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1
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2 /* Simple program: Loop, watching keystrokes
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3 Note that you need to call SDL_PollEvent() or SDL_WaitEvent() to
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4 pump the event loop and catch keystrokes.
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5 */
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6
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7 #include <stdio.h>
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8 #include <stdlib.h>
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9 #include <string.h>
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10
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11 #include "SDL.h"
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12
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13 static void print_modifiers(void)
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14 {
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15 int mod;
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16 printf(" modifiers:");
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17 mod = SDL_GetModState();
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18 if(!mod) {
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19 printf(" (none)");
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20 return;
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21 }
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22 if(mod & KMOD_LSHIFT)
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23 printf(" LSHIFT");
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24 if(mod & KMOD_RSHIFT)
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25 printf(" RSHIFT");
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26 if(mod & KMOD_LCTRL)
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27 printf(" LCTRL");
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28 if(mod & KMOD_RCTRL)
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29 printf(" RCTRL");
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30 if(mod & KMOD_LALT)
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31 printf(" LALT");
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32 if(mod & KMOD_RALT)
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33 printf(" RALT");
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34 if(mod & KMOD_LMETA)
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35 printf(" LMETA");
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36 if(mod & KMOD_RMETA)
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37 printf(" RMETA");
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38 if(mod & KMOD_NUM)
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39 printf(" NUM");
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40 if(mod & KMOD_CAPS)
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41 printf(" CAPS");
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42 if(mod & KMOD_MODE)
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43 printf(" MODE");
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44 }
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45
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46 static void PrintKey(SDL_keysym *sym, int pressed)
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47 {
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48 /* Print the keycode, name and state */
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49 if ( sym->sym ) {
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50 printf("Key %s: %d-%s ", pressed ? "pressed" : "released",
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51 sym->sym, SDL_GetKeyName(sym->sym));
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52 } else {
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53 printf("Unknown Key (scancode = %d) %s ", sym->scancode,
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54 pressed ? "pressed" : "released");
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55 }
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56
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57 /* Print the translated character, if one exists */
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58 if ( sym->unicode ) {
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59 /* Is it a control-character? */
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60 if ( sym->unicode < ' ' ) {
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61 printf(" (^%c)", sym->unicode+'@');
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62 } else {
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63 #ifdef UNICODE
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64 printf(" (%c)", sym->unicode);
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65 #else
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66 /* This is a Latin-1 program, so only show 8-bits */
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67 if ( !(sym->unicode & 0xFF00) )
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68 printf(" (%c)", sym->unicode);
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69 #endif
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70 }
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71 }
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72 print_modifiers();
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73 printf("\n");
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74 }
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75
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76 int main(int argc, char *argv[])
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77 {
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78 SDL_Event event;
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79 int done;
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80
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81 /* Initialize SDL */
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82 if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) {
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83 fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError());
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84 exit(1);
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85 }
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86 atexit(SDL_Quit);
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87
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88 /* Set 640x480 video mode */
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89 if ( SDL_SetVideoMode(640, 480, 0, SDL_SWSURFACE) == NULL ) {
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90 fprintf(stderr, "Couldn't set 640x480 video mode: %s\n",
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91 SDL_GetError());
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92 exit(2);
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93 }
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94
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95 /* Enable UNICODE translation for keyboard input */
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96 SDL_EnableUNICODE(1);
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97
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98 /* Enable auto repeat for keyboard input */
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99 SDL_EnableKeyRepeat(SDL_DEFAULT_REPEAT_DELAY,
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100 SDL_DEFAULT_REPEAT_INTERVAL);
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101
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102 /* Watch keystrokes */
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103 done = 0;
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104 while ( !done ) {
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105 /* Check for events */
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106 SDL_WaitEvent(&event);
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107 switch (event.type) {
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108 case SDL_KEYDOWN:
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109 PrintKey(&event.key.keysym, 1);
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110 break;
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111 case SDL_KEYUP:
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112 PrintKey(&event.key.keysym, 0);
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113 break;
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114 case SDL_MOUSEBUTTONDOWN:
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115 /* Any button press quits the app... */
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116 case SDL_QUIT:
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117 done = 1;
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118 break;
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119 default:
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120 break;
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121 }
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122 }
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123 return(0);
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124 }
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