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I'm writing an app and connects a computer to another peice of hardware via the serial port. I've got everything working however while writing my comm port settings to the registry, I found that I do not know how to determine what the flow control setting is set to. Has anyone worked with the flow control settings and know what from the DCB structure I'm suppsed to use that dertmines that?
Thanks
Tom Wright
tawright915@yahoo.com
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The documentation for the DCB structure did not help answer that question for you? Please explain how/why it is not sufficient.
"No matter where you go, there your are." - Buckaroo Banzai
-pete
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it does not directly tell you whether it is xon/xoff or hardware or none. Not sure what in the DCB I need to look to determine what the user has set that setting for.
Tom Wright
tawright915@yahoo.com
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Oh, sorry, didn't understand your goal.
"No matter where you go, there your are." - Buckaroo Banzai
-pete
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Tom:
This is probably what you are looking for.
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/devio/base/dcb_str.asp
In particular:
(For XON/XOFF)
fOutX
Indicates whether XON/XOFF flow control is used during transmission. If this member is TRUE, transmission stops when the XoffChar character is received and starts again when the XonChar character is received.
fInX
Indicates whether XON/XOFF flow control is used during reception. If this member is TRUE, the XoffChar character is sent when the input buffer comes within XoffLim bytes of being full, and the XonChar character is sent when the input buffer comes within XonLim bytes of being empty.
fRtsControl
RTS (request-to-send) flow control. This member can be one of the following values. Value Meaning
RTS_CONTROL_DISABLE Disables the RTS line when the device is opened and leaves it disabled.
RTS_CONTROL_ENABLE Enables the RTS line when the device is opened and leaves it on.
RTS_CONTROL_HANDSHAKE Enables RTS handshaking. The driver raises the RTS line when the "type-ahead" (input) buffer is less than one-half full and lowers the RTS line when the buffer is more than three-quarters full. If handshaking is enabled, it is an error for the application to adjust the line by using the EscapeCommFunction function.
RTS_CONTROL_TOGGLE Specifies that the RTS line will be high if bytes are available for transmission. After all buffered bytes have been sent, the RTS line will be low.
Windows Me/98/95: This value is not supported.
fOutxCtsFlow
If this member is TRUE, the CTS (clear-to-send) signal is monitored for output flow control. If this member is TRUE and CTS is turned off, output is suspended until CTS is sent again.
And Possibly ...
fDtrControl
DTR (data-terminal-ready) flow control. This member can be one of the following values. Value Meaning
DTR_CONTROL_DISABLE Disables the DTR line when the device is opened and leaves it disabled.
DTR_CONTROL_ENABLE Enables the DTR line when the device is opened and leaves it on.
DTR_CONTROL_HANDSHAKE Enables DTR handshaking. If handshaking is enabled, it is an error for the application to adjust the line by using the EscapeCommFunction function.
fOutxDsrFlow
If this member is TRUE, the DSR (data-set-ready) signal is monitored for output flow control. If this member is TRUE and DSR is turned off, output is suspended until DSR is sent again.
Let me know if you need any other help, hopefully these are enough to get you by!
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I understand what the MSDN is saying about this structure but my problem is that while the COMMCONFIG dialog box is returning back the users configuration choices, I do not see anything for flow control. For instance I know what the user choose for baud by looking at dcb.baudrate or for parity by looking at dcb.parity, but I do not know what to look at for flow control.
Tom Wright
tawright915@yahoo.com
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How about something such as this:
if ((m_DCB.fRtsControl == RTS_CONTROL_HANDSHAKE) && (m_DCB.fOutxCtsFlow)) {
// CTS/RTS control is enabled (This is hardware flow control)...
}
if ( (m_DCB.fOutX) && (m_DCB.fInX)) {
// XON / XOFF is enabled (Software flow control)
}
If neither of the above statements are true, flow control (hardware and software) is disabled.
Hopefully that is what you are looking for.
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Here's a little chunk of code that may help you with the various forms of Flow Control ... Knowing what to set for each mode of flow control.
