Re: i would like to elaborate further - C / C++ / MFC Discussion Boards

Re: setting form element values using ie TCppWebBrowser control

Andrew J. Burke15-Oct-11 14:50

15-Oct-11 14:50

/* Well I got this far I get 3 errors in the BrowserDocumentComplete event:

(C++ Error)BrowserFrm.cpp(53): E2285 Could not find match for 'TBrowserFrame::GetHTMLItem<ParentIntf>TComInterface<IHTMLElementCollection,&GUID_NULL>,char *,IHTMLFormElement * *)'

(C++ Error)BrowserFrm.cpp(58): E2285 Could not find match for 'TBrowserFrame::GetHTMLItem<ParentIntf>TComInterface<IHTMLFormElement,&GUID_NULL>,char *,IHTMLInputElement* *)'

(C++ Error)BrowserFrm.cpp(59): E2285 Could not find match for 'TBrowserFrame::GetHTMLItem<ParentIntf>TComInterface<IHTMLFormElement,&GUID_NULL>,char *,IHTMLInputElement* *)' */

//I marked the lines with the errors below:

//BrowserFrm.cpp

#include <vcl.h>
#pragma hdrstop

#include "BrowserFrm.h"
#include <utilcls.h>
#include <mshtml.h>
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma link "SHDocVw_OCX"
#pragma resource "*.dfm"
TBrowserFrame *BrowserFrame;
//---------------------------------------------------------------------------
__fastcall TBrowserFrame::TBrowserFrame(TComponent* Owner)
: TFrame(Owner)
{
}
//---------------------------------------------------------------------------
void __fastcall TBrowserFrame::Go(AnsiString url)
{
Browser->Navigate(StringToOleStr(url),0,NULL,NULL,NULL);
}
//---------------------------------------------------------------------------
template<class ParentIntf, class ItemIntf>
HRESULT __fastcall TBrowserFrame::GetHTMLItem(ParentIntf *CollectionOrElement, const
WideString &name, ItemIntf** ppIntf)
{
TVariant vName = name;
TVariant vIndex = 0;
TComInterface disp;

HRESULT hRes = CollectionOrElement->item(vName, vIndex, &disp);
if( SUCCEEDED(hRes) )
hRes = disp->QueryInterface(__uuidof(ItemIntf),(LPVOID*)ppIntf);
return hRes;
}

//---------------------------------------------------------------------------
void __fastcall TBrowserFrame::BrowserDocumentComplete(TObject *Sender,
LPDISPATCH pDisp, Variant *URL)
{
if( Browser->Document )
{
TComInterface<IHTMLDocument2>HTMLDoc;
if(SUCCEEDED(Browser->Document->QueryInterface(
IID_IHTMLDocument2,(LPVOID*)&HTMLDoc) ) )
{
TComInterface<IHTMLElementCollection>forms;
if( SUCCEEDED(HTMLDoc->get_forms(&forms)) )
{
TComInterface<IHTMLFormElement>form;
/*Line 53 error*/ if( SUCCEEDED(GetHTMLItem(forms, "loginform", &form)) )
{
TComInterface<IHTMLInputElement>userid;
TComInterface<IHTMLInputElement>password;

/*Line 58 error*/ GetHTMLItem(form, "userid", &userid);
/*Line 59 error*/ GetHTMLItem(form, "password", &password);

if( userid )
{
userid->put_value(WideString("username"));
}

if( password )
{
password->put_value(WideString("password"));
}

form->submit();
}
}
}
}
}
//---------------------------------------------------------------------------

//BrowserFrm.h file

#ifndef BrowserFrmH
#define BrowserFrmH
//---------------------------------------------------------------------------
#include <Classes.hpp>
#include <Controls.hpp>
#include <StdCtrls.hpp>
#include <Forms.hpp>
#include "SHDocVw_OCX.h"
#include <OleCtrls.hpp>

#include <utilcls.h>
#include <mshtml.h>
//---------------------------------------------------------------------------

class TBrowserFrame : public TFrame
{
__published: // IDE-managed Components
TCppWebBrowser *Browser;
void __fastcall BrowserDocumentComplete(TObject *Sender,
LPDISPATCH pDisp, Variant *URL);

private: // User declarations
template<class ParentIntf, class ItemIntf>
HRESULT __fastcall GetHTMLItem(ParentIntf *CollectionOrElement, const
WideString &name, ItemIntf** ppIntf);

public: // User declarations
__fastcall TBrowserFrame(TComponent* Owner);
void __fastcall Go(AnsiString url);

};

//---------------------------------------------------------------------------
extern PACKAGE TBrowserFrame *BrowserFrame;
//---------------------------------------------------------------------------
#endif

-- modified 15-Oct-11 21:04pm.

