C / C++ / MFC Discussion Boards

ThatsAlok5-Jun-05 18:09

5-Jun-05 18:09

quangcanh wrote:
Then, defined a new user message (WM_USER +1) in CMyProjectView using macro ON_MESSAGE. Then, I write a function in CMainFrame and used SendMessage method to send message (WM_USER+1) to CMyProjectView.
Result: The message I sent couldn't receive in CMyProjectView.
But, I send a message from CMyProjectView to CMainFrame, is Ok.

Have you declared TWO ON_MESSAGE Handller for WM_USER+1 , i.e. One in CMyProjectView and One in CMainFrame?

In that case, Above mentioned Behavoiur is correct as View always recieve message before MainFrame class.

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta

Re: A question about SendMessage in MFC

inew5-Jun-05 18:27

inew

5-Jun-05 18:27

Dear ThaksAlok,
I declared one handler WM_USER+1 in CMyProjectView class only, and I sent a message from CMainFrame to CMyProjectView, but in CMyProjectView couldn't receive this message.
Can you describe more clearly, if you have one project to demo, you send it to me.
Thanks and best regards!

quangthien

Re: A question about SendMessage in MFC

ThatsAlok5-Jun-05 19:29

ThatsAlok

5-Jun-05 19:29

quangcanh wrote:
sent a message from CMainFrame to CMyProjectView, but in CMyProjectView couldn't receive this message.

Use CMainFrame::GetActiveView( ) to send Message i.e.

((Your View Class *) this->GetActiveView())->PostMessage(WM_USER+1,0,0);

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta

Re: A question about SendMessage in MFC

Nilesh K.5-Jun-05 22:08

Nilesh K.

5-Jun-05 22:08

Check here[^]

<bold>- Nilesh
<italics>
"Reading made Don Quixote a gentleman. Believing what he read made him mad" -George Bernard Shaw

Re: A question about SendMessage in MFC

MailtoGops6-Jun-05 5:03

MailtoGops

6-Jun-05 5:03

Hi,

You should understand how sendmessage and postmessage works.

If you post a message, that message is send to application message queue and mfc framework gets that message from the application message queue and dispatch it to appropriate window. Where you will define your message handlers to process the message. Windows uses virtual functions to call to your overrided functions. In case of SendMessage, that message is send to the Windows procdure not the application queue. So you won't get the message.

Thanks & Regards,

Gopal

" Action without vision is only passing time,
Vision without action is merely day dreaming,
But vision with action can change the world "

- Words from Nelson Mandela

Thanks & Regards,

Gopalakrishnan

A question about CRichEditCtrl

fanlovefan5-Jun-05 15:31

fanlovefan

5-Jun-05 15:31

I create a MFC project with Dialog based and I put a CRichEditCtrl into the dialog.

when I run the project,it has nothing.

Should I do before running the project?

Do I initialize the CRichEditCtrl?

Thank you!

Re: A question about CRichEditCtrl

Christian Graus5-Jun-05 15:42

Christian Graus

5-Jun-05 15:42

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vclib/html/_mfc_CRichEditCtrl.asp[^]

The short version:

If you are using a rich edit control in a dialog box (regardless whether your application is SDI, MDI, or dialog-based), you must call AfxInitRichEdit once before the dialog box is displayed. A typical place to call this function is in your program's InitInstance member function. You do not need to call it for each time you display the dialog box, only the first time. You do not have to call AfxInitRichEdit if you are working with CRichEditView.

Christian Graus - Microsoft MVP - C++

Re: A question about CRichEditCtrl

fanlovefan5-Jun-05 17:12

fanlovefan

5-Jun-05 17:12

According to your hint,the question was solved!

The window would be showed after running program.

Thank you very much!

TCP service

prof.hell5-Jun-05 15:11

prof.hell

5-Jun-05 15:11

Guys,

Sorry if this is a FAQ

I am looing for exampe source code of a Windows service that can listen on a given port and efficiently communicate with (possibly) multiple client.

The APP should be developped under visual C++ version 6.0 and upwards, and would preferbly have a management aplette associated with it. Desktop interaction is a definate +

Youd help is much appreiated. My e-mail is worldentropy@yahoo.co.uk

Re: TCP service

ThatsAlok5-Jun-05 17:56

ThatsAlok

5-Jun-05 17:56

prof.hell wrote:
Youd help is much appreiated. My e-mail is worldentropy@yahoo.co.uk

As Mr. Archer Says
"I don't think you're going to get much help with an "email me for better understanding" post. This forum is not meant for people to do other's work. Rather we help people who are facing specific problems that they've defined during their development.

