怎样通过正在运行的Process获取窗体的实例?
今天在做程序的单实例运行时发现个问题(Winform),我将程序运行后最小化到托盘,再次双击程序时弹出已运行的程序。
[code=C#]
[DllImport( "User32.dll ")]
private static extern bool ShowWindowAsync(IntPtr hWnd, int cmdShow);
[DllImport( "User32.dll ")]
private static extern bool SetForegroundWindow(IntPtr hWnd);
private const int WS_SHOWNORMAL = 1;
/// <summary>
/// 程序入口
/// </summary>
[STAThread]
static void Main()
{
//其他代码省略。。。
Process instance = RunningInstance();
if (instance == null)
{//运行程序}
else//程序已经运行,显示已运行的程序
{
System.IntPtr handler = instance.MainWindowHandle;
frmDefault frm = (frmDefault)Form.FromHandle(handler);//frmDefault程序主窗体,就是这句的问题
frm.FormOpen();//主窗体中点击托盘图标显示窗体的方法
}
}
[/code]
frmDefault frm = (frmDefault)Form.FromHandle(handler);这句获取的frm是Null.
我试了下Form frm = (Form)Form.FromHandle(handler);frm 还是Null
请问怎么能通过运行的Process得到窗体的实例?
------解决方案--------------------
用API:
ShowWindow(SW_SHOWNORMAL);
------解决方案--------------------帮顶~~~~~~~~~
------解决方案--------------------搞不懂 是不是可以父子窗体来搞这个东西
------解决方案--------------------我以前也做过类似的功能,就是当一个.exe程序(winform应用程序)已经打开的时候,再双击图标打开的时候就提示:程序已经启动,具体实现代码如下:
[STAThread]
static void Main()
{
bool canStart;
System.Threading.Mutex mutex = new System.Threading.Mutex(false,"进程名字-不带.exe的(也就是窗体的名字),我这里是GIS_DMC",out canStart);
if (canStart)
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new GIS_DMCForm());
}
else
{
MessageBox.Show("程序已启动");
}
}
------解决方案--------------------
C# code
[DllImport("User32.dll ", EntryPoint = "FindWindow")]
private static extern IntPtr FindWindow(string lpClassName, string lpWindowName);
[DllImport("user32.dll", EntryPoint = "ShowWindow", CharSet = CharSet.Auto)]
public static extern int ShowWindow(IntPtr hwnd, int nCmdShow);
[DllImport("user32.dll", EntryPoint = "SetForegroundWindow")]
public static extern bool SetF(IntPtr hWnd);
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Process current = RunningInstance();
if (current != null)
{
IntPtr handle = FindWindow(null, "Form1");
ShowWindow(handle, 1);
SetF(handle);
}
else
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new Form1(