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hum, i'd like to answer, even if you already have the solution...
C:\*\ClientDlg.cpp(179) : error C2065: 'CButton01Dlg' : undeclared identifier
C:\*\ClientDlg.cpp(179) : error C2146: syntax error : missing ';' before identifier 'dlg'
C:\*\ClientDlg.cpp(179) : error C2065: 'dlg' : undeclared identifier
C:\*\ClientDlg.cpp(180) : error C2228: left of '.DoModal' must have class/struct/union type
here is what the compiler says :
first error, undeclared identifier. what does this evoque for you ? for me (and the compiler too), it means that the identifier CButton01Dlg is called in a module (cpp file) but the definition of that identifier is not inside it. You so have to help it telling it that it will find such definition in Button01Dlg.h file (for example).
So, do this :
<font color=#0000FF>#include</font> <font color=#808080>"Button01Dlg.h"</font>
The 3 last error depend on the 1st one. As CButton01Dlg were not defined, the compiler could not do anything with it, so :
- could not declare dlg in a type it doesn't know (error C2065),
- could not use dlg (error C2228).
here it is. hope it will help a bit...
TOXCCT >>> GEII power
[toxcct][VisualCalc]
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Hello,
I'm a VC++ beginner. And things seem to be so hard to me...
I'm stuck with the problem of constructor. Here is my code
//file Point3D.h
....
CPoint3D: public CObject
{
public:
CPoint3D();//default constructor
CPoint3D(float X,float Y,float Z);//my constructor
.....
private:
float x;
float y;
float z;
}
//end of Point3D.h
//file Point3D.cpp
.....
CPoint3D::CPoint3D(){
x=0;
y=0;
z=0;
}
CPoint3D::CPoint3D(float X,float Y,float Z){
x=X;
y=Y;
z=Z;
}
....
//end of file Point3D.cpp
and when I delared an object of CPoint3D in class CPointDoc like the code following:
//file PointDoc.h
...
#include "Point3D.h"
CPointDoc: public CDocument
{
.....
public:
CPoint3D point(1,2,3);
.....
}
//end of file PointDoc.h
I received an error at the line:
CPoint3D point(1,2,3) in file PointDoc.h
like this: syntax error "const"
I've tried to figure out but I failed.
Please, help me over this problem!
Any help would be much appreciated!
Thanks in advance!
Grenouille
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You cannot initialize object inside class declaration. You should do it in costructor, i.e:
class CPointDoc: public CDocument
{
.....
public:
CPoint3D point;
.....
};
...
CPointDoc::CPointDoc ():point(CPoint3D(1,2,3))
{
}
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be careful to construct the base class object too :
CPoint3D::CPoint3D() : CObject() {
}
TOXCCT >>> GEII power
[toxcct][VisualCalc]
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nonsense. The base class constructor is called automatically before CPoint3D's constructors body is executed.
Cheers
Steen.
"To claim that computer games influence children is ridiculous. If Pacman had influenced children born in the 80'ies we would see a lot of youngsters running around in dark rooms eating pills while listening to monotonous music"
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Hello friends,
Please observe the program given below
#include <iostream.h>
class A
{
int a , b ;
public:
A();
A(int,int);
void show();
};
A::A()
{
a = 10;
b = 20;
}
A::A(int x1 , int x2)
{
x1 = a ;
x2 = b;
}
void A::show()
{
cout <<"the value of a" << a << endl;
cout <<"the value of b" << b << endl;
}
int main()
{
A obj1(11,20);
A obj2;
obj2.show();
cin.get();
return 0;
}
My question Can I call "show function" using the object "obj1".I tried to call the show function using the object obj1. I got junk values for a and b in return. Correct output is got when I call "show function" using the object obj2.
Why this is so ?
Please help.
Best Regards,
Phijo
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phijophlip wrote:
I tried to call the show function using the object obj1. I got junk values for a and b in return.
Of course you did. In the constructor A(int x1, int x3), you assign whatever value may be in your member variables into the parameters. Try switch the assignments
A::A(int x1 , int x2)
{
a = x1;
b = x2;
}
"After all it's just text at the end of the day. - Colin Davies
"For example, when a VB programmer comes to my house, they may say 'does your pool need cleaning, sir ?' " - Christian Graus
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Obj1 is constructed with the constructor that receives two parameters. If you look at this constructor:
A::A(int x1 , int x2)<br />
{<br />
x1 = a ;<br />
x2 = b;<br />
}<br />
I think you made a mistake here. You must not store a in x1 and b in x2 but the opposite !!! So it would become:
A::A(int x1 , int x2)<br />
{<br />
a = x1 ;<br />
b = x2;<br />
}<br />
And that's why you get junk vallues, because the variables a and b are never initialised.
