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Hi all,
I am writing a system where a client communicates with a server and amongst other things tells the server what the client's IP and subnet mask are. However, when there are more than 1 network cards on a PC, how can I programmaticaly know which interface a packet is going to be sent on (for a particular destination)? I know how to get a list of interfaces and relevant details but don't know which one to use.
Mark
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mmica wrote:
I know how to get a list of interfaces and relevant details but don't know which one to use.
The routing service on the PC will determine from the destination address which interface to use. If, for some reason, you need to select an interface in your app, though, the information stored in the routing table for the PC should be sufficient.
Knowing the destination IP address and subnet mask, you should be able to compare it to the routing table in the machine to find which interface the address fits. If you AND the IP address of the host you want to reach with the subnet mask, the resulting network address should fit into one of the route specifications in the routing table.
The illustrations here - The IP Routing Table - MSDN[^] - provide examples and an excellent explanation of how they're used.
Will Build Nuclear Missile For Food - No Target Too Small
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Hi,
How could I make folder as Public Share in windows98 system, so that i can be able to access those files from my service on other system with WindowsXP OS?
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Hi, I'm trying to make a tool using MFC for a game I'm making. And I need a edit control to type in coordinates for objects, and in the end I have to get the coordinate value to be a float. I want the edit control to be fairly user friendly what should I do? Some tutorials seem to make their own classes derived from CEdit, or should I just make a member variable of CEdit type? I've tried making a member variable of type float but that doesn't really seem to let me format the string of the edit control to only accept numeric values etc. If I make a CEdit variable or make my own class derived from CEdit is there some way I can convert the string in the edit control to a float?? Any advice is apreciated 
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there are some masked edit controls here on cp that will do exactly what u are looking for
"there is no spoon"
biz stuff about me
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IN REPLY TO:
some way I can convert the string in the edit control to a float?? Any advice is apreciated
For argument sakes lets say you have an edit box IDC_EDITBOX
Lets say you go to class wizard and add a variable of type CString to that box lets call it m_editbox_string;
then you have a control of type CEdit for that box lets call it m_editbox_edit_control;
Lets say the user types in 2.0094 or whatever in the box
to convert the string do the following
float fHolder=0;
m_editbox_edit_control.GetWindowText(m_editbox_string);
fHolder = atof(m_editbox_string);//atof converts the string to a float
/***********************************************************************
abs
Find absolute value of integer
atof
Convert string to float
atoi, _atoi64
Convert string to int
atol
Convert string to long
_ecvt
Convert double to string of specified length
_fcvt
Convert double to string with specified number of digits following decimal point
_gcvt
Convert double number to string; store string in buffer
_itoa, _i64toa, _itow, _i64tow
Convert int to string
labs
Find absolute value of long integer
_ltoa, _ltow
Convert long to string
_mbbtombc
Convert 1-byte multibyte character to corresponding 2-byte multibyte character
_mbcjistojms
Convert Japan Industry Standard (JIS) character to Japan Microsoft (JMS) character
_mbcjmstojis
Convert JMS character to JIS character
_mbctohira
Convert multibyte character to 1-byte hiragana code
_mbctokata
Convert multibyte character to 1-byte katakana code
_mbctombb
Convert 2-byte multibyte character to corresponding 1-byte multibyte character
mbstowcs
Convert sequence of multibyte characters to corresponding sequence of wide characters
mbtowc
Convert multibyte character to corresponding wide character
strtod, wcstod
Convert string to double
strtol, wcstol
Convert string to long integer
strtoul, wcstoul
Convert string to unsigned long integer
strxfrm, wcsxfrm
Transform string into collated form based on locale-specific information
__toascii
Convert character to ASCII code
tolower, towlower, _mbctolower
Test character and convert to lowercase if currently uppercase
_tolower
Convert character to lowercase unconditionally
toupper, towupper, _mbctoupper
Test character and convert to uppercase if currently lowercase
_toupper
Convert character to uppercase unconditionally
_ultoa, _ultow
Convert unsigned long to string
wcstombs
Convert sequence of wide characters to corresponding sequence of multibyte characters
wctomb
Convert wide character to corresponding multibyte character
_wtoi
Convert wide-character string to int
_wtol
Convert wide-character string to long
************************************************************************/
Hope this helps,
Win32newb
"Making windows programs worse than they already are"
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Thanks alot guys that really helps, one more question though. I'm pretty new to MFC and I've noticed in some tutorials here about numeric edit boxes that they derive a class from CEdit and then in the Visual C++ editor they create a Edit box, and then they write somthing like DDX_Control(blah blah) into the DoDataExchange function...And then the program runs and the edit box only accepts numbers or whatever there derived CEdit class tells it to accept....but in the editor they create a normal edit control, how do they make it so that there edit control gets replaced with that one?
