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Thanks for your useful reply. I had another question for you, not realting to this post, how can I start a process (to say an exe) within another cpp project and terminate it whenever I want to. I am looking at CreateProcess(but seems this function waits till the called program exits for the calling program to gain control). I need to call an exe file independently of the calling program.
Ex: program1 calls exe file of program2, program2 executes on itself and keeps running untill program1 terminates program2 instance.
Any suggestions on easy implementation of this??
thanks,
-Pavan
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use ShellExecute(this->m_hWnd,"open","your EXE File Name","","",SW_SHOW );
ur exe must be within ur Project Folder
Aavesh
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Thanks, I thought of using this too, but How can I terminate the process that is created??( I would like to stop this process wherever/whenever I want)
thanks,
-Pav
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hi
u must tell me which type of exe u r calling
explain little more ur question
Aavesh
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Ok here ya go, the exe file I want to execute is another executable generated from another cpp program. Basically my program generates a waveform depending on the clock that we input to that board. The clock is generated by a NI board and this is written in another cpp file. So, in my actual waveform generation code I want to control the clock generation from NI board at my will. Hope I am clear.
thanks,
-Pav.
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This has probably been solved a million times before, but I can't find anything. I have an Import option that allows the user to convert data from one format to another, which can be time-consuming. Therefore, I would like to have a dialog box with a progress bar.
My first approach was to create a modeless dialog and update the file list and progress bar as I go. But my problem is the dialog never finishes displaying before processing begins, so I can't use the Cancel button. I'll assume its because I'm in a loop and never return to the system to process the dialog messages. I tried doing a PeekMessage but that doesn't seem to help.
My second approach (which I haven't tried yet) is to do a modal dialog with the dialog class doing all the processing. In this case I would process WM_KICKIDLE messages for the processing.
I also considered using the OnIdle callback to do the processing. But the problem with that approach is OnIdle is in WinApp and the processing is taking place in the View window.
I guess my real question is, how is this normally done? You see see progress dialogs all the time in commercial programs, is there a "standard" way or best way that this is normally done?
Thank you.
Jim
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JRGlide wrote: My first approach was to create a modeless dialog and update the file list and progress bar as I go. But my problem is the dialog never finishes displaying before processing begins, so I can't use the Cancel button. I'll assume its because I'm in a loop and never return to the system to process the dialog messages. I tried doing a PeekMessage but that doesn't seem to help.
You're on the right track. This is the standard way of tackling this problem. Look at this[^] article for details on how to implement the message loop during processing. Just replace the couple of comments at the bottom of the code sample with your processing.
Ryan "Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"
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I think you should use the first method, with a modalless dialog, wich should include a progress control. Than you should add in the parent window, wich does all of your processing, a call to a user defined method like this:
void CYourParentDlg::ProcessIdleMessages()
{
MSG msg;
while(::PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
{
if (msg.message == WM_QUIT)
{
::PostQuitMessage(0);
break;
}
if (!PreTranslateMessage(&msg))
{
::TranslateMessage(&msg);
::DispatchMessage(&msg);
}
}
}
This method will process each message and it will respond to your 'Cancel' button.
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Thanks to both of you for your help. I've been going nuts because I couldn't get either method to work. With the first one I got undefines on the PumpMessage call, and the second one I got undefines with the PreTranslateMessage call.
Then it finally dawned on me, I was trying to call them from an import class that wasn't derived from a Windows class! I guess that's why Mihai told me to do the processing within the parent window. I need to re-structure things. Stay tuned...
And thanks again.
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I am developing a directshow filter, but there are errors when running in graphedt. I do not know how to debug the filter. Thanks for any information about the filter debug. BTW, I am using VS2005.
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I want to send a float in SendMessage instead of a UINT, so I thought I'd use union. I am having issues with unions
(see below). So how does one SendMessage a float?
I gathered that if I make a union
union
{
int n;
float s;
}convert
and do
convert.n = 5;
Then convert.s should give me 5.0
However this is not what I am getting. convert.s doesn't have anything meanngful in it.
