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Please give more details.
I think you need to:
1. Open the serial port (CreateFile)
2. Get the state of the DCB (GetCommState)
3. Set dcb.fOutxCtsFlow and dcb.fRtsControl
4. Set the state of the DCB (SetCommState)
Are you doing all of these?
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I am sorry I have Placed my question wrong. I have to control a relay using serial port .The RTS and DTR should become high so that I control my relay.
S.Yamini
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I meant, we need more details about what you are doing in your program - a longer code section, maybe.
Once you set the parameters in the DCB, did you do:
SetCommState(hPort, &dcb);
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I am trying to control a relay via serial port using RTS and DTR pins in serial port . I have set these two pins high via VC++ coding or C. Can we suggest me something.
S.Yamini
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It's difficult to help if you don't show what you are doing already. Maybe you are missing a step in your program, so the lines are not actually going high. If you are setting the pins high, maybe they can not supply enough current to turn on a relay.
Instead of using the control lines, what about using lines on a parallel port? Have a look at this article www.codeproject.com/useritems/PaPiC.asp[^] - it uses the InpOut32 library, which allows direct access to I/O ports.
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hi how to edit boot configuration in vista using bcdedit.exe in mfc program. pls help me . its urgent
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how to make my rich edit ctrl scroll automatically when insert new text?
here's how i insert text
<br />
msg.Insert( msg.GetLength() , "\n");<br />
m_system_message.SetSel(-1,-1);<br />
m_system_message.ReplaceSel(msg);
here's how the richedit is defined in the resource file
CONTROL "",IDC_SYSTEM_MESSAGE,"RICHEDIT",ES_MULTILINE | <br />
ES_AUTOVSCROLL | WS_BORDER | WS_VSCROLL | WS_TABSTOP,11,<br />
257,241,52
as you guys can see, ES_AUTOVSCROLL is definately there
but whenever i insert new text using ReplaceSel, the text focus is always at the top. how do i make it such that it automatically scrolls down to read the latest text inserted?
using
- mfc
- vc6.0
- winxp
thanks in advance!
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I think ES_AUTOVSCROLL is there to help scroll the window when the user inputs text using the keyboard etc. But for automatic additions to the control, I think you could send it a message to scroll itself after adding text to it.
m_system_message.SendMessage(WM_VSCROLL,MAKEWPARAM(SB_BOTTOM,0));
Then it should scroll to the bottom, and the cursor, if in it, should appear at the end of the last line.
this is this.
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Hi,
Can we get the address of a winAPI (from Advapi32.dll) without using GetProcAddress or IAT scan? Is it possible?
Basically, I want to obfuscate the api call in source code level.
Thanks,
GNU:lihd
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But why you dont want to use GetProcAddress?
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to obfuscate the api call in source code level.
If i can find the procAddress then i will obfuscate using assembly call and api redirections so that it would be harder to find out which API is being called (looking at the source).
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Yes. This code should point you in the right direction. It outputs the names of all the functions exported by name from "Kernel32.dll":
#include "stdafx.h"
#include <iostream>
#include <windows.h>
LPVOID PrintFunctions(HMODULE hMod)
{
PIMAGE_DOS_HEADER pDOS = (PIMAGE_DOS_HEADER)hMod;
PIMAGE_NT_HEADERS pNew = (PIMAGE_NT_HEADERS)((char*)pDOS+pDOS->e_lfanew);
PIMAGE_OPTIONAL_HEADER pOpt = &(pNew->OptionalHeader);
PIMAGE_EXPORT_DIRECTORY pExport =
(PIMAGE_EXPORT_DIRECTORY)((char*)pDOS+pOpt->DataDirectory[IMAGE_DIRECTORY_ENTRY_EXPORT].VirtualAddress);
UINT_PTR *pNameArray = (UINT_PTR*)((char*)pDOS+pExport->AddressOfNames);
for (DWORD i=0; i<pExport->NumberOfNames; ++i)
{
LPCSTR pName = (LPCSTR)((char*)pDOS+pNameArray[i]);
std::cout << pName << std::endl;
}
return NULL;
}
int main(int arvc, char* argv[])
{
HMODULE hMod = GetModuleHandle("kernel32.dll");
PrintFunctions(hMod);
return 0;
}
Steve
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Hi,
Where I could learn this kind of learning. Please point me to the right guides to do kernel/system programming?
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Dear all,
What is the MTS funtion and what is the advantage of using MTS Funtion....
Thanks in advance
vikas da
vikas da
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Hi All,
I need to define some array that will hold one bit in each cell.
I want to do it with BitArray - but i don't find in any place the size of each cell in this array.
Someone know the size of elements in bitArray ?
How can i define array that each element is only one bit ?
Thanks for any help.
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Yanshof wrote: I want to do it with BitArray
This is a .NET class. Either this is not the right forum or it is the wrong type (have a look to std::bitset, std::vector< bool > classes).
Yanshof wrote: but i don't find in any place the size of each cell in this array.
Someone know the size of elements in bitArray ?
Why do yoou need the above?
How can i define array that each element is only one bit ?
see std::bitset, and std::vector< bool > documentation.
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
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I want to display a separate dialog with list control when pushing a button in main dialog,
and to get the selected list item text when the dialog is closed.
My code is as follows:
In main dialog button click:
<br />
NewDlg obj= new NewDlg();<br />
obj.DoModal();<br />
In the dialog class constructor:
CListBox *pList;<br />
pList = (CListBox*)GetDlgItem(IDC_LIST1);<br />
pList->AddString("1");<br />
pList->AddString("2");<br />
An error saying "Debug assertion failed" is coming at AddString().
Any help would be greatly appreciable.
Best Regards,
Suman
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Maybe you can use of this code:
CMain* m_main=(CMain*)GetParent();
m_main->yourcontrol
if we suppose CMain is your class.
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Move the code from your constructor to the end of th OnInitDialog function and you should not get the assertion. When the constructor is called your dialog has not been created yet, so GetDlgItem(IDC_LIST1) returns NULL as it can not find the specified resource. You can not call an member of a pointer when the pointer is NULL.
Artificial Intelligence is no match for Natural Stupidity
No one can understand the truth until he drinks of coffee's frothy goodness. ~Sheik Abd-al-Kadir
I can't always be wrong ... or can I?
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rp_suman wrote: NewDlg obj= new NewDlg();
obj.DoModal();
 What is this? If you are going to use the new operator, you have to have a pointer:
NewDlg *obj= new NewDlg();
obj->DoModal(); But this is unnecessary. Just use:
NewDlg obj;
obj.DoModal(); The calls to AddString() must be done in the OnInitDialog() method.
"A good athlete is the result of a good and worthy opponent." - David Crow
"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne
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Hi,
Thanks for your great help.
I changed the code as you mentioned.
I am displaying the new dialog from the main dialog's OnInitDialog() function.
But how can I get the text of selected list item in new dialog after user clicked "OK".
My code is as follows:
NewDlg obj;<br />
obj.DoModal();<br />
<br />
CListBox* pList;<br />
pList = (CListBox*)obj.GetDlgItem(IDD_DIALOG1);<br />
DWORD strSelect = pList->GetItemData(pList->GetCurSel());
I am getting Debug Assertion when calling GetDlgItem().
Best Regards,
Suman
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rp_suman wrote: But how can I get the text of selected list item in new dialog after user clicked "OK".
By doing so in the OnOK() method.
rp_suman wrote: I am getting Debug Assertion when calling GetDlgItem().
Because you are trying to access a non-existent window. Once DoModal() returns, any windows it owned are destroyed.
"A good athlete is the result of a good and worthy opponent." - David Crow
"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne
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