使用CSTRING时会导致内存泄漏或segfault吗

Question

我有以下示例代码：

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;
}

我的问题是当我调用这种方法时，我释放了对Pbuffer的内存，但是此Pbuffer仍然以Cstring（Pbuffer）返回，在使用这样的CSTRING时会导致内存泄漏或Segfault吗？

Answer 1

所以，我应该这样使用，对吗？

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();
}