Re: Access violation for TWebBrowser: fixes didn't work at all


Hans-Peter Diettrich ha scritto:

euthymos wrote:

Debugging, I've found the line which raises the exception.


var
MyTextField, MySummaryField : string;
Document : IHTMLDocument2;
elem : IHTMLTextAreaElement;

Document := WebBrowser1.Document as IHTMLDocument2;
elem := Document.all.item('htmlbox', 0) as IHTMLTextAreaElement;

Insert an Nil check here, most probably elem is nil.

elem.value := MySummaryField; // <<< This line raises an
EAccessViolation exception with message 'Access violation at address
0066AA87 in module 'MySQLNewsManager.exe'. Read of address 00000000'.

DoDi

I think I've got it: it's a problem of asynchronousness. And it's very
hard to solve. Please help me: when I try to manipulate "elem",
Internet Explorer has not finished loading the page, so elem is nil.
How can I force TWebBrowser to behave in a synchronous way?

I tried to use the OnDocumentComplete to be sure the document is fully
loaded when interacting with it. But it didn't work.

.

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