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VARIANT structure

hbh
hbh asked
on
Medium Priority
737 Views
Last Modified: 2013-11-20
I am using function
HRESULT IWebBrowser::Navigate(
    BSTR URL,                     // URL to navigate to
    VARIANT FAR* Flags,           // addr of option flags
    VARIANT FAR* TargetFrameName, // addr of frame name
    VARIANT FAR* PostData,        // addr of http Postdata
    VARIANT FAR* Headers,         // addr of HTTP headers
);

and wand to set the second parameter Flags.
It can come from another enum structure called
BrowserNavConstants. Could anyone tell me how
to put the values in BrowserNavConstants into
Flags? What is wrong in my code as following?

IWebBrowser mSearch;
VARIANT *flgaddr;
BrowserNavConstants flg;
flgaddr=&flg; //Wrong! how to set?
m_search.Navigate(URL, flgaddr, NULL, NULL, NULL);

Comment
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Engineer
Commented:
Try using

 IWebBrowser mSearch;
 VARIANT *flgaddr;
 BrowserNavConstants flg;
 COleVariant v;
 v = flg;
 flgaddr = v;
 m_search.Navigate(URL, flgaddr, NULL, NULL, NULL);


 

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hbh

Author

Commented:
That doesn't work.
We can find, according to Help Information about the second
paramenter Flags:
"The variable can be a combination of the values defined by the
BrowserNavConstants enumeration." and

typedef enum BrowserNavConstants {
    navOpenInNewWindow = 1,
    navNoHistory = 2,
    navNoReadFromCache = 4,
    navNoWriteToCache = 8
} BrowserNavConstants;
which has been defined in Exdisp.h file.

However, the Flags is an address of VARIANT structure.
So I confuse about the two structures. Can anyone help me?  
hbh

Commented:
Try the following:

IWebBrowser mSearch;
VARIANT varFlag;
BrowserNavConstants flg;

V_BYREF(&varFlag) = (void *) &flg;

m_search.Navigate(URL, &varFlag, NULL, NULL, NULL);

Commented:
Oops, you must initialize your VARIANT, so go first::

VariantInit(&varFlag);
V_VT(&varFlag) = VT_BYREF;
V_BYREF(&varFlag) = (void *) &flg;

m_search.Navigate(URL, &varFlag, NULL, NULL, NULL);


hbh

Author

Commented:
Very good, it works. I think the Flag is long typ, so it
should be:
   VARIANT varFlag;
   BrowserNavConstants flg;
   flg = navNoHistory;
   VariantInit(&varFlag);
   V_VT(&varFlag) = VT_I4;
   V_I4REF(&varFlag) = (long *) &flg;
   m_search.Navigate(s_homepage, &varFlag, NULL, NULL, NULL);

However there is no any effct after "Flag" is set.
Acturally, here m_search is a WebBrowser control mumber variable.
Maybe this parameter is not effect to the Nevigate Method.
hbh.

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