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actually i want to use functions of my DVR card
the link u suggested is an application
i dnt need code
i need articles which explains how to display video in VisualC++
i want to knw the steps nd functions which i shld include in my code for dispplaying video
looking 4 reply...........
NT
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#include<iostream>
#include<string>
#include<cmath>
using namespace std;
class Complex{
public:
Complex();
Complex(double);
Complex(double,double);
void write() const ;
bool operator==(const Complex& ) const ;
bool operator!=(const Complex& ) const ;
Complex operator-();
friend ostream& operator<<(ostream& out,Complex& c);
private:
double real;
double imag;
};
Complex::Complex(){
real=imag=0.0;
}
Complex::Complex(double re){
real=re;
imag=0.0;
}
Complex::Complex(double re,double im){
real=re;
imag=im;
}
void Complex::write() const {
cout<<real<<"+"<<imag<<'i'<<endl;
}
bool Complex::operator==(const Complex& u ) const {
if(real==u.real&&imag==u.imag)
return true;
else return false;
}
bool Complex::operator!=(const Complex& u ) const {
if(real!=u.real||imag!=u.imag)
return true;
else return false;
}
Complex Complex::operator-(){
real=-real;
imag=-imag;
}
ostream& operator<<(ostream& out,const Complex& c)
{
return out<<c.real<<"+"<<c.imag<<'i'<<endl;
}
int main(){
Complex c1(2.3,5.6);
Complex c2(1.4,2.5);
if(c1==c2) {
c1.write();
c2.write();
cout<<c1<<endl;
cout<<c2<<endl;
}
return 0;
}
I have declared :friend ostream& operator<<(ostream& out,Complex& c);
but why the error says:
cannot access private member declared in class 'Complex'?
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Hi,
Your function declaration has different prototype,
one has const reference other is not const.
Best Regards
Raj
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But after I modified the declaration of the function to const,there are two errors which says that operator<< is ambiguous added ~
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It should work. What's the concrete message of the error?
--
=====
Arman
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No, It should work for the << operator
but shows error for
Complex Complex::operator-(){<br />
real=-real;<br />
imag=-imag;<br />
}<br />
because it doesnot return value.
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NO~~~after I delete the funtion Complex::operator-() from the class,the error is the same as before~~~
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Hi,
I simply copied your code and put in an empty project I compiles well would you post the exact error message
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there are four:
error C2248: 'real' : cannot access private member declared in
class 'Complex'
error C2248: 'imag' : cannot access private member declared in
class 'Complex'
error C2593: 'operator <<' is ambiguous
error C2593: 'operator <<' is ambiguous
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By the way,the two previous errors point to the location
"return out<
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Because-because-because you have two different operator << overloads;
friend ostream& operator<<(ostream& out, Complex& c);
ostream& operator<<(ostream& out, const Complex& c)
{
...
}
Their prototypes are different due to the difference inside their parameter list;
in first case; Complex &
in second case; const Complex &
So make them the same; put const in the friend declaration.
--
=====
Arman
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NO~no~no~~I have modified this problem~~but it do noting to the error~
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Chen-XuNuo wrote: I have modified this problem...
To what? By making both the declaration and the definition the same, the compiler error (C2248) will go away.
"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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What is the size of windows message queue ? i.e how many messages can queue up before the next one being discarded?
And how long can a message stay in the message queue waiting to be processed?
I've been looking all over but haven't found an answer for this ?
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On Windows 2000 message queues defaulted to about 5000 entries which will be there until they get processed, however long it takes. I would guess that the sizes have gone up in XP and Vista and the implementation may have changed. If these limits are causing you problems then may I venture to suggest that you may have deeper problems in your design 
Nothing is exactly what it seems but everything with seems can be unpicked.
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thanks a lot,
i was wondering about this just for the sake of curiousity. it's really dangerous using a queue without knowing how much it can handle. it's wierd I couldn't found any information about this (which I thing is very important). now i'm so relieved  , nobody says a word about it because it's almost limitless
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GameProfessor wrote: it's really dangerous using a queue without knowing how much it can handle
It's also dangerous to make assumptions about the size of the windows message queue.
It's probably best to process the messages ASAP - for your sake and the user's sake 
Mark
"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder
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 I am attempt to make my software multilingual.In my application I have used CColorDialog. Now I didn't know how to translate these Common Dialog (CColorDialog / CFindReplaceDialog / CFontDialog / CPrintDialog / CPrintDialogEx) into all kinds of language version.
-- modified at 3:44 Monday 4th June, 2007
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my exe will modify a file, but just only the account which is created by IT dept. of my co. can do that, how can i run the exe with that account while the login account is another?
Thanks!!!
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use runas command .. u can shellexecute runas from your program.
if u want more help type just runas in command prompt window.
If u can Dream... U can do it
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if use "runas", i must input password when system prompt.
But all is transparent to operator , because operator just use my programme to modify files in one computer of domain and he dose`t konw where the file is!
So i must embed the username and password of the domain account created in server in my code!!!
-- modified at 4:39 Monday 4th June, 2007
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if you know the user name and password, you can use the CreateProcessWithLogonW() function.
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You might also want to look into LogonUser() and ImpersonateUser().
"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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MSDN: "You cannot use LogonUser to log on to a remote computer."
The file i want to modify is in a Server!!!
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