Thread: new to windows programming

in the menu go to Project -> Settings -> click on the C/C++ tab -> in Catagory Select 'Precompiled Headers', click the 'automatic use of precompiled headers' or 'not using precompiled headers' radio button.

and the error will be gone.

thanks no-one the error was fixed but i got 2 other ones

i'll show u the code so u can see whats going on

Code:

#include <windows.h>


LRESULT CALLBACK WindowProcedure
    (HWND hwnd, unsigned int message, WPARAM wParam, LPARAM lParam);

class WinClass
{
public:
    WinClass (WNDPROC winProc, char const * className, HINSTANCE hInst);
    void Register ()
    {
        ::RegisterClass (&_class);
    }
private:
    WNDCLASS _class;
};

WinClass::WinClass
    (WNDPROC winProc, char const * className, HINSTANCE hInst)
{
    _class.style = 0;
    _class.lpfnWndProc = winProc; // window procedure: mandatory
    _class.cbClsExtra = 0;
    _class.cbWndExtra = 0;
    _class.hInstance = hInst;         // owner of the class: mandatory
    _class.hIcon = 0;
    _class.hCursor = ::LoadCursor (0, IDC_ARROW); // optional
    _class.hbrBackground = (HBRUSH) (COLOR_WINDOW + 1); // optional
    _class.lpszMenuName = 0;
    _class.lpszClassName = className; // mandatory
}



class WinMaker
{
public:
    WinMaker (): _hwnd (0) {}
    WinMaker (char const * caption, 
              char const * className,
              HINSTANCE hInstance);
    void Show (int cmdShow)
    {
        ::ShowWindow (_hwnd, cmdShow);
        ::UpdateWindow (_hwnd);
    }
protected:
    HWND _hwnd;
};

WinMaker::WinMaker (char const * caption, 
                    char const * className,
                    HINSTANCE hInstance)
{
    _hwnd = ::CreateWindow (
        className,            // name of a registered window class
        caption,              // window caption
        WS_OVERLAPPEDWINDOW,  // window style
        CW_USEDEFAULT,        // x position
        CW_USEDEFAULT,        // y position
        CW_USEDEFAULT,        // witdh
        CW_USEDEFAULT,        // height
        0,                    // handle to parent window
        0,                    // handle to menu
        hInstance,            // application instance
        0);                   // window creation data
}


int WINAPI WinMain (HINSTANCE hInst, HINSTANCE hPrevInst,
            char * cmdParam, int cmdShow)
{
    char className [] = "Winnie";

    WinClass winClass (WindowProcedure, className, hInst);
    winClass.Register ();

    WinMaker win ("Hello Windows!", className, hInst);
    win.Show (cmdShow);

    MSG  msg;
    int status;

    while ((status = ::GetMessage (& msg, 0, 0, 0)) != 0)
    {
        if (status == -1)
            return -1;
        ::DispatchMessage (& msg);
    }

    return msg.wParam;
}

also must i do that thing with the precompilers everytime
i want to do something like this?

here are the new errors:

oooo.obj : error LNK2001: unresolved external symbol "long __stdcall WindowProcedure(struct HWND__ *,unsigned int,unsigned int,long)" (?WindowProcedure@@YGJPAUHWND__@@IIJ@Z)

and

oooo.exe : fatal error LNK1120: 1 unresolved externals
error executing link.exe.



thanks in advance

i've seen that code somewhere before. did you download that off a website?

you never defined WindowProcedure()

add this to the bottom of the source.

Code:

LRESULT CALLBACK WindowProcedure(HWND hwnd, unsigned int message, WPARAM wParam, LPARAM lParam)
{
    switch(message)
    {
        // handle messages here.

    }
    return DefWindowProc(hwnd,message,wParam,lParam);
}

>u did'nt answer my question about if i must do the thing in settings with the precompilers

you mean turning off the precompiled headers?

as far as i know you have to do it every time...

with the "empty project" option you don't need to turn them off. For some reason, procompiled header files are not a default option for that. go figure