case NoFlowControl:
{
dcb.fOutxCtsFlow = FALSE;
dcb.fOutxDsrFlow = FALSE;
dcb.fOutX = FALSE;
dcb.fInX = FALSE;
break;
}
case CtsRtsFlowControl:
{
dcb.fOutxCtsFlow = TRUE;
dcb.fOutxDsrFlow = FALSE;
dcb.fRtsControl = RTS_CONTROL_HANDSHAKE;
dcb.fOutX = FALSE;
dcb.fInX = FALSE;
break;
}
case CtsDtrFlowControl:
{
dcb.fOutxCtsFlow = TRUE;
dcb.fOutxDsrFlow = FALSE;
dcb.fDtrControl = DTR_CONTROL_HANDSHAKE;
dcb.fOutX = FALSE;
dcb.fInX = FALSE;
break;
}
case DsrRtsFlowControl:
{
dcb.fOutxCtsFlow = FALSE;
dcb.fOutxDsrFlow = TRUE;
dcb.fRtsControl = RTS_CONTROL_HANDSHAKE;
dcb.fOutX = FALSE;
dcb.fInX = FALSE;
break;
}
case DsrDtrFlowControl:
{
dcb.fOutxCtsFlow = FALSE;
dcb.fOutxDsrFlow = TRUE;
dcb.fDtrControl = DTR_CONTROL_HANDSHAKE;
dcb.fOutX = FALSE;
dcb.fInX = FALSE;
break;
}
case XonXoffFlowControl:
{
dcb.fOutxCtsFlow = FALSE;
dcb.fOutxDsrFlow = FALSE;
dcb.fOutX = TRUE;
dcb.fInX = TRUE;
dcb.XonChar = 0x11;
dcb.XoffChar = 0x13;
dcb.XoffLim = 100;
dcb.XonLim = 100;
break;
}
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Hi,
As my subject says, I'm trying to get the active projet of a solution opened in visual studio .net 2003.
The only code that I found on that is the following :
CComVariant varActiveSolutionProjects;
pDTE->get_ActiveSolutionProjects(&varActiveSolutionProjects);
if(varActiveSolutionProjects.vt == (VT_ARRAY|VT_VARIANT))
{
CComVariant varProj;
LONG lLBound, lUBound;
SafeArrayGetLBound(varActiveSolutionProjects.parray, 1, &lLBound);
SafeArrayGetUBound(varActiveSolutionProjects.parray, 1, &lUBound);
if((lUBound - lLBound) != 0)
{
return;
}
SafeArrayGetElement(varActiveSolutionProjects.parray, &lLBound, &varProj);
pActiveProjectDisp = varProj.pdispVal;
pProject = pActiveProjectDisp;
}
The problem is that I can't do
pProject = pActiveProjectDisp
Is there a way to assing cast pActiveProjectDisp to pProject ?
Thanks.
Nic
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I've got a multidocument MFC application: a text view and OpenGL view. I've used accelerators for arrows, Home, End keystrokes to provide user some keyboard interface for OpenGL view. But these accelerators are engaged as weel in text view, and, as there're no handlers for them in text view class, won't work at all.
My question is: how can I 'divide' these accelerators between two views using default handlers in text view and my own handlers in OpenGL view?
Thank you for your attention.
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In an SDI app , I m trying to do the following :
My View creates a Wnd and I am trying to dynamically create some controls ( CStatics)
Something like this
Test Test status
test 1 Running ....
test 2 Untested
test 3 Untested
All text are within their CStatics . I was trying to Color Code the Test Status
Like blue while running
red for failed
green for passed
grey for untested .
So I create a Class that inherits from CStatics and according to the article
HOWTO: Change the Color of an MFC Child Control Class
ID: Q132080
I overrode the OnChildNotify method
Here is what I do .
<br />
int value = 0; <br />
#define BACKCOLOR RGB(190,190,190)<br />
<br />
<br />
const COLORREF colors [] = { <br />
RGB(255,0,0),<br />
RGB(0,255,0),<br />
RGB(0,0,255)<br />
};<br />
<br />
<br />
#define VALUECOLOR colors[value]<br />
<br />
BOOL CColoredStatic::OnChildNotify(UINT message, WPARAM wParam, LPARAM lParam, LRESULT* pLResult) <br />
{<br />
<br />
if (message != WM_CTLCOLORSTATIC)<br />
{<br />
return CStatic::OnChildNotify(message,wParam,lParam,pLResult);<br />
}<br />
<br />
HDC hdcChild = (HDC)wParam;<br />
COLORREF oldTextColor = GetTextColor(hdcChild);<br />
COLORREF oldBkColor = GetBkColor(hdcChild);<br />
SetTextColor(hdcChild, VALUECOLOR );<br />
<br />
SetBkColor(hdcChild, BACKCOLOR);<br />
<br />
*pLResult = (LRESULT)(m_brush.GetSafeHandle());<br />
<br />
<br />
<br />
return TRUE;<br />
<br />
}<br />
<br />
void CColoredStatic::ChangeValue(const int &newVal)<br />
{<br />
value = newVal;<br />
Invalidate();<br />
}<br />
What I find is that after changing the value of "value" externally for the first CColorStatic object , all the CStatics get painted with the same color . Where the desired effect is to just update that Object .
My questions
when i do this
SetTextColor(hdcChild, VALUECOLOR );<br />
<br />
SetBkColor(hdcChild, BACKCOLOR);
So I have to restore the Color setting for the remaining controls ?
If yes what is that Call ? Something like a restoreObject !!!!!!!!
