C / C++ / MFC

Why the application could not run at Windows XP?

7-Jan-06 23:01

dynamic_cast can be used for better safety.

-Prakash

rushing7-Jan-06 18:22

rushing

7-Jan-06 18:22

The applicaiton is ok in Windows 2000.
When run in Windows Xp ,at the beginning there is a error which said the memory could not be visited.
I link WS2_32.LIB in the project.
Why?
Thanks!

Re: Why the application could not run at Windows XP?

Prakash Nadar7-Jan-06 22:44

GDI+ Visual C++ wrapper class operators missing?

7-Jan-06 22:44

rushing wrote:
The applicaiton is ok in Windows 2000.

Is it your application?
Is it memory exeception? if it is written by you can u identify the code from where the memory exception is raised?

-Prakash

bob169727-Jan-06 16:03

bob16972

7-Jan-06 16:03

I just realized the Point class does not provide the = operator. Now that I'm trying to actually use GDI+ in my apps, I'm finding the classes for Rect, RectF, Point, and PointF to be rather peculiar in design.

Also, Rect doesn't provide functions that return the endpoints.

I can't create an Array of Point and copy another Point into one of it's elements (unless it's during initialization). Instead, I have to resort to assigning the X and Y members explicitly into each array element.

I'm not sure if there is some bigger picture I'm missing here or some new highly ultra OOP paradigm I missed the whitepaper on or if this design is just weak and missing some of the useful operators that MFC provided on many of it's classes.

Does anyone have any insight concerning these omissions in some of the more basic classes like Point and Rect? My code just looks rather bloated copying the members individually like this so I thought maybe I'm doing it wrong.

Thanks in advance for any guidance.

-- modified at 21:59 Saturday 7th January, 2006

ask one question in VC .NET

Pierre,Hsieh7-Jan-06 14:51

Pierre,Hsieh

7-Jan-06 14:51

I want to build a win32 console program in VC .Net. I wrote one function in random1.h and random1.cpp, Then, I wrote my main program in SimMCMain.cpp which call this function from random1.h and random1.cpp. It's no problem in VC++ 6.0, but it always has problem when linking in VC.Net. Can anyone give me some suggestion? Thanks

****random1.h***
#ifndef RANDOM1_H
#define RANDOM1_H

double GetOneGaussianBySummation();
double GetOneGaussianByBoxMuller();

#endif

****random1.cpp****
#include <cstdlib>
#include <cmath>

// the basic math functions should be in namespace
// std but aren't in VCPP6
#if !defined(_MSC_VER)
using namespace std;
#endif

double GetOneGaussianBySummation()
{
double result=0;

for (unsigned long j=0; j < 12; j++)
result += rand()/static_cast<double>(RAND_MAX);

result -= 6.0;

return result;
}

double GetOneGaussianByBoxMuller()
{
double result;

double x;
double y;

double sizeSquared;
do
{
x = 2.0*rand()/static_cast<double>(RAND_MAX)-1;
y = 2.0*rand()/static_cast<double>(RAND_MAX)-1;
sizeSquared = x*x + y*y;
}
while
( sizeSquared >= 1.0);

result = x*sqrt(-2*log(sizeSquared)/sizeSquared);

return result;
}

****SimMCMain.cpp ****
// requires Random1.cpp
#include <Random1.h>
#include <iostream>
#include <cmath>
using namespace std;

double SimpleMonteCarlo1(double Expiry,
double Strike,
double Spot,
double Vol,
double r,
unsigned long NumberOfPaths)
{
double variance = Vol*Vol*Expiry;
double rootVariance = sqrt(variance);
double itoCorrection = -0.5*variance;

double movedSpot = Spot*exp(r*Expiry +itoCorrection);
double thisSpot;
double runningSum=0;

for (unsigned long i=0; i < NumberOfPaths; i++)
{
double thisGaussian = GetOneGaussianByBoxMuller();
thisSpot = movedSpot*exp( rootVariance*thisGaussian);
double thisPayoff = thisSpot - Strike;
thisPayoff = thisPayoff >0 ? thisPayoff : 0;
runningSum += thisPayoff;
}

double mean = runningSum / NumberOfPaths;
mean *= exp(-r*Expiry);
return mean;
}

int main()
{
double Expiry;
double Strike;
double Spot;
double Vol;
double r;
unsigned long NumberOfPaths;

cout << "\nEnter expiry\n";
cin >> Expiry;

