Re: MFC help : code error 0000007B - C / C++ / MFC Discussion Boards

jawadali47714-May-12 23:42

14-May-12 23:42

basically i have the console program running fine (means having source file and header files). than i wanted to build GUI for this using MFC in vs2008. now i don't understand how to open serial port in MFC. code below shows how to open serial port in console programming using cmd prompt.

COMportName[0] = ' ';
     while (COMportName[0] == ' ') {
         printf("\nEnter the %s port number the PTU is attached to: ", COMportPrefix);
         scanf("%d", &COMportNum);
         printf("You selected %s%d. Is this OK? (enter 'y' or 'n'): ", COMportPrefix, COMportNum);
         tmpChar = 'f';
         while ( (tmpChar != 'y') && (tmpChar != 'n') )
               tmpChar = ((char) tolower(getchar()));
         if ( tmpChar == 'y' )
            sprintf(COMportName, "%s%d", COMportPrefix, COMportNum);
     }
     tmpChar = 'f';
     while (tmpChar != 'y') {
         printf("\nEnter the baud rate the ptu is communicate at (default: 9600): ");
         scanf("%d", &BaudRate);
         printf("You selected %d. Is this OK? (enter 'y' or 'n'): ", BaudRate);
         tmpChar = 'f';
         while ( (tmpChar != 'y') && (tmpChar != 'n') )
               tmpChar = ((char) tolower(getchar()));
     }


     /* initialize the serial port */
     set_baud_rate(BaudRate);
     COMstream = open_host_port(COMportName);

     if ( COMstream == PORT_NOT_OPENED )
         { printf("\nSerial Port setup error.\n");
           goto abnormal_exit;  }
     printf("\nSerial port %s initialized\n", COMportName);

Re: MFC help : code error 0000007B

CPallini14-May-12 23:52

CPallini

14-May-12 23:52

jawadali477 wrote:
COMstream = open_host_port(COMportName);

I would use the debugger to watch COMportName content in both console and MFC applications.

Veni, vidi, vici.

Re: MFC help : code error 0000007B

jawadali47716-May-12 19:14

jawadali477

16-May-12 19:14

console program is running fine. problem is in MFC program. can you tell how to implement the console program, as mentioned, in MFC??

Re: MFC help : code error 0000007B

TinyDevices15-May-12 3:32

TinyDevices

15-May-12 3:32

What a mix up of different naming conventions!

Re: MFC help : code error 0000007B

Andy41114-May-12 22:49

Andy411

14-May-12 22:49

As CPallini pointed out

CPallini wrote:
The error message is (you can check it in WinError.h)
//  The filename, directory name, or volume label syntax is incorrect.

Are you sure COM3 exists on your machine?
Did you try the format \\.\COM3 instead?

What happens in set_baud_rate() and in open_host_port()? You have to open the COM-Port before changing the baudrate

Cou can find some more hints on serial communication here:
Communications Resources[^]

[Edit]corrected spelling of memeber name Blush | :O

[/Edit]

modified 15-May-12 5:16am.

Re: MFC help : code error 0000007B

CPallini14-May-12 23:09

CPallini

14-May-12 23:09

Andy411 wrote:
JPalini

Veni, vidi, vici.

Re: MFC help : code error 0000007B

Andy41114-May-12 23:18

Andy411

14-May-12 23:18

Oooouuuuuuch
Sorry, I just corrected it. Sometimes I don't have any control on what my fingers are doing with the keyboard Rose | [Rose]

Re: MFC help : code error 0000007B

jawadali47714-May-12 23:46

jawadali477

14-May-12 23:46

yes COM3 is available and i have tried \\.COM3 and \\\\.\\COM3 both. basically i'm developing GUI via MFC in vs2008 for my console program. part of the code for opening serial port in console program is given below. i can't understand how to do it in MFC.

COMportName[0] = ' ';
     while (COMportName[0] == ' ') {
         printf("\nEnter the %s port number the PTU is attached to: ", COMportPrefix);
         scanf("%d", &COMportNum);
         printf("You selected %s%d. Is this OK? (enter 'y' or 'n'): ", COMportPrefix, COMportNum);
         tmpChar = 'f';
         while ( (tmpChar != 'y') && (tmpChar != 'n') )
               tmpChar = ((char) tolower(getchar()));
         if ( tmpChar == 'y' )
            sprintf(COMportName, "%s%d", COMportPrefix, COMportNum);
     }
     tmpChar = 'f';
     while (tmpChar != 'y') {
         printf("\nEnter the baud rate the ptu is communicate at (default: 9600): ");
         scanf("%d", &BaudRate);
         printf("You selected %d. Is this OK? (enter 'y' or 'n'): ", BaudRate);
         tmpChar = 'f';
         while ( (tmpChar != 'y') && (tmpChar != 'n') )
               tmpChar = ((char) tolower(getchar()));
     }


