调用wcsncat时遇到的诡异问题

guanzhouxuezi 2014-02-18 11:58:20

问题是这样的。
在C#代码中调用了C++的dll
C#调用：

 [DllImport("Assist.dll", EntryPoint = "SetXMLTextInEncryptFileConfig", CallingConvention = CallingConvention.Cdecl)]

        public static extern void SetXMLTextInEncryptFileConfig(string strEncryptFilePath, String pszDomain, String pszKey, Int32 pos, [MarshalAs(UnmanagedType.LPWStr)]String tag, [MarshalAs(UnmanagedType.LPWStr)]String content);

public void SetXMLTextInConfigInfo(string pszDomain, string pszKey, int pos, string tag, string content)

        {

            SetXMLTextInEncryptFileConfig(Path_ConfigInfo, pszDomain, pszKey, pos, tag, content);



        }

C++实现

void SetXMLTextInEncryptFileConfig(char* strEncryptFilePath,char* pszDomain, char* pszKey, size_t pos, wchar_t *tag, wchar_t *content)

{

	CString EncryptFilePath = strEncryptFilePath;

	CString strDomain = pszDomain;

	CString strKey = pszKey;

	CSimpleRefCnt<CEncryptFiles> pSPEncryptFile = qqmusic::GetEncryptFile(EncryptFilePath);

	wchar_t *pWValue;

	if(pSPEncryptFile.IsValid())

	{

		if(!pSPEncryptFile->GetValueAsString(strDomain,strKey,&pWValue))

		{

			return;

		}

		int nWValueLen = wcslen(pWValue);

		wchar_t *pCValue = new wchar_t[nWValueLen*2];

		ZeroMemory(pCValue, nWValueLen*2);

		wchar_t *pHead = new wchar_t[pos];

		ZeroMemory(pHead, pos);

		printf("pWValue is %ls", pWValue);

		wcsncpy(pHead, pWValue, pos);

		printf("pHead is %ls", pHead);

		wchar_t *pTail;

		pTail = wcsstr(pWValue, tag);

		wcsncat(pCValue,pHead, pos);

		wcscat(pCValue,L"\n");

		wcscat(pCValue,content);

		wcscat(pCValue,L"\r\n");

		int n = wcslen(content);

		wcscat(pCValue,pTail);

		wcscat(pCValue,L"\0");



		string configString = pSPEncryptFile->SetValue(strDomain,strKey,pCValue);



		CEncryptFile* pEncryptFile = new CEncryptFile();

		pEncryptFile->SaveDat(strEncryptFilePath,configString);

		delete[] pHead;

		delete[] pCValue;

		delete pEncryptFile;

	}

}