C++ JNU_ReleaseStringPlatformChars函数代码示例

/*
 * Class:     sun_tools_attach_BSDVirtualMachine
 * Method:    createAttachFile
 * Signature: (Ljava.lang.String;)V
 */
JNIEXPORT void JNICALL Java_sun_tools_attach_BsdVirtualMachine_createAttachFile(JNIEnv *env, jclass cls, jstring path)
{
    const char* _path;
    jboolean isCopy;
    int fd, rc;

    _path = GetStringPlatformChars(env, path, &isCopy);
    if (_path == NULL) {
        JNU_ThrowIOException(env, "Must specify a path");
        return;
    }

    RESTARTABLE(open(_path, O_CREAT | O_EXCL, S_IWUSR | S_IRUSR), fd);
    if (fd == -1) {
        /* release p here before we throw an I/O exception */
        if (isCopy) {
            JNU_ReleaseStringPlatformChars(env, path, _path);
        }
        JNU_ThrowIOExceptionWithLastError(env, "open");
        return;
    }

    RESTARTABLE(chown(_path, geteuid(), getegid()), rc);

    RESTARTABLE(close(fd), rc);

    /* release p here */
    if (isCopy) {
        JNU_ReleaseStringPlatformChars(env, path, _path);
    }
}

JNIEXPORT jint JNICALL
Java_sun_print_Win32PrintService_getCopiesSupported(JNIEnv *env,
                                                    jobject peer,
                                                    jstring printer,
                                                    jstring port)
{
  LPTSTR printerName = (LPTSTR)JNU_GetStringPlatformChars(env, printer, NULL);
  LPTSTR printerPort = (LPTSTR)JNU_GetStringPlatformChars(env, port, NULL);

  if (printerName == NULL || printerPort == NULL) {
      if (printerName != NULL) {
          JNU_ReleaseStringPlatformChars(env, printer, printerName);
      }
      if (printerPort != NULL) {
          JNU_ReleaseStringPlatformChars(env, port, printerPort);
      }
      return 1;
  }

  SAVE_CONTROLWORD
  int numCopies = ::DeviceCapabilities(printerName, printerPort,
                                       DC_COPIES,   NULL, NULL);
  RESTORE_CONTROLWORD

  if (numCopies == -1)
    return 1; // default

  JNU_ReleaseStringPlatformChars(env, printer, printerName);
  JNU_ReleaseStringPlatformChars(env, port, printerPort);

  return numCopies;
}

/*
PostScript Drivers return wrong support info for the following code:

 DWORD dmFields = (::DeviceCapabilities(printerName,
                                         NULL, DC_FIELDS,   NULL, NULL)) ;

  if ((dmFields & DM_YRESOLUTION) )
    isSupported = true;

Returns not supported even if it supports resolution. Therefore, we use the
function _getAllResolutions.
*/
JNIEXPORT jintArray JNICALL
Java_sun_print_Win32PrintService_getAllResolutions(JNIEnv *env,
                                                   jobject peer,
                                                   jstring printer,
                                                   jstring port)
{
  LPTSTR printerName = (LPTSTR)JNU_GetStringPlatformChars(env, printer, NULL);
  LPTSTR printerPort = (LPTSTR)JNU_GetStringPlatformChars(env, port, NULL);

 if (printerName == NULL || printerPort == NULL) {
      if (printerName != NULL) {
          JNU_ReleaseStringPlatformChars(env, printer, printerName);
      }
      if (printerPort != NULL) {
          JNU_ReleaseStringPlatformChars(env, port, printerPort);
      }
      return NULL;
  }

  SAVE_CONTROLWORD
  int nResolutions = ::DeviceCapabilities(printerName, printerPort,
                                          DC_ENUMRESOLUTIONS, NULL, NULL);
  RESTORE_CONTROLWORD

  jintArray resolutionArray = NULL;
  if (nResolutions > 0) {
    resolutionArray = env->NewIntArray(nResolutions*2);
    if (resolutionArray != NULL) {
        jint *jpcIndices = env->GetIntArrayElements(resolutionArray, NULL);
        if (jpcIndices != NULL) {
            jint *saveFormats = jpcIndices;
            LPTSTR resBuf = NULL;
            try {
                resBuf = (LPTSTR)new char[nResolutions * sizeof(LONG) * 2];
            } catch (std::bad_alloc&) {
                resBuf = NULL;
            }
            if (resBuf != NULL) {
                if (::DeviceCapabilities(printerName, printerPort,
                                         DC_ENUMRESOLUTIONS, resBuf,
                                         NULL) != -1) {
                    LONG *pResolution = (LONG *)resBuf;
                    for (int i = 0; i < nResolutions; i++) {
                        jpcIndices[i*2] = *pResolution++;
                        jpcIndices[i*2+1] = *pResolution++;
                    }
                }
                RESTORE_CONTROLWORD
                delete[] resBuf;
            }
            env->ReleaseIntArrayElements(resolutionArray, saveFormats, 0);
        }
    }
  }

