使用CString时会不会导致memory泄漏或段错误

Question

I have the following sample code:

CString CHttpsClient::converEncoding(LPWSTR originalString, long encodingType)
{
    if (encodingType == CP_ACP) {
        return CString(originalString);
    }
    CString ret;

    int nBufferSize = MultiByteToWideChar(encodingType, 0, (LPCCH)originalString, -1, NULL, 0); 
    wchar_t *pBuffer = (wchar_t*)malloc(nBufferSize * sizeof(wchar_t));
    MultiByteToWideChar(CP_UTF8, 0, (LPCCH)originalString, -1, pBuffer, nBufferSize * sizeof(wchar_t));
    ret = CString(pBuffer);
    free(pBuffer); 
    return ret;
}

My question is when I invoke this method, I have freed memory of pBuffer, but this pBuffer still returned as CString(pBuffer), Will it cause memory leak or segfault when using CString like this?

Answer 1

So, I should use it like this, right?:

void CHttpsClient::converEncoding(CString& result, LPWSTR originalString, long encodingType)
{
    if (encodingType == CP_ACP) {
        return;
    }
    int nBufferSize = MultiByteToWideChar(encodingType, 0, (LPCCH)originalString, -1, NULL, 0); 
    wchar_t *pBuf = result.GetBuffer(nBufferSize * sizeof(wchar_t));
    MultiByteToWideChar(CP_UTF8, 0, (LPCCH)originalString, -1, pBuf, nBufferSize * sizeof(wchar_t));
}

void CHttpsClient::someMethod(){
    CString text = _T("");
    converEncoding(text, _T("Hello StackOverflow"), utf-8);
    text.ReleaseBuffer();
}