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Hi..
I am creating vc.net 2003 setup project. Before installation I need to check the presence of another software package say pgmA( previously installed ) and install my package pgmB in the same place as pgmA. How should I accompilish this?? Please help.
Thanks a lot in advance.
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Hi all-
I posted before about this but hopefully this is more clear. I'm getting an access violation deep within the wininet dll when InternetErrorDlg() is called to handle a 407 Proxy Authentication Required error.
The odd thing is that this only happens with an SSL connection.... non-SSL works perfectly.
Any ideas??????
My other post is here.
Thanks, Nicholas
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ive been having trouble with pointers in this program. just been learning about them and putting it into practice. ive commented in the code below where im getting the error, im getting a syntax error for where i thought i could use the pointer as i could if i were using what i am pointing to, strange im getting that error . the program is supposed to read the coeffients and signs of three variables to solve a quatratic equation. im trying to read the variables onto a stack then have the results output, by using recurssion twice. would really appreciate your help
#include <iostream>
#include <iomanip>
#include <conio.h>
#include <string>
#include <math.h>
#include "console.h"
using namespace std;
bool quadrt( float, float, float, float*, float* );
void quadr( void );
void quadrr( void );
static float r, x, y, z, x1, x2, *co;
char s, j, k, l;
int p = 9, m = 0, n = 0, i;
string header = "*** Quadratic equations ***\n\n",
line( 30, '-' );
void quadEquation()
{
cout << header << line << "\nEnter enter coefficients a, b, c with signs\n" << endl;
quadrr();
getch();
return;
}
void quadrr( void )
{
m++;
co = &x;
for( i = 1; i <= 3; i++ )
{
do
cin >> *co;
while
*co == false; // if input is not a valid floating point number
// error C2059: syntax error : '*'
if( -*co >= 0 ) // if input is negative
s = '-';
else
s = '+';
switch( i )
{
case 1: co = &y; // point to y address
j = s;
break;
case 2: co = &z;
k = s;
break;
case 3: l = s;
break;
}
}
switch( getch() )
{
case 27: goto end;
default: break;
}
if( m == 1 )
cout << "Quadratic Equations Solutions\n" << line << endl << endl;
quadrr();
end:
quadr();
}
void quadr( void )
{
n++;
if( x != 0 )
cout << j << ' ' << x << "x^2 ";
if( y != 0 )
cout << k << ' ' << y << "x ";
if( z != 0 )
cout << l << ' ' << z;
cout << " = 0 ";
p += 1;
setCursor( p, 30 );
if( quadrt( x, y, z, &x1, &x2 ) )
cout << "x1 = " << x1 << ',' << " x2 = " << x2 << endl;
else
cout << "no solution exists" << endl;
if( n == m ) return;
quadr();
}
bool quadrt( float a, float b, float c, float *n1, float *n2 )
{
r = ( b * b - 4 * a * c );
if( r >= 0 )
{
*n1 = ( -b + sqrt(r) ) / ( 2 * a );
*n2 = ( -b - sqrt(r) ) / ( 2 * a );
return true;
}
else return false;
}
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gyrvwrzp wrote:
cin >> *co;
This will not work as co has not been allocated any memory. You either need to not use a pointer or you will need to allocate a block of memory using the new operator. The former is preferable.
gyrvwrzp wrote:
while
Where's the condition?
gyrvwrzp wrote:
*co == false; // if input is not a valid floating point number
The co variable is a float pointer. This statement does not do anything useful. It is comparing the contents of co to a bool value. What exactly is the purpose of the co variable?
"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
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I have given an assignment in my university to make a shoping cart in the c#
So please help me making the assignment
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You might try posting in the C# forum.. This forum is for Visual C++
Whoever said nothing's impossible never tried slamming a revolving door!
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I want to put each bit of an image into each pixel of another image. how do i take each bit of an image to do that?
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i'm writting an Activex control. i have CDialogBar attached to it.
There uis a listbox in the CDialogBar.
i tried to add a string to CList box. But it gives an Runtime error. I used the Folllowing code.
CListBox *listBox=(CListBox *)GetDlgItem(IDC_LIST1);
listBox->AddString(L"Hai");
i think listbox pointer not asigned to point the list box.
Please help me.