     /* initialize the serial port */
     set_baud_rate(BaudRate);
     COMstream = open_host_port(COMportName);

     if ( COMstream == PORT_NOT_OPENED )
         { printf("\nSerial Port setup error.\n");
           goto abnormal_exit;  }
     printf("\nSerial port %s initialized\n", COMportName);

Re: MFC help : code error 0000007B

Andy41114-May-12 23:59

Andy411

14-May-12 23:59

Does the console programm run?
And what's the code inside open_host_port()?
Did you step through the code of open_host_port() in the debugger? Examine every return code of Win32 API-calls and check GetLastError().

What happens, if you just do a call to the CreateFile-function to open the COM-port, just like in this article

Creating a Serial communication on Win32[^]

I dont't think that this is an MFC problem,

Re: MFC help : code error 0000007B

David Crow15-May-12 3:52

David Crow

15-May-12 3:52

Andy411 wrote:
I dont't think that this is an MFC problem,

I agree.

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Re: MFC help : code error 0000007B

David Crow15-May-12 3:58

David Crow

15-May-12 3:58

jawadali477 wrote:
char COMportPrefix[10] = "COM";
char COMportName[256];

sprintf(COMportName, "%s%d", COMportPrefix, COMportNum); // initialize serial port COM3

strng = CString(COMportName);
strng.Format(_T("%0.9s"), strng);
SetDlgItemText(IDC_STAT, strng);

I'm thinking you could eliminate some overhead here. Try:

strng.Format(_T("COM%d"), COMportNum);

Note that this likely has nothing to do with why open_host_port() is not opening the port.

Re: MFC help : code error 0000007B

soaringpilot15-May-12 10:44

soaringpilot

15-May-12 10:44

I do not recognize the open_host_port function, but it does not really matter. On some systems you need to add a ':' after COMx. Try sprintf(COMportName, "%s%d:", COMportPrefix, COMportNum); to get COM3:

Cheers,
Henryk

Re: MFC help : code error 0000007B

jawadali47716-May-12 19:19

jawadali477

16-May-12 19:19

i did what you suggested and now the error comes out to be 00000002 (i.e The system cannot find the file specified). and the outcome of

SetDlgItemText(IDC_STAT, strng);

is "COM3:".

Re: MFC help : code error 0000007B

soaringpilot17-May-12 6:19

soaringpilot

17-May-12 6:19

OK, so this means you fixed one problem (I think), but now came up against another. I believe 7B meant that command format was wrong that is why I was suggesting the ':' the 2 means that system cannot find COM3. Are you sure that it exists. On a Windows PC you'd look in device manager. If it really exists then 7B probably means something else.
That is about all I can help.

Henryk

Responding To Asynchronous Functions

AmbiguousName14-May-12 20:38

AmbiguousName

14-May-12 20:38

hello guys... how do I respond to an asynchronous function call? Let's say that I have a function (asynchronous, boolean) like this

classObject->Function_Call();

Now I want to do something like this

BOOL bResult = FALSE;
bResult = classObject->Function_Call();
if(bResult)
{
   // do something
}
else
   // do something else

Now what do I do in this situation as Function_Call() is asynchronous? Thanks for any input.

This world is going to explode due to international politics, SOON.

Re: Responding To Asynchronous Functions

CPallini14-May-12 22:08

CPallini

14-May-12 22:08

The short answer is: you cannot do that.
When the function is asynchronous you may usually perform a test like that only to know whether the function was called properly (it might fail, for instance, if classObject was not properly initialized). To know the result of the actual function execution you should check that a state change happened, but that is specific of the function (for instance asynchrounous I/O Windows API provide GetOverallappedResult function) and there is no general way.

Veni, vidi, vici.

Re: Responding To Asynchronous Functions

TinyDevices15-May-12 3:31

TinyDevices

15-May-12 3:31

Let me address this in simpler terms without any context to the OS.
When you say "Async" , the control passes through. In your example, there is no point in waiting to check "bResult". Typically an Async function is attached with a callback function - a function pointer to notify when the operation has been completed.

Or you'll attach a Windows Handle (windows) so that the Async function can post updates to the function through messages.

So you need to figure out how your function_call() is implemented to let the main thread (for example- main()) know the completion of the function.

Re: Responding To Asynchronous Functions

soaringpilot15-May-12 10:51

soaringpilot

15-May-12 10:51

Sounds like you need a multithreaded application. With one thread set up to wait for the call while another is doing the normal processing. On the other hand it kind of depends on what you mean by asynchronous. Windows message pump is is another example of managing asynchronous events.

