WebBrowser Navigate Post problems!

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4 total messages Started by Mischa Simmonds Tue, 07 Aug 2007 13:32

#232

Author: Mischa Simmonds
Date: Tue, 07 Aug 2007 13:32

21 lines
1762 bytes

I am trying to use either the Navigate or Navigate2 methods within 
IWebBrowser2 but even though I provide post data and the additional 
header data I can still only send the equivalent of a GET command (ie: 
just load the URL but not post any data with it)

My code is something like this...

AnsiString URL="http://www.somewhere.com";
AnsiString Post="name=Mischa&Country=Australia";
_di_IWebBrowser2 CppWebBrowser->Navigate2(URL,"","",Post,"Content-Type: 
application/x-www-form-urlencoded\r\n");

It looks like Post should be a Variant of sorts, but I just can't work 
it out.

I have looked at http://msdn2.microsoft.com/en-us/library/aa752127.aspx 
(IWebBrowser2::Navigate/Navigate2 Methods), and also tried to use the 
ideas expressed in http://dn.codegear.com/en/article/27519 but get the 
same result.

Any ideas?

Re: WebBrowser Navigate Post problems!

#233

Author: Remy Lebeau (TeamB)
Date: Tue, 07 Aug 2007 17:20

42 lines
2386 bytes

"Mischa Simmonds" <mischa1.BanSpam@informationdesign.BanSpam.com.au> wrote
in message news:46b87478$1@newsgroups.borland.com...

> My code is something like this...

That code shouldn't even be able to compile, let alone run.  Each of the
parameters of TCppWebBrowser::Navigate2() expect a pointer to a TVariant,
but you are not constructing any TVariant instances at all.  And it is also
unclear whether you are actually trying to call the
TCppWebBrowser::Navigate2() method or the IWebBrowser2::Navigate2() method,
for that matter.

Try this instead:

    AnsiString asPostData = "name=Mischa&Country=Australia";

    LPSAFEARRAY psa = SafeArrayCreateVector(VT_UI1, 0, asPostData.Length());
    if( psa )
    {
        void *pvdata = NULL;
        SafeArrayAccessData(psa, &pvdata);
        memcpy(pvdata, asPostData.c_str(), asPostData.Length());
        SafeArrayUnaccessData(psa);

        TVariant vPostData(psa);
        TVariant vURL = AnsiString("http://www.somewhere.com");
        TVariant vContentType = AnsiString("Content-Type:
application/x-www-form-urlencoded\r\n");

        CppWebBrowser->Navigate2(&vURL, TNoParam(), TNoParam(), &vPostData,
&vContentType);
    }


> I have ... also tried to use the ideas expressed in
> http://dn.codegear.com/en/article/27519 but get the same result.

The code you showed is not doing anything that article says to do.


Gambit

Re: WebBrowser Navigate Post problems!

#234

Author: Mischa Simmonds
Date: Thu, 09 Aug 2007 02:03

83 lines
3576 bytes

Thank you, thank you Remy!

It works!

However, I had to remove the referencing operators (&) from the 
Navigate2 function for it to work (no data was being sent at all). Also, 
I used "TVariant vFlags = {0};" instead of "TNoParam() ", as I got the 
error, "E2064 Cannot initialize 'OleVariant &' with 'TNoParam' " on 
compilation.

Here is my final code....

void WebPostData(_di_IWebBrowser2 CppWebBrowser, AnsiString sURL, 
AnsiString sPostData)
{
    LPSAFEARRAY psa = SafeArrayCreateVector(VT_UI1, 0, sPostData.Length());
    if( psa )
    {
        void *pvdata = NULL;
        SafeArrayAccessData(psa, &pvdata);
        memcpy(pvdata, sPostData.c_str(), sPostData.Length());
        SafeArrayUnaccessData(psa);
        TVariant vPostData(psa);
        TVariant vFlags = {0}, vTargetFrameName={0};
        TVariant vURL=sURL;
        TVariant vContentType = 
AnsiString("Content-Type:application/x-www-form-urlencoded\r\n");
        CppWebBrowser->Navigate2(vURL, vFlags, vTargetFrameName, 
vPostData,vContentType);
    }
}