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A::A(int x1 , int x2)
{
x1 = a ;
x2 = b;
}
definately u will get garbage values for a and b.as it doesnot assign values to a and b as previous constructor
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The solution to the problem has already been given, but I'd like to offer that you could have been warned by the compiler had you used the following instead:
A(const int,const int); Now any attempt to modify the parameters passed to the constructor would result in a compiler message.
"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 a handle to a bitmap image using Loadimage(...,LR_FROMFILE).. how do i use it to display the image in a custom static control that i have created by subclassing the static control using bitblt() function.Also i need to use the scrollbars if the image size is greater thn the size of the control... can anyone help!!
sanjay
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For painting the bitmap into your static, use
CPaintDC dc(this);
CDC MemDc;
CRect rcClient;
GetClientRect(&rcClient);
MemDc.CreateCompatibleDC(this->GetDC());
CBitmap* pMemBitmap = MemDc.SelectObject(&m_Bitmap);
if (pMemBitmap)
dc.BitBlt(0, 0, rcClient.right, rcClient.bottom, &MemDc, 0, 0, SRCCOPY);
MemDc.SelectObject(pMemBitmap);
Sorry cant help you with the scrollbar thing... hope this helps.
- tareq
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thanks tareq, i will try this out at night on my pc..
sanjay
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Hi all...
i want some exercises based on MS SQL northwind database for a training program..
can u pls send me any links / pdf /doc
very urgent..please help me...
Thanks in advance
renji
Ninety-eight percent of the thrill comes from knowing that the thing you designed works, and works almost the way you expected it would. If that happens, part of you is in that machine.
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A server program that I have to deal with is slightly old and is not getting any further upgrades. Problem is that if someone tries to login to it using %s, %i, etc... then it crashes and has to be restarted, I am sure you all can figure out why that is. I either need to make a small program to watch for the login packet and drop it when % is detected in the name, since they would not be their anyways. I already have the packet structure and it is uniform for all logins so it would be simple to just do a couple compares of the packet array to see if it needs to be dropped. Does anyone have any thoughts, code, etc for a simple way to achieve dropping a packet with specific data, preferably heading to a specific program?
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if you overload a function with "signed char" instead of just "char" and another with "signed int" then call it with 'c' as a parameter, the "signed int" one gets called, not the "signed char" one. Is this a bug in VC++, or is it supposed to work that way?
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AFAIK that is standard behaviour. The compiler treats the 'c' as an int. To get around this you have to cast the 'c' to an signed char.
MyFunction((signed char)'c');
"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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um... just putting "char" instead of "signed char" calls the "char" one (not the "int" one).
VC++ doesn't seem to treat 'c' as an int:
puts( typeid('c').name() ); // prints "char"
puts( typeid('cc').name() );// prints "int"
do the c++ standards say to? do you know if other compilers do?
-thanks
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The default char type may be unsigned.
This can be controlled by compiler flags.
In that case using 'char' and 'c' works because there is no conversion.
Using 'signed char' and 'c' makes the compiler look for the best conversion from (unsigned char) 'c'. In that case i guess it promotes 'c' to a signed int.
...cmk
Save the whales - collect the whole set
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I want to implement Process Communication in visual C. Like if a process is running, i want to write a code which can cause that process to stop or shutdown or a code which detect that a certain process has been start and it should be stopped.
Or can any one give me a good site on IPC to implement the idea above.
Thanks in advance
-oam
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Hi
First of all, call EnumProcess to get all the processes running in the system.
Then call OpenProcess to open the running proccess. You will have got a handle the required Process by now. Set the required access right while opening the process.
Now call TerminateProcess to terminate the process.
Hope this would work for you
Regards
The Best Relligion is Science.
Once you understand it, you will know God.
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I understand the first paragraph of your comment, but i don't understand if the program will send a message to the running process. I wanted something that will communicate with the running process in many ways.
oam
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Hi
Using of shared memory will of any use to you?
Regards
Shiraz
The Best Relligion is Science.
Once you understand it, you will know God.
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Hello,
I need to read in all text in a file, How can I do that?.
I need to read in all information direkt.
I have try this;
while(fgets(szLine, 256, filep));
But I only get the first text line.
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Unless I needed to read one line at a time, I would just:
1) Open file for read only.
2) Call _filelength to determine the amount of memory needed.
3) Allocate a buffer large enough to hold it.
4) Call fread, to read the entire text file into the buffer.
5) Close the file.
Now that I have it in a buffer I can do what ever I what with the data.
Thats the simplis way.
INTP
"The more help VB provides VB programmers, the more miserable your life as a C++ programmer becomes."
Andrew W. Troelsen
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