如何将QString转换为char *或者相反

Posted 2023-03-13

参考技术A 注：如下方法应该是qt3.0的，一些方法大同小异，请参考qt4的类文档说明。How can I convert a QString to char* and vice versa ?(trolltech)Answer:In order to convert a QString to a char*, then you first need to get a latin1 representation of the string by calling toLatin1() on it which will return a QByteArray. Then call data() on the QByteArray to get a pointer to the data stored in the byte array. See the documentation:See the following example for a demonstration:int main(int argc, char **argv)QApplication app(argc, argv);QString str1 = "Test";QByteArray ba = str1.toLatin1();const char *c_str2 = ba.data();printf("str2: %s", c_str2);return app.exec();Note that it is necessary to store the bytearray before you call data() on it, a call like the followingconst char *c_str2 = str2.toLatin1().data();will make the application crash as the QByteArray has not been stored and hence no longer exists.To convert a char* to a QString you can use the QString constructor that takes a QLatin1String, e.g:QString string = QString(QLatin1String(c_str2)) ;还有其他多种方法：方法一 -----------------------------------------#define G2U(s) ( QTextCodec::codecForName("GBK")->toUnicode(s) )#define U2G(s) ( QTextCodec::codecForName("GBK")->fromUnicode(s) )QString str;QCString cstr;str = G2U("中文输入");cstr = U2G(str);QCString有这样一个重载运算符operator const char * () const可以这样printf("%s\n", (const char*) cstr);或是copy出来char buf[1024];strcpy(buf, (const char*) cstr);方法二 -----------------------------------------如果是中文系统直接用 (const char*) str.toLocal8Bit()例如printf("%s", (const char*) str.toLocal8Bit());str是一个QString方法三 -----------------------------------------char str[64];本回答被提问者采纳