Remy Lebeau (TeamB) wrote:
> "Mischa Simmonds" <mischa1.BanSpam@informationdesign.BanSpam.com.au> wrote
> in message news:46b87478$1@newsgroups.borland.com...
>
>   
>> My code is something like this...
>>     
>
> That code shouldn't even be able to compile, let alone run.  Each of the
> parameters of TCppWebBrowser::Navigate2() expect a pointer to a TVariant,
> but you are not constructing any TVariant instances at all.  And it is also
> unclear whether you are actually trying to call the
> TCppWebBrowser::Navigate2() method or the IWebBrowser2::Navigate2() method,
> for that matter.
>
> Try this instead:
>
>     AnsiString asPostData = "name=Mischa&Country=Australia";
>
>     LPSAFEARRAY psa = SafeArrayCreateVector(VT_UI1, 0, asPostData.Length());
>     if( psa )
>     {
>         void *pvdata = NULL;
>         SafeArrayAccessData(psa, &pvdata);
>         memcpy(pvdata, asPostData.c_str(), asPostData.Length());
>         SafeArrayUnaccessData(psa);
>
>         TVariant vPostData(psa);
>         TVariant vURL = AnsiString("http://www.somewhere.com");
>         TVariant vContentType = AnsiString("Content-Type:
> application/x-www-form-urlencoded\r\n");
>
>         CppWebBrowser->Navigate2(&vURL, TNoParam(), TNoParam(), &vPostData,
> &vContentType);
>     }
>
>
>   
>> I have ... also tried to use the ideas expressed in
>> http://dn.codegear.com/en/article/27519 but get the same result.
>>     
>
> The code you showed is not doing anything that article says to do.
>
>
> Gambit
>
>
>

Re: WebBrowser Navigate Post problems!

#235

Author: Remy Lebeau (TeamB)
Date: Thu, 09 Aug 2007 02:37

54 lines
2870 bytes

"Mischa Simmonds" <mischa1.BanSpam@informationdesign.BanSpam.com.au> wrote
in message news:46ba75fc@newsgroups.borland.com...

> However, I had to remove the referencing operators (&) from the
> Navigate2 function for it to work (no data was being sent at all).

You need to use the '&' operator.  Navigate2() is expecting pointers:

    HRESULT Navigate2(VARIANT *URL, VARIANT *Flags, VARIANT
*TargetFrameName, VARIANT *PostData, VARIANT *Headers);

> I used "TVariant vFlags = {0};" instead of "TNoParam() "

TNoParam() is the proper way to pass an empty variant for an optional
parameter.  It initializes a TVariant whose vt member is set to VT_ERROR and
scode member is set to DISP_E_PARAMNOTFOUND.  Those values are a requirement
for optional parameters, but you are not doing that in your code.

> I got the error, "E2064 Cannot initialize 'OleVariant &' with 'TNoParam' "
> on compilation.

Navigate2() does not use OleVariant.

> Here is my final code....

Try this instead:

    void WebPostData(_di_IWebBrowser2 CppWebBrowser, const AnsiString &sURL,
const AnsiString &sPostData)
    {
        LPSAFEARRAY psa = SafeArrayCreateVector(VT_UI1, 0,
sPostData.Length());
        if( psa )
        {
            void *pvdata = NULL;
            SafeArrayAccessData(psa, &pvdata);
            memcpy(pvdata, sPostData.c_str(), sPostData.Length());
            SafeArrayUnaccessData(psa);

            TVariant vPostData(psa);
            TVariant vFlags = TNoParam();
            TVariant vTargetFrameName = TNoParam();
            TVariant vURL = sURL;
            TVariant vContentType =
> AnsiString("Content-Type:application/x-www-form-urlencoded\r\n");

            CppWebBrowser->Navigate2(&vURL, &vFlags, &vTargetFrameName,
&vPostData, &vContentType);
        }
    }


Gambit

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