Cheers,
Henryk

Re: Responding To Asynchronous Functions

TomasRiker217-May-12 8:12

TomasRiker2

17-May-12 8:12

Then you have to wait until you get the result and then decide how to continue.

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How do I check or change text in a VS2008 menu bar menu item

soaringpilot14-May-12 12:22

soaringpilot

14-May-12 12:22

I must be doing something really stupid, but... I cannot get any of the changes to my menu items reflected in visual appearance. If I check a menu item, or change string I can see changes if I test in code, but not when I click on the menu bar.

I use standard default bar creation in main frame OnCreate:

C++

CMFCVisualManager::SetDefaultManager(RUNTIME_CLASS(CMFCVisualManagerWindows));
if (!m_wndMenuBar.Create(this))
{
    TRACE0("Failed to create menubar\n");
    return -1;      // fail to create
}
m_wndMenuBar.SetPaneStyle(m_wndMenuBar.GetPaneStyle() | CBRS_SIZE_DYNAMIC | CBRS_TOOLTIPS | CBRS_FLYBY);

I then create a menu message handler in a view and in it I put something like this:

C++

MENUITEMINFO info;
TCHAR buf[32];

info.cbSize=sizeof(MENUITEMINFO);
info.fMask=MIIM_STATE|MIIM_ID|MIIM_STRING;
info.fType=MFT_STRING;
info.dwTypeData=0;

HMENU hMenusafe= ((CMainFrame*)(AfxGetApp()->m_pMainWnd))->m_wndMenuBar.GetHMenu();
HMENU hMenu=::GetSubMenu(hMenusafe,0);
DWORD err=GetLastError();
int er=GetMenuItemInfo(hMenu,3,1,&info);
 err=GetLastError();
 info.cch++;
 if( info.cch > 32)
      info.cch = 32;
 info.dwTypeData=buf;
 er=GetMenuItemInfo(hMenu,3,1,&info);
 err=GetLastError();

if(info.fState & MFS_CHECKED)
{
    info.fState &=~MFS_CHECKED;
    info.fState|=MFS_UNCHECKED;
    _tcscpy(buf,_T("Menu is unchecked"));
    info.cch=_tcslen(buf)+1;
}
else
{
    info.fState &=~MFS_UNCHECKED;
    info.fState  |=MFS_CHECKED;
    _tcscpy(buf,_T("Menu is checked"));
    info.cch=_tcslen(buf)+1;
}

er=SetMenuItemInfo(hMenu,3,1,&info);
((CMainFrame*)(AfxGetApp()->m_pMainWnd))->DrawMenuBar();

As I click on the menu item I never see a check, nor changed text. However as I am stepping through the code debugging, I see that changes did take place. What am I doing wrong?

Any help appreciated
Henryk

Re: How do I check or change text in a VS2008 menu bar menu item

«_Superman_»14-May-12 16:32

«_Superman_»

14-May-12 16:32

You need to create a handler for ON_UPDATE_COMMAND_UI.
The handler will have a CCmdUI class pointer as its parameter using which you can check the menu item.
Here is an article that does this - Using ON_UPDATE_COMMAND_UI with menu items and controls[^]

«_Superman_»
I love work. It gives me something to do between weekends.

Microsoft MVP (Visual C++)

Polymorphism in C

Re: How do I check or change text in a VS2008 menu bar menu item

soaringpilot15-May-12 10:21

soaringpilot

15-May-12 10:21

Thanks! that works. I guess it is another disconnect in MFC Frown | :(

c++ win32, What's the best way to handle large fonts 120 dpi

jkirkerx14-May-12 8:33

jkirkerx

14-May-12 8:33

I can detect the 120 mode, now I to decide how to handle large fonts

Should I use the paint, and resize all the controls?

Re: c++ win32, What's the best way to handle large fonts 120 dpi

enhzflep14-May-12 11:06

enhzflep

14-May-12 11:06

I recall reading an article once that discussed the difference between using a Frame and using a Dialog, with particular reference to the effect it had on automatically scaling the controls and parent window itself. Unfortunately, I just haven't been able to find it over the past couple of hours.

I did find a pair of article @ MS that discuss scaling, hope they'll be of some help.

How to Write High-DPI Applications[^]
INFO: Calculating The Logical Height and Point Size of a Font[^]

Re: c++ win32, What's the best way to handle large fonts 120 dpi

jkirkerx14-May-12 11:38

jkirkerx

14-May-12 11:38

Thanks for looking for that article.

I'll start small, and fix the artwork bitmaps first. Then work on control sizes next.

I was doing final testing, and decided to check out large fonts, and found that I'm not done yet.

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