C / C++ / MFC Discussion Boards

Hamid_RT9-Apr-06 6:10

9-Apr-06 6:10

Hi big_denny_200

but(why x is 52)

__int32 x = 0;
__int32 x2 = 0;

char *str = "/01234aA";
x = str[0],str[1],str[2],str[3];//->47

x2 = (str[0],str[1],str[2],str[3]);//-->50

__int32 m_check=0;
m_check=str[0];//47
m_check=str[1];//48
m_check=str[2];//49
m_check=str[3];//50
m_check=str[4];//51
m_check=str[5];//52
m_check=str[6];//97
m_check=str[7];//65

//m_check is 65,Now whats test?

char *test;
test=(char*)&m_check;
//test is A

A=65

Do you know ascii code?
if you press Alt+65 then print A or if you pree Alt+97 then print a

Right?

-- modified at 12:30 Sunday 9th April, 2006

Re: int32 = (char1,char2,char3,char4)

Stephen Hewitt9-Apr-06 14:02

Stephen Hewitt

9-Apr-06 14:02

If we convert to string to ASCII (numbers in brackets are decimal):
"1234" -> 0x31(49) 0x32(50) 0x33(51) 0x34(52) 0x00(0)

Now operator, returns its second parameter. i.e. (1st, 2nd) evaluates to 2nd.

So the expression (str[0],str[1],str[2],str[3]) evaluates to (str[1],str[2],str[3]) which evaluates to (str[2],str[3]) which in turn yields (str[3]) - Which is 52.

Steve

3D Game Engine Architecture's web

akira329-Apr-06 1:26

akira32

9-Apr-06 1:26

I bought a book called "3D Game Engine Architecture's ".
There are two web addresses(as beblow) in this book.
These web addreses are not active(link failure) now.
Someone could know the web address change to what?

// Magic Software, Inc.
// http://www.magic-software.com
// http://www.wild-magic.com
// Copyright © 2004.　All Rights Reserved

Re: 3D Game Engine Architecture's web

BEamer9-Apr-06 3:07

BEamer

9-Apr-06 3:07

Current website is: http://www.geometrictools.com/

File Icon

big_denny_2008-Apr-06 23:38

big_denny_200

8-Apr-06 23:38

Hi all

lets say I have a file path c:\\foo.txt

How can I determine what Icon is set to it ?

thanks.

PS. I have an edit box with fileBrowse buttons and when user loads some file I want to display the file path in the edit box and its icon below.

Re: File Icon

Hamid_RT9-Apr-06 0:05

Hamid_RT

9-Apr-06 0:05

Hi big_denny_200,
What do you need? show path from file or insert icon to editbox
if you need to insert icon to editbox
maybe it is some helpful to you

http://www.codeproject.com/editctrl/editwithicon.asp[^]

Re: File Icon

RChin9-Apr-06 1:07

RChin

9-Apr-06 1:07

Have a look at the SHGetFileInfo() API function.
Also look at this[^] article, it looks like what you are after.

<EDIT>
I've just realised that the sample article is for a C#, but the concept should be the same
<EDIT>

I Dream of Absolute Zero

-- modified at 7:09 Sunday 9th April, 2006

intellisense with directx

blue_rabbit8-Apr-06 20:59

blue_rabbit

8-Apr-06 20:59

When i programming with directx, seem i can't not use intellisense. So it't hard to remember the params.
May you help me.

Re: intellisense with directx

Trollslayer8-Apr-06 22:56

Trollslayer

8-Apr-06 22:56

Do you have two copies of Visual Studio open? That can stop Intellisense working.

The tigress is here Big Grin | :-D

pointer to function in class

blue_rabbit8-Apr-06 20:43

blue_rabbit

8-Apr-06 20:43

Hi, I get the problem again.
Thank to everyone help me!
My problem is that I have a pointer_to_function as member of my class. But I can't use this pointer to point to one of my member functions. More detail: I wrote a code like this:
int global_display(){
cout<<"global_display()"<