Re: setting form element values using ie TCppWebBrowser control

App_15-Oct-11 20:58

App_

15-Oct-11 20:58

Change this line:

HRESULT __fastcall GetHTMLItem(ParentIntf *CollectionOrElement, const WideString &name, ItemIntf** ppIntf)

To this:

HRESULT __fastcall GetHTMLItem(TComInterface<ParentIntf> &CollectionOrElement, const WideString &name, ItemIntf** ppIntf)

Re: setting form element values using ie TCppWebBrowser control

Andrew J. Burke16-Oct-11 6:38

Andrew J. Burke

16-Oct-11 6:38

That Worked! It Fills the values but when I submit the form the web browser comes up with a dialog with a caption of: _ASSERTE: and Message of:
intf = 0 @ C:\Program Files\Borland\CBuilder6\Include\Vcl\utilcls.h/2916
Press[Y]es to terminate, [N]o to continue and [C]ancel to Debug

My code:

template<class ParentIntf, class ItemIntf>
HRESULT __fastcall TBrowserFrame::GetHTMLItem(TComInterface<ParentIntf> &CollectionOrElement, const WideString &name, ItemIntf** ppIntf)
{
TVariant vName = name;
TVariant vIndex = 0;
TComInterface<IDispatch>disp;

HRESULT hRes = CollectionOrElement->item(vName, vIndex, &disp);
if( SUCCEEDED(hRes) )
hRes = disp->QueryInterface(__uuidof(ItemIntf),(LPVOID*)ppIntf);
return hRes;
}

//---------------------------------------------------------------------------

void __fastcall TBrowserFrame::BrowserDocumentComplete(TObject *Sender,
LPDISPATCH pDisp, Variant *URL)
{
if( Browser->Document )
{
TComInterface<IHTMLDocument2>HTMLDoc;;
if(SUCCEEDED(Browser->Document->QueryInterface(
IID_IHTMLDocument2,(LPVOID*)&HTMLDoc) ) )
{
TComInterface<IHTMLElementCollection>forms;
if( SUCCEEDED(HTMLDoc->get_forms(&forms)) )
{
TComInterface<IHTMLFormElement>form;;
if( SUCCEEDED(GetHTMLItem(forms, "idpform", &form)) )
{
TComInterface<IHTMLInputElement>userid;
TComInterface<IHTMLInputElement>password;

GetHTMLItem(form, "txtUsername", &userid);
GetHTMLItem(form, "txtPassword", &password);

if( userid )
userid->put_value(WideString(username));

if( password )
password->put_value(WideString(pass));
//form->submit();
}
}
}
}
}
//---------------------------------------------------------------------------

Re: setting form element values using ie TCppWebBrowser control

App_16-Oct-11 7:44

App_

16-Oct-11 7:44

What you are likely seeing is a call to MessageBox() before the
exception is thrown. To turn that off, you can go into the Project
Options and add NO_PROMPT_ON_HRCHECK_FAILURE to the Conditionals list.
The exception will then be thrown without any prompting.

If you are still using the TComInterface wrapper, the '->' operator
validates whether the interface pointer is available or not. If it is
not, an ASSERT is thrown. To disable the prompt on that error, you
can define NO_PROMPT_ON_ASSERTE_FAILURE in the Project Options.

If you implement a try..catch block, it will catch errors normally without messagebox prompt interruptions.

(sample try catch)

try {
      buf = new char[512];
      if( buf == 0 )  throw "Memory allocation failure!";
    } 
catch( char * str ) {
      cout << "Exception raised: " << str << '\n';
    }

Re: setting form element values using ie TCppWebBrowser control

Andrew J. Burke18-Oct-11 5:16

Andrew J. Burke

18-Oct-11 5:16

Thankyou very much...every thing worked I added NO_PROMPT_ON_HRCHECK_FAILURE to the Conditionals list. and inserted a try/catch block around my code in the document complete event.

Now if every login page had the same names for their form & input names!

