Re: Run MFC Program Without Dialog Showing - C / C++ / MFC Discussion Boards

Re: Run MFC Program Without Dialog Showing

Andraw11110-Sep-13 8:20

10-Sep-13 8:20

Alan,

Thank you for yoru reply.

In PreCreateWindow(CREATESTRUCT& cs)

I set:

cs.cy = 0.0;
cs.cx = 0.0;
cs.y = 0;
cs.x = 0;

return CFormView::PreCreateWindow(cs);

But there still have flush of the dialog.

Re: Run MFC Program Without Dialog Showing

Alan Balkany10-Sep-13 8:23

Alan Balkany

10-Sep-13 8:23

Hmm... Maybe you could try: ShowWindow(SW_MINIMIZE);

Re: Run MFC Program Without Dialog Showing

Andraw11110-Sep-13 11:11

Andraw111

10-Sep-13 11:11

I try it, but you can see the process that the dialog is minimized, that's not what I expected.
Thanks!

Re: Run MFC Program Without Dialog Showing

Alan Balkany10-Sep-13 11:39

Alan Balkany

10-Sep-13 11:39

Another idea: Use this: http://msdn.microsoft.com/en-us/library/kc4ez6dk%28v=vs.90%29.aspx[^]

to lock the window while you bring up the dialog, with the window hidden. LockWindowUpdate may prevent the flash while the dialog is displayed then hidden.

Re: Run MFC Program Without Dialog Showing

Richard MacCutchan10-Sep-13 10:42

Richard MacCutchan

10-Sep-13 10:42

Take the calculation code and move it to a separate source file so you can add it to different projects.

Veni, vidi, abiit domum

Re: Run MFC Program Without Dialog Showing

Andraw11110-Sep-13 11:13

Andraw111

10-Sep-13 11:13

Richard,

Thanks for reply. the existing program is used by several projects, soome want the dialog, some not. so I just want to pass a argument to indicate show dialog or not.

Re: Run MFC Program Without Dialog Showing

Richard MacCutchan10-Sep-13 11:31

Richard MacCutchan

10-Sep-13 11:31

OK, so accept a parameter and if it's false do not show the dialog, something like:

C++

int APIENTRY WinMain(HINSTANCE hInstance,       // instance value of the invoked application
                     HINSTANCE hPrevInstance,   // no longer used
                     PSTR      pszCmdLine,      // pointer to the MS-DOS command line
                     int       nCmdShow         // value indicating initial state of the window
                     )
{
    BOOL myParameter;
    // get the parameter from the command line and convert to BOOL

    if (myParameter == TRUE)
    {
        DialogBoxParam(hInstance,
                       MAKEINTRESOURCE(IDD_DLG),
                       NULL,
                       (DLGPROC)DlgProc,
                       NULL
                       );
    }
    else
    {
        // call the function to calculate and write the file
    }

    return TRUE;
}

Where is the problem?

Veni, vidi, abiit domum

Re: Run MFC Program Without Dialog Showing

digitalspace.xjtu10-Sep-13 22:50

digitalspace.xjtu

10-Sep-13 22:50

Following Richard's idea , if you program based on MFC Dialog , I think you can change InitialInstance() like this

...........

C++

BOOL myParameter;
CMFCApplication4Dlg *pMainWnd = new CMFCApplication4Dlg;

if(myParameter)  // need a dialog
{
      pMainWnd->DoModal();
}else {    // needn't a dialog
pMainWnd->CreateEx(NULL,_T("STATIC"), L"Hi", WS_BORDER ,   //WS_VISIBLE is not need
          CRect(-15, -15, -15, -15), NULL,NULL);

     // start a thread which include while loop,
     // that can keep dialog running until you stop it by yourself
     // otherwise the programe will exit very quickly
}

........

Re: Run MFC Program Without Dialog Showing

Freak3010-Sep-13 23:21

Freak30

10-Sep-13 23:21

I wouldn't create the main window at all if no Dialog/MainFrame is needed. Just call the class doing the processing from InitInstance(), if no window is requested. The program will end automatically when the processing is complete.

In case of the windowed mode you can start the same processing from a button click or menu item click.

The good thing about pessimism is, that you are always either right or pleasently surprised.