cout << "\nEnter strike\n";
cin >> Strike;

cout << "\nEnter spot\n";
cin >> Spot;

cout << "\nEnter vol\n";
cin >> Vol;

cout << "\nr\n";
cin >> r;

cout << "\nNumber of paths\n";
cin >> NumberOfPaths;

double result = SimpleMonteCarlo1(Expiry,
Strike,
Spot,
Vol,
r,
NumberOfPaths);

cout <<"the price is " << result << "\n";

double tmp;
cin >> tmp;

return 0;
}

PJ Arends7-Jan-06 15:02

PJ Arends

7-Jan-06 15:02

Pierre,Hsieh wrote:
but it always has problem when linking in VC.Net.

"You're obviously a superstar." - Christian Graus about me - 12 Feb '03

"Obviously ??? You're definitely a superstar!!!" - mYkel - 21 Jun '04

"There's not enough blatant self-congratulatory backslapping in the world today..." - HumblePie - 21 Jun '05

Within you lies the power for good - Use it!

Pierre,Hsieh7-Jan-06 15:14

Pierre,Hsieh

7-Jan-06 15:14

SimpleMCMain1 error LNK2019 and
SimpleMCMain1 fatal error LNK1120

PJ Arends7-Jan-06 15:44

PJ Arends

7-Jan-06 15:44

You really should supply more relevant information if you want useful help in solving your problem. Most people do not like playing "twenty questions" just to get enough information to help.

When the linker generates LNK2019 it gives you more info, what is the information given?

Pierre,Hsieh7-Jan-06 16:03

Pierre,Hsieh

7-Jan-06 16:03

Sorry, Because my system is chinese version and this is my first time to ask question in web site, that's why I didn't provide more information. I checked this error message from MSDN web site.

LNK2019 : unresolved external symbol 'symbol' referenced in function 'function'
SimpleMCMain1 error LNK2019: 無法在外部之程式庫中找到或連結所需之資料型別或函式的符號 _main，於函式 _mainCRTStartup 中參考

LNK1120 : number unresolved externals
SimpleMCMain1 fatal error LNK1120: 1 個無法在外部程式庫中找到或連結所需之資料型別或函式

Still learning how to code

David Crow7-Jan-06 18:15

David Crow

7-Jan-06 18:15

What is SimpleMCMain1? It's not shown anywhere in your code.

Are you creating a CRT application? The LNK2019 linker error might be resolved by changing "Minimize CRT Use in ATL" to "No". Go to Project Properties / Configuration Properties / General. Does that help?

"The words of God are not like the oak leaf which dies and falls to the earth, but like the pine tree which stays green forever." - Native American Proverb

Simulating mouse clicks

Still learning how to code7-Jan-06 12:46

7-Jan-06 12:46

The application that I am currently developing is attempting to programmatically control an external application by simulating mouse clicks in it's various windows. I have managed to produce the context menu on the external application by simulating a RH mouse click (using PostMessage's with WM_RBUTTONDOWN / WM_RBUTTONUP). I can also execute an item on the popup menu by positioning the cursor and simulating a LH mouse click (using PostMessage's with WM_LBUTTONDOWN / WM_LBUTTONUP). This all works as expected if there is no other code following it (i.e. my app exits) or there is an AfxMessageBox separating this code and further mouse-click simulations. The failure is that execution of the popup menu item doesn't result in a new window. I get the feeling that the external app is not getting 'time' to receive/react to the simulated clicks until my app exits (Presumably, the AfxMessageBox must also have the same effect - yes ?). I have tried Sleep(10000) after the context menu operation, but this doesn't seem to help. Do I need to (somehow) inform the system that my app doesn't need the remainder of it's current timeslot, thus giving the external app time to "do its stuff". If so, how do I do that ?

Doug

vipinasda7-Jan-06 13:04

vipinasda

7-Jan-06 13:04

Does the blocking SendMessage(...) instead og PostMessage help?

