|
All headers needed by all .cpp files go both to the stdafx and the file. This way, I can both improve code reuse and compiling speed.
"In an organization, each person rises to the level of his own incompetence." Peter's Principle
|
|
|
|
|
In the stdafx.h I usually put,
My own set of library include files
include files that will need to be used across multiple source files
Header files that don't change very often.
Michael
"I've died for a living in the movies and tv.
But the hardest thing I'll ever do is watch my leading ladies,
Kiss some other guy while I'm bandaging my knee."
-- The Unknown Stuntman
|
|
|
|
|
In java, I can do something like this:
Object o=GetSomeObject();
if(o instanceof MyObject)
...
else
... where MyObject is an Object-derived class.
What's the c++ equivalent for this?
using: [VISUAL STUDIO 6.0] [WIN98/2]
|
|
|
|
|
If your compiler has RTTI, you can use dynamic_cast, typeid and type_info.
VC does, if you have RTTI enabled.
"In an organization, each person rises to the level of his own incompetence." Peter's Principle
|
|
|
|
|
Is there an API function to query the available com ports on the system.
Thanks
|
|
|
|
|
I don't think so. I usually check the registry like so:
set<CString> Ports;
HKEY hSerialComm=0;
RegOpenKeyEx(HKEY_LOCAL_MACHINE,"HARDWARE\\DEVICEMAP\\SERIALCOMM",0,KEY_READ,&hSerialComm)==ERROR_SUCCESS||(hSerialComm=0);
DWORD nValues,nLongestName,nLargestValue;
if (hSerialComm && ::RegQueryInfoKey(hSerialComm,0,0,0,0,0,0,&nValues,&nLongestName,&nLargestValue,0,0)==ERROR_SUCCESS && nValues && nLongestName && nLargestValue)
{
CString _Name,_Value;
char* Name=_Name.GetBuffer(nLongestName+1);
char* Value=_Value.GetBuffer(nLargestValue+1);
DWORD NameLen,ValueLen,Type;
for (int i=0;nValues;++i)
{
NameLen=nLongestName+1;
ValueLen=nLargestValue+1;
LONG Result=::RegEnumValue(hSerialComm,i,Name,&NameLen,0,&Type,(BYTE*)Value,&ValueLen);
if (Result==ERROR_NO_MORE_ITEMS)
break;
else if (Result!=ERROR_SUCCESS)
{
break;
}
else
{
--nValues;
if (Ports.find(Value)==Ports.end())
Ports.insert(Value);
}
}
_Name.ReleaseBuffer(0);
_Value.ReleaseBuffer(0);
}
if (hSerialComm)
RegCloseKey(hSerialComm);
Additionally, I will simply just try to open the first few
ports by typical name. (e.g. COM1 ... COM8)
|
|
|
|
|
Hi, all...
==========
Can anyone write a function that returns a list of explorer HWNDs ??
for example:
I have 4 winodows running ....
1- "my computer" (HWND= 0x00AA)
2- "c:\folder1\folder2\" (HWND= 0x00BB)
3- app1 (HWND= 0x00CC)
4- app2 (HWND= 0x00DD)
How can I scan all the HWNDs and identify
explorer windows (HWNDs: 0x00AA & 0x00BB in the example)???
 Thanks in advance
|
|
|
|
|
You can enumerate all toplevel windows with EnumWindows and check window class with a call to GetClassName for each HWND you get. You'd have to check Explorer windows class name in Spy++. I'm not sure this name remains unchanged between Win9x/NT/2K/XP.
Your other option is searching for process started by explorer.exe, getting its PID and checking the PID for each HWND with GetWindowThreadProcessId. The problem with this approach is that there's no single process enumeration API working across all 32 bit Windows platforms.
Tomasz Sowinski -- http://www.shooltz.com
*** Si fractum non sit, noli id reficere. ***
|
|
|
|
|
This is the code I used in one of my apps:
EnumWindows(IEEnumProc, 0);
and the enum proc:
BOOL CALLBACK IEEnumProc(HWND hWnd, LPARAM lParam)
{
char szClass[256];
GetClassName(hWnd,szClass,256);
if(strcmp(szClass,"IEFrame") == 0)
{
}
return TRUE;
}
regards
Greg
modified 12-Sep-18 21:01pm.
|
|
|
|
|
But he's after Windows Explorer, not IE. Class name is 'CabinetWClass', at least on my XP box.
