用executeInApplicationContext()打开的cad文档不能成为当前文档？

vten100

static char pData[]="d:\\22.dwg";
acDocManager->executeInApplicationContext(createdoc,(void* )pData);

  AcApDocument *pDoc=NULL;



AcApDocManager *pDocMgr = acDocManagerPtr();
AcApDocumentIterator *pDocItr;
pDocItr = pDocMgr->newAcApDocumentIterator();
//  AcApDocument *pDoc=NULL;
CString ThisFilename;//="d:\\22.dwg";

for(;!pDocItr->done();pDocItr->step())
{
  pDoc = pDocItr->document();
  ThisFilename = pDoc->docTitle();
   acutPrintf("\n"+ThisFilename);  
  if(strcmp(pData,ThisFilename)==0)//pData是要关闭的文档的name
  {
   acutPrintf("\n 文件关闭!");
   pDocMgr->closeDocument(pDoc);
  }
}

用executeInApplicationContext()打开的cad文档不能成为当前文档？