Re: Run MFC Program Without Dialog Showing

Andraw11111-Sep-13 3:35

Andraw111

11-Sep-13 3:35

Hi, dear all,

I solve this issue, thanks for all of you for your help.

inside InitInstance() function

m_nCmdShow = SW_HIDE;
CCommandLineInfo cmdInfo;
ParseCommandLine(cmdInfo);
.........
.......
.......
m_pMainWnd->ShowWindow(m_nCmdShow);
m_pMainWnd->UpdateWindow();
return FALSE;

Re: Run MFC Program Without Dialog Showing

digitalspace.xjtu11-Sep-13 23:41

digitalspace.xjtu

11-Sep-13 23:41

It seems no different compared with your original version. why it works？

Re: Run MFC Program Without Dialog Showing

David Crow11-Sep-13 10:36

David Crow

11-Sep-13 10:36

Andraw111 wrote:

Now I have another program which only want to use the calculation result stored in file

Then why are you creating such overhead by making it an MFC app? Why not just create a console app with a hidden window? My guess would be 10-15 lines of code within main().

"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

Modbus Protocol

Member 99906089-Sep-13 19:17

Member 9990608

9-Sep-13 19:17

Hi,

I am a newbie in regard to modbus protocol.
I would like to make a communication between two MFC dialog application in VC++ using Modbus protocol.
Can somebody help me with a sample code of this .

I had been browsing for this for the past 4 days and I am lost..

Re: Modbus Protocol

Richard MacCutchan9-Sep-13 21:03

Richard MacCutchan

9-Sep-13 21:03

Member 9990608 wrote:
Can somebody help me with a sample code of this .

Most unlikely, you are expected to write your own. You probably need to spend some time looking through some of these links[^] to gain a good understanding of the protocol.

Veni, vidi, abiit domum

Re: Modbus Protocol

CPallini9-Sep-13 22:15

CPallini

9-Sep-13 22:15

MODBUS is actually a simple protocol, it shouldn't be too difficult for you to deal with it.
Two of the documents linked by Richard were enough for me, namely:

Modicon Modbus Protocol Reference Guide[^] where you may find reference documentations and, above all, the source code of the MODBUS CRC16 algorithm (see Appendix C at the very end of the document).

and

MODBUS APPLICATION PROTOCOL SPECIFICATION V1.1b[^] where you may find a somewhat cleaner explanation of the MODBUS functions.

Veni, vidi, vici.

is c++ outdated, why is there no refference to it in windows virtual academy ?

A.U.K9-Sep-13 0:03

A.U.K

9-Sep-13 0:03

can we make websites with c++ or do we really need knowledge regarding javascrpt and HTML5 ?
can we make apps in windows store with c++ or do we really need knowledge regarding c# and HTML5 ?
can we make apps in istore with c++ or do we need knowledge regarding cocoa programming ?
in iTunes-U, windows virtual academy, and many other online courses do not provide training in the feild of c++ ? why ?
is it sooo outdated and useless ?
why is it being devalued ?
is it still " all powerfull " or " just another programming launguage " ?

Re: is c++ outdated, why is there no refference to it in windows virtual academy ?

NotPolitcallyCorrect9-Sep-13 1:47

NotPolitcallyCorrect

9-Sep-13 1:47

Please do not cross post. You have already posted this in QA, here[^]

Using CDHtmlDialog app, changing images (JPG,PNG) dynamically in the HTML Page

Don Guy6-Sep-13 12:37

Don Guy

6-Sep-13 12:37

Hello all,

I created a MFC dialog using CDHtmlDialog and added a HTML page with many controls and one of them is a IMAGE tag. I got a default image loaded from the hard drive displayed in the HTML page. Up to this part, everything works fine.

Now what i want to do is, dynamically change the image based on the user click on one of the HTML buttons. I don't want this image source to be hard coded in the HTML nor the image source send from the MFC app.

What i want is for the MFC app to send the image data to the HTML in some (binary) format and then the page to display the image.

The possible option i was thinking of was to read the image file which is already in my hard drive as a binary file and send the binary data across to the HTML as a memory buffer, and then use JavaScript to decrypt this binary data and display the image.

I am not even sure whether this is possible. So basically what i want is for the HTML page to display a image from the memory.

