我正在编写一个Firefox扩展程序,它将获取当前浏览器的句柄并将其写入sqlite数据库。我的整个代码是:
Components.utils.import("resource://gre/modules/Services.jsm");
Components.utils.import("resource://gre/modules/FileUtils.jsm");
let file = FileUtils.getFile("ProfD", ["testing.sqlite"]);
let dbConn = Services.storage.openDatabase(file);
var browserWindow = Services.wm.getMostRecentWindow('navigator:browser');
if (!browserWindow) {
throw new Error('No browser window found');
}
var baseWindow = browserWindow.QueryInterface(Ci.nsIInterfaceRequestor)
.getInterface(Ci.nsIWebNavigation)
.QueryInterface(Ci.nsIDocShellTreeItem)
.treeOwner
.QueryInterface(Ci.nsIInterfaceRequestor)
.getInterface(Ci.nsIBaseWindow);
var hwndString = baseWindow.nativeHandle;
Components.utils.import('resource://gre/modules/ctypes.jsm');
var user32 = ctypes.open('user32.dll');
/* http://msdn.microsoft.com/en-us/library/ms633539%28v=vs.85%29.aspx
* BOOL WINAPI SetForegroundWindow(
* __in_ HWND hWnd
* );
*/
var SetForegroundWindow = user32.declare('SetForegroundWindow', ctypes.winapi_abi,
ctypes.bool, // return BOOL
ctypes.voidptr_t // HWND
);
var hwnd
hwnd = ctypes.voidptr_t(ctypes.UInt64(hwndString));
var rez_SetForegroundWindow = SetForegroundWindow(hwnd);
console.log('hwnd: ', hwnd.toString());
dbConn.createStatement("INSERT INTO tblHandles(handle) VALUES("+ hwnd +")");
//dbConn.executeSimpleSQL("INSERT INTO tblHandles(handle) VALUES("+ hwnd+")");
user32.close();
我收到错误:
NS_ERROR_FAILURE: Component returned failure code: 0x80004005 (NS_ERROR_FAILURE) [mozIStorageConnection.createStatement]
在这一行:
dbConn.createStatement("INSERT INTO tblHandles(handle) VALUES("+ hwnd +")");
createStatement和executeSimpleSQL都抛出同样的错误,我不知道为什么。
答案 0 :(得分:1)
我认为该语句需要一个字符串,你将它传递给一个对象,特别是你传递它CData { }
这就是行hwnd = ctypes.voidptr_t(ctypes.UInt64(hwndString));
所做的。因此,而不是dbConn.createStatement("INSERT INTO tblHandles(handle) VALUES("+ hwnd +")");
执行此操作:
dbConn.createStatement("INSERT INTO tblHandles(handle) VALUES("+ hwndString +")");
同样jsctypes很酷,但我认为最好只在绝对必要的情况下使用,因为我认为性能稍差。所以不需要使用它来聚焦窗口。而只是做browserWindow..focus();
注意: 另外我看到你将Components.utils和Ci混合在一起定义Ci是什么?如果你不是为什么不在那里定义Cu并且做Cu而不是Components.utils。