는 "XCB 라이브러리와 기본 그래픽 프로그래밍"에서 코드에서 "신고되지 않은 '문자열'"

Question

여기에 문제가 발생하는 코드였다 WM_NAME 및 WM_ICON_NAME 어디서나 정의되지 않았기 때문에

#include <string.h> 
#include <xcb/xcb.h> 
#include <xcb/xcb_atom.h> 

int main() 
{ 
    xcb_connection_t *c; 
    xcb_screen_t  *screen; 
    xcb_window_t  win; 
    char    *title = "Hello World !"; 
    char    *title_icon = "Hello World ! (iconified)"; 



    /* Open the connection to the X server */ 
    c = xcb_connect (NULL, NULL); 

    /* Get the first screen */ 
    screen = xcb_setup_roots_iterator (xcb_get_setup (c)).data; 

    /* Ask for our window's Id */ 
    win = xcb_generate_id (c); 

    /* Create the window */ 
    xcb_create_window (c,        /* Connection   */ 
        0,        /* depth    */ 
        win,       /* window Id   */ 
        screen->root,     /* parent window  */ 
        0, 0,       /* x, y    */ 
        250, 150,      /* width, height  */ 
        10,       /* border_width  */ 
        XCB_WINDOW_CLASS_INPUT_OUTPUT, /* class    */ 
        screen->root_visual,   /* visual    */ 
        0, NULL);      /* masks, not used  */ 

    /* Set the title of the window */ 
    xcb_change_property (c, XCB_PROP_MODE_REPLACE, win, 
         WM_NAME, STRING, 8, 
         strlen (title), title); 

    /* fixed it by replacing WM_NAME with XCB_ATOM_WM_NAME 
    and replacing STRING with XCB_ATOM_STRING */ 

    /* Set the title of the window icon */ 
    xcb_change_property (c, XCB_PROP_MODE_REPLACE, win, 
         WM_ICON_NAME, STRING, 8, 
         strlen(title_icon), title_icon); 

    /* fixed this by replacing WM_ICON_NAME with XCB_ATOM_ICON_NAME 
    and replacing STRING with XCB_ATOM_STRING */ 

    /* Map the window on the screen */ 
    xcb_map_window (c, win); 

    xcb_flush (c); 

    while (1) {} 

    return 0; 
} 

GCC 오류가 생성 된 ; XCB_ATOM_ 앞에 붙여야합니다. 그 해결책은 포럼 게시물을 온라인으로 읽거나 xproto.h를 읽는 것으로 발견했습니다.

그러나 STRING은 어디에도 정의되어 있지 않습니다. string.h를 검색했습니다. STRING이 발견 된 유일한 사례는 논평에있었습니다. STRING을 문자열로 변경하려고 시도했지만 여전히 컴파일되지 않습니다.

$ gcc -Wall -o win-icon-name win-icon-name.c -lxcb 
win-icon-name.c: In function ‘main’: 
win-icon-name.c:40:42: error: ‘string’ undeclared (first use in this function) 
         XCB_ATOM_WM_NAME, string, 8, 
             ^
win-icon-name.c:40:42: note: each undeclared identifier is reported only once for each function it appears in 

"STRING"앞에 "XCB_ATOM_"을 넣어서 문제를 해결했으며 잘 컴파일되었습니다.

Answer 1

클 리 포드 (Clifford)가 제안했듯이 여기에 고정 코드가있는 별도의 게시물이 있습니다.

#include <string.h> 
#include <xcb/xcb.h> 
#include <xcb/xcb_atom.h> 

int main() 
{ 
    xcb_connection_t *c; 
    xcb_screen_t  *screen; 
    xcb_window_t  win; 
    char    *title = "Hello World !"; 
    char    *title_icon = "Hello World ! (iconified)"; 



    /* Open the connection to the X server */ 
    c = xcb_connect (NULL, NULL); 

    /* Get the first screen */ 
    screen = xcb_setup_roots_iterator (xcb_get_setup (c)).data; 

    /* Ask for our window's Id */ 
    win = xcb_generate_id (c); 

    /* Create the window */ 
    xcb_create_window (c,        /* Connection   */ 
        0,        /* depth    */ 
        win,       /* window Id   */ 
        screen->root,     /* parent window  */ 
        0, 0,       /* x, y    */ 
        250, 150,      /* width, height  */ 
        10,       /* border_width  */ 
        XCB_WINDOW_CLASS_INPUT_OUTPUT, /* class    */ 
        screen->root_visual,   /* visual    */ 
        0, NULL);      /* masks, not used  */ 

    /* Set the title of the window */ 
    xcb_change_property (c, XCB_PROP_MODE_REPLACE, win, 
         XCB_ATOM_WM_NAME, XCB_ATOM_STRING, 8, 
         strlen (title), title); 

    /* Set the title of the window icon */ 
    xcb_change_property (c, XCB_PROP_MODE_REPLACE, win, 
         XCB_ATOM_WM_ICON_NAME, XCB_ATOM_STRING, 8, 
         strlen(title_icon), title_icon); 

    /* Map the window on the screen */ 
    xcb_map_window (c, win); 

    xcb_flush (c); 

    while (1) {} 

    return 0; 
}