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[英]C - Xlib - BadWindow Error using XGetWindowProperty for window title
[英]Xlib and BadWindow
我正在嘗試使用X11窗口作為抽象像素圖持有人。 它可以工作,但是在嘗試關閉或取消映射窗口時出現BadWindow錯誤。 當我僅調用XPutImage時,一切正常,僅當我嘗試調用XUnmapWindow或XDestroyWindow時,問題才出現。 我檢查了XUnmapWindow和XDestroyWindow的顯示和窗口指針是否正確,但仍無法正常工作。 模塊代碼
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdbool.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <X11/Xlib.h>
#include <X11/extensions/XShm.h>
#include "alienModuleApi.h"
#define MOD_PRIV(p) ((struct modulePrivate*)((p)->modulePrivate))
struct nativeBuffer {
Window window;
XShmSegmentInfo shminfo;
bool shmattached;
XImage *image;
};
struct modulePrivate {
bool initialized;
Display *display;
Visual *visual;
pthread_t thread_id;
volatile int thread_running;
};
static bool threadJob(alienDriverPrivatePtr drvPriv){
struct modulePrivate* modPriv;
int8_t curMode;
printf("Thread job started started\n");
modPriv = drvPriv->modulePrivate;
while (modPriv->thread_running) {
XEvent ev;
if (XPending(modPriv->display)) {
XNextEvent(modPriv->display, &ev);
switch(ev.type) {
case Expose: break;
case ButtonPress:
case KeyPress: exit(0); break;
}
}
}
}
bool screenInitialize(alienDriverPrivatePtr drvPriv){
struct modulePrivate* modPriv;
int8_t curMode;
printf("Screen initializing started\n");
modPriv = drvPriv->modulePrivate = malloc (sizeof(struct modulePrivate));
putenv("DISPLAY=:0");
if(!XInitThreads()) {
printf("XInitThreads() failed\n");
return 0;
}
modPriv->display=XOpenDisplay(NULL);
modPriv->visual=DefaultVisual(modPriv->display, 0);
if(modPriv->visual->class!=TrueColor)
{
fprintf(stderr, "Cannot handle non true color visual ...\n");
return false;
}
drvPriv->randr.modelistClear(drvPriv);
curMode = drvPriv->randr.modelistAddMode(drvPriv, 512, 512);
drvPriv->randr.modelistAddMode(drvPriv, 800, 600);
drvPriv->randr.modeSet(drvPriv, curMode);
modPriv->initialized = 1;
modPriv->thread_running = 1;
pthread_create(&modPriv->thread_id, NULL, threadJob, drvPriv);
printf("Screen initializing finished\n");
return true;
}
alienModuleNativeBuffer screenCreatePixmap(alienDriverPrivatePtr drvPriv, uint16_t width, uint16_t height){
DBG;struct modulePrivate* modPriv = MOD_PRIV(drvPriv);
printf("Creating %dx%d window\n", width, height);
struct nativeBuffer *buf = malloc (sizeof (struct nativeBuffer));
XLockDisplay(modPriv->display);
buf->window=XCreateSimpleWindow(modPriv->display, RootWindow(modPriv->display, 0), 0, 0, width, height, 1, 0, 0);
XSelectInput(modPriv->display, buf->window, ButtonPressMask|ExposureMask|KeyPressMask);
XMapWindow(modPriv->display, buf->window);
buf->image = XShmCreateImage( modPriv->display,
modPriv->visual, 24, ZPixmap, 0,
&buf->shminfo, width, height
);
buf->shminfo.shmid = shmget(IPC_PRIVATE, buf->image->bytes_per_line * buf->image->height,IPC_CREAT|0777);
buf->shminfo.shmaddr = buf->image->data = shmat(buf->shminfo.shmid, 0, 0);
