1 //QString to wchar_t *: 2 const wchar_t * encodedName = reinterpret_cast<const wchar_t *>(fileName.utf16()); 3 4 //QString to char * given a file name: 5 QByteArray fileName = QFile::encodeName(aFileName); 6 const char * encodedName = fileName.constData(); //Valid as long as fileName exists 7 8 //QString to char * (general case): 9 const char * tmp = str.toUtf8().constData(); 10 [/code] 11 Windows 数据类型: http://msdn.microsoft.com/en-us/library/aa383751.aspx 12 [code lang="cpp"] 13 //TCHAR: 14 #ifdef UNICODE 15 typedef wchar_t TCHAR; 16 #else 17 typedef char TCHAR; 18 #endif 19 20 //LPCTSTR: 21 #ifdef UNICODE 22 typedef LPCWSTR LPCTSTR; 23 #else 24 typedef LPCSTR LPCTSTR; 25 #endif 26 27 //LPCSTR: 28 typedef const char * LPCSTR; 29 30 //LPCWSTR: 31 typedef const wchar_t * LPCWSTR; 32 33 //LPCWSTR to QString: 34 QString text(QString::fromUtf16(reinterpret_cast<const unsigned short *>(tmp))); 35 另一种解决办法是使用QString::fromWCharArray()，但这个函数可能导致一些尚未解决的wchar_t符号问题。 36 37 最佳的编程风格： 使用L来定义wchar_t宽字符串，比如 L"text" 字义了一个UNICODE字符串"text"。 38 39 今天又看到一个文章，关于字符串之间的转换，比较全面，在此将英文翻译并整理一下。 40 原文地址：http://hi.baidu.com/koko200147/blog/item/7e3cad828c9b9bb66d8119cb.html 41 42 QString与其他字符类型之间的转换，QString在Qt4中是UNICODE编码的，使用utf16规范。 43 44 QString::fromAscii ( const char * str, int size = -1 ); 45 QString::fromLatin1 ( const char * str, int size = -1 ); 46 QString::fromLocal8Bit ( const char * str, int size = -1 ); 47 QString::fromRawData ( const QChar * unicode, int size ); 48 QString::fromStdString ( const std::string & str ); 49 QString::fromStdWString ( const std::wstring & str ); 50 QString::fromUcs4 ( const uint * unicode, int size = -1 ); 51 QString::fromUtf8 ( const char * str, int size = -1 ); 52 QString::fromUtf16 ( const ushort * unicode, int size = -1 ); 53 QString::fromWCharArray ( const wchar_t * string, int size = -1 ); 54 55 //qstring ->std::string 56 QString::toStdString () ; 57 QString::toStdWString (); 58 59 //BSTR<->QString，不太了解BSTR是什么，还没用到过，所以不知道对不对 60 BSTR bstr_str; 61 QString q_str((QChar*)bstr_str, wcslen(bstr_str)); 62 bstr_str = SysAllocString(q_str.utf16());//remember use SysFreeString on BSTR 63 64 //QString<->LPCSTR 65 QString::toLocal8Bit().constData(); 66 QString::fromLocal8Bit ( const char * str, int size = -1 ); 67 68 //QString<->LPCWSTR 69 QString::utf16(); 70 QString::fromUtf16 ( const ushort * unicode, int size = -1 ); 71 72 //QString<->CString 73 CString c_str(qstring::utf16()); 74 QString fromUtf16 (LPCTSTR(c_str) ); 75 CString转换为char* 76 77 //1.传给未分配内存的const char* （LPCTSTR）指针. 78 CString cstr(asdd); 79 const char* ch = (LPCTSTR)cstr;//ch指向的地址和cstr相同。但由于使用const保证ch不会修改，所以安全. 80 81 //2.传给未分配内存的指针. 82 CString cstr = "ASDDSD"; 83 char *ch = cstr.GetBuffer(cstr1.GetLength() + 1); 84 cstr.ReleaseBuffer(); 85 //修改ch指向的值等于修改cstr里面的值. 86 //PS:用完ch后,不用delete ch,因为这样会破坏cstr内部空间,容易造成程序崩溃. 87 88 //3.第二种用法。把CString 值赋给已分配内存的char *。 89 CString cstr1 = "ASDDSD"; 90 int strLength = cstr1.GetLength() + 1; 91 char *pValue = new char[strLength]; 92 strncpy(pValue, cstr1, strLength); 93 94 //4.第三种用法.把CString 值赋给已分配内存char[]数组. 95 CString cstr2 = "ASDDSD"; 96 int strLength1 = cstr1.GetLength() + 1; 97 char chArray[100]; 98 memset(chArray,0, sizeof(bool) * 100); //将数组的垃圾内容清空. 99 strncpy(chArray, cstr1, strLength1); 100 101 //5.如果上述都不行，使用以下方法 102 CString origCString("Hello, World!"); 103 wchar_t* wCharString = origCString.GetBuffer(origCString.GetLength()+1); 104 size_t origsize = wcslen(wCharString) + 1; 105 size_t convertedChars = 0; 106 char *CharString; 107 CharString=new char(origsize); 108 wcstombs_s(&convertedChars, CharString, origsize, wCharString , _TRUNCATE); 109 cout << CharString << endl; //成功输出字符串"Hello,World" 110 从UTF8编码到GB编码的字符串转换方法： 111 112 QString Utf8_To_GB(QString strText) 113 { 114 return QString::fromUtf8(strText.toLocal8Bit().data()); 115 } 116 从GB编码到UTF8编码的字符串转换方法： 117 118 QString GB_To_Utf8(char *strText) 119 { 120 return QString::fromLocal8Bit(strText); 121 }
