[ARX程序]：可不可以用acutBuildList来给实体添加扩展数据啊

xcxm0304

可不可以用acutBuildList来给实体添加扩展数据啊

为什么我用他添加后却找不到该实体的扩展数据呢。


求大侠赐教。谢谢！

qinhongxian

下面的例子:
// This function calls the selectObject() function to allow
// the user to pick an object; then it accesses the xdata of
// the object and sends the list to the printList() function
// that lists the restype and resval values.
//
void
printXdata()
{
    // Select and open an object.
    //
    AcDbObject *pObj;
    if ((pObj = selectObject(AcDb::kForRead)) == NULL) {
        return;
    }

    // Get the application name for the xdata.
    //
    char appname[133];
    if (acedGetString(NULL,
        "\nEnter the desired Xdata application name: ",
        appname) != RTNORM)
    {
        return;
    }

    // Get the xdata for the application name.
    //
    struct resbuf *pRb;
    pRb = pObj->xData(appname);
    if (pRb != NULL) {
        // Print the existing xdata if any is present.
        // Notice that there is no -3 group, as there is in
        // LISP. This is ONLY the xdata, so
        // the -3 xdata-start marker isn't needed.
        //
        printList(pRb);
        acutRelRb(pRb);
    } else {
        acutPrintf("\nNo xdata for this appname");
    }
    pObj->close();
}

void
addXdata()
{
    AcDbObject* pObj = selectObject(AcDb::kForRead);
    if (!pObj) {
        acutPrintf("Error selecting object\n");
        return;
    }

    // Get the application name and string to be added to
    // xdata.
    //
    char appName[132], resString[200];
    appName[0] = resString[0] = '\0';
    acedGetString(NULL, "Enter application name: ",
        appName);
    acedGetString(NULL, "Enter string to be added: ",
        resString);

    struct  resbuf  *pRb, *pTemp;

    pRb = pObj->xData(appName);
    if (pRb != NULL) {
        // If xdata is present, then walk to the
        // end of the list.
        //
        for (pTemp = pRb; pTemp->rbnext != NULL;
                pTemp = pTemp->rbnext)
                { ; }
    } else {
        // If xdata is not present, register the application
        // and add appName to the first resbuf in the list.
        // Notice that there is no -3 group as there is in
        // AutoLISP. This is ONLY the xdata so
        // the -3 xdata-start marker isn't needed.
        //
        acdbRegApp(appName);
        pRb = acutNewRb(AcDb::kDxfRegAppName);
        pTemp = pRb;
        pTemp->resval.rstring
            = (char*) malloc(strlen(appName) + 1);
        strcpy(pTemp->resval.rstring, appName);
    }

    // Add user-specified string to the xdata.
    //
    pTemp->rbnext = acutNewRb(AcDb::kDxfXdAsciiString);
    pTemp = pTemp->rbnext;
    pTemp->resval.rstring
        = (char*) malloc(strlen(resString) + 1);
    strcpy(pTemp->resval.rstring, resString);

    // The following code shows the use of upgradeOpen()
    // to change the entity from read to write.
    //
    pObj->upgradeOpen();
    pObj->setXData(pRb);

    pObj->close();
    acutRelRb(pRb);
}

xcxm0304

这个不就是docsampoles里面的例子嘛
用上面的方法我知道是可以的，而且已经做出来了。但是那样要一个一个的加，
我是问，可不可以用acutBuildList（……），一下子把自己想要的全加进去，那样就方便多了啊。

续上

哦，知道了，好象不可以。必须用扩展数据的DXF码。

续上，好象也不对，还是请高手指点。