C++/CLI 托管C++之字符串封装【5】

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【1】字符串作为输入参数

C++导出函数：

//1.1 字符串作为输入参数EXPORTDLL_CLASS int Str_Output( WCHAR *pInStr ){if (NULL == pInStr){return(-1);}wprintf(L"Str_Output %s\n", pInStr);return(0);}

CLI类封装：

 /// <summary>    /// 1 字符串测试类    /// </summary>public ref class StrCls{    public:        /// <summary>        /// 1.1 字符串作为输入参数        /// </summary>        /// <param name="pInStr">字符串</param>          /// <returns>成功返回0</returns>         static Int32 StrOutput(String^ pInStr);               /// <summary>        /// 1.2 字符串作为参数,需要进行修改返回        /// </summary>        /// <param name="pOutStr">字符串</param>          /// <returns>成功返回0</returns>         static Int32 StrChange(String^ %pOutStr);                /// <summary>        /// 1.3 字符串数组作为参数        /// </summary>        /// <param name="ppStr">字符串数组</param>          /// <returns>成功返回0</returns>         static Int32 StrChangeArr(array<String^>^ %ppStr);};

CLI函数实现：

System::Int32 ExportCLI::StrCls::StrOutput( String^ pInStr ){    if (String::IsNullOrEmpty(pInStr))    {        return(-1);    }    WCHAR   *pStr = ManagedStr2UnmanagedUniStr(pInStr);    HRESULT  hr   = Str_Output(pStr);    //内存释放    if (NULL != pStr)    {        delete []pStr;        pStr = NULL;    }    return(hr);}

C#测试：

//1. 字符串测试类string pInStr = "1.1";StrCls.StrOutput(pInStr);

【2】字符串作为参数，需要返回修改

//1.2 字符串作为参数,需要进行修改返回EXPORTDLL_CLASS int Str_Change( WCHAR *pOutStr){if (NULL == pOutStr){return(-1);}    int len = wcslen(pOutStr);for (int ix=0; ix<len-1; ix++){pOutStr[ix] = 'a' + (ix) % 26;}pOutStr[len-1] = '\0\0';wprintf(L"Str_Change %s\n", pOutStr);return(0);}

CLI函数实现：

System::Int32 ExportCLI::StrCls::StrChange( String^ %pOutStr ){    if (String::IsNullOrEmpty(pOutStr))    {        return(-1);    }    WCHAR   *pStr = ManagedStr2UnmanagedUniStr(pOutStr);    HRESULT  hr   = Str_Change(pStr);    pOutStr = UnmanagedStr2ManagedUniStr(pStr);    //内存释放    if (NULL != pStr)    {        delete []pStr;        pStr = NULL;    }    return(hr);}

C#测试：

string pOutStr = "1.2";StrCls.StrChange(ref pOutStr);

【3】字符串数组作为参数，需要返回修改

C++导出函数：

//1.3 字符串数组作为参数EXPORTDLL_CLASS int Str_ChangeArr( WCHAR **ppStr, int len ){if (NULL == ppStr){return(-1);}for (int ix=0; ix<len; ix++){if (NULL != ppStr[ix]){lstrcpyn(ppStr[ix], L"abc", wcslen(ppStr[ix]));}}wprintf(L"Str_ChangeArr \n");return(0);}

CLI函数实现：

System::Int32 ExportCLI::StrCls::StrChangeArr( array<String^>^ %ppStr ){    if (ppStr == nullptr)    {        return(-1);    }    int     len  = ppStr->Length; //数据元素的个数    WCHAR   **pp = new WCHAR *[len];    for (int ix=0; ix<len; ix++)    {        pp[ix] = ManagedStr2UnmanagedUniStr(ppStr[ix]);    }    HRESULT  hr   = Str_ChangeArr(pp, len);    for (int ix=0; ix<len; ix++)    {        ppStr[ix] = UnmanagedStr2ManagedUniStr(pp[ix]);    }    //内存释放    for (int ix=0; ix<len; ix++)    {        delete [](pp[ix]);        pp[ix] = NULL;    }    delete []pp;    pp = NULL;    return(hr);}

C#测试：

string[] ppStr = new string[2] { "1.31.......", "1.32......." };StrCls.StrChangeArr(ref ppStr);

源代码：

https://coding.net/u/aoshilangCode/p/CLI/git

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