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Implemented "start minimized, no focus" for
ffmpeg process start
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,151 @@ | ||
| using System; | ||
| using System.ComponentModel; | ||
| using System.Diagnostics; | ||
| using System.Reflection; | ||
| using System.Threading; | ||
| using System.Runtime.InteropServices; | ||
| using Microsoft.Win32.SafeHandles; | ||
|
|
||
| namespace CDN_Video_Uploader.Utils | ||
| { | ||
| public class BackgroundProcess : Process | ||
| { | ||
| public unsafe bool StartMinimizedNoFocus() | ||
| { | ||
| if (string.IsNullOrEmpty(this.StartInfo.FileName)) | ||
| throw new InvalidOperationException("Missing StartInfo.FileName"); | ||
|
|
||
| if (!this.StartInfo.UseShellExecute) | ||
| throw new InvalidOperationException( | ||
| "Cannot start `minimized no focus` process without ShellExecute"); | ||
|
|
||
| // Stop the process if it is currently running | ||
| this.Close(); | ||
|
|
||
| fixed (char* fileName = this.StartInfo.FileName.Length > 0 ? this.StartInfo.FileName : null) | ||
| fixed (char* verb = this.StartInfo.Verb.Length > 0 ? this.StartInfo.Verb : null) | ||
| fixed (char* args = this.StartInfo.Arguments.Length > 0 ? this.StartInfo.Arguments : null) | ||
| fixed (char* directory = this.StartInfo.WorkingDirectory.Length > 0 ? this.StartInfo.WorkingDirectory : null) | ||
| { | ||
| Shell32.SHELLEXECUTEINFO shellExecuteInfo = new Shell32.SHELLEXECUTEINFO() | ||
| { | ||
| cbSize = (uint)sizeof(Shell32.SHELLEXECUTEINFO), | ||
| lpFile = fileName, | ||
| lpVerb = verb, | ||
| lpParameters = args, | ||
| lpDirectory = directory, | ||
| fMask = Shell32.SEE_MASK_NOCLOSEPROCESS | Shell32.SEE_MASK_FLAG_DDEWAIT | ||
| }; | ||
|
|
||
| if (this.StartInfo.ErrorDialog) | ||
| shellExecuteInfo.hwnd = this.StartInfo.ErrorDialogParentHandle; | ||
| else | ||
| shellExecuteInfo.fMask |= Shell32.SEE_MASK_FLAG_NO_UI; | ||
|
|
||
| shellExecuteInfo.nShow = Shell32.SW_SHOWMINNOACTIVE; | ||
|
|
||
| ShellExecuteHelper executeHelper = new ShellExecuteHelper(&shellExecuteInfo); | ||
| if (!executeHelper.ShellExecuteOnSTAThread()) | ||
| { | ||
| int error = executeHelper.ErrorCode; | ||
| if (error == 0) | ||
| error = (int)(long)error; | ||
| throw new Win32Exception(error); | ||
| } | ||
|
|
||
| if (shellExecuteInfo.hProcess != IntPtr.Zero) | ||
| { | ||
| // SetProcessHandle(new SafeProcessHandle(shellExecuteInfo.hProcess)); | ||
| // Invoke the above private emthod through reflection | ||
| SafeProcessHandle safeHandle = | ||
| new SafeProcessHandle(shellExecuteInfo.hProcess, true); | ||
| Type typeProcess = typeof(Process); | ||
| MethodInfo setProcessHandleMethod = typeProcess.GetMethod("SetProcessHandle", | ||
| BindingFlags.NonPublic | BindingFlags.Instance); | ||
| setProcessHandleMethod.Invoke(this, new object[] { safeHandle }); | ||
|
|
||
| return true; | ||
| } | ||
| } | ||
|
|
||
| return false; | ||
| } | ||
|
|
||
| internal unsafe class ShellExecuteHelper | ||
| { | ||
| private Shell32.SHELLEXECUTEINFO* _executeInfo; | ||
| private bool _succeeded; | ||
| private int _errorCode; | ||
|
|
||
| public ShellExecuteHelper(Shell32.SHELLEXECUTEINFO* executeInfo) | ||
| { | ||
| this._executeInfo = executeInfo; | ||
| } | ||
|
|
||
| public void ShellExecuteFunction() | ||
| { | ||
| if (!(this._succeeded = Shell32.ShellExecuteEx(this._executeInfo))) | ||
| { | ||
| this._errorCode = Marshal.GetLastWin32Error(); | ||
| } | ||
| } | ||
|
|
||
| public bool ShellExecuteOnSTAThread() | ||
| { | ||
| if (Thread.CurrentThread.GetApartmentState() != ApartmentState.STA) | ||
| { | ||
| ThreadStart start = new ThreadStart(this.ShellExecuteFunction); | ||
| Thread thread = new Thread(start); | ||
| thread.SetApartmentState(ApartmentState.STA); | ||
| thread.Start(); | ||
| thread.Join(); | ||
| } | ||
| else | ||
| { | ||
| this.ShellExecuteFunction(); | ||
| } | ||
| return this._succeeded; | ||
| } | ||
|
|
||
| public int ErrorCode => this._errorCode; | ||
| } | ||
|
|
||
| internal class Shell32 | ||
| { | ||
| [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)] | ||
| internal unsafe struct SHELLEXECUTEINFO | ||
| { | ||
| public uint cbSize; | ||
| public uint fMask; | ||
| public IntPtr hwnd; | ||
| public char* lpVerb; | ||
| public char* lpFile; | ||
| public char* lpParameters; | ||
| public char* lpDirectory; | ||
| public int nShow; | ||
| public IntPtr hInstApp; | ||
| public IntPtr lpIDList; | ||
| public IntPtr lpClass; | ||
| public IntPtr hkeyClass; | ||
| public uint dwHotKey; | ||
| // This is a union of hIcon and hMonitor | ||
| public IntPtr hIconMonitor; | ||
| public IntPtr hProcess; | ||
| } | ||
|
|
||
| internal const int SW_HIDE = 0; | ||
| internal const int SW_SHOWNORMAL = 1; | ||
| internal const int SW_SHOWMINIMIZED = 2; | ||
| internal const int SW_SHOWMAXIMIZED = 3; | ||
| internal const int SW_SHOWNOACTIVATE = 4; | ||
| internal const int SW_SHOWMINNOACTIVE = 7; | ||
|
|
||
| internal const uint SEE_MASK_FLAG_DDEWAIT = 0x00000100; | ||
| internal const uint SEE_MASK_NOCLOSEPROCESS = 0x00000040; | ||
| internal const uint SEE_MASK_FLAG_NO_UI = 0x00000400; | ||
|
|
||
| [DllImport("shell32.dll", CharSet = CharSet.Auto, SetLastError = true)] | ||
| internal static unsafe extern bool ShellExecuteEx(SHELLEXECUTEINFO* lpExecInfo); | ||
| } | ||
| } | ||
| } |