int QString::toInt(bool *ok = Q_NULLPTR, int base = 10) const

以下为官方文档：

int QString::toInt(bool *ok = Q_NULLPTR,intbase = 10) const

Returns the string converted to anint using base base, which is 10 by default and must be between 2 and 36, or 0. Returns 0 if the conversion fails.

If a conversion error occurs, *ok is set tofalse; otherwise *ok is set totrue.

If base is 0, the C language convention is used: If the string begins with "0x", base 16 is used; if the string begins with "0", base 8 is used; otherwise, base 10 is used.

The string conversion will always happen in the 'C' locale. For locale dependent conversion useQLocale::toInt()

Example:

  QString str = "FF";

  bool ok;

  int hex = str.toInt(&ok, 16);       // hex == 255, ok == true

  int dec = str.toInt(&ok, 10);       // dec == 0, ok == false

我认为转换之前会进行类型检测，如果无法转换，OK变为0，返回值为0，同时ok一直为0，我们也可以在后续去判断

反之为1，转换成功