what is wrong in this code

[Hamid Taebi]

Whats return value in ip ?

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WhiteSky

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[prathuraj]

I want to get a value from dynamic ip address control for that purpose i wrote this code CIPAddressCtrl* ip = (CIPAddressCtrl *)GetDlgItem(13); ip->GetAddress(dword);

[prasad_som]

prathuraj wrote:

CIPAddressCtrl *ip = (CIPAddressCtrl *)GetDlgItem(13);

Unless , you are having the control with id 13, nothing wrong with code. Though, I would have used dynamic_cast , instead of c-style cast.

prathuraj wrote:

ip->GetAddress(dwIPAddress);

If ip is non-null and controll retunrned in previous statement is of type CIPAddressCtrl, there should not be any problem. Can you specify, what problem you are facing.

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Prasad MS MVP -  VC++

[prathuraj]

ip->GetAddress(dword); Access violation error occured at this line

[prasad_som]

As sated in one of previous post, make sure, id 13 is assigned to control you are talking about.

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Prasad MS MVP -  VC++

[Hamid Taebi]

prathuraj wrote:

Access violation error occured at this line

Because ip is invalid.

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WhiteSky

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[prathuraj]

control id is correct.but pointer is null.what i do further

[Hamid Taebi]

How do you make this control?

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WhiteSky

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[Stephen Hewitt]

Try this code instead (run in a debug build):

CWnd *pWnd = GetDlgItem(13);
ASSERT(pWnd != NULL);
ASSERT(dynamic_cast<CIPAddressCtrl*>(pWnd) != NULL);
CIPAddressCtrl *ip = static_cast<CIPAddressCtrl*>(pWnd);

If the second line asserts in a debug build the id is wrong. If the third line asserts in a debug build the CWnd returned was not a CIPAddressCtrl and your cast is in error. Try adding a member variable (using ClassWizard in MSVC6); this step makes calling GetDlgItem unnecessary. If this line fails to compile enable RTTI (just in the debug build) and try again. If the fourth line fails to compile CIPAddressCtrl is not derived from CWnd. Don't use C-style casts!

Steve

[krmed]

Typically, the wizards assign control IDs starting at 1000 - perhaps the ID you chose (13) is actually some other control that has been assigned by Microsoft. It could be that by simply changing your ID (perhaps to something like above 1000, you may be ok as long as that ID isn't used elsewhere in your project. Hope that helps.

Karl - WK5M PP-ASEL-IA (N43CS) PGP Key: 0xDB02E193 PGP Key Fingerprint: 8F06 5A2E 2735 892B 821C 871A 0411 94EA DB02 E193