Conversion between common data in QT

In fact, this online has a lot of, write here, just give yourself a record, lest later find not full, or 1:30 will not find what they want. Keep up with the new ...

1. int, float, double turn into qstring

Method 1. Use Qstring::number ();

Long A = 63;

QString s = Qstring::number (A, 10); s = = "63"

QString t = Qstring::number (A, +). ToUpper (); t = = "3F"

Method 2. Use ARG ()

Long A = 63;

QString s = QString ("%1"). Arg (a);

This is handy for turning floating point numbers into qstring types.

2. Convert qstring to double type

Method 1. Using ToDouble ()

QString str= "123.45";

Double val=str.todouble (); val=123.45

Method 2. Very suitable for scientific counting method form Conversion

BOOL OK;

Double D;

D=qstring ("1234.56e-02"). ToDouble (&ok); ok=true;d;12.3456.

3. Convert the qstring to float

Method 1. Using Tofloat ()

QString str= "123.45";

float d=str.tofloat (); d=123.45

4. Convert the qstring shape to int

1. Converting to decimal shaping

Note: The cardinality defaults to 10. When the cardinality is 10 o'clock, and the cardinality must be between 2 and 36. If the cardinality is 0, if the string starts with 0x, it will be converted to 16, and if it starts with a 0, it is converted to octal, otherwise it will be converted to decimal.

Qstring str= "FF";

BOOL OK;

int Dec=str.toint (&ok,10); dec=255; Ok=rue

int hex =str.toint (&ok,16); Hex=255;ok=true;

5. Long plastic conversion to qstring shape

Long A = 63;

QString Str=qstring::number (a,16); Str= "3f";

QString Str=qstring::number (a,16). ToUpper (); Str= "3F";

6. Qstring Conversion char*

Method One:

QString qstr ("Hello,word");

const char * p = qstr.tolocal8bit (). data ();

Method Two:

const char *p = qstr.tostdstring (). data ();

Some other conversion requirements:

convert current time to qstring ...

Public Qdatetime qdate = Qdatetime.currentdatetime ();

datetime = qdate.tostring ("yyyy mm month DD Day Ddddhh:mm:ss");

If not qtime and Qdate classes such as: How to convert a char unsigned char class received via TCP/IP to a qstring class

QString time2string (DWORD dwtime)

{

Char ctime[50] = {0};

memset (ctime,0,50);

Strftime (ctime,32, "%y-%m-%d%h:%m:%s", LocalTime (&time_t (Dwtime)));

Return QString (CTime);

}

Conversion between common data in QT