C / C++ / MFC

Thanx you very much!!!!!! (;))

21-Apr-03 4:56

You have to check it explicitly. Probably best to wrap this in a function:

CString VariantToString( const _variant_t& var )
{
	if ( var.vt == VT_EMPTY || var.vt == VT_NULL )
	{
		return CString( );
	}
	else
	{
		_bstr_t bstrVar( var );
		CString strVar( (LPCWSTR)bstrVar );
		return strVar;
	}
}

and then use it like this:

CString x = VariantToString( pRs_SP->Fields->Item["id_symposium"]->Value );

Wenn ist das Nunstück git und Slotermeyer? Ja! Beierhund das oder die Flipperwaldt gersput!

Martin_Viet21-Apr-03 5:10

Martin_Viet

21-Apr-03 5:10

Efficient method to convert decimal string to hex string and vice versa.

George221-Apr-03 4:18

Re: Efficient method to convert decimal string to hex string and vice versa.

21-Apr-03 4:18

Hi, everyone!

I am writing two small funtions, one is used to change from
hex string to decimal string, and the other one is vice versa.

For example, I simply use sprintf(..."%X" ...) to change from
decimal string to hex string and use "%02X" to set filling
character. When changing from decimal to hex, I need two functions
one of which will put 0 before the converted value if it is only
one bit, for example, 10 --> 0A. Another one do not have the function,
for example, 10 --> A. When changing from decimal to hex, I need
only one function. I want to know whether there are some more effienet
ways?

Thanks in adavnce,
George

David Crow21-Apr-03 8:13

David Crow

21-Apr-03 8:13

Use strtol() to convert from base 16 to base 10.

Re: Efficient method to convert decimal string to hex string and vice versa.

George221-Apr-03 16:26

Re: Efficient method to convert decimal string to hex string and vice versa.

21-Apr-03 16:26

Thanks, DavidCrow buddy!

George

George221-Apr-03 17:05

Re: Efficient method to convert decimal string to hex string and vice versa.

21-Apr-03 17:05

Thanks, DavidCrow buddy!

I have another question. How to change from base 10
to another base? The function strtol() you introduced
to me can only change from base 16 to base 10.

regards,
George

David Crow22-Apr-03 2:26

David Crow

22-Apr-03 2:26

Have you tried itoa()?

int num = 1234;
char str[32];
itoa(num, str, 8); // convert to octal

Re: Efficient method to convert decimal string to hex string and vice versa.

George222-Apr-03 19:41

Using VS.NET help with VS 6.0

22-Apr-03 19:41

Thanks, DavidCrow buddy!

George

dabs21-Apr-03 4:11

IE: Check if GoBack and GoForward is possible

21-Apr-03 4:11

Has anyone done this? I currently have both Visual Studio 6.0 and VS.NET installed and would like to use the latest help system in both environments.

The way things are set up right now, I get the annoying message "The MSDN collection does not exist. Please reinstall MSDN." when I press F1 in VS 6.0. Things however work as expected in VS.NET.

Anyone?

Wenn ist das Nunstück git und Slotermeyer? Ja! Beierhund das oder die Flipperwaldt gersput!

Dominik Reichl21-Apr-03 4:11

Dominik Reichl

21-Apr-03 4:11

Hello,

I am currently programming an application which embeds the Internet Explorer to display HTML pages.

I want to provide the users buttons like 'Go Back' and 'Go Forward'. It is easy to make the Internet Explorer do this (member functions .GoBack() and .GoForward()), but an error messagebox pops up if I call GoBack and am on the start page (so there is no previous page).

Is it possible to supress these messageboxes
-or-
How can I check if a previous/next page is available?

Confused | :confused:

-Dominik

_outp(0x64, 0xAD);
and
__asm mov al, 0xAD __asm out 0x64, al
do the same... but what do they do??

dabs21-Apr-03 4:47

21-Apr-03 4:47

IE notifies you when you can and can't go back/forward. Intercept the OnCommandStateChange event (DISPID_COMMANDSTATECHANGE):

void __stdcall CWebBrowserWindow::OnCommandStateChange( 
	/*[in]*/ long Command, /*[in]*/ VARIANT_BOOL Enable )
{
	switch( Command )
	{
	case CSC_NAVIGATEFORWARD:
		m_bCanGoForward = ( Enable == VARIANT_TRUE ) ? true : false;
		break;
	case CSC_NAVIGATEBACK:
		m_bCanGoBack = ( Enable == VARIANT_TRUE ) ? true : false;
		break;
	default:
		//CSC_UPDATECOMMANDS = 0xFFFFFFFF
		break;
	}
}

Wenn ist das Nunstück git und Slotermeyer? Ja! Beierhund das oder die Flipperwaldt gersput!

Dominik Reichl21-Apr-03 5:08

Dominik Reichl

21-Apr-03 5:08

Where shall I implement this function? In my main application? If in my main application, how do I tell IE to use this callback function?

Thanks for your help!
-Dominik

_outp(0x64, 0xAD);
and
__asm mov al, 0xAD __asm out 0x64, al
do the same... but what do they do??

dabs21-Apr-03 5:38

21-Apr-03 5:38

I can tell you exactly how to do this if you are using ATL/WTL but I haven't got the code available for an MFC implementation. Basically what you have to do is to register with the web browser control that you want to receive events from it and then intercept the messages you want. In MFC you would probably use the BEGIN_EVENTSINK_MAP macro just to give you a hint.

Wenn ist das Nunstück git und Slotermeyer? Ja! Beierhund das oder die Flipperwaldt gersput!