X11 XImage Manipulation

Question

Ich versuche, ein Bild von meinem brandneuen Fenster aufzunehmen und es dann zum selben Fenster zurück zu ziehen, nur um auf XLib zu trainieren.

Hier ist mein Code:

#include<stdio.h> 
#include<stdlib.h> 
#include<stdint.h> 
#include<X11/Xlib.h> 
#include<X11/Xutil.h> 
#include<sys/stat.h> 
#include<sys/time.h> 
#include<sys/types.h> 
#include<unistd.h> 

int main(int argc, char *argv[]) { 
    fd_set eventset; 
    fd_set zeroset; 
// struct timeval timeout = {0, 0}; 

    Display *display = 0; 
    int screen; 
    Window wnd; 
    XVisualInfo vinfo; 
    XSetWindowAttributes attr; 
    XEvent event; 
    XImage *bg; 

    Atom WM_message[2]; 

    int run = 1; 

    FD_ZERO(&eventset); 
    FD_ZERO(&zeroset); 

    if(!(display = XOpenDisplay(0))) { 
     /* Display not found */ 
     printf("Fail display.\n"); 
     return 0; 
    } 

    screen = XDefaultScreen(display); 

    if(!XMatchVisualInfo(display, screen, 32, TrueColor, &vinfo)) { 
     if(!XMatchVisualInfo(display, screen, 24, TrueColor, &vinfo)) { 
      /* No proper color depth available */ 
      XCloseDisplay(display); /* Close X communication */ 
      printf("No found color display. Sorry.\n"); 
      return 0; 
     } 
    } 

    attr.colormap = XCreateColormap(display, DefaultRootWindow(display), vinfo.visual, AllocNone); 
    attr.border_pixel = 0; 
    attr.background_pixel = 0x80000000; 
    attr.bit_gravity = NorthWestGravity; 
    attr.win_gravity = NorthWestGravity; 

    wnd = XCreateWindow(display, DefaultRootWindow(display), 0, 0, 300, 300, 0, 
     vinfo.depth, InputOutput, vinfo.visual, 
     CWColormap | CWBorderPixel | CWBackPixel | CWBitGravity | CWWinGravity, &attr); 

    /* Subscribe to window closing event */ 
    WM_message[0] = XInternAtom(display, "WM_PROTOCOLS", 1); 
    WM_message[1] = XInternAtom(display, "WM_DELETE_WINDOW", 1); 
    XSetWMProtocols(display, wnd, WM_message, 2); 

    XFreeColormap(display, attr.colormap); 
    XSelectInput(display, wnd, ExposureMask | ButtonPressMask | KeyPressMask); 

    XMapWindow(display, wnd); 

    bg = XGetImage(display, XDefaultRootWindow(display), 0, 0, 300, 300, AllPlanes, ZPixmap); 
// bg = XGetImage(display, wnd, 100, 100, 100, 100, AllPlanes, ZPixmap); 
/* int x; 
    for(x = 0; x < 10000; x++) { 
     bg->data[x] = 0x80; 
    } */ 
    XPutImage(display, wnd, XDefaultGC(display, screen), bg, 0, 0, 0, 0, 300, 300); 
// XPutImage(display, wnd, XDefaultGC(display, screen), bg, 100, 100, 100, 100, 100, 100); 

    XMapWindow(display, wnd); 
    XFlush(display); 

    while(run) { 
     XNextEvent(display, &event); 
     switch(event.type) { 
      case Expose: 
       printf("w = %d, h = %d\n", event.xexpose.width, event.xexpose.height);    
       break; 

      case DestroyNotify: 
       run = 0; 
       break; 

      case ClientMessage: 
       { 
        if(event.xclient.message_type == WM_message[0]) { 
         if(event.xclient.data.l[0] == WM_message[1]) { 
          run = 0; 
         } 
        } 
       } 
      default:; 
      } 
    } 
    XDestroyImage(bg); 
    XDestroyWindow(display, wnd); 
    XCloseDisplay(display); 

    return 0; 
} 

Dieser Absturz mein Programm entweder auf Porteus und MobaXterm.

Aber diese Zeilen:

// bg = XGetImage(display, wnd, 100, 100, 100, 100, AllPlanes, ZPixmap); 
/* int x; 
    for(x = 0; x < 10000; x++) { 
     bg->data[x] = 0x80; 
    } */ 
// XPutImage(display, wnd, XDefaultGC(display, screen), bg, 100, 100, 100, 100, 100, 100); 

Ist mein Programm nicht abstürzen ... es einfach nichts machen.

Kann mir jemand helfen zu verstehen, warum experimentiere ich dieses seltsame Verhalten von X?

