QString与c++字符串类型的相互转换
在C/C++编程中最繁琐的就是个个类型之间的相互转换，最近用到QT也牵扯到QString和字符串之间的类型转换，整理一下转换方法。
const char*
const char* const_str = "Hello World";
const char * 转 QString
QString q_str = const_c_str;
QString 转 char*
QByteArray ba1 = q_str.toUtf8();
char* c_str = ba1.data();
QString 转 const char*
QByteArray ba2 = q_str.toUtf8();
const char * const_c_str1 = ba2.constData();
QString 转 std::string
std::string std_str = q_str.toStdString();
QString 转 std::wstring
std::wstring std_wstr = q_str.toStdWString();
QString 转 const wchar_t *
const wchar_t* wchar_str = reinterpret_cast<const wchar_t *>(q_str.utf16());
wchar_t* 转 QString
QString qstr1 = QString::fromWCharArray(wchar_str);
string 转 QString
QString qstr2 = QString::fromStdString(std_str);
wstring 转 QString
QString qstr3 = QString::fromStdWString(std_wstr);
BYTE* 转 QString
void BYTEtoQString(BYTE* byStr, QString &strBy)
{
for (int i = 0; i < 16; i++)
{
char pBuff[2];
sprintf(pBuff, "%02x", byStr[i]);
strBy = strBy + pBuff;
}
}
TCHAR *类型转为QString类型：
QString WcharToChar(const TCHAR* wp, size_t codePage = CP_ACP)
{
QString str;
int len = WideCharToMultiByte(codePage, 0, wp, wcslen(wp), NULL, 0, NULL, NULL);
char *p = new char[len + 1];
memset(p, 0, len + 1);
WideCharToMultiByte(codePage, 0, wp, wcslen(wp), p, len, NULL, NULL);
p[len] = '\0';
str = QString(p);
delete p;
p = NULL;
return str;
}
QString类型转为TCHAR *类型
TCHAR *CharToWchar(const QString &str)
{
QByteArray ba = str.toUtf8();
char *data = ba.data(); //以上两步不能直接简化为“char *data = str.toUtf8().data();”
int charLen = strlen(data);
int len = MultiByteToWideChar(CP_ACP, 0, data, charLen, NULL, 0);
TCHAR *buf = new TCHAR[len + 1];
MultiByteToWideChar(CP_ACP, 0, data, charLen, buf, len);
buf[len] = '\0';
return buf;
}
以上两个分别分配了内存，最后在使用完后应将内存释放：
QString str("你好");
TCHAR *data = CharToWchar(str);
......
delete data;
data = NULL;