  JNU_ReleaseStringPlatformChars(env, printer, printerName);
  JNU_ReleaseStringPlatformChars(env, printer, printerPort);
  return resolutionArray;
}

jintArray getIDs(JNIEnv *env, jstring printer, jstring port, int dm_id)
{

  LPTSTR printerName = (LPTSTR)JNU_GetStringPlatformChars(env, printer, NULL);
  LPTSTR printerPort = (LPTSTR)JNU_GetStringPlatformChars(env, port, NULL);

  if (printerName == NULL || printerPort == NULL) {
      if (printerName != NULL) {
          JNU_ReleaseStringPlatformChars(env, printer, printerName);
      }
      if (printerPort != NULL) {
          JNU_ReleaseStringPlatformChars(env, port, printerPort);
      }
      return NULL;
  }

  SAVE_CONTROLWORD
  int numIDs = ::DeviceCapabilities(printerName, printerPort, dm_id,
                                    NULL, NULL);
  RESTORE_CONTROLWORD

  jintArray idArray = NULL;
  if (numIDs > 0) {
      idArray = env->NewIntArray(numIDs);
      if (idArray != NULL) {
          jint *jpcIndices = env->GetIntArrayElements(idArray, NULL);
          if (jpcIndices != NULL) {
              jint *saveFormats = jpcIndices;
              LPTSTR buf = NULL;
              try {
                  buf = (LPTSTR)new char[numIDs * sizeof(WORD)];
              } catch (std::bad_alloc&) {
                  buf = NULL;
              }
              if (buf != NULL) {
                  if (::DeviceCapabilities(printerName, printerPort,
                                           dm_id, buf, NULL) != -1) {
                      WORD *id = (WORD *)buf;
                      for (int i = 0; i < numIDs; i++, id++) {
                          jpcIndices[i] = *id;
                      }
                  }
                  RESTORE_CONTROLWORD
                  delete[] buf;
              }
              env->ReleaseIntArrayElements(idArray, saveFormats, 0);
          }
      }
  }

  JNU_ReleaseStringPlatformChars(env, printer, printerName);
  JNU_ReleaseStringPlatformChars(env, port, printerPort);
  return idArray;
}

JNIEXPORT jintArray JNICALL
Java_sun_print_Win32PrintService_getAllMediaSizes(JNIEnv *env,
                                                  jobject peer,
                                                  jstring printer,
                                                  jstring port)
{
  TRY;

  LPTSTR printerName = (LPTSTR)JNU_GetStringPlatformChars(env,
                                                          printer, NULL);
  LPTSTR printerPort = (LPTSTR)JNU_GetStringPlatformChars(env, port, NULL);

  jintArray mediaArray = NULL;

  SAVE_CONTROLWORD
  int nPapers = ::DeviceCapabilities(printerName, printerPort,
                                      DC_PAPERSIZE,   NULL, NULL) ;
  RESTORE_CONTROLWORD
  if (nPapers > 0) {
    mediaArray = env->NewIntArray(nPapers*2);
    if (mediaArray == NULL) {
      throw std::bad_alloc();
    }

    jboolean isCopy;
    jint *jpcIndices = env->GetIntArrayElements(mediaArray,
                                          &isCopy), *saveFormats = jpcIndices;

    LPTSTR buf = (LPTSTR)new char[nPapers * sizeof(POINT)]; // array of POINTs

    if (::DeviceCapabilities(printerName, printerPort,
                             DC_PAPERSIZE, buf, NULL) != -1) {

      POINT *pDim = (POINT *)buf;
      for (int i = 0; i < nPapers; i++) {
        jpcIndices[i*2] = (pDim+i)->x;
        jpcIndices[i*2+1] = (pDim+i)->y;
      }
    }
    RESTORE_CONTROLWORD
    delete[] buf;
    env->ReleaseIntArrayElements(mediaArray, saveFormats, 0);
  }