Is this not the right way touse a union?
thanks,
sb
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float s = 5.0;
SendMessage(hWnd, msg, 0, (LPARAM) &s);
In the message handler routine, cast LPARAM back to a float.
"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain
"There is no death, only a change of worlds." - Native American Proverb
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Thank you.
Is the messageHandler for the sendMessage like
afx_msg LRESULT OnDrawCursorOnPlot2(WPARAM subsetIndex,LPARAM sampleNum);
or
afx_msg LRESULT OnDrawCursorOnPlot2(UINT subsetIndex, UINT sampleNum);
Where would I find this info? I tried the former, but when I cast the LPARAM back into float
I didn't get back what I sent in.
LRESULT CMagAnView::OnDrawCursorOnPlot2(WPARAM subsetIndex, LPARAM location)
{
float fX = (float)location;
}
and
m_pParentWnd->SendMessage(UDM_DRAWCURSOR,subsetIndex,(LPARAM)&fX);
thank you,
sb
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messagehandler is always like:
afx_msg LRESULT OnDrawCursorOnPlot2(WPARAM subsetIndex,LPARAM sampleNum);
and in the handler you have to get the float value back as below:
LRESULT CMagAnView::OnDrawCursorOnPlot2(WPARAM subsetIndex, LPARAM location){<br />
float *fX = (float*)location;<br />
}
and sendmessage format is:
m_pParentWnd->SendMessage(UDM_DRAWCURSOR,(WPARAM)&subsetIndex,(LPARAM)&fX);
(hope you haven't declared subsetIndex as a poniter, if so no need to put & for subsetIndex)
cheers ...mil10.
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Ah! Thanks!
I guess I got overawed by the LPARAM and didn't realize I needed to dereference the value.
I thank you much for the help.
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Hi there,
meanwhile I've tested a couple of serial communication classes that I've found in the web. Some work and some not.
However, I couldn't find a working example that can transmit single characters. Many support sending strings, but I would need single characters, because I'd like to send to send data from a structure in this manner:
// pointer to structure for sending
const unsigned char *p = (const unsigned char *) &gKupParam;
uart_putc ('<'); // start character
for (i=0;i<sizeof(gKupParam);i++) {
uart_putc (*p++);
}
uart_putc('>'); // end character
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Well, as this is a win32 machine, talking to a serial port is just lake writing data to a file. And sending a character is just like sending a *really* short string! And sending the contents of a structure is like sending it byte by byte...
void SendMyStruct (HFILE hComPort, MyStruct *myStruct)
{
WriteFile (hComPort, &myStruct, sizeof (MyStruct), NULL, NULL);
}
I'm doing the parameters by memory, so you will need to loom them up for yourself.
Iain.
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Thank you for your advice. What class do you use?
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fambi_mail wrote: What class do you use?
Actually, I don't use any classes for my serial communications. I've used MFC for the front end of any application, and a separate thread with overlapping I/O to deal with the serial port side of things. But then again, most of the comms has been *into* the PC, rather than fully two way. When you are multithreading, it can be a problem accessing MFC classes from more than one thread...
But I'm also a bit of a dinosaur control freak, and like doing things the raw way...
I've just a had a peek, and there are several classes to talk with the serial ports in http://www.codeproject.com/system/#Hardware[^]. Unfortunately, I haven't looked at them for quite some time, so I can't recommend any particular one.
Good luck!
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A CEdit redraws itself if I call Invalidate, but then it creates its own PaintDC.
I would like to draw the CEdit to a memory DC to prevent flickering, but I can't find any CWnd method that accepts a DC for painting.
Thanks
Andre
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I guess there is no "CWnd method that accepts a DC for painting".
if u only want "to prevent flickering" of the CEdit, I think you are in a hard way.
u may get better solution if u post the reason why you want to redraw the CEdit - normally CEdit can redraw itself if its text is changed.
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Hi, how can i access a usb device with winapi?
a short example will be very helpful!
bye
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Have you searched CP, or Googled, for USB-related articles?
"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain
"There is no death, only a change of worlds." - Native American Proverb
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