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 What's the problem ? If you can do it for one port, just "reuse" the same code. E.g. the best is to put all the code in one specific class (you can find some of them on codeproject). Then you just reuse the class twice: one for port 1 and one for port 2.
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Thaks for the reply.
If i want to communciate with 10 ports, then i need to create 10 threads??
I want to communcate parallely.
All of them have only one receive function?
Regards,
Sunil Kumar
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sunilkumar.d wrote: If i want to communciate with 10 ports, then i need to create 10 threads??
Depends on how you are reading the data but it makes sense yes. Alternatively you could also use overlapped IO but it is a bit more complicated to do. In overlapped IO, you have an event for each port that gets notified when data comes in. Then you could wait for 10 events at the same time in one thread.
But both solutions are fine and it depends also what you need to achieve...
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sunilkumar.d wrote: If i want to communciate with 10 ports, then i need to create 10 threads??
depends on your protocol... RS485 allows multiple drop points, you have only one port to read each drop point is addressed.
RS232 you would need a way to read each port seperately so 10 threads might be the answer.
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how to handle Vertical scrollbar in a dialog bar.
If Suppose i am having a 30 Buttons in a dialog Bar which is align vertically and Display of 30 buttons are crossing the height of the screen.Then how to display them with the help of Vertical scroll button
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There is quite a lot of resource on that subject, just search a bit (on CP or google). Here[^] is an example of a helper class for instance.
And here[^] is a tutorial on the MSDN website.
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error C2248: 'query' : cannot access protected member declared in class ' DerivedDialog'
Pls advice
.H
class DerivedDialog : public BaseDialog
{
// Construction
public:
//controlling function header
static UINT OnSearchButton(LPVOID param); // Thread function
typedef struct THREADSTRUCT //structure for passing to the controlling function
{
CDemoDlg* _this;
} THREADSTRUCT;;
....
}
.CPP
call:
THREADSTRUCT *_param = new THREADSTRUCT;
thSerOper=AfxBeginThread(OnSearchButton,_param);
UINT AssetSearchDialog::OnSearchButton (LPVOID param)
{
THREADSTRUCT* ts = (THREADSTRUCT*)param;
ts->_this->query().updateRowCount(maxRowCount());
....
}
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First question: why do you package the this pointer in a THREADSTRUCT structure if you only need to pass the pointer ? Just pass the this pointer, this will make things a bit more readable.
I guess query is a protected member function of DerivedDialog ? Your names are not consistent: you replaced some of them so we can't understand everything.
Anyway the error message should be clear enough: you are trying to access a protected method from one class from another class, which is not allowed. Make the function public if you need to access it from another class.
And please read the poisting guidelines before posting: format the code properly so that it is more readable. It's been a while that you are on this forum...
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Thanks for you responce. I am sorry for the inconvience cassued. Actuall there was a very timming consumming corba call on a button event which frezes the application. I just want to displaly a popup never ending Progress Dlg during this time. Pls advice
Dlg::ButtonEvent()
{
//Thread Displaying never ending Progress Dlg
//Very timming consuing CORBA CALL
//End the Thread displaying never ending Progress Dlg
}
As ther are lot many such call, i dont want to put the timming consumming calls in a thread, and Insted looking for some generic implementation for the progress bar
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You've shown everything but the declaration of CDemoDlg.
"Love people and use things, not love things and use people." - Unknown
"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne
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please Give me a link for c++ & vc++ faq
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I give you links to Google [^], [^].
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke
[My articles]
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Sorry, I'm all out. The next batch is scheduled to arrive next Thursday. 
"Love people and use things, not love things and use people." - Unknown
"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne
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Hi all,
I am using MessageBox to display a message with following parameters
MessageBox("Created Successfully",_T("test2"),MB_OK|MB_SYSTEMMODAL|MB_ICONINFORMATION);
now my problem is that my message box is displaying a system default icon on messagebox taskbar....now what i want is either to remove that icon or it should take application default icon.....
How is this possible????
Thanks in advance
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Why are you using the MB_SYSTEMMODAL flag ?
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actually i want to have always on top property for my message box......
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Always on top ? Over all other windows ? That's a bit intrusive if the message is not vital (and by the text you showed in the example, it is not vital at all). If an application that I use would have such intrusive behavior, I would uninstall it immediately.
Anyway, I think the icon is coming because you are using this flag. In the doc they say:
Use system-modal message boxes to notify the user of serious, potentially damaging errors that require immediate attention (for example, running out of memory).
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When i run the following command in console at non-admin account
runas.exe /u:Administrator cmd.exe"
Note: It will prompt to ask admin password :
if we enter admin pwd the console says it will run at admin account(at titlebar)
In that console ,i have typed boot.ini and press enter.
The boot.ini file is opened in notebad.If i edit that it will saved.
can i achieve this via VC++.
I need to get pwd in dialog and pass to console (for Note:)
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pooja_friends wrote: can i achieve this via VC++.
Yes
SHELLEXECUTEINFO shExecInfo;
shExecInfo.cbSize = sizeof(SHELLEXECUTEINFO);
shExecInfo.fMask = NULL;
shExecInfo.hwnd = NULL;
shExecInfo.lpVerb = _T("runas");
shExecInfo.lpFile = _T("notepad.exe");
shExecInfo.lpParameters = _T("c:\\boot.ini");
shExecInfo.lpDirectory = NULL;
shExecInfo.nShow = SW_MAXIMIZE;
shExecInfo.hInstApp = NULL;
ShellExecuteEx(&shExecInfo)
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Thanks its working
If run the above code,it asks "which user account do you want to run this program"
I need to set administrator as default without asking user.Get password from user and login to edit boot.ini from command line.
how i do that.
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Prompt for the password yourself in your application, and use CreateProcessWithLogonW.
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can u give me sample code for CreateProcessWithLogonW please
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It's fully documented in MSDN.
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Hi,
I am trying to write to a 24 col printer which has a centronics connector i.e., parallel printer connector and if I write to the LPT1 using following code it works fine.
hLPT = CreateFile("LPT1",GENERIC_WRITE, 0,
0, CREATE_ALWAYS, FILE_FLAG_NO_BUFFERING, 0);
if(hLPT == INVALID_HANDLE_VALUE)
{
AfxMessageBox("Cannot open port");
return 0 ;
}
WriteFile(hLPT,str,size,&lLen,NULL);
ch = 0x0F;
WriteFile(hLPT,&ch,1,&lLen,NULL);
CloseHandle(hLPT);
But as I am using USB to Parallel convertor I have used "USB001" in place of LPT1 But it is not printing. Is there any solution for this.
Thankx
Murali. S
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