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DDE code kills DDEML.dll and USER.exe

Posted on 1998-03-19
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Last Modified: 2013-11-19
why does this code eat memory and wind up GPFing the system?


CheckDlg::OnOK()
{
        // TODO: Add extra validation here
        DWORD pidInst =0;
        WORD result = DdeInitialize(&pidInst,DdeCallback,APPCMD_CLIENTONLY
,0L);
       
        //create a string handle for the Dde conversation
        HSZ server = DdeCreateStringHandle(pidInst,"MrktLink",CP_WINANSI);
       
        HSZ topic = DdeCreateStringHandle(pidInst,"Rates",CP_WINANSI);

        //connect to the DDE server application
        HCONV thisconv = DdeConnect(pidInst,server,topic,NULL);
        bool ok =  (thisconv !=NULL);

        DdeFreeStringHandle(pidInst,server);
        DdeFreeStringHandle(pidInst,topic);
        int t =0;
        HSZ item = DdeCreateStringHandle(pidInst,"NZD",CP_WINANSI);
        m_TOTAL=0;
        while (t <20)
        {
                HDDEDATA nzdat = DdeCreateDataHandle(pidInst,0,0,0,item,CF_
TEXT,NULL);
                LPDWORD result =0;
                nzdat = DdeClientTransaction(NULL,0L,thisconv,item,CF_TEXT,XT
YP_REQUEST,1200,result);
                LPDWORD sizereturned=0;
                CString tempText2 =(CString) DdeAccessData(nzdat,sizereturned);
                DdeUnaccessData(nzdat);
                DdeFreedataHandle(nzdat);
                m_RESULT = tempText2;
                m_TOTAL +=1;
                UpdateData(false);
        }
0
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Question by:bryceb
1 Comment
 
LVL 3

Accepted Solution

by:
byang earned 100 total points
ID: 1317097
You never updated "t" in the while loop, so (t<20) is always true. That's an endless loop at least.
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