdatalen);
return senddata;
}
char QUIHelper::convertHexChar(char ch)
{
if ((ch >= '0') && (ch <= '9')) {
return ch - 0x30;
} else if ((ch >= 'A') && (ch <= 'F')) {
return ch - 'A' + 10;
} else if ((ch >= 'a') && (ch <= 'f')) {
return ch - 'a' + 10;
} else {
return (-1);
}
}
QByteArray QUIHelper::asciiStrToByteArray(const QString &str)
{
QByteArray buffer;
int len = str.length();
QString letter;
QString hex;
for (int i = 0; i < len; i++) {
letter = str.at(i);
if (letter == "\\") {
i++;
letter = str.mid(i, 1);
if (letter == "x") {
i++;
hex = str.mid(i, 2);
buffer.append(strHexToDecimal(hex));
i++;
continue;
} else if (letter == "N") {
i++;
hex = str.mid(i, 1);
if (hex == "U") {
i++;
hex = str.mid(i, 1);
if (hex == "L") { //NUL=0x00
buffer.append((char)0x00);
continue;
}
} else if (hex == "A") {
i++;
hex = str.mid(i, 1);
if (hex == "K") { //NAK=0x15
buffer.append(0x15);
continue;
}
}
} else if (letter == "S") {
i++;
hex = str.mid(i, 1);
if (hex == "O") {
i++;
hex = str.mid(i, 1);
if (hex == "H") { //SOH=0x01
buffer.append(0x01);
continue;
} else { //SO=0x0E
buffer.append(0x0E);
i--;
continue;
}
} else if (hex == "T") {
i++;
hex = str.mid(i, 1);
if (hex == "X") { //STX=0x02
buffer.append(0x02);
continue;
}
} else if (hex == "I") { //SI=0x0F
buffer.append(0x0F);
continue;
} else if (hex == "Y") {
i++;
hex = str.mid(i, 1);
if (hex == "N") { //SYN=0x16
buffer.append(0x16);
continue;
}
} else if (hex == "U") {
i++;
hex = str.mid(i, 1);
if (hex == "B") { //SUB=0x1A
buffer.append(0x1A);
continue;
}
}
} else if (letter == "E") {
i++;
hex = str.mid(i, 1);
if (hex == "T") {
i++;
hex = str.mid(i, 1);
if (hex == "X") { //ETX=0x03
buffer.append(0x03);
continue;
} else if (hex == "B") { //ETB=0x17
buffer.append(0x17);
continue;
}
} else if (hex == "O") {
i++;
hex = str.mid(i, 1);
if (hex == "T") { //EOT=0x04
buffer.append(0x04);
continue;
}
} else if (hex == "N") {
i++;
hex = str.mid(i, 1);
if (hex == "Q") { //ENQ=0x05
buffer.append(0x05);
continue;
}
} else if (hex == "M") { //EM=0x19
buffer.append(0x19);
continue;
} else if (hex == "S") {
i++;
hex = str.mid(i, 1);
if (hex == "C") { //ESC=0x1B
buffer.append(0x1B);
continue;
}
}
} else if (letter == "A") {
i++;
hex = str.mid(i, 1);
if (hex == "C") {
i++;
hex = str.mid(i, 1);
if (hex == "K") { //ACK=0x06
buffer.append(0x06);
continue;
}
}
} else if (letter == "B") {
i++;
hex = str.mid(i, 1);
if (hex == "E") {
i++;
hex = str.mid(i, 1);
if (hex == "L") { //BEL=0x07
buffer.append(0x07);
continue;
}
} else if (hex == "S") { //BS=0x08
buffer.append(0x08);
continue;
}
} else if (letter == "C") {
i++;
hex = str.mid(i, 1);
if (hex == "R") { //CR=0x0D
buffer.append(0x0D);
continue;
} else if (hex == "A") {
i++;
hex = str.mid(i, 1);
if (hex == "N") { //CAN=0x18
buffer.append(0x18);
continue;
}
}
} else if (letter == "D") {
i++;
hex = str.mid(i, 1);
if (hex == "L") {
i++;
hex = str.mid(i, 1);
if (hex == "E") { //DLE=0x10
buffer.append(0x10);
continue;
}
} else if (hex == "C") {
i++;
hex = str.mid(i, 1);
if (hex == "1") { //DC1=0x11
buffer.append(0x11);
continue;
} else if (hex == "2") { //DC2=0x12
buffer.append(0x12);
continue;
} else if (hex == "3") { //DC3=0x13
buffer.append(0x13);
continue;
} else if (hex == "4") { //DC2=0x14
buffer.append(0x14);
continue;
}
}
} else if (letter == "F") {
i++;
hex = str.mid(i, 1);
if (hex == "F") { //FF=0x0C
buffer.append(0x0C);
continue;
} else if (hex == "S") { //FS=0x1C
buffer.append(0x1C);
continue;
}
} else if (letter == "H") {
i++;
hex = str.mid(i, 1);
if (hex == "T") { //HT=0x09
buffer.append(0x09);
continue;
}
} else if (letter == "L") {
i++;
hex = str.mid(i, 1);
if (hex == "F") { //LF=0x0A
buffer.append(0x0A);
continue;
}
} else if (letter == "G") {
i++;
hex = str.mid(i, 1);
if (hex == "S") { //GS=0x1D
buffer.append(0x1D);
continue;
}
} else if (letter == "R") {
i++;
hex = str.mid(i, 1);
if (hex == "S") { //RS=0x1E
buffer.append(0x1E);
continue;
}
} else if (letter == "U") {
i++;
hex = str.mid(i, 1);
if (hex == "S") { //US=0x1F
buffer.append(0x1F);
continue;
}
} else if (letter == "V") {
i++;
hex = str.mid(i, 1);
if (hex == "T") { //VT=0x0B
buffer.append(0x0B);
continue;
}
} else if (letter == "\\") {
//如果連著的是多個\\則對應添加\對應的16進制0x5C
buffer.append(0x5C);
continue;
} else {
//將對應的\[前面的\\也要加入
buffer.append(0x5C);
buffer.append(letter.toLatin1());
continue;
}
}
buffer.append(str.mid(i, 1).toLatin1());
}
return buffer;
}
QString QUIHelper::byteArrayToHexStr(const QByteArray &data)
{
QString temp = "";
QString hex = data.toHex();
for (int i = 0; i < hex.length(); i = i + 2) {
temp += hex.mid(i, 2) + " ";
}
return temp.trimmed().toUpper();
}感謝各位的閱讀，以上就是“Qt函數體怎么使用”的內容了，經過本文的學習后，相信大家對Qt函數體怎么使用這一問題有了更深刻的體會，具體使用情況還需要大家實踐驗證。這里是億速云，小編將為大家推送更多相關知識點的文章，歡迎關注！
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