Hi,

I try to embed Windows Internet Explorer into my application. Most of the coding should be availabe. During method navigate2 I get an empty white screen. No errors is thrown but also the web page is not loaded. Do you have some ideas?

=> Is use the windows headers from DSource and the dgui forms library. I attached the source code.

Kind regards
André

I'm not able to run your code but are you sure the web page control is sized in your window? One time I had a problem like this and it was because the control was a 1x1 pixel...

Am 17.12.2013 17:34, schrieb Adam D. Ruppe:
> I'm not able to run your code but are you sure the web page control is
> sized in your window? One time I had a problem like this and it was
> because the control was a 1x1 pixel...

I just checked, the dimensions of the main form are passed correctly
to the IWebBrowser2 instance. GetClientRect(hwnd) is used and dimensions
are evaluated correctly.

Am 16.12.2013 19:44, schrieb Andre:
> Hi,
>
> I try to embed Windows Internet Explorer into my application.
> Most of the coding should be availabe. During method navigate2
> I get an empty white screen. No errors is thrown but also the
> web page is not loaded. Do you have some ideas?
>
> => Is use the windows headers from DSource and the dgui forms library.
> I attached the source code.
>
> Kind regards
> André

The issue was related to SysAllocString:

VARIANT myURL;
VariantInit(&myURL);
myURL.vt = cast(VARTYPE)VARENUM.VT_BSTR;
=> myURL.bstrVal = SysAllocString(cast(const(wchar*))url);
webBrowser2.Navigate2( &myURL, null, null, null, null);

It only works with statement:
myURL.bstrVal = cast(wchar*)"http://www.google.de";

Am Wed, 18 Dec 2013 21:48:30 +0100
schrieb Andre <andre@s-e-a-p.de>:

> Am 16.12.2013 19:44, schrieb Andre:
> > Hi,
> >
> > I try to embed Windows Internet Explorer into my application. Most of the coding should be availabe. During method navigate2 I get an empty white screen. No errors is thrown but also the web page is not loaded. Do you have some ideas?
> >
> > => Is use the windows headers from DSource and the dgui forms library. I attached the source code.
> >
> > Kind regards
> > André
> 
> The issue was related to SysAllocString:
> 
> VARIANT myURL;
> VariantInit(&myURL);
> myURL.vt = cast(VARTYPE)VARENUM.VT_BSTR;
> => myURL.bstrVal = SysAllocString(cast(const(wchar*))url);
> webBrowser2.Navigate2( &myURL, null, null, null, null);
> 
> It only works with statement:
> myURL.bstrVal = cast(wchar*)"http://www.google.de";

Did you mean this?:
  myURL.bstrVal = "http://www.google.de"w.ptr;


-- 
Marco

Am 19.12.2013 10:58, schrieb Marco Leise:

> Did you mean this?:
>    myURL.bstrVal = "http://www.google.de"w.ptr;
>
>

Exacactly. But if I have my url in a string variable,
how can I get the wchar[].ptr from my string variable,
to fill bstrVal?

On Thursday, 19 December 2013 at 15:45:49 UTC, Andre wrote:
> Exacactly. But if I have my url in a string variable,
> how can I get the wchar[].ptr from my string variable,
> to fill bstrVal?

You can use wstring variables and convert them with

import std.utf;

wchar* str = toUTFz!(wchar*)(another_string_variable);

then you can fill it. Or you can also do

import std.conv;

wstring ws = to!wstring(another_string_variable);



The difference is the first one has a zero terminator, so you can easily pass it to C functions. The second one doesn't, but it is a D array so you can use .ptr and .length.

Am 19.12.2013 16:54, schrieb Adam D. Ruppe:
> On Thursday, 19 December 2013 at 15:45:49 UTC, Andre wrote:
>> Exacactly. But if I have my url in a string variable,
>> how can I get the wchar[].ptr from my string variable,
>> to fill bstrVal?
>
> You can use wstring variables and convert them with
>
> import std.utf;
>
> wchar* str = toUTFz!(wchar*)(another_string_variable);
>
> then you can fill it. Or you can also do
>
> import std.conv;
>
> wstring ws = to!wstring(another_string_variable);
>
>
>
> The difference is the first one has a zero terminator, so you can easily
> pass it to C functions. The second one doesn't, but it is a D array so
> you can use .ptr and .length.

Thanks a lot!
thats the solution

On 18/12/2013 20:48, Andre wrote:
> => myURL.bstrVal = SysAllocString(cast(const(wchar*))url);


Looks like the problem there is casting a string to a wchar* - I guess the resulting BSTR will contain garbage instead of the intended value.


>
> It only works with statement:
> myURL.bstrVal = cast(wchar*)"http://www.google.de";
>


Treating a wchar* as a BSTR might cause unexpected things to happen - converting the string to a wchar* and then passing that to SysAllocString would be safer.

Am Thu, 19 Dec 2013 17:36:57 +0000
schrieb Richard Webb <richard.webb@boldonjames.com>:

> On 18/12/2013 20:48, Andre wrote:
>  > => myURL.bstrVal = SysAllocString(cast(const(wchar*))url);
> 
> 
> Looks like the problem there is casting a string to a wchar* - I guess the resulting BSTR will contain garbage instead of the intended value.
> 
> 
>  >
>  > It only works with statement:
>  > myURL.bstrVal = cast(wchar*)"http://www.google.de";
>  >
> 
> 
> Treating a wchar* as a BSTR might cause unexpected things to happen - converting the string to a wchar* and then passing that to SysAllocString would be safer.

Oh yes, you are right and I was totally ignorant of what a BSTR is! It is a data structure for strings consisting of size prefix for the character data (4 bytes), the character data as wchars and a terminating zero wchar.

So your first approach was correct:

  string url = …;
  BSTR* bstrUrl = enforce(SysAllocString(toUTFz!(const(wchar)*)(url)),
                          "Out of memory or url is null");
  myURL.bstrVal = bstrUrl;

  …

  SysFreeString(bstrUrl);

-- 
Marco