PyQt4 的 xml 数据库浏览器问题（treeview、singals 和 insertplaintext）
我正在使用 PyQt4 编写一个数据库浏览器应用程序，因为我是 Qt 新手，所以遇到了一些问题。我已经用 python 编写了大部分功能，但知道我正在尝试使用 PyQt4 GUI 来实现它们。
首先，我的应用程序现在看起来像这样：
浏览器
在这些目录中，我有我想要解析的 xml 文件。 我写过这样的东西：
<代码> QtCore.QObject.connect(self.ui.treeView, QtCore.SIGNAL("clicked(QModelIndex)"), self.ui.plainTextEdit, QtCore.SLOT("paste()"))
它有效。但是当我尝试做这样的事情时：QtCore.QObject.connect(self.ui.treeView, QtCore.SIGNAL("clicked(QModelIndex)"), self.ui.plainTextEdit, QtCore.SLOT("insertPlainText('test')"))
它失败了。阅读手册后我知道 SIGNAL 和 SLOT 必须采用相同的参数。所以我应该编写一些执行 SLOT 的信号，该 SLOT 是一个带有 QModelIndex 参数的函数，它查找单击的文件，创建 xmldocument 对象，然后打印出它的字典。
我的问题是：
- How can I create such function which is callable as SLOT?
因为在 ui 文件中我创建了一个函数：定义测试（自我）： 打印“调试”
当我试图调用它时QtCore.QObject.connect(self.ui.treeView, QtCore.SIGNAL("clicked(QModelIndex)"), self.ui.test() ）
我收到此错误：类型错误：参数与任何重载调用都不匹配：
QObject.connect(QObject, SIGNAL(), QObject, SLOT(), Qt.ConnectionType=Qt.AutoConnection)：参数 3 具有意外类型“NoneType”
QObject.connect(QObject, SIGNAL(), callable, Qt.ConnectionType=Qt.AutoConnection): 参数 3 具有意外类型“NoneType”
QObject.connect(QObject, SIGNAL(), SLOT(), Qt.ConnectionType=Qt.AutoConnection)：参数 2 具有意外类型“str”
还有一个问题：
- How should I get path to clicked file from QModelIndex?
I'm writing a database browser application with PyQt4 and because I'm new to Qt, I have some problems. I have most functionalities already written in python but know I'm trying to implement them with PyQt4 GUI.
First of all my application now looks like this:
Browser
In these catalogues I have xml files which I would like to parse.
I've written something like this:
QtCore.QObject.connect(self.ui.treeView, QtCore.SIGNAL("clicked(QModelIndex)"), self.ui.plainTextEdit, QtCore.SLOT("paste()"))
and it works. But when I'm trying to do something like this:
QtCore.QObject.connect(self.ui.treeView, QtCore.SIGNAL("clicked(QModelIndex)"), self.ui.plainTextEdit, QtCore.SLOT("insertPlainText('test')"))
it fails. After reading the manual I know that SIGNAL and SLOT must take the same arguments. So I should write some signal which executes a SLOT which is a function with QModelIndex argument which finds clicked file, creates the xmldocument object and then prints out it's dictionaries.
My questions are:
- How can I create such function which is callable as SLOT?
Because inside ui file I created a function:
def test(self):
print "Debug"
And when I'm trying to call it out
QtCore.QObject.connect(self.ui.treeView, QtCore.SIGNAL("clicked(QModelIndex)"), self.ui.test())
I'm getting this error:
TypeError: arguments did not match any overloaded call:
QObject.connect(QObject, SIGNAL(), QObject, SLOT(), Qt.ConnectionType=Qt.AutoConnection): argument 3 has unexpected type 'NoneType'
QObject.connect(QObject, SIGNAL(), callable, Qt.ConnectionType=Qt.AutoConnection): argument 3 has unexpected type 'NoneType'
QObject.connect(QObject, SIGNAL(), SLOT(), Qt.ConnectionType=Qt.AutoConnection): argument 2 has unexpected type 'str'
And another question:
- How should I get path to clicked file from QModelIndex?
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考虑使用 PyQt 提供的新型连接机制：
现在，
paste是一个接受单个参数的方法，并且该参数的类型为clicked信号>self.ui.treeView 发送。如您所愿，从那里进行解剖。如何创建可作为 SLOT 调用的函数？
这是一个不同的错误。您连接到
self.ui.test()，但这是函数调用，而不是函数。删除test后面的()。但更好的是，使用如上所述的新型连接机制。我应该如何从 QModelIndex 获取单击文件的路径？
可能是通过调用其
data方法。阅读QModelIndex的文档Consider using the new-style connection mechanism provided by PyQt:
Now,
pasteis a method accepting a single argument, and this argument is of the type theclickedsignal ofself.ui.treeViewsends. Dissect if from there, as you wish.How can I create such function which is callable as SLOT?
It's a different error. You connect to
self.ui.test(), but this is a function call, not a function. Remove the()aftertest. But better yet, use the new-style connection mechanism as described above.How should I get path to clicked file from QModelIndex?
Probably by calling its
datamethod. Read the doc forQModelIndex