Thread: Buttons Question in Window

In Windows, how does the window/os know when a button has been clicked, or released? Does it just check the position of the WM_LBUTTON when it checks for that?

Also, how does a window know it's in focus/how does it know the tab order, and how can you modify both of these focuses?

You can use SetFocus() to move the focus around and SetWindowPos() to adjust the windows Z order.

Originally Posted by kuphryn

Windows is a message based OS. Everything communicates via messages. So yes, a control receives mouse messages.

Kuphryn

What I mean is, how does the window and the os know that a BUTTON (meaning like, an Ok button, a Cancel button, etc) has been pressed? I get the message basics of windows, but I don't get what messages (if any) are sent / dealt with when a button is pressed. That's what I'm wondering ^_^

Btw thanks adrianx

You have to make a whole new proc message for those. Like the WndProc one you defined for the window you have to make a similar one for the button and it will send the button press message(s) to that proc.

EDIT: Or you could define something like IDN_PUSHBTN. This is if you are making a separate button in your window not in a dialog box. Then you call the CreateWindow function for the button. Here is an example of what a button's CreateWindow function looks like:

Code:

hwnd2=CreateWindowEx(WS_EX_CLIENTEDGE,"BUTTON","Click me!",WS_CHILD|WS_VISIBLE|BS_PUSHBUTTON,x/2,y/2,75,25,hwnd,
ID_PUSHBTN,hInstance,NULL);

. The x and y variables are just my window's size so the button will be in the middle. To get the messages for the button, like if it is clicked, then call this in your window's message function. Example:

Code:

case WM_COMMAND:
switch(LOWORD(wParam))
{
case ID_PUSHBTN:
MessageBox (NULL, "You clicked?" , "Clicked!", MB_ICONQUESTION);
break;
}
return 0;

Hope that helps!

So, lets say I wanted to emulate a button press, how would I get the value of that button? For instance, if I'm running a game and I want to auto login, and I want to click the 'login' button, lets say it was named ID_BTN_LOGIN or something.

Are buttons child windows of the parent window? Meaning, could I just use FindWindowEx() and SendMessageEx() to simulate a key/mouse button press for that button (which in this case would be a child window) ?

Yes buttons are child windows.

What about text box's? Is there any ehm...easy way to fill those?

Originally Posted by Tronic

What about text box's? Is there any ehm...easy way to fill those?

SetWindowText() is pretty easy.