Function declaration/definition

[paramecula]

This is my first VC++ app, so apologies for the stupid question.

In my app, I want to call various user-defined functions. When I try to compile, I'm getting a 'undeclared identifier' error for each function call. From what I've read, I have to declare the function before I use it, but where do I do this and how ?

The VC++ books I have don't address this and the C++ ones say to declare it before int main() function, which doesn't seem to apply to VC++.

Any help appreciated

 

[Skute]

easy:

void MyFunction(int nParam1);

int main(int argc, char* argv[])
{
MyFunction(1);
}

void MyFunction(int nParam1)
{
// Do something
}

Hope that helps!

Skute

"There are 10 types of people in this World, those that understand binary, and those that don't!"

 

[paramecula]

Thanks for the quick reply.

My app is dailog-based and I pasted your code into the Dlg.cpp file and it compiles OK. But when I replace your 'do something' with what I want to do (m_webbrowser.Navigate("url",...)), I get an error telling me that m_webbrowser is an undeclared identifier.

I've already used this variable successfully on a button on the app using a BN_CLICKED message and it opened the website I typed into the url parameter. Why doesn't it like m_webbrowser now ? Do I have to do something with the browser class/.cpp/.h in order for it to 'see' the new function I'm using it in ?

Thanks in advance.

 

[timmay3141]

Make sure the function you are trying to call m_webbrowser.Navigate() from is declared and defined as a member of the class to which m_webbrowser belongs. Sometimes I forget to add the CMyClass:: before the function name in the definition, which causes this kind of problem.

 

[cpjust]

Define all your classes and functions in separate header files and put their implementation in .cpp files. Include the header files wherever you plan on using those classes/functions.
Also, make sure to put the proper #ifndef statements in the header files so you don't include it more than once.
Example:

// Header for CObject class.
#ifndef COBJECT_HEADER
#define COBJECT_HEADER

class CObject
{
public:
    CObject();
    virtual ~CObject();
};

#endif