Should be simple C++ managed header include question

[Steven Edison]

I have a split container on my form,
from within one of them I wish to reach
the main from of the app. I'm having
problems with the headers and namespaces.
I want something like this:

//within right pane form
ABCForm^ abcForm = (ABCForm^)Application::OpenForms["ABCForm"];
abcForm->ExecutePublicFunction();

If I include the main form header I get:

'ABCForm' : undeclared identifier
'abcForm' : undeclared identifier
syntax error: ')'
and many more....

The two forms are of the same namespace.

if within the namespace I do this:

namespace ABC{
ref class VPEForm;
public ref class OtherForm : public Form
{


the line:
ABCForm^ abcForm = (ABCForm^)Application::OpenForms["ABCForm"];
will compile without complaint. But then the line:
abcForm->ExecutePublicFunction();

I get:
use of undefined type : 'ABC:ABCForm'
Like it sees the 'ref class VPEForm' as the complete definition of
the class.

So what's the proper way to reference the other form and handle
the includes and namespace from another form?

This should be simple I know...

Thanks,

Steven

 

[Steven Edison]

The solution I ended up using was putting the code and includes in the
cpp file. This prevented the crossed up references in the headers.

 

[Jeffrey Tan[MSFT]]

Hi Steven,

I am not sure if you still need help on this issue. Based on my
understanding, you are accessing one Form type from another Form type,
however, the compiler can not recognize the cross file Form types and will
emit an error "undeclared identifier" in C++/CLI.

Yes, I have created a sample C++/CLI Winform project and added 2 forms in
the project. In Form1, if I wrote the code below:
System::Void button1_Click(System::Object^ sender, System::EventArgs^ e) {
Form2 ^test=gcnew Form2();
test->Show();
}
I will get the same error as you.

To resolve this problem, we may include the Form2.h header file in the
Form1.h like below.
#include "Form2.h"

This will resolve the problem on my side.

Hope this helps.

Best regards,
Jeffrey Tan
Microsoft Online Community Support
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