I've been searching around, and I haven't found how I would do this from C#.
I was wanting to make it so I could tell Google Chrome to go Forward, Back, Open New Tab, Close Tab, Open New Window, and Close Window from my C# application.
I did something similar with WinAmp using
[DllImport("user32", EntryPoint = "SendMessageA")] private static extern int SendMessage(int Hwnd, int wMsg, int wParam, int lParam);
and a a few others. But I don't know what message to send or how to find what window to pass it to, or anything.
So could someone show me how I would send those 6 commands to Chrome from C#? thanks
Ok, I'm getting voted down, so maybe I wasn't clear enough, or people are assuming I didn't try to figure this out on my own.
First off, I'm not very good with the whole DllImport stuff. I'm still learning how it all works.
I found how to do the same idea in winamp a few years ago, and I was looking at my code. I made it so I could skip a song, go back, play, pause, and stop winamp from my C# code. I started by importing:
[DllImport("user32.dll", CharSet = CharSet.Auto)] public static extern IntPtr FindWindow([MarshalAs(UnmanagedType.LPTStr)] string lpClassName, [MarshalAs(UnmanagedType.LPTStr)] string lpWindowName); [DllImport("user32.dll", CharSet = CharSet.Auto)] static extern int SendMessageA(IntPtr hwnd, int wMsg, int wParam, uint lParam); [DllImport("user32.dll", CharSet = System.Runtime.InteropServices.CharSet.Auto)] public static extern int GetWindowText(IntPtr hwnd, string lpString, int cch); [DllImport("user32", EntryPoint = "FindWindowExA")] private static extern int FindWindowEx(int hWnd1, int hWnd2, string lpsz1, string lpsz2); [DllImport("user32", EntryPoint = "SendMessageA")] private static extern int SendMessage(int Hwnd, int wMsg, int wParam, int lParam);
Then the code I found to use this used these constants for the messages I send.
const int WM_COMMAND = 0x111; const int WA_NOTHING = 0; const int WA_PREVTRACK = 40044; const int WA_PLAY = 40045; const int WA_PAUSE = 40046; const int WA_STOP = 40047; const int WA_NEXTTRACK = 40048; const int WA_VOLUMEUP = 40058; const int WA_VOLUMEDOWN = 40059; const int WINAMP_FFWD5S = 40060; const int WINAMP_REW5S = 40061;
I would get the hwnd (the program to send the message to) by:
IntPtr hwnd = FindWindow(m_windowName, null);
then I would send a message to that program:
SendMessageA(hwnd, WM_COMMAND, WA_STOP, WA_NOTHING);
I assume that I would do something very similar to this for Google Chrome. but I don't know what some of those values should be, and I googled around trying to find the answer, but I couldn't, which is why I asked here. So my question is how do I get the values for:
m_windowName and WM_COMMAND
and then, the values for the different commands, forward, back, new tab, close tab, new window, close window?