C++各种类型的转换string，QString，char*， BYTE等等

总结一下刚刚写的程序中的C++各种类型的转换string，QString，char*， BYTE等等

 

由于我采用Qt来写的界面，所以用到了QString类型

 

1. QString和string的相互转换

 

//------------------------
// QString and string change
//------------------------
QString s2q(const string &s)
{
    return QString(QString::fromLocal8Bit(s.c_str()));
}
string q2s(const QString &s)
{
    return string((const char *)s.toLocal8Bit());
}

//------------------------
// QString and string change
//------------------------
QString s2q(const string &s)
{
    return QString(QString::fromLocal8Bit(s.c_str()));
}
string q2s(const QString &s)
{
    return string((const char *)s.toLocal8Bit());
}

 

2. QString to Char*

QString data;
data.toLatin1().data();

QString data;
data.toLatin1().data();

 

3. char to number

int char2num(char ch)
{
    if(ch>='0'&&ch<='9')return ch-'0';
    else if(ch>='a'&&ch<='f')return ch-'a'+10;
    return -1;
}

int char2num(char ch)
{
    if(ch>='0'&&ch<='9')return ch-'0';
    else if(ch>='a'&&ch<='f')return ch-'a'+10;
    return -1;
}

 

4. number to QString

QString::number(number,10);//10表示的是进制，如是16进制，则改为16

QString::number(number,10);//10表示的是进制，如是16进制，则改为16

 

5. uint8_t to QString

uint8_t Message_Digest;
QString::number(Message_Digest,16);

uint8_t Message_Digest;
QString::number(Message_Digest,16);

 

6. BYTE* to char[] to QString

QString textshow = NULL;
BYTE * output = new BYTE[1024];
for(int i=0; i<16; i++)
{
    char pBuff[2];
    sprintf(pBuff,"%02x",output[i]);
    textshow = textshow + pBuff;
}

QString textshow = NULL;
BYTE * output = new BYTE[1024];
for(int i=0; i<16; i++)
{
    char pBuff[2];
    sprintf(pBuff,"%02x",output[i]);
    textshow = textshow + pBuff;
}

 

7. string to BYTE []  //其中#define unsigned char  BYTE

////-------------------------------------------
//// 将字符串类型转换为BYTE数组
////-------------------------------------------
void CryptClient::HexStrToByte(string str_arr, BYTE byte_arr[24])
{
    unsigned char ch1;
    unsigned char ch2;
    int k = 0;
    for (int i=0; i<str_arr.length()-1; i = i+2)
    {
        ch1 = str_arr.at(i);
        ch2 = str_arr.at(i+1);
        if (ch1>=48 && ch1 <= 57)
        {
            ch1 &= 0x0F;
        }
        if (ch1>='A' && ch1 <='F')
        {
            ch1 &= 0x0F;
            ch1 += 0x09;
        }
        if (ch2 >= 48 && ch2 <= 57)
        {
            ch2 &= 0x0F;
        }
        if (ch2>='A' && ch2 <='F')
        {
            ch2 &= 0x0F;
            ch2 += 0x09;
        }
        ch1<<=4;
        byte_arr[k] = ch1 + ch2;//int类型转byte类型，有问题
        k++;
    }
}

////-------------------------------------------
//// 将字符串类型转换为BYTE数组
////-------------------------------------------
void CryptClient::HexStrToByte(string str_arr, BYTE byte_arr[24])
{
    unsigned char ch1;
    unsigned char ch2;
    int k = 0;
    for (int i=0; i<str_arr.length()-1; i = i+2)
    {
        ch1 = str_arr.at(i);
        ch2 = str_arr.at(i+1);
        if (ch1>=48 && ch1 <= 57)
        {
            ch1 &= 0x0F;
        }
        if (ch1>='A' && ch1 <='F')
        {
            ch1 &= 0x0F;
            ch1 += 0x09;
        }
        if (ch2 >= 48 && ch2 <= 57)
        {
            ch2 &= 0x0F;
        }
        if (ch2>='A' && ch2 <='F')
        {
            ch2 &= 0x0F;
            ch2 += 0x09;
        }
        ch1<<=4;
        byte_arr[k] = ch1 + ch2;//int类型转byte类型，有问题
        k++;
    }
}

 

8. BYTE[] to string //上个过程的逆过程

////-------------------------------------------
//// 将BYTE数组转换为字符串类型
////-------------------------------------------
string* byteToHexStr(BYTE byte_arr[], int arr_len)
{
    string* hexstr = new string;
    for(int i=0; i<arr_len; i++)
    {
        char hex1;
        char hex2;
        int value = byte_arr[i];
        int v1 = value/16;
        int v2 = value % 16;
        //将商转换为字母
        if (v1>=0 && v1<=9)
        {
            hex1 = (char)(48 + v1);
        }
        else
        {
            hex1 = (char)(55 + v1);
        }
        //将余数转成字母
        if (v2>=0 && v2<=9)
        {
            hex2 = (char)(48 + v2);
        }
        else
        {
            hex2 = (char)(55 + v2);
        }
        //将字母连成一串
        *hexstr = *hexstr + hex1 + hex2;
    }
    return hexstr;
}

////-------------------------------------------
//// 将BYTE数组转换为字符串类型
////-------------------------------------------
string* byteToHexStr(BYTE byte_arr[], int arr_len)
{
    string* hexstr = new string;
    for(int i=0; i<arr_len; i++)
    {
        char hex1;
        char hex2;
        int value = byte_arr[i];
        int v1 = value/16;
        int v2 = value % 16;
        //将商转换为字母
        if (v1>=0 && v1<=9)
        {
            hex1 = (char)(48 + v1);
        }
        else
        {
            hex1 = (char)(55 + v1);
        }
        //将余数转成字母
        if (v2>=0 && v2<=9)
        {
            hex2 = (char)(48 + v2);
        }
        else
        {
            hex2 = (char)(55 + v2);
        }
        //将字母连成一串
        *hexstr = *hexstr + hex1 + hex2;
    }
    return hexstr;
}

 

9. char* to QString

QString keyall1;
char keych1[MAX_NUM];
keyall1 = QString(QLatin1String(keych1));

QString keyall1;
char keych1[MAX_NUM];
keyall1 = QString(QLatin1String(keych1));