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            Benjamin

            靜以修身,儉以養德,非澹薄無以明志,非寧靜無以致遠。
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            數據加載中……

            WCHAT、TCHAT、CString和char*的轉換(WM5.0)

            在平時的編程中字符串轉換經常遇到,常用的是MultiByteToWideChar和WideCharToMultiByte,具體的函數如下:
            /////////////////////////////////////////////////////////////////////////////
            //Description:
            // This function maps a wide-character string to a new character string
            //
            //Parameters:
            // lpcwszStr: [in] Pointer to the character string to be converted
            // lpszStr: [out] Pointer to a buffer that receives the translated string.
            // dwSize: [in] Size of the buffer
            //
            //Return Values:
            // TRUE: Succeed
            // FALSE: Failed
            //
            //Example:
            // MByteToWChar(szW,szA,sizeof(szA)/sizeof(szA[0]));
            //////////////////////////////////////////////////////////////////////////////
            BOOL WCharToMByte(LPCWSTR lpcwszStr, LPSTR lpszStr, DWORD dwSize)
            {
             DWORD dwMinSize;
             dwMinSize = WideCharToMultiByte(CP_OEMCP,NULL,lpcwszStr,-1,NULL,0,NULL,FALSE);
             if(dwSize < dwMinSize)
             {
              return FALSE;
             }
             WideCharToMultiByte(CP_OEMCP,NULL,lpcwszStr,-1,lpszStr,dwSize,NULL,FALSE);
             return TRUE;
            }
            ///////////////////////////////////////////////////////////////////////////////
            //Description:
            // This function maps a character string to a wide-character (Unicode) string
            //
            //Parameters:
            // lpcszStr: [in] Pointer to the character string to be converted
            // lpwszStr: [out] Pointer to a buffer that receives the translated string.
            // dwSize: [in] Size of the buffer
            //
            //Return Values:
            // TRUE: Succeed
            // FALSE: Failed
            //
            //Example:
            // MByteToWChar(szA,szW,sizeof(szW)/sizeof(szW[0]));
            ///////////////////////////////////////////////////////////////////////////////
            BOOL MByteToWChar(LPCSTR lpcszStr, LPWSTR lpwszStr, DWORD dwSize)
            {
                // Get the required size of the buffer that receives the Unicode
                // string.
                DWORD dwMinSize;
                dwMinSize = MultiByteToWideChar (CP_ACP, 0, lpcszStr, -1, NULL, 0);
             
                if(dwSize < dwMinSize)
                {
              return FALSE;
                }
             
                // Convert headers from ASCII to Unicode.
                MultiByteToWideChar (CP_ACP, 0, lpcszStr, -1, lpwszStr, dwMinSize); 
                return TRUE;
            }
            很少有人提及到下面的兩個函數size_t  wcstombs(char (&mbstr)[size], const wchar_t *wcstr,  size_t count );
            size_t mbstowcs( wchar_t (&wcstr)[size], const char *mbstr, size_t count ); 以為只能用在COM中,其實不然,還可以用在WM5.0和Wince平臺;
            用這兩個函數的好處就是一行代碼就可以完成轉換。要注意的是在用wcstombs函數時第三個參數必須是第二個參數長度的兩倍,用mbstowcs是第三個參數是第二個參數的長度,wcstombs可以完成WCHAR、TCHAR、CString向char*的轉換。
            CString是MFC中的類,可以用WCHAR、TCHAR、cahr*直接初始化和賦值;值得一提的是在WM5.0、WCE平臺稍微有些和其他windows平臺不同的是,雖然函數傳參時無論WCHAR/TCHAR、char*都可以轉成CString作參數傳遞,因為函數傳參實際是一個賦值的過程。但是在輸出到設備上時,還必須用mbstowcs函數來轉換。
            雖然Wce和Mobile平臺上只能用Unicode,但是讀寫文件時依然可以用標準C的文件操作函數,但是讀寫文件時用的字符要一致。
            關于VS2008平臺字符串轉換,請看http://msdn.microsoft.com/zh-cn/library/ms235631(VS.80).aspx

            posted on 2008-08-21 22:30 Benjamin 閱讀(4276) 評論(26)  編輯 收藏 引用 所屬分類: PDA/PPC開發

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