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BSTR、char*和CString short转换
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(1) char*转换成CString
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若将char*转换成CString,除了直接赋值外,还可使用CString::Format进行。例如:
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char chArray[] = "This is a test";
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char * p = "This is a test";
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或
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LPSTR p = "This is a test";
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或在已定义Unicode应的用程序中
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TCHAR * p = _T("This is a test");
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或
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LPTSTR p = _T("This is a test");
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CString theString = chArray;
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theString.Format(_T("%s"), chArray);
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theString = p;
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(2) CString转换成char*
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若将CString类转换成char*(LPSTR)类型,常常使用下列三种方法:
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方法一,使用强制转换。例如:
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CString theString( "This is a test" );
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LPTSTR lpsz =(LPTSTR)(LPCTSTR)theString;
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方法二,使用strcpy。例如:
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CString theString( "This is a test" );
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LPTSTR lpsz = new TCHAR[theString.GetLength()+1];
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_tcscpy(lpsz, theString);
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需要说明的是,strcpy(或可移值Unicode/MBCS的_tcscpy)的第二个参数是 const wchar_t* (Unicode)或const char* (ANSI),系统编译器将会自动对其进行转换。
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方法三,使用CString::GetBuffer。例如:
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CString s(_T("This is a test "));
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LPTSTR p = s.GetBuffer();
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// 在这里添加使用p的代码
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if(p != NULL) *p = _T('\0');
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s.ReleaseBuffer();
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// 使用完后及时释放,以便能使用其它的CString成员函数
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(3) BSTR转换成char*
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方法一,使用ConvertBSTRToString。例如:
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#include
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#pragma comment(lib, "comsupp.lib")
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int _tmain(int argc, _TCHAR* argv[]){
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BSTR bstrText = ::SysAllocString(L"Test");
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char* lpszText2 = _com_util::ConvertBSTRToString(bstrText);
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SysFreeString(bstrText); // 用完释放
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delete[] lpszText2;
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return 0;
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}
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方法二,使用_bstr_t的赋值运算符重载。例如:
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_bstr_t b = bstrText;
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char* lpszText2 = b;
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(4) char*转换成BSTR
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方法一,使用SysAllocString等API函数。例如:
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BSTR bstrText = ::SysAllocString(L"Test");
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BSTR bstrText = ::SysAllocStringLen(L"Test",4);
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BSTR bstrText = ::SysAllocStringByteLen("Test",4);
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方法二,使用COleVariant或_variant_t。例如:
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//COleVariant strVar("This is a test");
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_variant_t strVar("This is a test");
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BSTR bstrText = strVar.bstrVal;
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方法三,使用_bstr_t,这是一种最简单的方法。例如:
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BSTR bstrText = _bstr_t("This is a test");
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方法四,使用CComBSTR。例如:
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BSTR bstrText = CComBSTR("This is a test");
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或
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CComBSTR bstr("This is a test");
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BSTR bstrText = bstr.m_str;
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方法五,使用ConvertStringToBSTR。例如:
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char* lpszText = "Test";
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BSTR bstrText = _com_util::ConvertStringToBSTR(lpszText);
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(5) CString转换成BSTR
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通常是通过使用CStringT::AllocSysString来实现。例如:
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CString str("This is a test");
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BSTR bstrText = str.AllocSysString();
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…
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SysFreeString(bstrText); // 用完释放
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(6) BSTR转换成CString
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一般可按下列方法进行:
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BSTR bstrText = ::SysAllocString(L"Test");
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CStringA str;
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str.Empty();
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str = bstrText;
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或
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CStringA str(bstrText);
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(7) ANSI、Unicode和宽字符之间的转换
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方法一,使用MultiByteToWideChar将ANSI字符转换成Unicode字符,使用WideCharToMultiByte将Unicode字符转换成ANSI字符。
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方法二,使用“_T”将ANSI转换成“一般”类型字符串,使用“L”将ANSI转换成Unicode,而在托管C++环境中还可使用S将ANSI字符串转换成String*对象。例如:
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TCHAR tstr[] = _T("this is a test");
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wchar_t wszStr[] = L"This is a test";
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String* str = S”This is a test”;
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方法三,使用ATL 7.0的转换宏和类。ATL7.0在原有3.0基础上完善和增加了许多字符串转换宏以及提供相应的类,它具有如图3所示的统一形式:
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其中,第一个C表示“类”,以便于ATL 3.0宏相区别,第二个C表示常量,2表示“to”,EX表示要开辟一定大小的缓冲。SourceType和DestinationType可以是A、 T、W和OLE,其含义分别是ANSI、Unicode、“一般”类型和OLE字符串。例如,CA2CT就是将ANSI转换成一般类型的字符串常量。下面是一些示例代码:
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LPTSTR tstr= CA2TEX<16>("this is a test");
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LPCTSTR tcstr= CA2CT("this is a test");
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wchar_t wszStr[] = L"This is a test";
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char* chstr = CW2A(wszStr);
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char 转换成short
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int atoi(char *nptr) 将字符串nptr转换成整型数, 并返回这个数,错误返回0
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char *num = "123";
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unsigned short a;
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a = (unsigned short) atoi(num) ;
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就是这样了
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类似的函数还有:
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long atol(char *nptr) 将字符串nptr转换成长整型数,并返回这个数,错误返回0
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double atof(char *nptr) 将字符串nptr转换成双精度数,并返回这个数,错误返回0
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