  JNU_ReleaseStringPlatformChars(env, printer, printerName);
  JNU_ReleaseStringPlatformChars(env, port, printerPort);
  return mediaArray;

  CATCH_BAD_ALLOC_RET(NULL);
}

JNIEXPORT jintArray JNICALL
Java_sun_print_Win32PrintService_getAllMediaTrays(JNIEnv *env,
                                                  jobject peer,
                                                  jstring printer,
                                                  jstring port)
{
  TRY;

  LPTSTR printerName = (LPTSTR)JNU_GetStringPlatformChars(env,
                                                          printer, NULL);
  LPTSTR printerPort = (LPTSTR)JNU_GetStringPlatformChars(env, port, NULL);

  jintArray mediaTrayArray = NULL;

  SAVE_CONTROLWORD
  int nBins = ::DeviceCapabilities(printerName, printerPort,
                                   DC_BINS,   NULL, NULL) ;
  RESTORE_CONTROLWORD
  if (nBins > 0) {
    mediaTrayArray = env->NewIntArray(nBins);
    if (mediaTrayArray == NULL) {
      throw std::bad_alloc();
    }

    jboolean isCopy;
    jint *jpcIndices = env->GetIntArrayElements(mediaTrayArray,
                                           &isCopy), *saveFormats = jpcIndices;

    LPTSTR buf = (LPTSTR)new char[nBins * sizeof(WORD)];

    if (::DeviceCapabilities(printerName, printerPort,
                             DC_BINS, buf, NULL) != -1) {
      RESTORE_CONTROLWORD
      WORD *pBins = (WORD *)buf;
      for (int i = 0; i < nBins; i++) {
        jpcIndices[i] = *(pBins+i);
      }
    }
    delete[] buf;
    env->ReleaseIntArrayElements(mediaTrayArray, saveFormats, 0);
  }

  JNU_ReleaseStringPlatformChars(env, printer, printerName);
  JNU_ReleaseStringPlatformChars(env, port, printerPort);
  return mediaTrayArray;

  CATCH_BAD_ALLOC_RET(NULL);
}

/*
 * Class:     sun_tools_attach_VirtualMachineImpl
 * Method:    open
 * Signature: (Ljava/lang/String;)I
 */
JNIEXPORT jint JNICALL Java_sun_tools_attach_VirtualMachineImpl_open
  (JNIEnv *env, jclass cls, jstring path)
{
    jboolean isCopy;
    const char* p = GetStringPlatformChars(env, path, &isCopy);
    if (p == NULL) {
        return 0;
    } else {
        int fd;
        int err = 0;

        fd = open(p, O_RDWR);
        if (fd == -1) {
            err = errno;
        }

        if (isCopy) {
            JNU_ReleaseStringPlatformChars(env, path, p);
        }

        if (fd == -1) {
            if (err == ENOENT) {
                JNU_ThrowByName(env, "java/io/FileNotFoundException", NULL);
            } else {
                char* msg = strdup(strerror(err));
                JNU_ThrowIOException(env, msg);
                if (msg != NULL) {
                    free(msg);
                }
            }
        }
        return fd;
    }
}

void AwtList::_AddItems(void *param)
{
    JNIEnv *env = (JNIEnv *)JNU_GetEnv(jvm, JNI_VERSION_1_2);

    AddItemsStruct *ais = (AddItemsStruct *)param;
    jobject self = ais->list;
    jobjectArray items = ais->items;
    jint index = ais->index;
    jint width = ais->width;

    int badAlloc = 0;
    AwtList *l = NULL;

    PDATA pData;
    JNI_CHECK_PEER_GOTO(self, ret);
    JNI_CHECK_NULL_GOTO(items, "null items", ret);
    l = (AwtList*)pData;
    if (::IsWindow(l->GetHWnd()))
    {
        int itemCount = env->GetArrayLength(items);
        if (itemCount > 0)
        {
            AwtList* l = (AwtList*)pData;
            l->SendListMessage(WM_SETREDRAW, (WPARAM)FALSE, 0);
            for (jsize i=0; i < itemCount; i++)
            {
                LPTSTR itemPtr = NULL;
                jstring item = (jstring)env->GetObjectArrayElement(items, i);
                if (env->ExceptionCheck()) goto ret;
                if (item == NULL) goto next_item;
                itemPtr = (LPTSTR)JNU_GetStringPlatformChars(env, item, 0);
                if (itemPtr == NULL)
                {
                    badAlloc = 1;
                }
                else
                {
                    l->InsertString(index+i, itemPtr);
                    JNU_ReleaseStringPlatformChars(env, item, itemPtr);
                }
                env->DeleteLocalRef(item);
next_item:
                ;
            }
            l->SendListMessage(WM_SETREDRAW, (WPARAM)TRUE, 0);
            l->InvalidateList(NULL, TRUE);
            l->CheckMaxWidth(width);
        }
    }
ret:
    env->DeleteGlobalRef(self);
    env->DeleteGlobalRef(items);