Clarification regarding Boolean variable

pix_programmer15-Oct-11 1:01

pix_programmer

15-Oct-11 1:01

Is there any difference between the following loops

C++

bool test;
do
{
  //some body

}
while(!test);

and

C++

bool test;
do
{
//some body

}
while(test==false);

Also what is the default value of boolean variable?

Re: Clarification regarding Boolean variable

André Kraak15-Oct-11 1:18

André Kraak

15-Oct-11 1:18

Both loops are the same.

~~The default value of boolean is false, but~~ You should never rely on the default value of a variable, if one is assigned (it might also be garbage) which depends on the compiler. For readability and to avoid possible problems always assign a initial value during variable declaration.

<Edit - default value boolean statement>

0100000101101110011001000111001011101001

modified 15-Oct-11 13:33pm.

Re: i would like to elaborate further

Software_Developer15-Oct-11 1:47

Software_Developer

15-Oct-11 1:47

Both code blocks behave in the same way.

ALWAYS initialize your variables before use:
In the C++ standard, only global variables get default value of zero
if they are not explicitly initialized. For local variables it's not required
for the complier to clean up the content of the memory they are assigned to.
A local variable - if not explicitly initialized - will contain a garbage value.

Code 1

// 0 = FALSE
// 1 = TRUE


bool test=0;
int i=0;

do
{
  //some body
    i++;
    cout<<i<<" ";

}
while(!test);

if test==false then we are stuck in an eternal loop forever.
However if test==true then we only loop once.

The same goes for
Code 2

// 0 = FALSE
// 1 = TRUE

bool test=0;
int i=0;

do
{
//some body
    i++;
cout<<i<<" ";

}
while(test==false);

if test==false then we are stuck in an eternal loop forever.
However if test==true then we only loop once.

Re: Clarification regarding Boolean variable

Albert Holguin15-Oct-11 7:24

Albert Holguin

15-Oct-11 7:24

Top coder is right, default values are not part of the standard. So it could be different from compiler to compiler, or completely random garbage.

Edit: changed my vote after your correction. Smile | :)

modified 15-Oct-11 20:12pm.

Re: Clarification regarding Boolean variable

MartyTPS15-Oct-11 16:48

MartyTPS

15-Oct-11 16:48

They are the same loops. both compile to a cmp to the value 0 instruction. you would get an unitialized variable warning when compiled. the default is whatever happened to be randomly in that location on the stack or in that register (optimized into a register) previously (usually true, but not specified).

Re: Clarification regarding Boolean variable

Pranit Kothari16-Oct-11 20:38

Pranit Kothari

16-Oct-11 20:38

If you are asking about default value, it will completely compiler dependent. Even if you work on release or debug build, don't surprise to see different results. Better idea is to explicitly initialize the value. Even in other cases, like by default Class members are private and structure members are public. Don't rely on defaults, explicitly write what you want.

Regards

Re: Clarification regarding Boolean variable

Chuck O'Toole17-Oct-11 5:01

Chuck O'Toole

17-Oct-11 5:01

never, Never, NEVER rely on any "default initialization" ever happening.

Always, and I cannot say this strongly enough, ALWAYS initialize your variables if you are depending on them having some value when you start.

Over your lifetime of programming, you will be far happier and successful if you burn that idea into your brain and you will spend far less time chasing "unitialized variable" bugs. Others will come to you for debugging help and you will say 'did you look for unitialized variables' and they will say 'no' and solve their problem and you will look like a genius.

Take this advice to heart.

Progress Window, where to attach

jkirkerx14-Oct-11 9:42

jkirkerx

14-Oct-11 9:42

I'm making a progress window for my Program, that is MDI. The progress window will show progress when a windows service is starting or stopping.

I wanted to make the progress window sort of universal, in which the Master Window owns it, and not the MDIChild Window,

I sort of confused here. I need the HWND from the master window to use in CreateWindowEx, but quite sure how to get it, Because I'm loading the Progress Windows from an MDIChild Window, and my create window fails. Actually I'm modeling the window first to make sure it works and looks right before I fully implement it.

