appContextNewDocument() 和 appContextOpenDocument()

54syt

我从ObjectARX 2008的 例子 docman project 拷贝了几个函数如下：
void newSyncDocHelper( void *pData)
{
    if (acDocManager->isApplicationContext()) {
        const TCHAR * fileName = (const TCHAR *)pData;
        Acad::ErrorStatus es = acDocManager->appContextNewDocument(fileName);
        assert(es == Acad::eOk);
    }
    else
        assert(0 && "\nERROR: in Document context");
}

void openSyncDocHelper( void *pData)
{
    if (acDocManager->isApplicationContext()) {
        const TCHAR * fileName = (const TCHAR *)pData;
        Acad::ErrorStatus es = acDocManager->appContextOpenDocument(fileName);
        assert(es == Acad::eOk);
    }
    else
        assert(0 && "ERROR: in Document context.");
}



openSyncDoc()
{
    static TCHAR pData[] = _T(/*NOXLATE*/"test1.dwg");

    AcApDocument* pDoc = acDocManager->curDocument();
    if (pDoc) {
        acutPrintf(_T("\nCurrently in Document context : %s, Switching to App.\n"),pDoc->fileName());
        acDocManager->executeInApplicationContext(openSyncDocHelper, (void *)pData);
    }
}

void
newSyncDoc()
{
    static TCHAR pData[] = _T(/*NOXLATE*/"acad.dwt");

    AcApDocument* pDoc = acDocManager->curDocument();
    if (pDoc) {
        acutPrintf(_T("\nCurrently in Document context : %s, Switching to App.\n"),pDoc->fileName());
        acDocManager->executeInApplicationContext(newSyncDocHelper, (void *)pData);
    }
}
当我在我的项目里面用这几个函数时， 当调用 openSyncDoc（）时 acDocManager->appContextOpenDocument（）是正常的返回Acad::eOK.
但调用newSyncDoc（）时 acDocManager->appContextNewDocument（）返回的却一直是Acad::eFilerError. 不知道是怎么回事。
Can you help me?  thanks.