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Hi sir,
I am doing some mathematical calculation.
where i am reading values from Dialog edit box control.
Here is .h file
ex.h
Dialog Data
enum { IDD = IDD_DIALOG_SOURCE_DETAILS };
CMSMask m_val1;
CMSMask m_val2;
CMSMask m_val3;
here is .cpp file
m_val1.GetText();
m_val2.GetText();
m_val3.GetText();
I am using this exp to get the result
A = B Exp(-0.693 * t/T)
B = m_val1.GetText();
t = m_val2.GetText();
T = m_val3.GetText();
I am trying with this.
h = (-0.693 * t/T);
res = B^h;
Can i pass the values(B,t an T) directly to the expression and get the result or i convert it to double(using atof).
Thanks
Raj
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GetText as the name indicates must be returning strings.
You cannot evaluate expressions on strings.
So you have to first do the conversion.
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You'll have to use something like atof (excuse me while I rinse my fingers off for typing that) or another conversion. What you get off the controls is a string of some sort.
Secondly are you sure your maths is correct? Is:
A = Kexp( -kt )
really
A = K ^ (1 / kt )
or is it
A = K * e ^ (-kt)
where ^ is "raising to the power of"? Most maths texts I've read would say the later, which makes your equation something similar to the one describing radioactive decay, capacitor discharge or acoustic attenuation. Actually thinking about it are you sure the equation isn't:
A = K * 10 ^ (-kt )
as -0.693 is the natural log of 0.5 (IIRC)? This is a big hint to me that T is actually a half-life and something's got very bent in translation.
Final point: C++ has an ^ operator, but it's not going to help you with your code. You're going to need either std::exp or std::pow to get a result here.
Cheers,
Ash
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Hi,
I use this code to terminate calc.exe on Windows Vista and Windows 7
DWORD fdwExit = 0;
HANDLE hProcess = GetProcessHandle("calc.exe");
GetExitCodeProcess(hProcess, fdwExit);
TerminateProcess(hProcess, fdwExit);
CloseHandle(hProcess);
On Windows XP SP3 the above code doesn't have any effect!
any idea? thanks
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TerminateProcess is an iffy call, depending on the dlls and child processes, the code could hang.... Microsoft wrote a "better way" to handle termination:
http://support.microsoft.com/default.aspx?scid=KB;EN-US;Q178893&[^]
basically you send a WM_CLOSE message to the applications main thread and then the application terminates itself. This is similar to what happens to an application when you send a shutdown command while it is running. Of course then you are dependant upon the programmer of the application to have properly handled the WM_CLOSE and terminate.... and we all know all programs exit gracefully and never hang upon shutdown. 
_________________________
John Andrew Holmes "It is well to remember that the entire universe, with one trifling exception, is composed of others."
Shhhhh.... I am not really here. I am a figment of your imagination.... I am still in my cave so this must be an illusion....
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Put in some error checking on the return values and debug the program to find out exactly where the problem occurs.
Also, what is GetProcessHandle?
It is not an API.
It must be a user defined function.
Check if it is returning a valid handle.
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Sorry my mistake, here's the GetProcessHandle void
HANDLE CmyGUIApp::GetProcessHandle(LPSTR szExeName)
{
PROCESSENTRY32 Pc = { sizeof(PROCESSENTRY32) };
HANDLE hSnapshot = CreateToolhelp32Snapshot(TH32CS_SNAPALL, 0);
if(Process32First(hSnapshot, Pc)){
do{
if(!strcmp(Pc.szExeFile, szExeName))
{
return OpenProcess(PROCESS_ALL_ACCESS, TRUE, Pc.th32ProcessID);
}
}while(Process32Next(hSnapshot, Pc));
}
return NULL;
}
Debugging the program on Windows 7 where on I have my VC++ installed doesn't show any error or any thing strange, I can terminate any process just by replacing "calc.exe" with another process name, the void above returns the exact process handle and the process gets terminated. Should I debug the program on Windows XP? How? I have only one license of VC++ which is currently installed on Windows 7, can I use WinDbg to debug my program on XP and how? please guide me I am new to all of this staff! Thanks
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If you're familiar with Windbg its fine, but otherwise you could try Remote Debugging[^] in Visual Studio.
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Hi all
Which book is good for MFC Hard disk programing book Or Online tutorial link?
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mdocvc wrote: MFC Hard disk programing
What is MFC hard disk programming ?
Watched code never compiles.
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Maximilien wrote: What is MFC hard disk programming ?
Not easy! 
It's time for a new signature.
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I would recommend you this excellent book for MFC if you are advanced [^] and this useful tutorial if you are beginner [^].
Life is a stage and we are all actors!
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Very helpful link. Thanks Hristo!
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hello guys...im newbie and wanted to learn pocketpc 2003 programing using c++ (using MS VS 2008), but could not find the appropriate book (may be could not find porper key words for query to google). I will be thankful if you suggest me one. Also, I wanted to learn MFC using MS VS 2008, a book on this topic will also be appreiated (i found books on MFC but not MFC using VS 2008).Thanks in advance.
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Muzammil Saeed wrote: may be could not find porper key words for query to google
What could be easier than this[^]?
It's time for a new signature.
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So long story short, I am investigating using Winsock/UDP to communicate between two software packages on separate computers hardwired together.
The issue i am having right away is, on the client&server how do you specify what port/adapter is going to be sending the packets if you have multiple?
I want to be just doing pure UDP broadcast packets(255.255.255.255) as its a point to point connection and setting up IP addresses every time would be too much of a hassle for reasons i wont go into.
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Member 2598478 wrote: setting up IP addresses every time would be too much of a hassle for reasons i wont go into.
Well if you use the IP address of the target machine the network layer will automatically use the adapter that links the machine with that IP address.
It's time for a new signature.
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Sending a UDP package to the universal broadcast address 255.255.255.255 should work on all network interfaces... at least on Windows. Broadcasting is only guaranteed to work within the LAN, in case you have a bigger (company) LAN the broadcast could be limited to your network segment. UDP is commonly used for service discovery in the LAN, once peers have found each other you can switch to another protocol, because UDP is not the most reliable transport available.
Give it a try! 
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Thanks for the replies.
When you say it should work on all network interfaces, when i open a socket how do i know which adapter/port it will do it on? Im assuming it wont broadcast it on all ports, or will it?
The issue comes in is this...
The testing machine would be on two networks, the corporate and then this "link" to the other machine under test(neither of which have an IP address assigned on that link).
I absolutely can not be sending broadcast packets across the corporate network, it must go over the other port im just confused looking at the inputs for the Winsock functions how you would specify which port to use if there was no IP address on either end.
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Hi,
I would like to create something similar to the Windows Media Player miniplayer in the task bar. I don't expect many problems with coding the desk band (plenty of documentation about that), but I'm still wondering how to start with coding the skinned UI.
When looking into Windows Media Player's resources, I have found the following images: http://img130.imageshack.us/img130/5195/wmpbandimages.png[^]
The first image is obviously a mask, and then there are images for normal, disabled, hottracked and pressed states. I guess that I should take the different parts of the 'state' images (according to the state of each part), and merge these into a single image that shows the current UI. But how can I do this?
I would prefer not to use any libraries, just C++ and the plain Windows API.
Thanks.
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Here[^] is a really good tutorial that should help you.
It's time for a new signature.
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Thanks for the link, but that tutorial only shows how to create non-rectangular windows with a bitmap background. I don't need a non-rectangular window, but a normal window with non-rectangular buttons on it, by using a colored mask (the top image in http://img130.imageshack.us/img130/5195/wmpbandimages.png[^]).
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