    delete ais;

    if (badAlloc)
    {
        throw std::bad_alloc();
    }
}

void AwtPopupMenu::Enable(BOOL isEnabled)
{
    AwtMenu *menu = GetMenuContainer();
    if (menu != NULL) {
        AwtMenu::Enable(isEnabled);
        return;
    }
    JNIEnv *env = (JNIEnv *)JNU_GetEnv(jvm, JNI_VERSION_1_2);
    if (env->EnsureLocalCapacity(1) < 0) {
        return;
    }
    jobject target = GetTarget(env);
    int nCount = CountItem(target);
    for (int i = 0; i < nCount; ++i) {
        AwtMenuItem *item = GetItem(target,i);
        jobject jitem = item->GetTarget(env);
        BOOL bItemEnabled = isEnabled && (jboolean)env->GetBooleanField(jitem,
            AwtMenuItem::enabledID);
        jstring labelStr = static_cast<jstring>(env->GetObjectField(jitem, AwtMenuItem::labelID));
        LPCWSTR labelStrW = JNU_GetStringPlatformChars(env, labelStr, NULL);
        if (labelStrW  && wcscmp(labelStrW, L"-") != 0) {
            item->Enable(bItemEnabled);
        }
        JNU_ReleaseStringPlatformChars(env, labelStr, labelStrW);
        env->DeleteLocalRef(labelStr);
        env->DeleteLocalRef(jitem);
    }
    env->DeleteLocalRef(target);
}

JNIEXPORT jlong JNICALL
Java_sun_print_Win32PrintServiceLookup_notifyFirstPrinterChange(JNIEnv *env,
                                                                jobject peer,
                                                                jstring printer) {
    HANDLE hPrinter;

    LPTSTR printerName = NULL;
    if (printer != NULL) {
        printerName = (LPTSTR)JNU_GetStringPlatformChars(env,
                                                         printer,
                                                         NULL);
        JNU_ReleaseStringPlatformChars(env, printer, printerName);
    }

    // printerName - "Win NT/2K/XP: If NULL, it indicates the local printer
    // server" - MSDN.   Win9x : OpenPrinter returns 0.
    BOOL ret = OpenPrinter(printerName, &hPrinter, NULL);
    if (!ret) {
      return (jlong)-1;
    }

    // PRINTER_CHANGE_PRINTER = PRINTER_CHANGE_ADD_PRINTER |
    //                          PRINTER_CHANGE_SET_PRINTER |
    //                          PRINTER_CHANGE_DELETE_PRINTER |
    //                          PRINTER_CHANGE_FAILED_CONNECTION_PRINTER
    HANDLE chgObj = FindFirstPrinterChangeNotification(hPrinter,
                                                       PRINTER_CHANGE_PRINTER,
                                                       0,
                                                       NULL);
    return (chgObj == INVALID_HANDLE_VALUE) ? (jlong)-1 : (jlong)chgObj;
}

JNIEXPORT jint JNICALL
Java_sun_nio_ch_InheritedChannel_open0(JNIEnv *env, jclass cla, jstring path, jint oflag)
{
    const char* str;
    int oflag_actual;

    /* convert to OS specific value */
    switch (oflag) {
        case sun_nio_ch_InheritedChannel_O_RDWR :
            oflag_actual = O_RDWR;
            break;
        case sun_nio_ch_InheritedChannel_O_RDONLY :
            oflag_actual = O_RDONLY;
            break;
        case sun_nio_ch_InheritedChannel_O_WRONLY :
            oflag_actual = O_WRONLY;
            break;
        default :
            JNU_ThrowInternalError(env, "Unrecognized file mode");
            return -1;
    }

    str = JNU_GetStringPlatformChars(env, path, NULL);
    if (str == NULL) {
        return (jint)-1;
    } else {
        int fd = open(str, oflag_actual);
        if (fd < 0) {
            JNU_ThrowIOExceptionWithLastError(env, str);
        }
        JNU_ReleaseStringPlatformChars(env, path, str);
        return (jint)fd;
    }
}

