My First Win32 API Program! Non-Sense Errors!

[f.ben.isaac]

I have VC++ Express 2008

my main program

#include<windows.h>
// LESSON TWO
// specify a tag name of our main window (called window class name) , it will be registered in WNDCLASSEX.
const char mainWindowClassName[] = "MainWindowClass";
   
LRESULT CALLBACK WndProc(HWND hwnd, UNIT msg, WPARAM wParam, LPARAM lParam)
{
    switch(msg)
    {
        case WM_CLOSE:
            DestroyWindow(hwnd);
            break;
        case WM_DESTROY:
            PostQuitMessage(0);
            break;
        default:
            return DefWindowProc(hwnd, msg, wParam,lParam);
    }

    // Typically if you handle a message in the WndProc, you return zero.
    return 0;
}

// Start program
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
    // Windows class structure is used to register our window class name
    WNDCLASSEX wc;
    HWND hwnd;
    MSG Msg;

    // Step 1: Registering the Window Class
    wc.cbSize        = sizeof(WNDCLASSEX);              // the size of the structure.
    wc.style         = CS_HREDRAW | CS_VREDRAW;         // look at GameTutorial for explaination.
    wc.lpfnWndProc   = WndProc;                         // assign pointer to the window procedure for this window class.
    wc.cbClsExtra    = 0;                               // amount of extra data allocated for this class in memory. Usually 0.
    wc.cbWndExtra    = 0;                               // amount of extra data allocated in memory per window of this type. Usually 0.
    wc.hInstance     = hInstance;                       // assign our hInstance to our window.
    wc.hIcon         = LoadIcon(NULL, IDI_APPLICATION); // large (usually 32x32) icon shown when the user presses Alt+Tab.
    wc.hCursor       = LoadCursor(NULL, IDC_ARROW);     // cursor that will be displayed over our window.
    wc.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);        // background Brush to set the color of our window.
    wc.lpszMenuName  = NULL;                            // name of a menu resource to use for the windows with this class.
    wc.hIconSm       = LoadIcon(NULL, IDI_APPLICATION); // small (usually 16x16) icon to show in the taskbar and in the top left corner of the window.

    if(!RegisterClassEX(&wc))
    {
        MessageBox(NULL, "Window Registration Failed!", "Error!", MB_ICONEXCLAMATION | MB_OK);
        exit(-1);
    }

    hwnd = CreateWindowEx(WS_EX_CLIENTEDGE, mainWindowClassName, "The title of my window",
        WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, 240, 120, NULL, NULL, hInstance, NULL);

    if(hwnd == NULL)
    {
        MessageBox(NULL, "Window Creation Failed!", "Error!", MB_ICONEXCLAMATION | MB_OK);
        exit(-1);
    }

    ShowWindow(hwnd, nCmdShow);
    UpdateWindow(hwnd);

   
    while(GetMessage(&Msg, NULL, 0, 0) > 0)
    {

        TranslateMessage(&Msg);

        DispatchMessage(&Msg);
    }

    UnregisterClass(mainWindowClassName, hInstance);       

    return Msg.wParam;
}

These are the errors:

------ Rebuild All started: Project: test, Configuration: Debug Win32 ------
Deleting intermediate and output files for project 'test', configuration 'Debug|Win32'
Compiling...
test.cpp
c:\documents and settings\fahmi\desktop\test\test\test.cpp(6) : error C2061: syntax error : identifier 'UNIT'
c:\documents and settings\fahmi\desktop\test\test\test.cpp(8) : error C2065: 'msg' : undeclared identifier
c:\documents and settings\fahmi\desktop\test\test\test.cpp(8) : error C2050: switch expression not integral
c:\documents and settings\fahmi\desktop\test\test\test.cpp(17) : error C2065: 'msg' : undeclared identifier
c:\documents and settings\fahmi\desktop\test\test\test.cpp(17) : error C2065: 'wParam' : undeclared identifier
c:\documents and settings\fahmi\desktop\test\test\test.cpp(17) : error C2065: 'lParam' : undeclared identifier
c:\documents and settings\fahmi\desktop\test\test\test.cpp(35) : error C2440: '=' : cannot convert from 'LRESULT (__stdcall *)(HWND)' to 'WNDPROC'
This conversion requires a reinterpret_cast, a C-style cast or function-style cast
c:\documents and settings\fahmi\desktop\test\test\test.cpp(45) : error C3861: 'RegisterClassEX': identifier not found
c:\documents and settings\fahmi\desktop\test\test\test.cpp(47) : error C3861: '_T': identifier not found
Build log was saved at "file://c:\Documents and Settings\Fahmi\Desktop\test\test\Debug\BuildLog.htm"
test - 9 error(s), 0 warning(s)
========== Rebuild All: 0 succeeded, 1 failed, 0 skipped ==========


Note: i set character to Multi-Byte in config. box

Can you help please?!

[Paul McKenzie]

UNIT

What is a "UNIT"? The Windows constant name is UINT, not UNIT.

Regards,

Paul McKenzie

[f.ben.isaac]

Thanks, i wasn't aware about it....!

Compiles, but the program breaks - unexpected error occurs while debugging, i copied this code from a tutorial.

Anyway, i will double check it.

[ovidiucucu]

i copied this code from a tutorial.

It seems to be a tutorial with some (typing) errors.
Beside that Paul already discovered, change also RegisterClassEX with RegisterClassEx (in C/C++ identifiers are case-sensitive), then add this line before call it

   wc.lpszClassName = mainWindowClassName;

[ Redirected thread ]

[f.ben.isaac]

WORKED! Perfect

[Mal Reynolds]

two suggestions:
1) Dev-C++ IDE has a "template" win32 project that is a simple-but-complete program that compiles.

2) I'm not sure what tutorial you are using but when i was learning, i found this one to be the best: http://www.winprog.org/tutorial/

also, Charles Petzold's "Programming Windows" is an invaluable book, and also the online MSDN library is an invaluable resource for windows programming.

regards.