How to hide/show a Process using c#?
- by aF
Hello,
While executing my program, I want to hide/minimize Microsoft Speech Recognition Application:
and at the end I want to show/maximize using c#!
This process is not started by me so I can't give control the process startInfo.
I've tried to use user32.dll methods such as:
ShowWindow
AnimatedWindows
AnimatedWindows
With all of them I have the same problem.
I can hide the windows (althought I have to call one of the methods two times with SW_HIDE option), but when I call the method with a SW_SHOW flag, it simply doesn't shows..
How can I maximize/show after hiding the process?
Thanks in advance!
Here is some pieces of the code, now implemented to use SetWindowPlacement:
{
[DllImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern bool GetWindowPlacement(IntPtr hWnd, ref WINDOWPLACEMENT lpwndpl);
[DllImport("user32.dll", SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool SetWindowPlacement(IntPtr hWnd,
[In] ref WINDOWPLACEMENT lpwndpl);
[DllImport("user32.dll")]
public static extern Boolean ShowWindowAsync(IntPtr hWnd, Int32 nCmdShow);
[DllImport("user32.dll")]
public static extern Boolean SetForegroundWindow(IntPtr hWnd);
[DllImport("user32.dll")]
public static extern Boolean ShowWindow(IntPtr hWnd, Int32 nCmdShow);
[DllImport("user32.dll")]
public static extern Boolean AnimateWindow(IntPtr hWnd, uint dwTime, uint dwFlags);
[DllImport("dwmapi.dll")]
public static extern int DwmSetWindowAttribute(IntPtr hwnd, uint dwAttribute, IntPtr pvAttribute, IntPtr lol);
//Definitions For Different Window Placement Constants
const UInt32 SW_HIDE = 0;
const UInt32 SW_SHOWNORMAL = 1;
const UInt32 SW_NORMAL = 1;
const UInt32 SW_SHOWMINIMIZED = 2;
const UInt32 SW_SHOWMAXIMIZED = 3;
const UInt32 SW_MAXIMIZE = 3;
const UInt32 SW_SHOWNOACTIVATE = 4;
const UInt32 SW_SHOW = 5;
const UInt32 SW_MINIMIZE = 6;
const UInt32 SW_SHOWMINNOACTIVE = 7;
const UInt32 SW_SHOWNA = 8;
const UInt32 SW_RESTORE = 9;
public sealed class AnimateWindowFlags
{
public const int AW_HOR_POSITIVE = 0x00000001;
public const int AW_HOR_NEGATIVE = 0x00000002;
public const int AW_VER_POSITIVE = 0x00000004;
public const int AW_VER_NEGATIVE = 0x00000008;
public const int AW_CENTER = 0x00000010;
public const int AW_HIDE = 0x00010000;
public const int AW_ACTIVATE = 0x00020000;
public const int AW_SLIDE = 0x00040000;
public const int AW_BLEND = 0x00080000;
}
public struct WINDOWPLACEMENT
{
public int length;
public int flags;
public int showCmd;
public System.Drawing.Point ptMinPosition;
public System.Drawing.Point ptMaxPosition;
public System.Drawing.Rectangle rcNormalPosition;
}
//this works
param = new WINDOWPLACEMENT();
param.length = Marshal.SizeOf(typeof(WINDOWPLACEMENT));
param.showCmd = (int)SW_HIDE;
lol = SetWindowPlacement(theprocess.MainWindowHandle, ref param);
// this doesn't work
WINDOWPLACEMENT param = new WINDOWPLACEMENT();
param.length = Marshal.SizeOf(typeof(WINDOWPLACEMENT));
param.showCmd = SW_SHOW;
lol = GetWindowPlacement(theprocess.MainWindowHandle, ref param);