Re: pointer to function in class

Matt Godbolt8-Apr-06 22:43

Matt Godbolt

8-Apr-06 22:43

The syntax for member function pointers is rather confusing. If you want to get your code compiling so as you can call 'display_1', try:

int global_display(){
	cout<<"global_display()"<<endl;
	return 0;
};
class test{
public:
	test();//constructor
	int (test::*myfun)();//the pointer_to_function
	int display1();//the member function
	int maindisplay();
};
int test::display1(){
	cout<<"display1()"<<endl;
	return 0;
};
int test::maindisplay(){
	(this->*myfun)();
	return 0;
};
test::test(){
	myfun = &test::display1;
	//myfun = global_display;
};

The main changes: firstly the constructor should not return 'int'. Then, the member function's declaration has to change to show it's a member function and not a non-member function. The invocation also has to change to use the ->* operator (or .* if you were calling a reference, in this case the object itself is calling, so we have to use this->*). Finally, the function reference has to be bound with the ampersand, and the classname too. This code was tested in VS2005 and VS2003.

Matt Godbolt
Engineer, ProFactor Software
StyleManager project

vc++

sudeep_br8-Apr-06 15:43

sudeep_br

8-Apr-06 15:43

Hi i have added a dialog box and sone buttons like ok button to it. i want the ok button to be disabled when the dialog box is initially displayed.how do i do this

sud

Re: vc++

EvScott8-Apr-06 16:36

EvScott

8-Apr-06 16:36

Try this bit of code.

BOOL CYourDlg::OnInitDialog()
{
CDialog::OnInitDialog();
//pointer to your button
CButton *pButton = (CButton*)this->GetDlgItem(IDC_BUTTON1);
pButton->EnableWindow(FALSE);
}

EvScott

Re: vc++

sudeep_br9-Apr-06 4:31

sudeep_br

9-Apr-06 4:31

EvScott wrote:
BOOL CYourDlg::OnInitDialog()
{
CDialog::OnInitDialog();
//pointer to your button
CButton *pButton = (CButton*)this->GetDlgItem(IDC_BUTTON1);
pButton->EnableWindow(FALSE);
}

Thanks for ur response. when i entered the above code i got a warning
"warning C4005: 'IDC_SIZE' : macro redefinition
see previous definition of 'IDC_SIZE'"

Please tell me what is wrong

Thanks

Re: vc++

EvScott9-Apr-06 5:30

EvScott

9-Apr-06 5:30

Compiler Warning (level 1) C4005
'identifier' : macro redefinition

The given identifier was defined twice. The compiler used the second macro definition.

Sudeep, observe the above which is an excerpt from MSDN. Make sure that you have only ONE identifer named "IDC_SIZE". The compiler will complain otherwise. Hope that this helps

EvScott

Re: vc++

sudeep_br9-Apr-06 18:01

sudeep_br

9-Apr-06 18:01

EvScott wrote:
Compiler Warning (level 1) C4005
'identifier' : macro redefinition

The given identifier was defined twice. The compiler used the second macro definition.

Sudeep, observe the above which is an excerpt from MSDN. Make sure that you have only ONE identifer named "IDC_SIZE". The compiler will complain otherwise. Hope that this helps

idc_size is defined using #define only once. pls tell me where else can this declaration be found? i tried but cudn't get the solution

Thanks

Re: vc++

Hamid_RT9-Apr-06 20:04

Hamid_RT

9-Apr-06 20:04

Hi sudeep_br,
I suggestion that you change IDC_SIZE to exmaple IDC_SIZE2
and run again?whats happen?

-- modified at 2:10 Monday 10th April, 2006
and
m_yourButton.EnableWindow(0)

Re: vc++

Michael Dunn8-Apr-06 16:38

Michael Dunn

8-Apr-06 16:38

See the FAQ
4.6 How do I enable or disable a dialog control (button, edit box, etc.)?[^]

--Mike--
Visual C++ MVP Cool | :cool:

LINKS~! Ericahist | NEW!! PimpFish | CP SearchBar v3.0 | C++ Forum FAQ

Re: vc++

sheshidar9-Apr-06 6:36

sheshidar

9-Apr-06 6:36

BOOL ProjectName::OnInitDialog()
{
CDialog::OnInitDialog();

GetDlgItem( IDC_Button )->EnableWindow(FALSE);´
}

Re: vc++

sudeep_br9-Apr-06 18:03

sudeep_br

9-Apr-06 18:03

sheshidar wrote:
BOOL ProjectName::OnInitDialog()
{
CDialog::OnInitDialog();

GetDlgItem( IDC_Button )->EnableWindow(FALSE);´
}

Thanks for ur response. when i entered the above code i got a warning
"warning C4005: 'IDC_SIZE' : macro redefinition
see previous definition of 'IDC_SIZE'"

Please tell me what is wrong .where shud i make changes

sudeep

Re: vc++

David Crow10-Apr-06 3:48

David Crow

10-Apr-06 3:48

The easiest way is to check the "Disabled" box in the resouce editor.

