如何将字符串更改为QString? [英] How to change string into QString?
问题描述
最基本的方法是什么?
推荐答案
如果按字符串表示 std :: string
,您可以使用此方法:
If by string you mean std::string
you can do it with this method:
QString QString :: fromStdString(const std :: string& str)
std::string str = "Hello world";
QString qstr = QString::fromStdString(str);
如果按字符串表示Ascii编码 const char *
那么你可以使用这个方法:
If by string you mean Ascii encoded const char *
then you can use this method:
QString QString :: fromAscii(const char * str,int size = -1)
const char* str = "Hello world";
QString qstr = QString::fromAscii(str);
如果您有 const char *
使用系统编码进行编码,可以使用 QTextCodec :: codecForLocale() ,那么您应该使用此方法:
If you have const char *
encoded with system encoding that can be read with QTextCodec::codecForLocale() then you should use this method:
QString QString :: fromLocal8Bit(const char * str,int size = -1)
const char* str = "zażółć gęślą jaźń"; // latin2 source file and system encoding
QString qstr = QString::fromLocal8Bit(str);
如果您有 const char *
的UTF8编码,那么您需要使用此方法:
If you have const char *
that's UTF8 encoded then you'll need to use this method:
QString QString :: fromUtf8(const char * str,int size = -1)
const char* str = read_raw("hello.txt"); // assuming hello.txt is UTF8 encoded, and read_raw() reads bytes from file into memory and returns pointer to the first byte as const char*
QString qstr = QString::fromUtf8(str);
包含UTF16编码字符串的const ushort *
:
QString QString :: fromUtf16(const ushort * unicode,int size = -1)
const ushort* str = read_raw("hello.txt"); // assuming hello.txt is UTF16 encoded, and read_raw() reads bytes from file into memory and returns pointer to the first byte as const ushort*
QString qstr = QString::fromUtf16(str);
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