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As Usual I am Confuse. Sorry for giving wrong INFO
"I Think this Will Help"
<h5
alok gupta="" <br=""> visit me at http://www.thisisalok.tk
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I am writing an application in Embedded C++ 4.0 for a PocketPC and have run into a problem. I am retrieving 4 bytes of data from a PLC (Programmable Logic Controller) via a custom written winsock based interface. These 4 bytes (32 bits) are a IEEE real number. I am trying to get these 4 bytes into a C++ float type. they are currently in a buffer array i.e. DataBuff[0],[1],[2],[3]
The PLC is an AutomationDirect DL06.
Greg Keys
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I think you would have more precision if you used a double instead.
"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
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The precision is not the issue. In the PLC there is only one kind of real number; IEEE 32 bit. The problem I have is that I have 4 chars full of bits, in the right format for a type float, but c++ will not let you do bit manipulation of a float. I need to get this bit pattern into a type real.
Greg Keys
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Try this :
float f;
memcpy( &f, DataBuff, sizeof( float ) );
if the byte order is wrong then swap them in DataBuff since it holds the individual bytes.
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OF COURSE!!!!! (slapping self in forhead) That does the trick....
Thanks much 
Greg Keys
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how can i emulation available serial com?
can i emulate serial com from my vc++ project?
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www.codeproject.com/useritems/serial_portsenum_fifo.asp
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I want to create a dll which could return several results by parameters, like API function?
Then VB program could visit the function in dll and get multi results.
How to do it?
Thanks!
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Hi,
I suggest to you use COM programming. The COM Technology can use ATL com methods as well as Win32 API Programming. It will returns result can use any programming language(like VB, C, C++).
Regards,
Selvam
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I have not worked with messaging between windows.
If I have a modeless dialog serving as the main window of an app that opens another modeless dialog, how do I notify the main window when the modeless child window has been closed?
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Put the window handle of the parent modeless dialog into a member variable of the child modeless dialog's class.
When the child modeless dialog is closing, capture the events with handlers, such as WM_CLOSE, WM_DESTROY, etc. In those handler,s post a registered window message to the parent window that informs the parent the child is closing.
That should work VERY well.
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Hi,Everyone:
i'm running a program as form-based, Doc/view struct. i create a thread in the initialization of the
program, and in thread, we use while(1) circulation.
it runs well usually, but we'll get unexpected error dialog, (and program shut down), this is following error
infomation:
"access violation at 0x00000000: read of address 0x00000000". Process Stopped.
Can any one of you give me some suggestions? Thanks!
________________________________________
Many nights we've prayed with no proof anyone could hear, we were moving moutains long before we knew we could!
Yet now i'm standing here, although we know there's much to fear, hope seemed like summer bird too swiftly flown away ...
There can be miracles! When you believe, though hope is frail, it's hard to kill!
Who knows what miracles, you can achieve! When you believe, somehow you will ...
YOU WILL WHEN YOU BELIEVE
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In My CvcydcjDoc Class, i have such kind of memory to store data.
<br />
class CvcydcjDoc : public CDocument<br />
{<br />
protected:
CvcydcjDoc();<br />
DECLARE_DYNCREATE(CvcydcjDoc)<br />
<br />
public:<br />
struct MEM_MEMORY{<br />
int State;
<br />
char szBz[100];
int nCjzcs;
int nSbzcg;
int nZdcjcs;
char szZje[12];
int nCjcgcs;
int nZdcjcgcs;
int nCjymcs;
int nZdcjsbcs;
char szRowid[20];<br />
char szCjzt[2];
<br />
...<br />
<br />
};<br />
<br />
MEM_MEMORY memRead[2000];<br />
and in my thread, i access data using this way:
1. First i get the Doc pointer:
CMainFrame* pMainFrmWnd = (CMainFrame*)AfxGetMainWnd();<br />
ASSERT(pMainFrmWnd != NULL);<br />
CvcydcjView* pMyView = NULL;<br />
CWnd* pchildWnd = pMainFrmWnd->GetWindow(GW_CHILD);<br />
ASSERT(pchildWnd->GetSafeHwnd() != NULL);<br />
pMyView = (CvcydcjView*)pchildWnd;<br />
ASSERT(pMyView != NULL);<br />
CListCtrl* pList = (CListCtrl*)pMyView->getItem(IDC_LIST_DIAL);<br />
CListCtrl* pListMsg = (CListCtrl*)pMyView->getItem(IDC_LIST_MESSAGE);<br />
CStatic* pCjcount = (CStatic*)pMyView->getItem(IDC_CJCOUNT);<br />
CStatic* pCjymcount = (CStatic*)pMyView->getItem(IDC_CJYMCOUNT);<br />
CStatic* pCjcgcount = (CStatic*)pMyView->getItem(IDC_CJCGCOUNT);<br />
CStatic* pCjcscount = (CStatic*)pMyView->getItem(IDC_CJCSCOUNT); <br />
CvcydcjDoc* pMydoc = (CvcydcjDoc*)lp;<br />
then i manipulate that data in this way:
<br />
...<br />
strcpy(pMydoc->memRead[nRecNumber].szCjzjhm,str);<br />
...<br />
i don't know whether it's the problem or not...
Hope someone can help me,,, Thx!
________________________________________
Many nights we've prayed with no proof anyone could hear, we were moving moutains long before we knew we could!
Yet now i'm standing here, although we know there's much to fear, hope seemed like summer bird too swiftly flown away ...
There can be miracles! When you believe, though hope is frail, it's hard to kill!
Who knows what miracles, you can achieve! When you believe, somehow you will ...