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If I am reading your code correctly: value is a global variable, which is the problem. The variable value should be a class member, so that it only applies to the current CColoredStatic derived control, instead of all of them.
INTP
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I m sorry it is a private data member of the class .
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i have an compiled HtmlHelp file I'm using with my application. When I call the following function from MainFrame.cpp
<br />
::HtmlHelp(GetSafeHwnd(), "GameOn.chm::/Welcome.html", HH_DISPLAY_TOC, 0);<br />
it works fine. Using the same code in a DLL for my application, I doesn't work. What's more weird is that if I call Help from MainFrame first, then call help from a DLL, it works. If I call help from the DLL first and then try to call help from the MainFrame.cpp it doesn't work.
Is there something I might be missing from my DLL call that should be included? The htmlhelp.lib is being imported and the htmlhelp.h is referenced.
Thanks!
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HtmlHelp is more sensitive to the 'process' than the Window handle, like WinHelp used to be.
Try passing the top level window of your application as the first parameter.
Even from a DLL, we just use ::GetDesktopWindow() instead.
When your program quits, or if you want to programaticlaly dismiss help, use the HH_CLOSE_ALL command.
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<br />
::HtmlHelp(::GetDesktopWindow(), "GameOn.chm::/Welcome.htm", HH_DISPLAY_TOC, 0);<br />
This didn't work. 
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Provide the FULLY QUALIFIED file path to your help file.
You might not be the current directory when help is invoked. HTMLHelp doe snot otherwise know where to find your help file.
For exmaple:
::HtmlHelp(::GetDesktopWindow(), "C:\\Program Files\\Common Files\\MyCompanyName\\MyProductName\\GameOn.chm::/Welcome.htm", HH_DISPLAY_TOC, 0);
See if that works.
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In VC 6.0 there was a way to make a custom appwizard then base it off of an existing project. I can't find this option in the .net environment. Is this no longer supported, or am I just looking in the wrong place? Thanks in advance.
[insert witty comment here]
bdiamond
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Hey all. I'm having a problem getting a connection to a SQL Server to timeout. What is happening is I am using CDatabase::OpenEx (code below). If the computer is disconnected from the network, or the database server is down, the program just hangs forever. It never even times out after five or ten minutes and I have to manually end the process.
Here's what I'm using to connect:
CString DBCONNECT = "Driver={SQL Server};Connection Timeout=10;Server=DSC\\DAVEINSTANCE;Database=Master;Uid=sasd; Pwd=blah;"
(I put a space between ; and Pwd because the smiley was showing up)
CDatabase myDB;
myDB.SetLoginTimeout(10);
TRY {
myDB.OpenEx(DBCONNECT,CDatabase::noOdbcDialog);
.... I've tried without "Connection Timeout=10;" in the connection string, and only using myDB.SetLoginTimeout ... and vice versa ... without SetLoginTimeOut. I've also tried "Connect Timeout=10" Neither of these are working. I saw in the MSDN that some connections do not allow SetLoginTimeout, but I'm guessing there has to be a way to time out the connection instead of having the program hang on myDB.OpenEx().
Any help would be appreciated.
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I am running a server client based application using VC++. I am using DDEML to initialize the DDE and creating string handles. Using Excel as the client application. when i run the .exe created from VC++, after say 2 hours the system starts slowing down and the CPU usage reaches 100%. Could someone please let me know how to make sure that CPU doesn't go 100%.
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swerajan wrote:
...and the CPU usage reaches 100%.
Of which process?
"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen
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when i run my application(ddemlsrv.exe) the csrss.exe process gradually uses upto 80% of the CPU along with the ddemlsrv.exe it reaches 100%. I don't understand what is wrong with the program.
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I've been trying to write a MP3 ripper myself, because
I can't find any good one online. I have been searching
for this similar project for a while, all I can find is
encoder.
While I do need an encoder, the first step I need is to
know how do I read a .cda file from a CD? I've been wondering
if fread() would work in this case, because I don't even
know if .cda is a binary file or not? Is it a binary file?
Please help me, or if you know similar project elsewhere,
would you please share it?
-----------------------------
C++ without virtual functions is not OO. Programming with classes but without dynamic binding is called "object based", but not "object oriented".
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I m facing a problem in my project. Actually i have drawn a line in VC++ using moveTo and lineTO function. now if user double clicks the line a dialog box should be open. What the problem is to check wheather the user clicks on the line or not. for this i have created the boundry rectangle of the line i.e if the statement is like
pDC->MoveTo(x1,y1);
pDc->LineTo(x2,y2);
then the boundry rect will be Rectangle(x1,y1x2,y2). in this case the tolerance level(clickedpoint+-value) is very high. if user click say 5-10 Points far from the line still the dialog box will be opened. i want to reduce the size of the boundary rect. keep in mind there should not be any effect on the orentation of line
Let me know plzzz if any one have solution to this problem
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