如何在Windows 7中使用.NET Windows服务显示消息框
我们有一个Windows服务,用于在Windows XP上用户扫描其访问卡后显示确认消息框,但一旦我们迁移到Windows 7,该弹出功能就不再起作用。如此帖子所述Displaying Message Box using .NET Windows Services In Windows 7,我按照说明操作,当我将应用程序运行为控制台应用程序时,它可以正常工作,但是当我将其安装为Windows服务时,它无法工作。以下是我的代码。同时,result变量返回false,err变量返回5。
class Class1
{
public static IntPtr WTS_CURRENT_SERVER_HANDLE = IntPtr.Zero;
public static int WTS_CURRENT_SESSION = -1;
public void test()
{
bool result = false;
string title = "Hello";
int tlen = title.Length;
string msg = "Terminal Service!";
int mlen = msg.Length;
int resp = 0;
result = WTSSendMessage(WTS_CURRENT_SERVER_HANDLE, WTS_CURRENT_SESSION, title, tlen, msg, mlen, 0, 0, out resp, true);
int err = Marshal.GetLastWin32Error();
System.Console.WriteLine("result:{0}, errorCode:{1}, response:{2}", result, err, resp);
}
[DllImport("wtsapi32.dll", SetLastError = true)]
static extern bool WTSSendMessage(
IntPtr hServer,
[MarshalAs(UnmanagedType.I4)] int SessionId,
String pTitle,
[MarshalAs(UnmanagedType.U4)] int TitleLength,
String pMessage,
[MarshalAs(UnmanagedType.U4)] int MessageLength,
[MarshalAs(UnmanagedType.U4)] int Style,
[MarshalAs(UnmanagedType.U4)] int Timeout,
[MarshalAs(UnmanagedType.U4)] out int pResponse,
bool bWait);
[DllImport("Kernel32.dll", SetLastError = true)]
static extern int WTSGetActiveConsoleSessionID();
}