Question

在MFC程序中，您可以通过检查m_nCmdShow的值来确定应用程序快捷方式是否将“运行”值设置为“最小化”。在c＃中有相同的方法吗？

为了澄清，我不想设置特定表单的状态。如果查看快捷方式的属性，则会显示“运行”选项。您可以将此值设置为“正常窗口”，“最小化”或“最大化”。

在C ++中，您可以通过查看m_nCmdShow来了解启动值的设置。我需要在C＃中做同样的事情。

更新

这次尝试：

[STAThread]
static void Main(string[] args)
{
    ProcessStartInfo processInfo = Process.GetCurrentProcess().StartInfo;
    MessageBox.Show(processInfo.WindowStyle.ToString());
    ...
}

始终报告Normal，无论快捷方式设置为什么。

Answer 1

在WindowsForms中，它是Form类的WindowState属性。在设计时在属性中检查它或从代码中设置它。

编辑：从快捷方式运行程序时，Windows可能会使用CreateProcess API将STARTUPINFO结构传递给它。

从Windows窗体应用程序中，您可以通过这种方式获得此类结构：

System.Diagnostics.Process.GetCurrentProcess().StartInfo

包含属性：WindowStyle，其可用值是枚举的值：

System.Diagnostics.ProcessWindowStyle

这样：

Hidden;
Minimized;
Maximized;
Normal;

这就是OP正在寻找m_nCmdShow的映射。

Answer 2

这使您可以通过访问代码中的NativeMethods.StartupInfo.GetInitialWindowStyle()来检索初始窗口状态。您可以通过访问NativeMethods.StartupInfo.FromCurrentProcess来使用更多信息。如果您使用START "My Program Title" /MIN MyProgram.exe从cmd.exe启动程序，则会在NativeMethods.StartupInfo.FromCurrentProcess.lpTitle中找到“我的计划标题”，NativeMethods.StartupInfo.GetInitialWindowStyle()会返回ProcessWindowStyle.Minimized。

static partial class NativeMethods
{
    public static class StartupInfo
    {
        [StructLayout(LayoutKind.Sequential)]
        public class STARTUPINFO
        {
            public readonly UInt32 cb;  
            private IntPtr lpReserved;
            [MarshalAs(UnmanagedType.LPWStr)] public readonly string lpDesktop;
            [MarshalAs(UnmanagedType.LPWStr)] public readonly string lpTitle;
            public readonly UInt32 dwX;
            public readonly UInt32 dwY;
            public readonly UInt32 dwXSize;
            public readonly UInt32 dwYSize;
            public readonly UInt32 dwXCountChars;
            public readonly UInt32 dwYCountChars;
            public readonly UInt32 dwFillAttribute;
            public readonly UInt32 dwFlags;
            [MarshalAs(UnmanagedType.U2)] public readonly UInt16 wShowWindow;
            [MarshalAs(UnmanagedType.U2)] private UInt16 cbReserved2;
            private IntPtr lpReserved2;
            public readonly IntPtr hStdInput;
            public readonly IntPtr hStdOutput;
            public readonly IntPtr hStdError;
        }

        public readonly static STARTUPINFO FromCurrentProcess = null;

        const uint STARTF_USESHOWWINDOW = 0x00000001;
        const ushort SW_HIDE = 0;
        const ushort SW_SHOWNORMAL = 1;
        const ushort SW_SHOWMINIMIZED = 2;
        const ushort SW_SHOWMAXIMIZED = 3;
        const ushort SW_MINIMIZE = 6;
        const ushort SW_SHOWMINNOACTIVE = 7;
        const ushort SW_FORCEMINIMIZE = 11;

        [DllImport("kernel32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
        static extern void GetStartupInfoW(IntPtr startupInfoPtr);

        static StartupInfo() //Static constructor
        {
            FromCurrentProcess = new STARTUPINFO();
            int length = Marshal.SizeOf(typeof(STARTUPINFO));
            IntPtr ptr = Marshal.AllocHGlobal(length);

            Marshal.StructureToPtr(FromCurrentProcess, ptr, false);

            GetStartupInfoW(ptr);

            Marshal.PtrToStructure(ptr, FromCurrentProcess);
            Marshal.FreeHGlobal(ptr);
        }

        public static ProcessWindowStyle GetInitialWindowStyle()
        {
            if ((FromCurrentProcess.dwFlags & STARTF_USESHOWWINDOW) == 0) return ProcessWindowStyle.Normal;

            switch (FromCurrentProcess.wShowWindow)
            {
                case SW_HIDE: return ProcessWindowStyle.Hidden;
                case SW_SHOWNORMAL: return ProcessWindowStyle.Normal;
                case SW_MINIMIZE:
                case SW_FORCEMINIMIZE:
                case SW_SHOWMINNOACTIVE:
                case SW_SHOWMINIMIZED: return ProcessWindowStyle.Minimized;
                case SW_SHOWMAXIMIZED: return ProcessWindowStyle.Maximized;
                default: return ProcessWindowStyle.Normal;
            }
        }
    } 
}

是否有m＃等效的m_nCmdShow？

2 个答案: