C / C++ / MFC

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

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

sudeep_br9-Apr-06 4:31

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

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

sudeep_br9-Apr-06 18:01

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

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)

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

sheshidar9-Apr-06 6:36

sheshidar

9-Apr-06 6:36

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

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

sudeep_br9-Apr-06 18:03

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

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

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

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

borono8-Apr-06 16:02

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.

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

borono8-Apr-06 17:20

8-Apr-06 17:20

I used #include <atlconv.h>.. was that not right? What is the name of the includes I need?

thanks in advance.

-- modified at 1:21 Sunday 9th April, 2006

EDIT: I took another look at the second guide and figured out what I needed to do. Thanks a lot for the all the help. This is solved.

best regards

Waldermort8-Apr-06 20:14

Waldermort

8-Apr-06 20:14

Hi borono,

Still having problems? Have a look here[^]. This function will allow you to convert a char* which is a C string to a BSTR.

Maybe there are better methods of doing this from VB though.

Waldermort8-Apr-06 20:24

Waldermort

8-Apr-06 20:24

I believe I have found the answer you are looking for right here[^]. Now if you don't have this up and working by the end of the day I am personaly going to come and steal your computer Poke tongue | ;-P

borono9-Apr-06 4:35

9-Apr-06 4:35

haha, no worries. I do have it working, here is what I did.

DLL Side:


#include <comdef.h>

template< class T >
BSTR ToBSTR( T a_Str )
{
     return( _bstr_t(a_Str).copy() ) ;
}


extern "C" void __stdcall stat( void (*cb) (u_short**) )
{
		char dao[100];  //way too much is better than way too little
	        sprintf(dao,"UDP: %d",udp); //do the work here, your faster
		BSTR l_Temp = ToBSTR(dao); // convert to BSTR
		BSTR bs = SysAllocString ( l_Temp ); //make it
		cb( &bs );  //send it
		SysFreeString ( bs ); //free it
		bs = NULL; //null it
}

VB Side:

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

works great! computer saved. Smile | :)

best regards

-- modified at 10:37 Sunday 9th April, 2006

EDIT: thought it would be a good idea to include the conversion function, considering without it, this code is useless. Bold represents the modificiation.