Do you have a specific question or are you looking for someone to basically write your application for you? "

Hope so you got my point

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta

help with toolbar with 256 color icons?

nm_1145-Jun-05 13:55

nm_114

5-Jun-05 13:55

I'm trying to create a toolbar with 256 color icons. I tried creating an ImageList and loading the images with LoadImage, but everything I tried either show the icon's transparant parts as black or white, or it changes the colors to what I'm guessing is Window's defualt 256 color palette. So, how do you go about creating a toolbar that show icons with transparency and with it's own palette?
- thanks.

ADO error 340

no_oop_please5-Jun-05 13:18

no_oop_please

5-Jun-05 13:18

I am trying to use ADO in C++ and am having problems. From several sources, including the help files, I have gotten this simple means of instantiating of a Connection object:

#import "C:\Program Files\Common Files\System\ado\msado15.dll" \
rename ( "EOF", "adoEOF" )

#include "DEBUG\msado15.tlh"
#include "DEBUG\msado15.tli"

/////////////////////////////////////////////////////////////////////
//
/////////////////////////////////////////////////////////////////////
BOOL ADODB_OpenDatabase(HWND hWnd)
{
ADODB::_ConnectionPtr conn;
HRESULT hr;
BOOL bRet = FALSE;
int err;

hr = CoInitialize(NULL);
if(FAILED(hr))
{ MessageBox(hWnd, "CoInitialize() failed", "OpenDatabase", MB_OK|MB_TOPMOST);
break;
}

// Create connection. (here is where I get the error 340)........
hr = conn.CreateInstance(__uuidof(ADODB::_Connection));
if(FAILED(hr))
{ err = HRESULT_CODE(hr);
ErrorMessage("Failed to create connection", "OpenDatabase", err);
goto FINISHED;
}

// Success.......................................................
bRet = TRUE;

// Cleanup.......................................................
FINISHED:
return bRet;
}

void ErrorMessage(TCHAR *szMsg, TCHAR *szCaption, int err)
{
LPVOID lpMsgBuf = 0;
TCHAR szErr[2001];
int nError;

if(err < 1)
nError = GetLastError();
else
nError = err;

if(!nError)
wsprintf(szErr, "%s. Error: %d", szMsg, nError);
else
{
FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
nError,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
(LPTSTR) &lpMsgBuf,
0,
NULL);
wsprintf(szErr, "%s. Error: %d. \r%s", szMsg, nError, (LPCTSTR)lpMsgBuf);
}

MessageBox(NULL, szErr, szCaption, MB_OK|MB_TOPMOST);

}

When I try to instantiate the connection object "conn" it get a bad HRESULT that is converted to Win32 error 340 which is not defined in the help files.

Any help would be greatly appreciated.
Rick C.

Thanks
Rick C.

Re: ADO error 340

no_oop_please5-Jun-05 13:31

no_oop_please

5-Jun-05 13:31

Sorry, I put this together too quickly. Here is a better (valid) ADODB_OpenDatabase function. (same problem)

BOOL ADODB_OpenDatabase(HWND hWnd)
{
ADODB::_ConnectionPtr conn;
HRESULT hr;
BOOL bRet = FALSE;
int err;

hr = CoInitialize(NULL);
if(FAILED(hr))
{ MessageBox(hWnd, "CoInitialize() failed", "OpenDatabase", MB_OK|MB_TOPMOST);
goto FINISHED;
}

// Create connection.............................................
hr = conn.CreateInstance(__uuidof(ADODB::_Connection));
if(FAILED(hr))
{ err = HRESULT_CODE(hr);
ErrorMessage("Failed to create connection", "OpenDatabase", err);
goto FINISHED;
}

// Success.......................................................
bRet = TRUE;

// Cleanup.......................................................
FINISHED:
CoUninitialize();
return bRet;
}

Thanks
Rick C.

Re: ADO error 340

no_oop_please6-Jun-05 5:49

no_oop_please

6-Jun-05 5:49

I figured it out. You must CreateInstance on 'Connection' not '_Connection' even though it does not show up in intellisense. I will post the new code to help anyone else who has this problem.

/////////////////////////////////////////////////////////////////////
//
/////////////////////////////////////////////////////////////////////
BOOL ADODB_OpenDatabase(HWND hWnd)
{
ADODB::_ConnectionPtr conn;
HRESULT hr;
BOOL bRet = FALSE;
int err;

hr = CoInitialize(NULL);
if(FAILED(hr))
{ MessageBox(hWnd, "CoInitialize() failed", "OpenDatabase", MB_OK|MB_TOPMOST);
goto FINISHED;
}

// Create connection.............................................
hr = conn.CreateInstance(__uuidof(ADODB::Connection));
if(FAILED(hr))
{ err = HRESULT_CODE(hr);
ErrorMessage("Failed to create connection", "OpenDatabase", err);
goto FINISHED;
}

// Success.......................................................
bRet = TRUE;

// Cleanup.......................................................
FINISHED:
conn = NULL;
CoUninitialize();
return bRet;
}

One more reason I don't like oop or com.

