我在OSX上运行brew install allegro
遵循本教程： https : //wiki.allegro.cc/index.php?title=Example_ExHello
我的代码
include <allegro.h> int main(void) { if (allegro_init() != 0) return 1; /* set up the keyboard handler */ install_keyboard(); /* set a graphics mode sized 320x200 */ if (set_gfx_mode(GFX_AUTODETECT, 320, 200, 0, 0) != 0) { if (set_gfx_mode(GFX_SAFE, 320, 200, 0, 0) != 0) { set_gfx_mode(GFX_TEXT, 0, 0, 0, 0); allegro_message("Unable to set any graphic mode\n%s\n", allegro_error); return 1; } } /* set the color palette */ set_palette(desktop_palette); /* clear the screen to white */ clear_to_color(screen, makecol(255, 255, 255)); /* you don't need to do this, but on some platforms (eg. Windows) things * will be drawn more quickly if you always acquire the screen before * trying to draw onto it. */ acquire_screen(); /* write some text to the screen with black letters and transparent background */ textout_centre_ex(screen, font, "Hello, world!", SCREEN_W/2, SCREEN_H/2, makecol(0,0,0), -1); /* you must always release bitmaps before calling any input functions */ release_screen(); /* wait for a keypress */ readkey(); return 0; } 1.c:1:1: error: unknown type name 'include' include <allegro.h> ^ 1.c:1:9: error: expected identifier or '(' include <allegro.h> ^ 2 errors generated. make: *** [1] Error 1I ran brew install allegro on OSX
following this tutorial: https://wiki.allegro.cc/index.php?title=Example_ExHello
my code
include <allegro.h> int main(void) { if (allegro_init() != 0) return 1; /* set up the keyboard handler */ install_keyboard(); /* set a graphics mode sized 320x200 */ if (set_gfx_mode(GFX_AUTODETECT, 320, 200, 0, 0) != 0) { if (set_gfx_mode(GFX_SAFE, 320, 200, 0, 0) != 0) { set_gfx_mode(GFX_TEXT, 0, 0, 0, 0); allegro_message("Unable to set any graphic mode\n%s\n", allegro_error); return 1; } } /* set the color palette */ set_palette(desktop_palette); /* clear the screen to white */ clear_to_color(screen, makecol(255, 255, 255)); /* you don't need to do this, but on some platforms (eg. Windows) things * will be drawn more quickly if you always acquire the screen before * trying to draw onto it. */ acquire_screen(); /* write some text to the screen with black letters and transparent background */ textout_centre_ex(screen, font, "Hello, world!", SCREEN_W/2, SCREEN_H/2, makecol(0,0,0), -1); /* you must always release bitmaps before calling any input functions */ release_screen(); /* wait for a keypress */ readkey(); return 0; } 1.c:1:1: error: unknown type name 'include' include <allegro.h> ^ 1.c:1:9: error: expected identifier or '(' include <allegro.h> ^ 2 errors generated. make: *** [1] Error 1最满意答案
假定include <allegro.h>的打字错误应该是#include <allegro.h> ，您已经安装了allegro5 - 在allegro4（本例来自这个例子）和allegro5之间，API非常不同。 allegro5的显示初始化示例程序显示了一些差异：
#include <stdio.h> #include <allegro5/allegro.h> int main(int argc, char **argv){ ALLEGRO_DISPLAY *display = NULL; if(!al_init()) { // allegro_init in allegro4 fprintf(stderr, "failed to initialize allegro!\n"); return -1; } display = al_create_display(640, 480); // very different to allegro4 if(!display) { fprintf(stderr, "failed to create display!\n"); return -1; } al_clear_to_color(al_map_rgb(0,0,0)); // makecol -> al_map_rgb, clear_to_color -> al_clear_to_color al_flip_display(); al_rest(10.0); al_destroy_display(display); return 0; }我使用它来构建它：
c++ -I/usr/local/include allegro_display.cc -o allegro_display -L/usr/local/lib -lallegro -lallegro_main代码位于文件allegro_display.cc 。 请注意，我使用C ++编译器进行编译，因为allegro实际上是一个C ++ api（并且当编译为C代码时，该示例不起作用，因为C中没有适当的调用约定，而C ++中有）
Presuming that the typo of doing include <allegro.h> was supposed to be #include <allegro.h>, You've installed allegro5 - the API is very different between allegro4 (which this example is from) and allegro5. The display initialization sample program for allegro5 shows some of the differences:
#include <stdio.h> #include <allegro5/allegro.h> int main(int argc, char **argv){ ALLEGRO_DISPLAY *display = NULL; if(!al_init()) { // allegro_init in allegro4 fprintf(stderr, "failed to initialize allegro!\n"); return -1; } display = al_create_display(640, 480); // very different to allegro4 if(!display) { fprintf(stderr, "failed to create display!\n"); return -1; } al_clear_to_color(al_map_rgb(0,0,0)); // makecol -> al_map_rgb, clear_to_color -> al_clear_to_color al_flip_display(); al_rest(10.0); al_destroy_display(display); return 0; }I built it using:
c++ -I/usr/local/include allegro_display.cc -o allegro_display -L/usr/local/lib -lallegro -lallegro_mainwhere the code was in the file allegro_display.cc. Note that I compile using the C++ compiler, because allegro is really a C++ api (and the sample does not work when compiled as C code because there is no proper calling convention for structs in C, whereas there is for C++)
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