How to auto-hide the taskbar from the command line

Question

Does anyone know how I can automatically hide the task bar in windows 7 via command line or some other method?

Answer 1

Here's a little C program that will toggle the hidden/shown state of the taskbar window. Note that when it's hidden it's actually gone from the screen completely (it's not in auto-hide mode).

#include <windows.h>

int main() {
    HWND hwnd = FindWindow("Shell_traywnd", "");
    if (IsWindowVisible(hwnd))
        SetWindowPos(hwnd,0,0,0,0,0,SWP_HIDEWINDOW);
    else
        SetWindowPos(hwnd,0,0,0,0,0,SWP_SHOWWINDOW);
    return 0;
}

Using SHAppBarMessage. This one toggles the autohide state.

#include <windows.h>
#include <shellapi.h>

// This isn't defined for me for some reason.
#ifndef ABM_SETSTATE
#define ABM_SETSTATE 0x0000000A
#endif

int main() {
    APPBARDATA abd = {sizeof abd};
    UINT uState = (UINT) SHAppBarMessage(ABM_GETSTATE, &abd);
    LPARAM param = uState & ABS_ALWAYSONTOP;
    if (uState & ABS_AUTOHIDE)
        abd.lParam = param;
    else
        abd.lParam = ABS_AUTOHIDE | param;
    SHAppBarMessage(ABM_SETSTATE, &abd);
    return 0;
}