知识点
1,通过进程名获取到的主窗体句柄不一定是这个程序的主窗体
2,通过进程名获取到的进程不唯一
3,通过Win32 API GetActiveWindow和SetActiveWindow 设置窗体激活不生效
4,通过Win32 API GetForegroundWindow和SetForegroundWindow 设置窗体激活有效
5,通过 Win32 API FindWindow 可根据窗体标题获取窗体句柄,
要求一定要有标题,并且有可能重复,窗体类没有深入研究
var hand = Win32Api.FindWindow(null, title)
窗体启动后，再次启动时判断进程是否存在，如果已经存在则直接拉起当前进程，前置显示并聚焦窗口。
/// <summary>/// 应用程序的主入口点。/// </summary>[STAThread]static void Main(string[] args){
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Process instance = RunningInstance();
if (instance == null)
{
Application.Run(new Form1(args));
}
else
{
HandleRunningInstance(instance, args);
}}private static Process RunningInstance(){
Process current = Process.GetCurrentProcess();
Process[] processes = Process.GetProcessesByName(current.ProcessName);
foreach (Process process in processes)
{
if (process.Id != current.Id)
{
if (Assembly.GetExecutingAssembly().Location.Replace("/", "\\") == current.MainModule.FileName)
{
return process;
}
}
}
return null;}private static void HandleRunningInstance(Process instance, string[] args){
//ShowWindowAsync(instance.MainWindowHandle, 1); //调用api函数，正常显示窗口
//SetForegroundWindow(instance.MainWindowHandle); //将窗口放置最前端
IntPtr handle = FindWindow(null, WindowUtils.getWindowTitle(args[7]));
if (handle == IntPtr.Zero)
{
return;
}
SwitchToThisWindow(handle, true);}