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Hi there!
I'm devolping an communication program, and sometimes I need to do some sleep's. The problem is that I use some external components that use the PostMessage API, and while the app is sleeping, the messages aren't dispatched..
I've developed a funcion with the folowing code:
void DispatchMsg()<br />
{<br />
MSG msg;<br />
DWORD dwi=GetTickCount();<br />
while (::PeekMessage(&msg, NULL, NULL, NULL, PM_NOREMOVE))<br />
{<br />
::TranslateMessage(&msg);<br />
::DispatchMessage(&msg);<br />
if ((GetTickCount()-dwi)>2000)
break;<br />
}<br />
}
But it seems that some time I get some repeated messages... I've also tried replacing the PM_NOREMOVE by PM_REMOVE parameter in the PeekMessage, but some times the app seems to hang...
Do you have any ideias?
Thanks all for your time.
ALMC
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See MsgWaitForMultipleObjectsEx in MSDN.
"tous les sifflets des trains, toutes les sirènes des bateaux
m'ont chanté cent fois la chanson de l'Eldorado"
rechi+
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 How should I use it? Create a foo mutex or event?
I have a main wnd for the app, and a second wnd to receive messages from the comunication component.
I need to call the component api, wait some time so it can send messages to my wnd, and then process them...
ALMC
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Do you want to freeze the window for a while, waiting for the api to throw a message to the queue?
"tous les sifflets des trains, toutes les sirènes des bateaux
m'ont chanté cent fois la chanson de l'Eldorado"
rechi+
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That can be an option!
How do I use the API you've mentioned?
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almc wrote:
How do I use the API you've mentioned?
No, sorry. I was thinking about your component's API 
I don't know what your code is about but if you need to freeze the window - or just a part of it - then you might filter all the messages except those coming from the component and a timer which, when appropriate, signals the timeout as the moment of unblocking. If no freezing is required then you should do nothing, just pump the messages as usual.
Something like this... 
"tous les sifflets des trains, toutes les sirènes des bateaux
m'ont chanté cent fois la chanson de l'Eldorado"
rechi+
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Hello,
Since you use PM_NOREMOVE, the same message gets dispatched as long as 2 ms. You should remove the message for this purpose.
Since you do some communication, may I suggest that you do that in a seperate thread. This doesn't interfere with the GUI and enables you to program more flexible. This also saves you the DispatchMsg() function.
Behind every great black man...
... is the police. - Conspiracy brother
Blog[^]
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It's not a very easy thing to do... I already have to many threads, and some more windows.
The idea is to give the component some time to post to my wnd the results...
Do you know why the PM_REMOVE sometimes hangs the application?
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Hello,
Removing the message using PeekMessage probably doesn't hang your application. Your problem probably is that DispatchMsg() doesn't wait if there is no message available. That function should look like this:
void DispatchMsg()
{
MSG msg;
DWORD dwi=GetTickCount();
while ((GetTickCount()-dwi)<2000)
{
if (::PeekMessage(&msg, NULL, NULL, NULL, PM_REMOVE))
{
::TranslateMessage(&msg);
::DispatchMessage(&msg);
}
else
{
::WaitForSingleObject(::GetCurrentThread(), 50);
}
}
}
Behind every great black man...
... is the police. - Conspiracy brother
Blog[^]
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Hey there,
I bought a microphone that isn't loud enough, so i decided to write a driver solely for increasing the microphone volume, other thing have not to be done.
Now my question, is it possible to write a driver that acts like beeing a normal windows driver, but instead only takes the signal from the original Soundcard driver, and increases the volume of the soundcard's microphone?
Is there any kind of "Wrapper" Driver already available?
Greets,
hircs
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Hi Freinds,
I am working on a dialog based MFC application, i had some combo controls and edit controls added to this application and it was working fine .... now i have added one more combo control and since then i m not been able to execute the applctaion, even it doesnt give any error but also doesnt start at all.... and if i remove the newly added combo control... the applcation works pretty fine ...