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Can anybody let me know how to display a tree view in an MDI Application.So that I can synchronize each node in the tree to the MDI Child in the application.
laiju
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...these were excellent tools and I can't seem to find them (nor mention of them in the discussion boards). Am I just going senile - or have these disappeared?
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It seems to be referenced in this Wrox book "Visual C++ 4 Master Class" which I have at home. I'll take a look and will get back to you. There's also a reference to it in this[^] CP article, but you've probably already seen that.
/ravi
My new year's resolution: 2048 x 1536
Home | Articles | Freeware | Music
ravib@ravib.com
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I fired up google and found the CP article. However, I downloaded the code and I didn't see it in there.
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Hi everyone,
I need the Sourcecode(best MFC) for an Audio Spectrum Analyzer. I found Audacity at Sourceforge but I don't get through the Code. It's a kind of difficult because they use some stuff wxWindows and so on. I really need some of SourceCode, which is understandable.
Greeting
RedDragon2k
Unix and C are the ultimate computer viruses.
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Does anybody know a tool for automaic generation of database layers for C++ with Microsoft SQL Server and MSDE.
I found a lot of tools for C# and VB.NET, but a special tool for C++ I could not found. Does anybody of you have experiences with such tools, and can tell me, which one is easy to use and can maintain structural changes in the database with following generation of new layer files.
Thank you for any help.
Roman
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I reinstalled Windows XP (to basically clean the crap off of it I accumulated for a year) and I tried to run my app I'm developing but I still get that runtime error in the function CWnd::DefWindowProc in the file wincore.cpp. There are two calls to ::CallWindowProc, and the one called is decided on if m_pfnSuper is null or not. Sometimes one is called, and sometimes the other is. At any rate, the program still crashes. The line it's crashing on at the moment is running now is:
if (m_pfnSuper != NULL)<br />
return ::CallWindowProc(m_pfnSuper, m_hWnd, nMsg, wParam, lParam);
And here are the values of those variables:
m_pfnSuper: 0xffff02d3
m_hWnd: 0x00010420
nMsg: 2
wParam: 0
lParam: 0
And those look valid to me. The real crash still happens deep within .dll calls that I don't have the source code for but that's as far as the rabbit-hole goes for me, so-to-speak. I'd love to get this gorilla off my back. (using weird analogies in honor of Dan Rather)
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m_pfnSuper looks pretty weird to me: it's pointing into kernel space. Of course, this value may have a special meaning for ::CallWindowProc.
I'd stick a data breakpoint on m_pfnSuper and see where its value is being changed. See Setting Breakpoints When Values Change or Become True[^].
Stability. What an interesting concept. -- Chris Maunder
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I'm working on that now, but in the meantime, I should add that if the app starts and I immediately close it, there's no error but once I do anything in the app, it crashes like I described every time when I go to close the app.
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I added the breakpoint as described and it never is triggered, however, I still get the same runtime error, so either it's not setup right (which is possible but the procedure is simple so it shouldn't be) or it's never changed. Another thing is if I use the close button in the top-right, it closes fine but I've always closed with File->Exit, and that function simply calls exit(0); and then crashes.
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LighthouseJ wrote:
nMsg: 2
Messages 0 through 1023 are reserved by the system so it seems weird that nMsg would be 2. Make sure you are not doing something like SendMessage(IDCANCEL) to close the window. I have seen people make that mistake before.
"You're obviously a superstar." - Christian Graus about me - 12 Feb '03
"Obviously ??? You're definitely a superstar!!!" mYkel - 21 Jun '04
Within you lies the power for good - Use it!
Honoured as one of The Most Helpful Members of 2004
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Nope, when the user goes to File->Exit, the function called by the menu click just runs exit(0);
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LighthouseJ wrote:
runs exit(0);
Try using PostQuitMessage(); instead.
"You're obviously a superstar." - Christian Graus about me - 12 Feb '03
"Obviously ??? You're definitely a superstar!!!" mYkel - 21 Jun '04
Within you lies the power for good - Use it!
Honoured as one of The Most Helpful Members of 2004
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wow, if only my other problems left to resolve quit as easily as that one did, good call. Now I don't have to click through any more runtime errors that always occur but I used to not know how to do anything about it. Thanks alot.
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Call PostMessage(WM_CLOSE) instead. PostQuitMessage() does not shut down an application properly as other messages might be initiated by the shutdown operation and those messages, along with any other messages that might be in the queue, will not be processed.
"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
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