我正在尝试将X11窗口用作抽象像素图持有人。它可以工作，但是在尝试关闭或取消映射窗口时出现BadWindow错误。当我仅调用XPutImage时，一切正常，仅当我尝试调用XUnmapWindow或XDestroyWindow时，问题才出现。我检查了XUnmapWindow和XDestroyWindow的显示和窗口指针是否正确，但仍无法正常工作。模块代码
#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;
}
错误
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
答案 0 :(得分：0)
将来，我相信您应该提供仅包含相关行而不是整个文件的简短代码段。它使其他人更容易发现问题或自己测试代码。
无论如何，如果未定义窗口（即已经销毁或从未创建），XUnmapWindow将抛出BadWindow。
我仔细检查了您的代码，如果我猜想我会说您两次致电screenDestroyPixmap（我看不到曾经在哪里呼叫screenDestroyPixmap或moduleFuncs.screen.releaseNativeBuffer，所以我无法确认）
请记住，XLib是异步的，因此在报告错误之后很可能会发生。有关解决方案，请参见XSync。另外，您可能需要考虑使用XCB；它的定义功能之一是能够检查您运行的每个X调用是否存在错误。它的另一项出色功能是使用XLib and XCB together的功能，因此您可以在选择呼叫时获得xcb的所有好处。
并没有真正回答您的问题，但是我希望我能提供帮助而不会太笼统。