Can anyone guide me on how to do this? What approach needs to be taken?

Thanks in advance.

Re: Using CDHtmlDialog app, changing images (JPG,PNG) dynamically in the HTML Page

Richard MacCutchan7-Sep-13 1:39

Richard MacCutchan

7-Sep-13 1:39

This is the same issue as all your other questions in this forum. Perhaps you should try some of the suggestions you have already been given.

Veni, vidi, abiit domum

Re: Using CDHtmlDialog app, changing images (JPG,PNG) dynamically in the HTML Page

Richard Andrew x647-Sep-13 11:29

Richard Andrew x64

7-Sep-13 11:29

Don Guy wrote:
What approach needs to be taken?

What you're supposed to do is respond to the button click by generating new HTML on the fly, and telling the HtmlDialog to load it. I don't recall the exact function names, but you'll find it all in the documentation.

The difficult we do right away...
...the impossible takes slightly longer.

Re: Using CDHtmlDialog app, changing images (JPG,PNG) dynamically in the HTML Page

Don Guy8-Sep-13 9:31

Don Guy

8-Sep-13 9:31

To make the question much more simpler Smile | :)

1. Can i pass the Image file (JPG, PNG) as a memory buffer like "unsigned char *" from my MFC app to the HTML page and then use some JavaScript function to understand that it's a Image file and display on the HTML page. It can be done either by passing the JPG to the "src" of Image or drawing it on a CANVAS. But all JS/HTML should have is a memory buffer of Image file.

So the 1st question is,

1. How to read a Image file as memory buffer (unsigned char *) in MFC? i.e, making sure it doesn't loose any NULL terminators or any binary contents.

And 2nd question is,

1. How to pass this memory buffer to the JavaScript function in the HTML page?

And 3rd question is,

1. How can the JavaScript function decrypt this memory buffer into a Image file and display in the HTML page?

The reason why i want to do it this way is because the HTML should never be able to display the Image file from a file path or URL. That is a requirement for the project i am doing.

HTML page should only use a memory buffer containing the Image file info. Hope this information helps.

Thanks in advance. I appreciate the 2 earlier responses i got.

Re: Using CDHtmlDialog app, changing images (JPG,PNG) dynamically in the HTML Page

Richard Andrew x648-Sep-13 14:12

Richard Andrew x64

8-Sep-13 14:12

If you want/need to do it that way, then why use the html dialog at all? Why not just make a regular dialog box that shows the graphic, and you can pass the memory buffer to it.

As far as I know, there is no way to do it the way you are describing.

The difficult we do right away...
...the impossible takes slightly longer.

Re: Using CDHtmlDialog app, changing images (JPG,PNG) dynamically in the HTML Page

SoMad8-Sep-13 15:38

SoMad

8-Sep-13 15:38

I am going to assume you will follow what Richard said and reload the HTML in the dialog. I am also going to assume that you are able to modify the HTML from within your code.
In this case, you should be able to achieve what you want by embedding the image as Base64 encoded data, but note that this process increases the size of your data. This is also know as The Data URI Scheme:
http://en.wikipedia.org/wiki/Data_URI_scheme[^]

Here is a CodeProject Tip on the subject: Embedded HTML Help File with Images[^]

Be careful not to overdo it. Notice how slow this article loads because the resulting HTML document is 6.7 MB large: Walks Of Life[^]

Soren Madsen

"When you don't know what you're doing it's best to do it quickly" - Jase #DuckDynasty

Reading Image (JPG) file as Binary to CString

Don Guy6-Sep-13 6:03

Don Guy

6-Sep-13 6:03

Hello there,

I am writing an MFC app in Visual Studio 2012 that will open a JPG file as binary and read all the contents to a CString.

I am able to read it to a std::Vector, but that doesn't help me much as i need to pass all the binary content as a MFC CString to another function.

Can anyone help me with a sample code for that?

Thanks in advance

Re: Reading Image (JPG) file as Binary to CString

jeron16-Sep-13 6:09

jeron1

6-Sep-13 6:09

Don Guy wrote:
binary content

Don Guy wrote:
MFC CString

These terms generally don't mix, something sounds wrong. a CString is not a good way to pass binary data.

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