BOOL ProgressBar_Popup::_show_ProgressWindow( HINSTANCE hInstance, HWND cWnd ) 
{

	LPWSTR					windowTitle						= L"Progress";

	// Font Variables
	HDC						hdc;

	// Get the Parent HWND
	gProgressBar_Popup_GAC = cWnd;

	// Get the current HDC
	hdc = GetDC(cWnd);
	hProgressBar_Popup_Instance = hInstance;
	
	LoadString(hProgressBar_Popup_Instance, IDC_PROGRESSBAR_POPUP, sz_ProgressBar_Popup_Class, MAX_LOADSTRING);

	// Create and Register the Popup Window
	_register_ProgressBar_Popup_Class(hInstance);
	hProgressBar_Popup = _create_ProgressBar_Popup(hInstance, windowTitle);
	_progressbar_Popup_Center( gProgressBar_Popup_GAC, hProgressBar_Popup );


	return TRUE;
}

ATOM ProgressBar_Popup::_register_ProgressBar_Popup_Class(HINSTANCE hInstance)
{
    WNDCLASSEX wcex;
	wcex.cbSize        = sizeof(WNDCLASSEX);

    wcex.style         = CS_HREDRAW | CS_VREDRAW;
    wcex.lpfnWndProc   = (WNDPROC) _progressbar_Popup_WndProc;
    wcex.cbClsExtra    = 0;
    wcex.cbWndExtra    = 0;
    wcex.hInstance     = hInstance;
    wcex.hIcon         = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_NASE2012_SUWIZARD));
    wcex.hCursor       = LoadCursor(NULL, IDC_ARROW);
    wcex.hbrBackground = (HBRUSH)GetStockObject( WHITE_BRUSH );
	wcex.lpszMenuName  = NULL; 
    wcex.lpszClassName = sz_ProgressBar_Popup_Class;
    wcex.hIconSm       = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));

	if (!RegisterClassEx(&wcex))
    {
        MessageBox(NULL,
            _T("Call to RegisterClassEx failed!"),
            _T("Win32 Guided Tour"),
            NULL);        
    }

    return RegisterClassEx(&wcex);
}

HWND ProgressBar_Popup::_create_ProgressBar_Popup(HINSTANCE hInstance, LPWSTR windowTitle)
{ 
	HWND hWnd = CreateWindowEx(
		WS_EX_TOPMOST,
        sz_ProgressBar_Popup_Class,         
        windowTitle,
		WS_POPUPWINDOW,    
        10, 10,                 
        200, 200,               
        gProgressBar_Popup_GAC,
		NULL,             
        hInstance,
		NULL
	);	

	if ( !hWnd ) 
	{
		// Create Window has failed
		MessageBox(hWnd,
			L"Progress Bar Popup has failed",
            L"Progress Bar Popup",
			MB_ICONEXCLAMATION | MB_OK);
	}
	else
	{
		ShowWindow(hWnd, SW_SHOW );
		UpdateWindow(hWnd);

	}

	return hWnd;
    
}

Re: Progress Window, where to attach

David Crow14-Oct-11 10:06

David Crow

14-Oct-11 10:06

Have you considered just showing progress bar in a status bar pane[^]?

"One man's wage rise is another man's price increase." - Harold Wilson

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

"Show me a community that obeys the Ten Commandments and I'll show you a less crowded prison system." - Anonymous

Re: Progress Window, where to attach

jkirkerx14-Oct-11 10:38

jkirkerx

14-Oct-11 10:38

I went to lunch and came back, with a new idea, so I deleted the stuff I wrote, and will try to create a some sort of dialog box in the main.cpp.

I have a status bar, but haven't figured out what to put in it, or how to access it.

Re: Progress Window, where to attach

Richard MacCutchan14-Oct-11 23:02

Richard MacCutchan

14-Oct-11 23:02

Why not use the ready made ProgressBar[^] from Microsoft?

Unrequited desire is character building. OriginalGriff

Re: Progress Window, where to attach

jkirkerx15-Oct-11 7:02

jkirkerx

15-Oct-11 7:02

I thought it would be a good lesson for to learn how create various windows, and at the time, I was thinking in consumer mode. The progress bar looks very difficult for me now, so I will just create a message or popup window saying that the service is starting or stopping.

Thanks for the suggestion, I'm going to skip ahead to the next task, which is trying to figure out how to delete text I made with drawtext.

Re: Progress Window, where to attach

Richard MacCutchan15-Oct-11 7:09

Richard MacCutchan

15-Oct-11 7:09

jkirkerx wrote:
The progress bar looks very difficult for me now

I would suggest you look a bit harder. This is quite an easy control to implement and all the hard work of painting the bar is done for you; all you have to do is set the limits and update the amount completed from time to time. I'm sure if you do an article search here on CodeProject you will find some sample code to help you.

