Programming In C and Win32 API: Comparing Strings

I am writing a program in C and Windows API. I am using Vis开发者_如何学Goual Studio 2010 Express and Character Set is set to "Not Set". I have made an edit control to accept username. Here's declaration:

hwnduser = CreateWindow (TEXT("EDIT"), NULL, 
    WS_VISIBLE | WS_CHILD | WS_BORDER,
    220, 70, 80, 20,
    hwnd, (HMENU) 3, NULL, NULL);

I am fetching its value into a string named username.

len = GetWindowTextLength(hwnduser) + 1;
GetWindowText(hwnduser, username, len);

Now, the valid username is in a string called c_user:

char c_user[] = "foo";

When I compare them to check if the user has entered valid username using following code,

if (username == c_user)
{
  MessageBox(hwnd, "Foo", "Bar", MB_OK);
}
else
{
  MessageBox(hwnd, "Bar", "Foo", MB_OK);
}

It never validates. Instead, the else condition is always executed! Where am I making a mistake?

How to correct this?

I have tried strcmp! But still, output does not change. See the output(and comparison in code):

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C and C++ have no built-in string type and so you cannot compare strings this way. C and C++ instead use an array of chars and this syntax simply compares the address of each array (which won't match).

Instead use strcmp() or _tcscmp().

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I believe you'll actually need to use wchar_t's (wide characters). it's been a while since I've looked at the syntax but i think it'll be something like this:

wchar_t* c_user = L"foo";

if (wcscmp(username, c_user) == 0) ...

make sure username is also defined as the correct type.

you might also look into TCHAR which is a more generic representatic of a character type (it changes based off of the compiler settings). depending on settings, itll either be a char or wchar_t i think.

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Writing username == c_user checks whether they both point to the same memory location.
You need to call strcmp to compare the strings' values.

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I'd use strcmp (or any synonym)

   if ( strcmp( username, c_user) == 0 )
   {
       // 0 indicate there is no difference, thus equal
    }
    else
    {
    }

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You should use strcmp for this , or strcmpi if you want to ignore the case.

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if (strcmp(username, c_user) == 0) { ... }

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Use the functions GetWindowTextA() and MessageBoxA(), it works for me.