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Greetings. I am interested in thoughts and advice on parallel ports. I have equipment that is controlled thru the LPT1. Under DOS, I used the biosprint function, which is now defunct in C++.
I have tried using CreateFile and WriteFile in MFC, but have found Windows 98 to be very finicky about allowing the user to directly control the port - I can verify that the data has been sent to the port using CreateFile and WriteFile, but my equipment does not respond. Yet, I can go to the DOS prompt on the same machine and use the old functions and the equipment responds immediately. (But to fit in with the rest of the program, I have to do this in Windows 98)
Does anyone have suggestions or experience sending integer data to the LPT1 - or ideas about where I am going wrong?
Thanks in advance.
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Hi,
I want to draw MDI child outside MainFrame..
How can I implement this?
I searched all the MSDN and other sources just to fail..
Any suggestion will be appreciated..
Thanks in advance!!
Regardz
-Ryan
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Hi all,
I have a textbox (Microsoft Forms 2.0 ActiveX control). I want to do something after user press down arrow keys (VK_DOWN). when i used classwizard to add the event on the textbox, here is the function:
void CSubtitlerView::OnKeyDownMytextbox(LPDISPATCH KeyCode, short Shift)
{
// TODO: Add your control notification handler code here
}
I have no idea how to get the key information from KeyCode. Can anyone help me?
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Hello, I have a problem using my .exe on a computer other than mine. Everything works fine on my computer. When the user right clicks to get my popup menu an application error pops up which states "Memory could not be read". I've narrowed the problem down to the line of code where I call TrackPopupMenu. Here is the line:
menu.GetSubMenu(0)->TrackPopupMenu(TPM_LEFTALIGN | TPM_RIGHTBUTTON | TPM_RETURNCMD, point.x, point.y, this, NULL);
Do I need a dll? Can anyone help? Thank You
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Hi,
I want to write one small scree saver application.
what are the basic interfaces to built screen saver?
Give me sugestion how to proceed this one?
Thanks,
-- Koteswara rao
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Helloo..
I have to write an application that stay listening on the input line of a sound card (like Microphone) and when receive something starts to register it in a file on disk.
There are any ActiveX that already do this? If not, how can I access the status of the input line of a sound card?
Thanks to all You........
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Hello Norbert:
There are a couple of ActiveX controls that could do this.
Visual C++ comes with a registered multi-media control - you can get info on it by looking under your registered ActiveX controls and clicking on MS Communications Control.
If you need more flexibility and ActiveX controls that easily fit into dialog boxes, you might try TegoSoft. You can look over their ActiveX controls at www.tegosoft.com
If you are looking for some very simple classes that you can include in your project to set levels automatically, I can point you in some directions. Email me at:
<myles_k@email.com>
Regards,
Myles
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I'd like to send e-mails in HTML format with MAPI if possible. I'd appreciate any pointers on this/example code.
Thanks,
Mark.
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Hi All,
I am working on a telecom project.
I am facing CPU 100% problem.
Can any one tell me different reasons for a system CPU to reach 100%. I am reading a telephon number from a text file after that dialing the same number. After successfully done I am deleting the text file and updating the counter in DataBase (SQL). All these operations are done within a thread. The Application is a multithreaded application. I am not able to trace why the system CPU is reaching 100%.
OS is Windows NT.
Waiting for your suggestion(s).
Thanks in Advance.
Kumar.
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In multithreaded programming, you must be careful not to monopolize the CPU. The OS of course looks after scheduling, but it's up to you to let the OS know that you don't need every available timeslice for your loop.
A simple thing to do is to Sleep() your thread for a reasonable period of time between checks to see if it has work to do.
As a simple test, try putting Sleep(500) somewhere inside your loop and see what kind of effect it has on your CPU usage. You likely should architect a more elegant solution than a simple Sleep() call, one that better matches your program logic, but this should get you started.
You should also check out WaitForSingleObject() and its cohorts, it may make sense for your app.
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If the application is multithreaded, I would guess that one of the threads is spinning in a while loop, possibly waiting for something to happen. With a thread procedure like:
while(1)
{
WaitForSingleObject(..., 0) <- zero timeout
}
You can get 100% CPU utilization in a thread.
Changing the timeout to 1 millisecond will fix this.
Another possibility is that a thread in the database driver is using 100% of CPU time or something is polling and wating for the phone to connect. Hope this helps
Peter
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I try and create a thread that will loop the GetMessage,TranslateMessage,DispatchMessage commands,
but the thread only executes the loop once, and then exits. Someone told me you have to create a "GUI
thread" to do that. How to you make a GUI thread then?
--Dave
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As fas as I know,
GUI thead is a thread that has a message pump..
No more than that..
So check your callback procedure of the thread...
Make sure you do not break the loop of message pump..
It will be broken automatically by WM_QUIT..
After testing this, give me a THREAD to this posting..
Regardz
-Ryan
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Hello there,
I have created a treeview that reads the local drives using GetLogicalDrives() method....
However, I would like to make this treeview capable of reading UNC type of paths.
I have tried a few different things, but none of them seem to be working. I would appreciate your feedback.
thanks
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Hi,
Right now I am using GDI function CreateDC("DISPLAY", NULL, NULL, NULL) to capture the screen (desktop). However, it's too slow. I am
thinking there must be a way in DirectDraw to do this. I tried with IDirectDraw7::GetGDISurface(), but was not successful. To my best understanding, desktop surface exists in video memory somewhere but I don't know how to access it. Do you know if it's possible at all to capture this surface with DirectDraw, particularly with
IDirectDraw7::CreateSurface()?
Thank you very much for your time!
kk9
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Hi,
I got a printing class and each time when a page finish printing the printer alway advances automatically to the next page.
I love to find some command to stop this advance (just for special purpose)
I am using
//my code here
CDC *ptrdc;
......
ptrdc->StartDoc (&doc);
ptrdc->StartPage();
.......
ptrdc->EndPage(); // I thougt this command will stop!!
ptrdc->EndDoc();
.......
Thank you,
Brian
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Is there anyway to tell Visual C++ IDE to automatically use Macro assembler to compile assembly language files instead of using a custom build every time a assembly file is included in a project?
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Hi,
Does any body have experience with writing a program that runs multiple jobs scheduled at different time? I would like to get some ideas of writing an efficient scheduler type of service. My first approach is to set up the schedule in a database table. A main thread will loop through the table and create new thread for the job that is due to run. Once the job is done, the thread will be terminated. My main concern is that if the table gets too big with a lot of jobs, the jobs would not get processed at the right time. Can somebody verify this design and share some of his expertise on this type of program? Thanks.
Wilson
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How can I acces to voriables of other program?
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The easiest way, assuming you're writing both, is to use SendMessage to pass the variables as a string between them.
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How can I acces to voriables of other program?
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How do one programmatically set the various user privileges such as - SeTcbPrivilege, SeChangeNotifyPrivilege etc.?
Is the API for this provided in:
"Windows Management Instrumentation" (WMI) ??
Many thanks to all those who respond.
Sai
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Hi all,
If anybody has used a, "MS Tabbed Dialog Ctrl 6" in their VC++ 6.0 projects, pl. let me know the procedure to doit!
Im not able to add the tab pages in design time (or runtime). Though I get the wrapper class, there are no methods in it to add page.
thanks in advance..
please reply in mail to prabhahar@flashmail.com
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Hi Buddy,
During design time of the control, you will have to change the "TabsPerRow" property to the desired no of tabs per row and then change the no of tabs (ie tab count) property.
Though i didnt go through the class wrapper, i guess the above procedure has to be followed in runtime also.
Happy coding. 
Cheers
KayKay
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