user32 - how to press and hold a key C# -

what trying accomplish in console program able press , hold key, using user32.dll. know not sending extended key. dont think sending scancode right either. , think passing right flag hold key.. know have key up. of right need key pushed down. appreciated, of right code below not work

using system; using system.collections.generic; using system.linq; using system.runtime.interopservices; using system.text; using system.threading; using system.threading.tasks;  namespace pressand_hold { class program {     [dllimport("user32.dll")]     public static extern void keybd_event(byte bvk, byte bscan, uint dwflags, uint dwextrainfo);      const int vk_up = 0x26; //up key     const int vk_down = 0x28;  //down key     const int vk_left = 0x25;     const int vk_right = 0x27;     const uint keyeventf_keyup = 0x0002;     const uint scancode = 0x0008;     const int key_0 = 11;      internal enum scancodeshort : short     {          key_9 = 10,         key_a = 30,         key_b = 48,         key_c = 46,         key_d = 32,         key_e = 18,         key_f = 33,         key_g = 34,         key_h = 35,         key_i = 23,         key_j = 36,         key_k = 37,         key_l = 38,         key_m = 50,         key_n = 49,         key_o = 24,         key_p = 25,         key_q = 16,         key_r = 19,         key_s = 31,         key_t = 20,         key_u = 22,         key_v = 47,         key_w = 17,         key_x = 45,         key_y = 21,         key_z = 44,     }      static void main(string[] args)     {         thread.sleep(2000);         // push v key        keybd_event((byte)scancodeshort.key_v, 0x45, 0, 0);       // release v key        keybd_event((byte)scancodeshort.key_v, 0x45, keyeventf_keyup, 0);        console.writeline("done");              console.read();     } } } 

2nd , 3rd arguments of keybd_event wrong.

take pinvoke definition , msdn

2nd argument should 0x45

3rd argument cannot 8. must 0 push key.

may :

static void main(string[] args) {     thread.sleep(2000);     // push v key     keybd_event((byte)scancodeshort.key_v, 0x45, 0, 0);      console.writeline("done");     console.read(); } 

a scancode nothing else visual representation of string (numbers or alphanumerics).

be careful code. 47 0x2f en hexa, , vk_help in virtual key codes

key_v = 86, 

* complete code *

using system; using system.runtime.interopservices; using system.threading;  namespace pressand_hold {     internal class program     {         internal enum scancodeshort : short         {             key_0 = 48,             key_1,             key_2,             key_3,             key_4,             key_5,             key_6,             key_7,             key_8,             key_9,             key_a = 65,             key_b,             key_c,             key_d,             key_e,             key_f,             key_g,             key_h,             key_i,             key_j,             key_k,             key_l,             key_m,             key_n,             key_o,             key_p,             key_q,             key_r,             key_s,             key_t,             key_u,             key_v,             key_w,             key_x,             key_y,             key_z,         }          [dllimport("user32.dll")]         public static extern void keybd_event(byte bvk, byte bscan, uint dwflags, uint dwextrainfo);          private static void main(string[] args)         {             thread.sleep(2000);              keybd_event((byte)scancodeshort.key_v, 0x45, 0, 0);              console.writeline("done");             console.read();         }     } } 

to hold key, use loop (while(), for(), etc...)