Tomasz Sowinski -- http://www.shooltz.com
*** Si fractum non sit, noli id reficere. ***
|
|
|
|
|
yes, you're right. It must be CabinetWClass instead of IEFrame.
I thought he wants to find IE windows, not explorer windows 
modified 12-Sep-18 21:01pm.
|
|
|
|
|
Gregor S. wrote:
I thought he wants to find IE windows, not explorer windows
Confess, you are fixed on IE 
...if you're under 8 or younger. Chris Maunder, the Lounge
|
|
|
|
|
I'm using Mozilla 
modified 12-Sep-18 21:01pm.
|
|
|
|
|
Explorer also uses 'ExploreWClass' as a class name when it displays the folder tree by default.
people are not very wise / don't know their limitations /
don't know what death means / when they play their dirty games
'Killing Fields' Funker Vogt
|
|
|
|
|
|
i am writing an adventure in vc++6. the problem is, ive include a .ini file, with the possible words that a user could enter. when the user enters a command in the game (at the prompt) the program "scans" this file to see if any words match. the problem lies with the [ ] 's in the .ini file
e.g
[nouns]
1 chair
2 school
etc
so i have used the continue statement to "skip" the headings ([nouns] and so on) the prolem with this is when a user types in a "known" command, the program outputs "Do not recognise command" (its set to do this if the words input arent in the .ini file)
any ideas?
Sas
|
|
|
|
|
Post your code; you have a bug. Just show us the loop that processes comands. remember to wrap the code in <PRE> ... </PRE> tags please.
Signature space for rent. Apply by email to....
|
|
|
|
|
I recomand using
http://www.codeproject.com/cpp/ciniex.asp
or http://www.codeproject.com/cpp/ciniex.asp for ini file acess.
But ur method should work, probably a bug!
Papa
while (TRUE)
Papa.WillLove ( Bebe ) ;
|
|
|
|
|
You should use the GetPrivateProfile* API functions for reading INIs.
"In an organization, each person rises to the level of his own incompetence." Peter's Principle
|
|
|
|
|
I strongly suggest prereading the INI file and putting the words into a CMap.
|
|
|
|
|
Another question about inheritance on operators (such as =):
does it have to apply two object of the same type/class exactly OR can I assign (i.e. '=') an object to another of a sibling class?
Example:
class Base
{
public:
Base& operator = (Base&);
};
class DerivedA
{
public:
DerivedA& operator = (DerivedA&);
};
class DerivedB
{
public:
DerivedB& operator = (DerivedB&);
};
Can I do something like:
DerivedA a;
DerivedB b;
a = b;
? 
The reason I m asking is because, I may "exchange" some data fields of object "a" with some of object "b" (actually the data fields shared in Base class!)
Thanks again,
bertrand
|
|
|
|
|
You'd have to provide the following in DerivedA:
DerivedA& operator=(const DerivedB &);
BTW: use const references for arguments of operator =. The right-hand-side object doesn't change when you assign its value.
Also, remember that '=' token (not operator= member function) is used when creating object:
DerivedB b;
DerivedA a = b;
In the case above, the constructor accepting 'const DerivedB&' would be used.
Tomasz Sowinski -- http://www.shooltz.com
*** Si fractum non sit, noli id reficere. ***
|
|
|
|
|
Curious as to why you wont use :
Base* a = new DerivedA
Base* b = new DerivedB.
If the data is defined in base (which it should be) then *a = *b should work. Correct me if I am wrong.  (its been so long since i have written any real code....sigh!!!!)
|
|
|
|
|
Ranjan Banerji wrote:
If the data is defined in base (which it should be)
I find this statement strange. Why would you limit yourself in such way? Often it's the other way round - you define base class as abstract interface (all pure virtual functions, no data members) and provide implementation in derived class[es].
Tomasz Sowinski -- http://www.shooltz.com
*** Si fractum non sit, noli id reficere. ***
|
|
|
|
|
I agree with you completely. I did not intend to impose such a limitation. However, I do prefer data to be at a lower level (closer to base) class rather than a derived class at the end of the hierarchy. So as much as a base class provides the interface I also like it to provide data. Of course this can vary depending on the design requirements.
If each derived class has its own data defined then to a large extent we loose the benefits of inheritance. Now one may argue that a certain design requires a base class for interface only and not data and that is fine too.
Now if you look at the example provided in this dicussion we were talking about creating an operator= for Derived A and B. If the contents of B are to be assigned to A then I suppose it was fair on my part to assume that they both contain the same data and therefore I would hope that the data was defined in Base.
|
|
|
|
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