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In an example that i seen that used a derived class. The example i seen was a class derived from CStatic that deals with Labels. You can find it on here.
http://www.codetools.com/staticctrl/clabel.asp#xx562545xx
In any case, after you derive the class and you want it to be listed so you can select it from the class wizard you have to go to your project directory and delete the .clw file. Then inside while your source code is up and running hit control W. This will prompt you for a rebuild. Hit OK and it will rebuild it. then when you look in class wizard you will see the new class as a control. In the example i gave above You had class CLabel derived from CStatic. Only CStatic will show until you do like i said. Then after doing that you will then see under control CLabel.
I hope this helps you out. I'm new at this myself just passing on my findings.
Win32newb
"Making windows programs worse than they already are"
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Does anyone know how to remove the gripper from the bottom right hand corner of a status bar created using:
StatusBar.Create(this)
Thanks
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I Never tried it but I think it can be done removing SBARS_SIZEGRIP style using
::SetWindowLong(GWL_STYLE ...)
after statusbar was created.
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how to hook internet explorer 6.0
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Exactly what do you mean by hooking? 
--
Ich bin der böse Mann von Schweden.
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Maybe I'm just dumb, but even using the code provided by MSDN, I still cannot get this function to work. Please help.
halblonious
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You must also have the database drivers installed.
My neighbours think I am crazy - but they don't know that I have a trampoline. All they see my head bobbing up and down over the fence every five seconds
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i have many many member variables named
m_1 , m_2 , m_3 , m_4 ,....
and i want to access them using a for loop by an index (i) like that :
for (int i=1; i
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Two solutions:
1. Don't use member variables like that. Use an array: m_whatever[100], then it's easy to loop through it:
for (int i = 0; m_whatever[i] = 0; ...)
2. If you must do it with individual variables, you can use a macro, like this:
#define M_(i) m_##i
for (int i = 1; M_(i) = 0; ...)
Regards,
Alvaro
Give a man a fish, he owes you one fish. Teach a man to fish, you give up your monopoly on fisheries.
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Assuming the series are all of the same type, you can make an array of pointers and walk that array. Take care to not fall off the end of the array.
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Visual C++ 6
how can i write to ( or read from) an EDIT BOX
through my code without assigning it a member variable.
hint: i could get a pointer with its address by GetDlgItem() but i could not use it !!
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Use GetWindowText and SetWindowText.
Regards,
Alvaro
Give a man a fish, he owes you one fish. Teach a man to fish, you give up your monopoly on fisheries.
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GetDlgItem(IDC_WHATEVER)->SetWindowText("blah blah");
etc etc
"there is no spoon"
biz stuff about me
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I have a file that is included in a .cpp file and I keep getting this error:
error LNK2001: unresolved external symbol "public: void __thiscall CDBFRecordset::Open(char const *,unsigned int)" (?Open@CDBFRecordset@@QAEXPBDI@Z)
the file is right in the same project directory. anyone know what's going on?
If it's broken, I probably did it
bdiamond
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You may have to change a parameter in the stdafx.h file. Either change from EXTRA_LEAN to LEAN or #include "dao.h" if memory serves.
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In the stdafx.h file in ur current project, include the file <afxdb.h>. Just check the CRecordSet class page in MSDN.
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