Thanks
Rick C.

JavaScript Suggestions?

bitpusher5-Jun-05 11:14

bitpusher

5-Jun-05 11:14

Hello,

I need to start working in Javascript for the first time.... it seems pretty straight forward. Right now, I have VC++ and Dreamweaver, should I get the J++ or is there another Java Script development environment that you suggest?

thanks!

JennyP

Spy++ / Window Handle

Abhishek Karnik5-Jun-05 10:41

Abhishek Karnik

5-Jun-05 10:41

I have used Spy++ to obtain the handle of a Window Panel and TreeView. I now want to use this handle to grab the tree. I don't understand how to do this ?? Any suggestions.
Once I grab the tree I want to be able to store this tree in a file.
Could someone please give me some direction here
Abhishek

Re: Spy++ / Window Handle

ThatsAlok5-Jun-05 18:12

ThatsAlok

5-Jun-05 18:12

Abhishek Karnik wrote:
now want to use this handle to grab the tree

Look at CTreeCtrl::Attach(...); and CTreeCtrl::Detach(...);

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta

reading and writing Files through MFC

Member 20005495-Jun-05 10:31

Member 2000549

5-Jun-05 10:31

if you please can u sent me some specific sites and examples not the MSDN or if so specifie to me wut should i write or where should i search .Because i am learning MFC newly and i have 1 week to hand in my project .
I need to know how can i read from a file or to a file in MFC classes and if u dont mind i would like to have an updating file example as well .
thank you in advance

Re: reading and writing Files through MFC

Jack Puppy5-Jun-05 11:09

Jack Puppy

5-Jun-05 11:09

CFile

Most of the member functions have examples, Open most likely has the most thorough example.

See CFile::modeNoTruncate flag for appending data to files.

Pssst. You see that little light on your monitor? That's actually a government installed spy camera. Smile and wave to big brother!

Re: reading and writing Files through MFC

Christian Graus5-Jun-05 11:22

Christian Graus

5-Jun-05 11:22

The best way is to use standard C++ most of the time. If you google ifsteam or ofstream, you're bound to find some references.

Christian Graus - Microsoft MVP - C++

Pass pointer to double array as func. parameter

Robert Palma Jr.5-Jun-05 7:28

Robert Palma Jr.

5-Jun-05 7:28

I'm having trouble figuring out how to pass a
pointer to a double array (1 dimensional)
to a C function.

Declaring array as: double xx[100];

Declaring func. int process( double *input[] )

Calling func. as one of the following:

process ( xx );
process ( &xx[0] );

I get various "can't convert, can't recast"
error messages from the compiler.

I have also tried declaring a double pointer and
pointing address of index zero of the array to the
double pointer - no luck either.

Using Visual Studio/Visual C 6.0

Many thanks,
Robert

Re: Pass pointer to double array as func. parameter

Tom Archer5-Jun-05 7:56

Tom Archer

5-Jun-05 7:56

int process(double *input)

double xx[100];
xx[0] = 1.1;
xx[1] = 2.2;
xx[2] = 3.3;
xx[3] = 4.4;
... 	
process(xx);

Re: Pass pointer to double array as func. parameter

Tom Archer5-Jun-05 8:01

Tom Archer

5-Jun-05 8:01

The following explains the problem you're facing and some solutions:
http://www.quepublishing.com/articles/article.asp?p=25281&rl=1[^]

Re: Pass pointer to double array as func. parameter

Dominik Reichl5-Jun-05 9:54

Dominik Reichl

5-Jun-05 9:54

Declaring array as: double xx[100];
Declaring func. int process( double *input[] )

The second one is a double pointer (pointer to an array). So, pass your array like:
process(&xx);

Best regards
Dominik

_outp(0x64, 0xAD);
and
__asm mov al, 0xAD __asm out 0x64, al
do the same... but what do they do??
(doesn't work on NT)

Re: Pass pointer to double array as func. parameter

Michael Dunn5-Jun-05 18:02

Michael Dunn

5-Jun-05 18:02

You can write either of these in the function:

int process ( double* input );
int process ( double input[] );

The two are equivalent, and the equivalence is an artifact of C's predecessor languages. Note that you also need a way to tell process() the size of the array, because the input parameter is just a pointer. The usual way is to add a second parameter of type size_t where you pass the number of elements in the array.

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

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