Vipin - MVP

Still learning how to code

Still learning how to code7-Jan-06 22:15

7-Jan-06 22:15

Tried SendMessage originally, and couldn't even get the initial stages to work. I have currently got this stuff implemented in InitDialog() of a dialog-based app - and I was in error in my original posting when I said that it only worked when my app exited - I should have said that it only worked once the DoModal() had executed. Is this a clue ?? Confused | :confused:

Doug

#realJSOP8-Jan-06 4:00

#realJSOP

8-Jan-06 4:00

Assuming you can get the process handle (if your app launched the other app with ::CreateProcess(), for instance), after posting the mouseclick message, try using ::WaitForInputIdle(processHandle, timetowait) like so:

bool bIdle = false;
DWORD dwWaitResult;
// wait for five seconds
dwWaitResult = ::WaitForInputIdle(hProcess, 5000);

switch (dwWaitResult)
{
    case 0 :
        {
            // success!
            bIdle = true;
        }
        break;
    case WAIT_TIMEOUT :
        {
            AfxMessageBox("Timed out waiting for idle state.");
        }
        break;
    case WAIT_FAILED :
        {
            // use ::GetLastError() to find error
        }
        break;
}

------- sig starts

"I've heard some drivers saying, 'We're going too fast here...'. If you're not here to race, go the hell home - don't come here and grumble about going too fast. Why don't you tie a kerosene rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt

"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001

-- modified at 9:00 Sunday 8th January, 2006

Still learning how to code

Still learning how to code8-Jan-06 6:41

8-Jan-06 6:41

Hi John and VIP ! Thanks for your input - in the meantime, I seem to have solved the (current !) problem - putting my code in InitDialog() seems to be the wrong place. Thinking about it, I suspect that the message loop (pump) is not activated until window initialisation has been completed. I've moved my code into InitInstance() (and actually removed the main window dialog and DoModal() as I currently don't need it !) and everything now works !!! Thanks again ! Perhaps someone can confirm my suspicions about the message loop and InitDialog() - might help someone else in the future ! Big Grin | :-D

Doug

Re: How to add an ActiveX control in another ActiveX control?

Stephen Hewitt9-Jan-06 12:47

Stephen Hewitt

9-Jan-06 12:47

See
On SendInput API in "The Old New Thing"

In short:
The SendInput is the API to use to fake user input (although in most cases PostMessage works fine).

Steve

[Message Deleted]

S.C.Wong7-Jan-06 7:08

S.C.Wong

7-Jan-06 7:08

[Message Deleted]

Prakash Nadar7-Jan-06 19:05

how to pass a class ,object to a function by using pointers?

7-Jan-06 19:05

You need to make composite activex control.

-Prakash

neodeaths7-Jan-06 5:32

neodeaths

7-Jan-06 5:32

i am previously ask this question before but i have relise taht my previous question was not easy to understand. Dead | X|

can any one please teach me how i can pass a object to a function using pointers?

this is normally how i pass a normal variable to a function using a pointer:

<br />
void function(int* ptr)<br />
int main()<br />
{<br />
int num1;<br />
function(&num1);<br />
<br />
return 0;<br />
}<br />

wat i wanan do now is something like this:

<br />
class theclass<br />
{<br />
public:<br />
<br />
}<br />
void function(theclass* ptr)<br />
<br />
int main()<br />
{<br />
theclass tc;<br />
function(&tc);<br />
<br />
return 0;<br />
}<br />

so what i am trying to do is replacing the int with the object but it have error so could any one please teach me how to do this??

i will greatly appreciated it Rose | [Rose]

Re: how to pass a class ,object to a function by using pointers?

Prakash Nadar7-Jan-06 5:46

Re: how to pass a class ,object to a function by using pointers?

7-Jan-06 5:46

What is the error that you are getting ?

-Prakash

neodeaths7-Jan-06 5:56

neodeaths

7-Jan-06 5:56

this is part of my actual code:

<br />
void add_new_item(grahpic_card* gc_add);<br />
<br />
int main()<br />
{<br />
graphic_card gc;<br />
add_new_item(&gc);<br />
}<br />

:\Documents and Settings\nick\Desktop\lalabear project\newporject.cpp(128) : error C2065: 'grahpic_card' : undeclared identifier
C:\Documents and Settings\nick\Desktop\lalabear project\newporject.cpp(128) : error C2065: 'gc_add' : undeclared identifier
C:\Documents and Settings\nick\Desktop\lalabear project\newporject.cpp(128) : error C2182: 'add_new_item' : illegal use of type 'void'
C:\Documents and Settings\nick\Desktop\lalabear project\newporject.cpp(160) : error C2064: term does not evaluate to a function
C:\Documents and Settings\nick\Desktop\lalabear project\newporject.cpp(181) : error C2448: '<unknown>' : function-style initializer appears to be a function definition

Re: how to pass a class ,object to a function by using pointers?

Prakash Nadar7-Jan-06 6:09