Unrequited desire is character building. OriginalGriff

Re: Progress Window, where to attach

jkirkerx15-Oct-11 8:13

jkirkerx

15-Oct-11 8:13

Or perhaps I will just trip over it by accident, Just Joking, and I like the motivational push forward you gave me. Actually after a complete day of failure or experimenting, Things are clearer for me now in the c++ windows world.

I went on to the next project, some sort of Label control in c++, and found that I can use CreateWindow to make a Label, Textbox, ComboBox, and a Progress Bar.

So I replaced my Drawtext and created a STATIC in the same place, and I will make a progress bar under it.

Since I painted by background white, I need to figure out how to paint the Label and Progress background white as well.

// Create the Operational Status Text
		txt_Website_Default_Status = CreateWindow(TEXT("STATIC"), TEXT("Press Next to begin the programming"), WS_CHILD | WS_VISIBLE | SS_LEFT,
			winWidth - 300,
			winHeight - 250,
			275, 20, hWebsite_Default, (HMENU)IDC_WEBSITE_DEFAULT_LABEL, GetModuleHandle(NULL), 0
		);
		SendMessage(txt_Website_Default_Status, WM_SETFONT, (WPARAM)hFont_Label, FALSE);
		ShowWindow(txt_Website_Default_Status, SW_SHOW);

Re: Progress Window, where to attach

Richard MacCutchan15-Oct-11 21:24

Richard MacCutchan

15-Oct-11 21:24

jkirkerx wrote:
I need to figure out how to paint the Label and Progress background white as well.

I am not certain, but I think you have to use Subclassing[^] in order to do that.

Unrequited desire is character building. OriginalGriff

Re: Progress Window, where to attach

jkirkerx16-Oct-11 6:53

jkirkerx

16-Oct-11 6:53

I ended up adding this to the WndProc, Looks like it paints the background on STATIC.

Yesterday was a big day, I learned how to create controls, and handle them during the wizard process, in which the window updates with progress status text and the progress bar.

Today I will try to figure out how to paint the progress bar to the default theme.

case WM_CTLCOLORSTATIC:
            SetBkMode(hdcStatic, TRANSPARENT);
            return (LONG)hbrBackground_White;
            break;

Re: Progress Window, where to attach

Richard MacCutchan16-Oct-11 7:16

Richard MacCutchan

16-Oct-11 7:16

Good catch, I had forgotten about that message.

Unrequited desire is character building. OriginalGriff

Getting IP Address from IP Control

pandit8414-Oct-11 2:42

pandit84

14-Oct-11 2:42

Hi ,
I am trying to get IP Address from an IP Control using below code. But I am getting an IP Address in Reverse Order , like if my IP Contrl has 123.45.67.89 , then inet_ntoa () method return address as 89.67.45.123. Can you provide any information on how to get IP Address from IP Control.

C++

DWORD dwIPAddress ;
::SendMessage (hwndIPAddress,IPM_GETADDRESS,0, (LPARAM) (LPDWORD) &dwIPAddress ) ;
struct in_addr addr;	
addr.S_un .S_addr = (ULONG)dwIPAddress ;
char *IPAddres = new char[9] ;
IPAddres = inet_ntoa (addr) ;

Re: Getting IP Address from IP Control

«_Superman_»14-Oct-11 3:12

«_Superman_»

14-Oct-11 3:12

DWORD dwIPAddress = 0;
::SendMessage (hwndIPAddress, IPM_GETADDRESS, 0, (LPARAM)&dwIPAddress);
struct in_addr addr;	
addr.S_un.S_addr = (ULONG)dwIPAddress ;
char IPAddress[16] ;
sprintf(IPAddress, "%d.%d.%d.%d", addr.S_un.s_b1, addr.S_un.s_b2, addr.S_un.s_b3, addr.S_un.s_b4);

«_Superman_»
I love work. It gives me something to do between weekends.

Microsoft MVP (Visual C++)

Polymorphism in C

Re: Getting IP Address from IP Control

pandit8414-Oct-11 3:15

pandit84

14-Oct-11 3:15

Thanks you suparman.... Thumbs Up | :thumbsup:

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