buf->shminfo.readOnly = False;
XShmAttach(modPriv->display, &buf->shminfo);
XUnlockDisplay(modPriv->display);
printf("display is %p\n", modPriv->display);
printf("Created window is %p\n", buf->window);
return (alienModuleNativeBuffer) buf;
}
void *screenLockPixmap(alienDriverPrivatePtr drvPriv, alienModuleNativeBuffer buffer){
struct modulePrivate* modPriv = MOD_PRIV(drvPriv);
struct nativeBuffer *buf = buffer;
if (buf) return buf->image->data;
/* Should never reach this */
return NULL;
}
void screenUnlockPixmap(alienDriverPrivatePtr drvPriv, alienModuleNativeBuffer buffer){
return;
}
void screenDestroyPixmap(alienDriverPrivatePtr drvPriv, void *buf){
struct modulePrivate* modPriv = MOD_PRIV(drvPriv);
if (!buf)
return;
struct nativeBuffer *buffer = buf;
XLockDisplay(modPriv->display);
if (buffer && buffer->shmattached) {
XShmDetach(modPriv->display, &buffer->shminfo);
buffer->shmattached = 0;
}
shmdt(buffer->shminfo.shmaddr);
XFlush(modPriv->display);
XUnmapWindow(modPriv->display, buffer->window);
XDestroyWindow(modPriv->display, buffer->window);
XUnlockDisplay(modPriv->display);
free(buffer);
}
void screenImageUpdate(alienDriverPrivatePtr drvPriv, alienModuleNativeBuffer buffer){
struct modulePrivate* modPriv = MOD_PRIV(drvPriv);
struct nativeBuffer *buf = buffer;
XPutImage(modPriv->display, buf->window, DefaultGC(modPriv->display, 0), buf->image, 0, 0, 0, 0, buf->image->width, buf->image->height);
}
void screenFinalize(alienDriverPrivatePtr drvPriv){
printf("Screen finalizing\n");
struct modulePrivate* modPriv = MOD_PRIV(drvPriv);
if (!modPriv->initialized) return;
//screenDestroyPixmap(drvPriv, modPriv->image->data);
modPriv->thread_running = 0;
XCloseDisplay(modPriv->display);
free(modPriv);
printf("Screen finalized\n");
}
alienModuleFunctions_t moduleFuncs = {
.screen.initialize = screenInitialize,
.screen.createNativeBuffer = screenCreatePixmap,
.screen.lockNativeBuffer = screenLockPixmap,
.screen.unlockNativeBuffer = screenUnlockPixmap,
.screen.releaseNativeBuffer = screenDestroyPixmap,
.screen.imageUpdate = screenImageUpdate,
.screen.finalize = screenFinalize,
};
alienModuleFunctionsPtr alienModuleInitialize (alienDriverPrivatePtr drvPriv){
printf("Debuging X11 module loaded\n");
return &moduleFuncs;
}
錯誤
X Error of failed request: BadWindow (invalid Window parameter)
Major opcode of failed request: 10 (X_UnmapWindow)
Resource id in failed request: 0x4a00003
Serial number of failed request: 7
Current serial number in output stream: 12
將來,我相信您應該提供僅包含相關行而不是整個文件的簡短代碼段。 它使其他人更容易發現問題或自己測試代碼。
無論如何,如果未定義窗口(即已銷毀或從未創建),則XUnmapWindow將拋出BadWindow。
我仔細檢查了一下您的代碼,如果我猜想我會說您兩次調用screenDestroyPixmap
(我看不到在哪里screenDestroyPixmap
或moduleFuncs.screen.releaseNativeBuffer
所以我無法確認)
請記住,XLib是異步的,因此在報告該錯誤之后很可能會發生。 有關解決方案,請參見XSync 。 或者,您可能要考慮XCB ; 它的定義功能之一是能夠檢查您運行的每個X調用是否存在錯誤。 它的另一項簡潔功能是可以同時使用XLib和XCB,因此您可以在選擇呼叫時獲得xcb的所有好處。
並沒有真正回答您的問題,但我希望我能有所幫助,但不要太籠統。
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