Cppwebbrowser's PostData

Widestring URL = "http://www.bianceng.cn/maker/pass.asp";;

paramstring = "username=test&password=12345";

Tvariant *postdata = new Tvariant (paramstring);

Cppwebbrowser->navigate (url,0,0,postdata,0);

This is not possible, the Web page does not receive parameters.

http://www.bianceng.cn/maker/pass.asp?username=test&password=12345

This is accessible.

How do I set the value of PostData?

I'm giving you a direct post function.

Such as:

Webpostdata (CppWebBrowser1, "http://211.91.2.221/pass.asp";

, "test=333333&password=343200");

I've tried, I can use it.

void __fastcall Tform1::webpostdata (tcppwebbrowser *cppwebbrowser, String surl, String spostdata)
{
BSTR bstrheaders = NULL;
Tvariant vflags = {0}, vtargetframename={0}, vpostdata={0}, vheaders={0};
Lpsafearray PSA;
LPCTSTR Cszpostdata = Spostdata.c_str ();
UINT Celems = Lstrlen (Cszpostdata);
LPSTR Ppostdata;
Lpvariant Pvpostdata;
Bstrheaders = SysAllocString (L "content-type:application/x-www-form-urlencodedrn");
if (!bstrheaders) {
Application->messagebox ("Could not allocate bstrheaders", "Warning", MB_OK | mb_iconwarning);
Return
}
V_VT (&vheaders) = VT_BSTR;
V_bstr (&vheaders) = Bstrheaders;
Pvpostdata = Vpostdata;
if (pvpostdata) {
VariantInit (Pvpostdata);
PSA = Safearraycreatevector (vt_ui1, 0, Celems);
if (!PSA) {
Return
}
Safearrayaccessdata (PSA, (lpvoid*) &ppostdata);
memcpy (Ppostdata, Cszpostdata, Celems);
Safearrayunaccessdata (PSA);
V_VT (pvpostdata) = Vt_array | VT_UI1;
V_array (pvpostdata) = PSA;
}
Cppwebbrowser->navigate ((tvariant) sURL, &vflags, &vtargetframename, &vpostdata, &vHeaders);
}
How to post the data using Tcppwebbrowser in C++builder (Turn www.borland.com)
Abstract:this article demonstrates techniques for using the Cppwebbrowser component to browse and post data using Navigate and Navigate2 methods. by Adam Vieweger.
I had been tearing I hair out for more than two. I wanted to use the Tcppwebbrowser component (distributed with Borland C++builder starting with BCB 5 Enterprise Edition) To create a app that would browse the Web and allow users to post data to Web pages. I was has a tough time of it because the documentation on Tcppwebbrowser is fairly sparse and there aren ' t many article s out there to guide me.
So I rolled up my sleeves and started working. I hope my discoveries prove useful.
The browsing with Cppwebbrowser turned out to is fairly simple. There are two methods that provide browsing capabilities:navigate and Navigate2:
Cppwebbrowser1->navigate ("http://www.inprise.com";)
Navigate2 is extension of Navigate, but practically it does not matter to us-in this article we can use both of them I nterchangeably.
Should you want the information about WebBrowser component properties, methods, and events, please refer to Onlin E MSDN library:http://msdn.microsoft.com/library/default.asp?url=/workshop/browser/webbrowser/reference/objects/ Webbrowser.asp
Harder PROBLEMS
Posting data proved to being a tougher nut to crack. Microsoft ' s component requires data to is passed in a SAFEARRAY structure. The problem is Navigate2 parameters are tvariant type. I needed to convert between SAFEARRAY and Tvariant.
That's where the Borland Community site came in handy. I found a great tutorial on "How to" SAFEARRAYs with C++builder. For further details, refer to SAFEARRAYs made easier.
The following code demonstrates the results of my. Navigate requires that the tvariant should is of type vb_array and that it should point to a SAFEARRAY. The SAFEARRAY should be of element type VT_UI1 (a unsigned int), dimension one, and it should have an element count equal To the number of bytes of data to be posted.
Confused? Take a look at the code and everything should is much clearer:
*method 1*
Tvariant Vtempty;
Tvariant Vtpostdataarray;
Char *str = "Action=logmein&username=myname&password=mypass";
SAFEARRAY FAR *PSA = NULL;
Safearraybound sabound[48];
sabound[0].celements = strlen (str);
Sabound[0].llbound = 0;
PSA = SafeArrayCreate (VT_UI1, 1, sabound);
for (unsigned int n = 0; n < strlen (str); n++) {
SafeArrayPutElement (PSA, (long*) 0, (void*) str[n]);
}
VTEMPTY.VT = Vt_empty;
VTPOSTDATAARRAY.VT = Vt_array;
Vtpostdataarray.setsafearray (PSA);
or VTPOSTDATAARRAY=PSA;
Tvariant vaddress = {"http://my.server/test/postresults.asp";};
Cppwebbrowser1->navigate2 (&vaddress, &vtempty, &vtempty, &vtpostdataarray, &vtEmpty);
SafeArrayDestroy (PSA);