Dies sind die Fehlermeldung erhalte mir:

X Fehler gescheiterten Anfrage: BadMatch (ungültige Parameter Attribute) Haupt Opcode gescheiterten Anfrage: 72 (X_PutImage) Seriennummer von fehlgeschlagen Anfrage: 16 aktuelle Seriennummer im Ausgabestrom: 18

Answer 1

Nach weiterem reasearches und versucht, finde ich finnally 2 Fakten:

Zuerst mein Beitrag irrt: 012.351.dies nicht abstürzt:

XPutImage(display, XDefaultRootWindow(display), XDefaultGC(display, screen), bg, 100, 100, 100, 100, 100, 100); 

Diejenigen Linien Absturz:

XPutImage(display, wnd, XDefaultGC(display, screen), bg, 0, 0, 0, 0, 300, 300); 
XPutImage(display, wnd, XDefaultGC(display, screen), bg, 100, 100, 100, 100, 100, 100); 

Zweitens:

Schreiben auf Root-Fenster mit Standard gc ist in Ordnung, da Standard-gc ein gc auf den Standard entspricht, Root-Fenster.

Aber die Verwendung dieses GC für mein eigenes Fenster ist ein Fehler, da ich Farbtiefe verwendet, die von Root-Fenster abweichen kann.

So habe ich jetzt das läuft gut:

#include<stdio.h> 
#include<stdlib.h> 
#include<stdint.h> 
#include<X11/Xlib.h> 
#include<X11/Xutil.h> 
#include<sys/stat.h> 
#include<sys/time.h> 
#include<sys/types.h> 
#include<unistd.h> 

int main(int argc, char *argv[]) { 
    fd_set eventset; 
    fd_set zeroset; 
// struct timeval timeout = {0, 0}; 

    Display *display = 0; 
    int screen; 
    Window wnd; 
    XVisualInfo vinfo; 
    XSetWindowAttributes attr; 
    XEvent event; 
    XImage *bg; 
    GC mainGC; 

    Atom WM_message[2]; 

    int run = 1; 

    FD_ZERO(&eventset); 
    FD_ZERO(&zeroset); 

    if(!(display = XOpenDisplay(0))) { 
     /* Display not found */ 
     printf("Fail display.\n"); 
     return 0; 
    } 

    screen = XDefaultScreen(display); 

    if(!XMatchVisualInfo(display, screen, 32, TrueColor, &vinfo)) { 
     if(!XMatchVisualInfo(display, screen, 24, TrueColor, &vinfo)) { 
      /* No proper color depth available */ 
      XCloseDisplay(display); /* Close X communication */ 
      printf("No found color display. Sorry.\n"); 
      return 0; 
     } 
    } 

    attr.colormap = XCreateColormap(display, DefaultRootWindow(display), vinfo.visual, AllocNone); 
    attr.border_pixel = 0; 
    attr.background_pixel = 0x80000000; 
    attr.bit_gravity = NorthWestGravity; 
    attr.win_gravity = NorthWestGravity; 

    wnd = XCreateWindow(display, DefaultRootWindow(display), 0, 0, 300, 300, 0, 
     vinfo.depth, InputOutput, vinfo.visual, 
     CWColormap | CWBorderPixel | CWBackPixel | CWBitGravity | CWWinGravity, &attr); 

    /* Subscribe to window closing event */ 
    WM_message[0] = XInternAtom(display, "WM_PROTOCOLS", 1); 
    WM_message[1] = XInternAtom(display, "WM_DELETE_WINDOW", 1); 
    XSetWMProtocols(display, wnd, WM_message, 2); 

    XFreeColormap(display, attr.colormap); 
    XSelectInput(display, wnd, ExposureMask | ButtonPressMask | KeyPressMask); 

    XMapWindow(display, wnd); 
    XFlush(display); 

    mainGC = XCreateGC(display, wnd, 0, 0); 

    bg = XGetImage(display, wnd, 0, 0, 100, 100, AllPlanes, ZPixmap); 
    int x; 
    for(x = 0; x < 10000; x++) { 
     bg->data[x] = 0x80; 
    } 
    XPutImage(display, wnd, mainGC, bg, 0, 0, 100, 100, 100, 100); 

    while(run) { 
     XNextEvent(display, &event); 
     switch(event.type) { 
      case Expose: 
       printf("w = %d, h = %d\n", event.xexpose.width, event.xexpose.height);    
       break; 

      case DestroyNotify: 
       run = 0; 
       break; 

      case ClientMessage: 
       { 
        if(event.xclient.message_type == WM_message[0]) { 
         if(event.xclient.data.l[0] == WM_message[1]) { 
          run = 0; 
         } 
        } 
       } 
      default:; 
      } 
    } 
    XDestroyImage(bg); 
    XDestroyWindow(display, wnd); 
    XCloseDisplay(display); 

    return 0; 
}