Qt / C ++将QString转换为十进制 [英] Qt/C++ Convert QString to Decimal

问题描述

如何将QString转换为十进制？

How Can I convert QString to decimal ?

在C＃代码中，它如下所示：

In C# code it look like that:

public static decimal ConvertToDecimal(string tekst, bool upperOnly)
{
decimal num = 0m;
decimal num2 = 1m;
string text = upperOnly ? "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ" : "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234";
int i = tekst.Length - 1;
while (i >= 0)
{
    num += text.IndexOf(tekst[i]) * num2;
    i--;
    num2 *= text.Length;
}
return num;
}

推荐答案

http://doc-snapshot.qt-project.org/qdoc/qstring.html#toInt =nofollow>文档：

As per documentation:

int QString :: toInt（bool * ok = 0，int base = 10）const

int QString::toInt(bool * ok = 0, int base = 10) const

返回使用基本库转换为int的字符串，默认为10，必须在2和36之间，或0.如果转换失败，则返回0.

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

如果发生转换错误，假;

If a conversion error occurs, *ok is set to false; otherwise *ok is set to true.

如果base为0，则使用C语言约定：如果字符串以0x开头，则使用base 16;如果字符串以0开头，则使用base 8;

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.

字符串转换将始终在C语言环境中进行。对于区域设置依赖转换使用QLocale :: toInt（）

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

示例：

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

请注意，根据您的具体用例，也不妨查看以下文档：

Note that depending on your exact use case, you may wish to look into the following documentations as well:

long QString :: toLong（bool * ok = 0，int base = 10）const

qlonglong QString :: toLongLong（bool * ok = 0，int base = 10）const

double QString :: toDouble（bool * ok = 0）const

float QString :: toFloat（bool * ok = 0）const

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