Pls help me in this regard .... thanking you all in anticipation....
Mukhan
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Is there anything special about the control? With the control intact, temporarily add the DS_NOFAILCREATE style to the dialog. Do the dialog and the control show up?
"One must learn from the bite of the fire to leave it alone." - Native American Proverb
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I'm currently developing the GUI for an application that interfaces to a hardware data acquisition device. I'd like a window on the GUI that displays read-only textual status information, much like the build/debug console at the bottom of the visual studio IDE. I've placed an Edit control on my dialog and attached a CString member variable to it with global scope. Every time I want to append a new line of text to the output window I append it to the CString member using +=. This way I retain previous output messages. Every time I append some new text I proceed this with SetDlgItemText() to update the edit control text. Ive added a vertical scroll to allow read access to text outside of the edit control window. I have the multi-line style selected
The problem I have is one of orientation. Clearly I want the most recently appended lines to be visible without having to touch the scroll bar, just like on Visual studio, and even the edit box Im entering this text into. However I can't find a way of arranging this. In my application the scroll bar sits at the top of the window by default so that the first few lines of text are visible and you have to scroll down to the more recently appended lines.
Any advice on resolving this problem is greatly appreciated.
Regards,
Adrian
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m_MyEdit.SendMessage(WM_VSCROLL,MAKEWPARAM(SB_BOTTOM,0));
this is this.
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Thanks for your reply.
Im using the code .....
CEdit* pMyEditCtrl = (CEdit*)GetDlgItem(IDC_MyEditCtrl);
pMyEditCtrl->SendMessage(WM_VSCROLL,MAKEWPARAM(SB_BOTTOM,0));
This seems to work, but I need to send the WM_VSCROLL message after each time I set the Edit control text with SetDlgItemText( ). I thought I would be able to set this bottom scroll property once and it would remain static.
Any thoughts??
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adrian27 wrote:
I thought I would be able to set this bottom scroll property once and it would remain static.
Not quite. The code fragment doesn't set a property - it sends a message (i.e. instructs the edit control to scroll to the bottom).
See this[^] article for a self-contained solution.
/ravi
My new year's resolution: 2048 x 1536
Home | Music | Articles | Freeware | Trips
ravib(at)ravib(dot)com
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adrian27 wrote:
I've placed an Edit control on my dialog and attached a CString member variable to it...
Use a CEdit member variable instead. Global variables are rarely, if ever, needed.
For the rest, see here.
"One must learn from the bite of the fire to leave it alone." - Native American Proverb
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I put a picture control (type:rect) in a dialog, and associated it with a CStatic object. I find it doesn't refresh itselt when a window uncovered it.
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So what happens when the static control is uncovered?
"One must learn from the bite of the fire to leave it alone." - Native American Proverb
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What I drew on the static's client is not refreshed, the client became what it was originally.
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followait wrote:
What I drew on the static's client...
How and where are you drawing on the static's client?
"One must learn from the bite of the fire to leave it alone." - Native American Proverb
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I put a picture control (type:rect) in a dialog, and associated it with a CStatic object. I find it doesn't refresh itselt when a window uncovered it.
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hey,
I am working on a drawing application...my drawing area has a height of 400 pixels, x-axis is 600 pixels(scaled: 1 sec=2pixels)...
I am having problem, scaling the y-axis to plot larger values e.g. 2000..
must use default maaping mode(pixels)
how to do it...( need a tested equation...)
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Respected All
------------------------------------
I already sent related query but here a bit explanation.
I have to load a bitmap in picturebox
and let say my bitmap is in
"C:\\my pictures\\bmp1.bmp"
now i want that when i execute my prgram then there is button say "PRESS ME" on main dialog and when i press the button then the above BMP display on the dialog which have already a picture box for loading a bitmap,remember i dont want to load directly on dialog,but i want to load bitmap in picturebox.
Plz help me through MFC code b/c I am suffereing alot from this.
david
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