YOU WILL WHEN YOU BELIEVE
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This kind of error can occur when the instruction pointer (IP) gets confused when returning from a message handler. One way to fix this is to make sure all your custom message handlers are in the format LRESULT MyClass::OnMyMessage(WPARAM wp, LPARAM lp). Make sure you declare both the WPARAM and the LPARAM on all you message handlers even if you think they are not needed. Also have them return LRESULTs not voids.
HTH
"You're obviously a superstar." - Christian Graus about me - 12 Feb '03
"Obviously ??? You're definitely a superstar!!!" mYkel - 21 Jun '04
Within you lies the power for good - Use it!
Honoured as one of The Most Helpful Members of 2004
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Thanks,PJ Arends!
But in my program i didn't use message handlers  (i planned to use once, but now i didn't use it. Maybe cos i remained the definition?? )
<br />
#define WM_OPENRECORD WM_USER + 100 //<br />
#define WM_STARTCALL WM_USER + 101 //<br />
and i found i made a stupid mistake:
<br />
while(1)<br />
{<br />
<br />
pRs = new CADORecordset(pAdoDb);<br />
<br />
while(DB_CONNECTED)<br />
{<br />
Dosomething();<br />
<br />
if(DB_problem)break;<br />
}<br />
}<br />
it seemed i forgot to "delete pRs"!
<br />
while(1)<br />
{<br />
<br />
pRs = new CADORecordset(pAdoDb);<br />
<br />
while(DB_CONNECTED)<br />
{<br />
Dosomething();<br />
<br />
if(DB_problem)break;<br />
}<br />
delete pRs;<br />
}<br />
maybe this cause the problem? i'm not sure, now i'm letting the program run and watch whether i get next error. (if i do get, i'll go to ask you again,hope you don't feel it's a trouble  )
Thank you sooooooooo much!  Have a good day!!
________________________________________
Many nights we've prayed with no proof anyone could hear, we were moving moutains long before we knew we could!
Yet now i'm standing here, although we know there's much to fear, hope seemed like summer bird too swiftly flown away ...
There can be miracles! When you believe, though hope is frail, it's hard to kill!
Who knows what miracles, you can achieve! When you believe, somehow you will ...
YOU WILL WHEN YOU BELIEVE
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hi. im just new in using VC++/MFC. does anyone know how to read an existing text file then transfer it to a Word document. like i select a text file, then when i press a button, a new file, which is a Word document, is generated. thanks for any ideas.. 
*************************************************************
Every man has a right to be stupid. Others abuse the right.
*************************************************************
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generally, a computer has three or more drivers c: d: e:...
question is: how to get the system driver in program.
The sea is so big and my boat is so small.
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Can anyone guide me on how to go about programmatically powering down a Windows 98 system - I'm pretty confused about what sequence of functions should be used to achieve this. Any recomendadtions would be appreciated !
Doug
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Lookup ExitWindowsEx in MSDN.
"You're obviously a superstar." - Christian Graus about me - 12 Feb '03
"Obviously ??? You're definitely a superstar!!!" mYkel - 21 Jun '04
Within you lies the power for good - Use it!
Honoured as one of The Most Helpful Members of 2004
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I tried to use the sample code given in MSDN for shutting down the system using ExitWindowsEx(). (I've reproduced it below for reference):-
BOOL MySystemShutdown()
{
HANDLE hToken;
TOKEN_PRIVILEGES tkp;
// Get a token for this process.
if (!OpenProcessToken(GetCurrentProcess(),
TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, &hToken))
return( FALSE );
// Get the LUID for the shutdown privilege.
LookupPrivilegeValue(NULL, SE_SHUTDOWN_NAME,
&tkp.Privileges[0].Luid);
tkp.PrivilegeCount = 1; // one privilege to set
tkp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
// Get the shutdown privilege for this process.
AdjustTokenPrivileges(hToken, FALSE, &tkp, 0,
(PTOKEN_PRIVILEGES)NULL, 0);
if (GetLastError() != ERROR_SUCCESS)
return FALSE;
// Shut down the system and force all applications to close.
if (!ExitWindowsEx(EWX_SHUTDOWN | EWX_FORCE, 0))
return FALSE;
return TRUE;
}
It worked fine on my Win2000 Pro system but not on the Win98 machine (for which I actually need it !). It fails on the
OpenProcessToken() function and when I call GetLastError() in response, it returns a value of 120 ("The function is not
supported on this system")
How should I be using ExitWindowsEx on Win98 ?? (or is there a better way to do it ?)
Thanks for any help !
Doug
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Windows 9x does not use privileges, just call ExitWindowsEx directly. You can use GetVersionEx to see if the program is running on 9x or NT.
"You're obviously a superstar." - Christian Graus about me - 12 Feb '03
"Obviously ??? You're definitely a superstar!!!" mYkel - 21 Jun '04
Within you lies the power for good - Use it!
Honoured as one of The Most Helpful Members of 2004
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Hi again !!
I have now just used ExitWindowsEx(), but the program just returns without causing the PC to power down - however, I can't get it to stop at a breakpoint beyong ExitWindowsEx(). I should say that this was the problem that I had before I made my original post asking for help !! I'm calling the function as follows:-
BOOL rc;
rc = ExitWindowsEx(EWX_POWEROFF | EWX_FORCE | EWX_LOGOFF, 0);
if (!rc)
{
dwError = GetLastError();
}
Hopefully someone can tell me what I'm doing wrong !!
Doug
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From the MSDN article on ExitWindowsEx
Parameters
uFlags
[in] Specifies the type of shutdown. This parameter must include one of the following values. This leads me to believe that the EWX_* values you specified are supposed to be mutually exclusive.
"You're obviously a superstar." - Christian Graus about me - 12 Feb '03
"Obviously ??? You're definitely a superstar!!!" mYkel - 21 Jun '04
Within you lies the power for good - Use it!
Honoured as one of The Most Helpful Members of 2004
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