/*
 * Class:     sun_tools_attach_VirtualMachineImpl
 * Method:    checkPermissions
 * Signature: (Ljava/lang/String;)V
 */
JNIEXPORT void JNICALL Java_sun_tools_attach_VirtualMachineImpl_checkPermissions
  (JNIEnv *env, jclass cls, jstring path)
{
    jboolean isCopy;
    const char* p = GetStringPlatformChars(env, path, &isCopy);
    if (p != NULL) {
        struct stat64 sb;
        uid_t uid, gid;
        int res;

        /*
         * Check that the path is owned by the effective uid/gid of this
         * process. Also check that group/other access is not allowed.
         */
        uid = geteuid();
        gid = getegid();

        res = stat64(p, &sb);
        if (res != 0) {
            /* save errno */
            res = errno;
        }

        if (res == 0) {
            char msg[100];
            jboolean isError = JNI_FALSE;
            if (sb.st_uid != uid) {
                jio_snprintf(msg, sizeof(msg)-1,
                    "file should be owned by the current user (which is %d) but is owned by %d", uid, sb.st_uid);
                isError = JNI_TRUE;
            } else if (sb.st_gid != gid) {
                jio_snprintf(msg, sizeof(msg)-1,
                    "file's group should be the current group (which is %d) but the group is %d", gid, sb.st_gid);
                isError = JNI_TRUE;
            } else if ((sb.st_mode & (S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH)) != 0) {
                jio_snprintf(msg, sizeof(msg)-1,
                    "file should only be readable and writable by the owner but has 0%03o access", sb.st_mode & 0777);
                isError = JNI_TRUE;
            }
            if (isError) {
                char buf[256];
                jio_snprintf(buf, sizeof(buf)-1, "well-known file %s is not secure: %s", p, msg);
                JNU_ThrowIOException(env, buf);
            }
        } else {
            char* msg = strdup(strerror(res));
            JNU_ThrowIOException(env, msg);
            if (msg != NULL) {
                free(msg);
            }
        }

        if (isCopy) {
            JNU_ReleaseStringPlatformChars(env, path, p);
        }
    }
}

void AwtCheckbox::_SetLabel(void *param)
{
    JNIEnv *env = (JNIEnv *)JNU_GetEnv(jvm, JNI_VERSION_1_2);

    SetLabelStruct *sls = (SetLabelStruct *)param;
    jobject checkbox = sls->checkbox;
    jstring label = sls->label;

    int badAlloc = 0;
    AwtCheckbox *c = NULL;

    PDATA pData;
    JNI_CHECK_PEER_GOTO(checkbox, done);

    c = (AwtCheckbox *)pData;
    if (::IsWindow(c->GetHWnd()))
    {
        LPCTSTR labelStr = NULL;

        // By convension null label means empty string
        if (label == NULL)
        {
            labelStr = TEXT("");
        }
        else
        {
            labelStr = JNU_GetStringPlatformChars(env, label, JNI_FALSE);
        }

        if (labelStr == NULL)
        {
            badAlloc = 1;
        }
        else
        {
            c->SetText(labelStr);
            c->VerifyState();
            if (label != NULL) {
                JNU_ReleaseStringPlatformChars(env, label, labelStr);
            }
        }
    }

done:
    env->DeleteGlobalRef(checkbox);
    if (label != NULL)
    {
        env->DeleteGlobalRef(label);
    }

    delete sls;

    if (badAlloc) {
        throw std::bad_alloc();
    }
}

/* Implementation of DebugHelperImpl.printlnImpl */
JNIEXPORT void JNICALL
Java_sun_awt_DebugHelperImpl_printlnImpl(JNIEnv *env, jclass cls, jstring msg) {
    const char *	cstr;
    cstr = JNU_GetStringPlatformChars(env, msg, NULL);
    if ( cstr == NULL ) {
	return;
    }
    DTrace_JavaPrintln(cstr);
    JNU_ReleaseStringPlatformChars(env, msg, cstr);
}

JNIEXPORT jint JNICALL
Java_java_util_prefs_FileSystemPreferences_chmod(JNIEnv *env,
        jclass thisclass, jstring java_fname, jint permission) {
    const char *fname = JNU_GetStringPlatformChars(env, java_fname, JNI_FALSE);
    int result;
    result =  chmod(fname, permission);
    if (result != 0)
        result = errno;
    JNU_ReleaseStringPlatformChars(env, java_fname, fname);
    return (jint) result;
}