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

DLL to VB callback help

borono8-Apr-06 13:56

borono

8-Apr-06 13:56

Thought I had this done, realised I would be sending strings as well and have had major trouble making it happen. I am trying to use a DLL I wrote in VC6 to send a string, via callback, to a VB app I wrote in VB6. Below is the code I am using on both the DLL and VB projects.

DLL Side:

extern "C" void __stdcall stat( void (*cb) (char**) )
{
	char* nrMsg = "This is a test!";
        cb( &nrMsg );

}

VB Side:

Declare Sub stat Lib "mydll.dll" (ByVal funcptr As Long)
'
Sub CallbackFunction(ByRef numb As Long)
    Form1.Label1.Caption = "Success: " + Str(numb)
End Sub

Output:

Success: 268486828

I know I have to convert it to BSTR Unicode, but do not know how or what includes are needed. Not exactly sure how to pull that data in on the VB side either. All information I have seen thus far was all theoretical, so an example would be great concerning both sides (i.e., DLL and VB sides). I will eventually need to pass around 12 strings and 12 integers at one time.

If you need more info, let me know. Thanks in advance

Best Regards

Re: DLL to VB callback help

Michael Dunn8-Apr-06 15:14

Michael Dunn

8-Apr-06 15:14

borono wrote:

I know I have to convert it to BSTR Unicode, but do not know how or what includes are needed.

See my C++ strings guide: Part 1[^] Part 2[^]

--Mike--
Visual C++ MVP Cool | :cool:

LINKS~! Ericahist | NEW!! PimpFish | CP SearchBar v3.0 | C++ Forum FAQ

Re: DLL to VB callback help

borono8-Apr-06 16:02

borono

8-Apr-06 16:02

Hey, thanks a lot for showing me your guides. I never new that Japanese users could have problems with certain code, even though it works perfectly for English users. Also, never knew that strings in C are an array of chars. Good information, well written. Still I have questions and need some help building an example. Here is my effort, which doesn't work.

#include <atlconv.h>

void Baz ( BSTR* pbstr );

/* Do Callback */
extern "C" void __stdcall stat( void (*cb) (char**) )
{
        using std::string;
        USES_CONVERSION;
        LPCWSTR wsz = L"Test this is.";
        BSTR bs1;
        bs2.Attach ( W2BSTR(wsz) );
        cb ( bs1 );
        SysFreeString ( bs1 );
}

I think I am just confused, because here is the compile errors and warnings:

