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Include h files
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Why does I encounter a compileerror when doing this.
Compile error says.
'Form3' : undeclared identifier
'Form4' : undeclared identifier
Inside of Form4.h:
Inside of Form3.h:
Compile error says.
'Form3' : undeclared identifier
'Form4' : undeclared identifier
Inside of Form4.h:
C++ Syntax (Toggle Plain Text)
Inside of Form3.h:
C++ Syntax (Toggle Plain Text)
Last edited by Liszt; Nov 9th, 2008 at 5:48 pm.
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because you have recursive includes -- form3.h includes form4.h which includes form3.h ...
Not a good idea, as you have found out.
Not a good idea, as you have found out.
Don't PM me with questions -- you might get a nasty PM in response. If you have a question then post it in one of the forums.
That shouldn´t be a good idéa so I get over many examples how to go around this problem.
In somehow I have to use any form of a forward declaration. This is my code so far.
Still I have the compilerror for:
'Form22' : no appropriate default constructor available
I have followed an example but are not defenetive of what is going on in this code and would greatly appreciate any guidance in the code in order to really understand it.
Inside Form3.h
Inside Form3.cpp
Inside Form4.h
Inside Form4.cpp
In somehow I have to use any form of a forward declaration. This is my code so far.
Still I have the compilerror for:
'Form22' : no appropriate default constructor available
I have followed an example but are not defenetive of what is going on in this code and would greatly appreciate any guidance in the code in order to really understand it.
Inside Form3.h
C++ Syntax (Toggle Plain Text)
Inside Form3.cpp
C++ Syntax (Toggle Plain Text)
Inside Form4.h
C++ Syntax (Toggle Plain Text)
Inside Form4.cpp
C++ Syntax (Toggle Plain Text)
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Originally Posted by Ancient Dragon 
because you have recursive includes -- form3.h includes form4.h which includes form3.h ...
Not a good idea, as you have found out.
Last edited by Liszt; Nov 9th, 2008 at 8:25 pm.
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I think in the *.cpp implementation files you need to add
using namespace <namespace name>; . That made it work in my test program. Don't PM me with questions -- you might get a nasty PM in response. If you have a question then post it in one of the forums.
Okay, thank you. In your testprogram, did you try to open eachothers forms
or just compiling the code without the code that open forms ?
I could wonder what this meen.
If I use that line in the *.cpp files, I will have the errors:
1>.\Form3.cpp(5) : error C2059: syntax error : '<'
1>.\Form4.cpp(6) : error C2059: syntax error : '<'
If I dont use the using namespace <namespace name>; line and dont use the codes that will open eachothers forms, it will compiles fine. I dont know what this leaves the problem or solution.
or just compiling the code without the code that open forms ?
I could wonder what this meen.
using namespace <namespace name>; If I use that line in the *.cpp files, I will have the errors:
1>.\Form3.cpp(5) : error C2059: syntax error : '<'
1>.\Form4.cpp(6) : error C2059: syntax error : '<'
If I dont use the using namespace <namespace name>; line and dont use the codes that will open eachothers forms, it will compiles fine. I dont know what this leaves the problem or solution.
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Originally Posted by Ancient Dragon
I think in the *.cpp implementation files you need to add using namespace <namespace name>; . That made it work in my test program. Last edited by Liszt; Nov 9th, 2008 at 9:16 pm.
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Replace the "<namespace name>" with the namespace used in your programs. You can find this in the *.h file, for example
Yours will be different than mine -- the VC++ 2008 compiler generates the namespace name based on the project name when you created the project.
So I added this line:
#pragma once
using namespace System;
using namespace System::ComponentModel;
using namespace System::Collections;
using namespace System::Windows::Forms;
using namespace System::Data;
using namespace System::Drawing;
#include "Form1.h"
namespace testform {Yours will be different than mine -- the VC++ 2008 compiler generates the namespace name based on the project name when you created the project.
So I added this line:
using namespace testform; Last edited by Ancient Dragon; Nov 9th, 2008 at 10:18 pm.
Don't PM me with questions -- you might get a nasty PM in response. If you have a question then post it in one of the forums.
I didn´t understand that it was the projectname I should have written, sorry for that.
My projectname is simply "Form1" as in your testprogram "testform"
So now I guess I have written the *.cpp files correct. But still there is errors.
Form3.cpp
Form4.cpp
Exactly the same compileerror situation occurs anyway with this in place but I
will only have these compileerrors if I use these codes that would open eachothers
forms and the compiler only gives errors for Form4 and not Form3:
I dont know if there could be any more clues to the error.
'Form4' : no appropriate default constructor available
use of undefined type 'Form4'
left of '->ShowDialog' must point to class/struct/union/generic type
Form3.h
Form4.h
My projectname is simply "Form1" as in your testprogram "testform"
So now I guess I have written the *.cpp files correct. But still there is errors.
Form3.cpp
#include "stdafx.h"
#include "Form3.h"
#include "Form4.h"
Form4 ^Form3::SomeMethodA()
{
return gcnew Form4;
}
using namespace Form1;Form4.cpp
#include "stdafx.h"
#include "Form3.h"
#include "Form4.h"
Form3 ^Form4::SomeMethodB()
{
return gcnew Form3;
}
using namespace Form1;Exactly the same compileerror situation occurs anyway with this in place but I
will only have these compileerrors if I use these codes that would open eachothers
forms and the compiler only gives errors for Form4 and not Form3:
I dont know if there could be any more clues to the error.
'Form4' : no appropriate default constructor available
use of undefined type 'Form4'
left of '->ShowDialog' must point to class/struct/union/generic type
Form3.h
C++ Syntax (Toggle Plain Text)
Form4.h
C++ Syntax (Toggle Plain Text)
Last edited by Liszt; Nov 9th, 2008 at 11:11 pm.
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zip up the project minus object files and post it so that we can see what the problem is.
Don't PM me with questions -- you might get a nasty PM in response. If you have a question then post it in one of the forums.
Thank You, I have zipped the project, the object files only took 18 kB unzipped so I left them there in case anyway.
I removed a file named: VC++ Intellisense DataBase wich took up 10.9 MB of memory.
It was not possible to upload the file with this in the folder.
I hope I am sending the project correctly.
I removed a file named: VC++ Intellisense DataBase wich took up 10.9 MB of memory.
It was not possible to upload the file with this in the folder.
I hope I am sending the project correctly.
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Originally Posted by Ancient Dragon
zip up the project minus object files and post it so that we can see what the problem is.
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Join Date: Aug 2005
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move the implementation of button1_Click() from Form3.h to Form3.cpp. Attached are new files. It still has link problems for unresolved external functions, but you just have to implenent them in the *.cpp files.
Last edited by Ancient Dragon; Mar 10th, 2009 at 1:13 pm.
Don't PM me with questions -- you might get a nasty PM in response. If you have a question then post it in one of the forums.
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