C:\Program Files\Microsoft Visual Studio\VC98\ATL\INCLUDE\atlconv.h(48) : error C2065: '_ASSERTE' : undeclared identifier
C:\Program Files\Microsoft Visual Studio\VC98\ATL\INCLUDE\atlconv.h(122) : error C2065: 'LPCOLESTR' : undeclared identifier
C:\Program Files\Microsoft Visual Studio\VC98\ATL\INCLUDE\atlconv.h(122) : error C2146: syntax error : missing ')' before identifier 'x'
C:\Program Files\Microsoft Visual Studio\VC98\ATL\INCLUDE\atlconv.h(122) : error C2433: 'ocslen' : 'inline' not permitted on data declarations
C:\Program Files\Microsoft Visual Studio\VC98\ATL\INCLUDE\atlconv.h(122) : error C2059: syntax error : ')'
C:\Program Files\Microsoft Visual Studio\VC98\ATL\INCLUDE\atlconv.h(122) : error C2143: syntax error : missing ';' before '{'
C:\Program Files\Microsoft Visual Studio\VC98\ATL\INCLUDE\atlconv.h(122) : error C2447: missing function header (old-style formal list?)
C:\Program Files\Microsoft Visual Studio\VC98\ATL\INCLUDE\atlconv.h(123) : error C2143: syntax error : missing ';' before '*'
C:\Program Files\Microsoft Visual Studio\VC98\ATL\INCLUDE\atlconv.h(123) : error C2433: 'OLECHAR' : 'inline' not permitted on data declarations
C:\Program Files\Microsoft Visual Studio\VC98\ATL\INCLUDE\atlconv.h(123) : error C2501: 'OLECHAR' : missing storage-class or type specifiers
C:\Program Files\Microsoft Visual Studio\VC98\ATL\INCLUDE\atlconv.h(123) : error C2061: syntax error : identifier 'LPOLESTR'
C:\Program Files\Microsoft Visual Studio\VC98\ATL\INCLUDE\atlconv.h(123) : error C2501: 'ocscpy' : missing storage-class or type specifiers
C:\Program Files\Microsoft Visual Studio\VC98\ATL\INCLUDE\atlconv.h(123) : error C2065: 'dest' : undeclared identifier
C:\Program Files\Microsoft Visual Studio\VC98\ATL\INCLUDE\atlconv.h(123) : error C2065: 'src' : undeclared identifier
C:\Program Files\Microsoft Visual Studio\VC98\ATL\INCLUDE\atlconv.h(123) : warning C4508: 'ocscpy' : function should return a value; 'void' return type assumed
C:\Program Files\Microsoft Visual Studio\VC98\ATL\INCLUDE\atlconv.h(124) : error C2143: syntax error : missing ';' before '*'
C:\Program Files\Microsoft Visual Studio\VC98\ATL\INCLUDE\atlconv.h(124) : error C2433: 'OLECHAR' : 'inline' not permitted on data declarations
C:\Program Files\Microsoft Visual Studio\VC98\ATL\INCLUDE\atlconv.h(124) : error C2501: 'OLECHAR' : missing storage-class or type specifiers
C:\Program Files\Microsoft Visual Studio\VC98\ATL\INCLUDE\atlconv.h(124) : error C2086: 'OLECHAR' : redefinition
C:\Program Files\Microsoft Visual Studio\VC98\ATL\INCLUDE\atlconv.h(124) : error C2061: syntax error : identifier 'LPOLESTR'
C:\Program Files\Microsoft Visual Studio\VC98\ATL\INCLUDE\atlconv.h(124) : error C2501: 'ocscat' : missing storage-class or type specifiers
C:\Program Files\Microsoft Visual Studio\VC98\ATL\INCLUDE\atlconv.h(124) : warning C4508: 'ocscat' : function should return a value; 'void' return type assumed
C:\Program Files\Microsoft Visual Studio\VC98\ATL\INCLUDE\atlconv.h(125) : error C2146: syntax error : missing ';' before identifier 'T2COLE'
C:\Program Files\Microsoft Visual Studio\VC98\ATL\INCLUDE\atlconv.h(125) : error C2433: 'LPCOLESTR' : 'inline' not permitted on data declarations
C:\Program Files\Microsoft Visual Studio\VC98\ATL\INCLUDE\atlconv.h(125) : error C2501: 'LPCOLESTR' : missing storage-class or type specifiers
C:\Program Files\Microsoft Visual Studio\VC98\ATL\INCLUDE\atlconv.h(125) : fatal error C1004: unexpected end of file found
Error executing cl.exe.

Could someone take a look at what I have and show me what I have done wrong? I really need an example, never been a good non-hands-on learner. Thanks in advance.

best regards

-- modified at 22:03 Saturday 8th April, 2006

EDIT: Fixed to show include.

Re: DLL to VB callback help

Michael Dunn8-Apr-06 16:34

Michael Dunn

8-Apr-06 16:34

Your code sample doesn't make sense, but it looks like you're not using BSTR correctly. You also appear to not have the ATL or OLE headers included, so that's giving you the majority of the compiler errors. Start simple:

BSTR bs = SysAllocString ( L"Hello Bob" );
// use bs here...
SysFreeString ( bs );
bs = NULL;

--Mike--
Visual C++ MVP Cool | :cool:

LINKS~! Ericahist | NEW!! PimpFish | CP SearchBar v3.0 | C++ Forum FAQ

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