On Tue, 17 Sep 2013 08:42:35 +0430, Mohsen Pahlevanzadeh wrote:
Dear all,
Unfortunately, i confused and need help... the following code is:
###################################################
##CheckBox:
QtCore.QObject.connect(self.checkBox,
QtCore.SIGNAL(_fromUtf8("toggled(bool)")), lambda:
self.materialsInstance.setFilterDict("C", self, "name",
self.lineEdit.text()))
I don't use Qt, but I'll try to help.
First question, what does _fromUtf8 do? It appears to be a private
function. Is that your function? If you want to create a string from UTF-8
bytes, use:
some_bytes.decode('utf-8')
I don't think there is a need for a dedicated _fromUtf8 function.
If you are using Python 3, then "toggled(bool)" is already a Unicode
string, and there is no need to convert from UTF-8.
If you are using Python 2, then "toggled(bool)" is a byte string, and you
can turn it into a Unicode string by just using the u prefix:
u"toggled(bool)"
Again, no need to convert from UTF-8.
The only time you need to convert from UTF-8 is when you are reading data
from a file, or other external source, that is encoded in UTF-8.
Other than that, your first line of code seems like a straight-forward
call to set a callback function. When the button is pressed, the
instance's attribute materialsInstance calls the method setFilterDict.
QtCore.QObject.connect(self.checkBox_2,
QtCore.SIGNAL(_fromUtf8("toggled(bool)")), lambda:
self.materialsInstance.setFilterDict("C", self, "bought_price",
persianToInteger(unicode(self.lineEdit_2.text()))))
Again, the same method is called, only this time with different
arguments. Hmmm, this strikes me as poor design. I think that a better
design would be for the object to have a few methods:
def toggle_checkbox(self, flag):
# checkbox logic goes here, e.g.
if flag:
...
else:
...
And then your callback is trivially
lambda: self.toggle_checkbox(get_state)
I'm not sure how to get the checkbox state from Qt, you will need to
replace the "get_state" with the correct code.
That, in my opinion, is easier to understand.
QtCore.QObject.connect(self.checkBox_4,
QtCore.SIGNAL(_fromUtf8("toggled(bool)")), lambda:
self.materialsInstance.setFilterDict("C",self,"stock",
persianToInteger(unicode(self.lineEdit_3.text()))))
And more callbacks. Most of your code is probably irrelevant to the
problem you are having. You will help us to help you if you can read this
website:
http://sscce.org/
and simplify your code.
[...many more callbacks...]
####################################################
Description:
I have 3 widget:
1. CheckBox: a. name b. bought_price c. stock 2. LineEdit : a. name b.
bought_price c. stock 3. One PushButton
i have three slot: 1. responseToRequestForData() 2.setFilterDict()
3.unSetFilterDict()
responseToRequestForData(): start to search in DB setFilterDict(): fill
a dict from my LineEdit
Problem:
My name is filled in dict but its value doesn't fill up. b and c don't
have any problem.
I'm afraid I don't understand this. Even your followup post doesn't
really help:
I see same output in console:
{'stock': 2, 'name': PyQt4.QtCore.QString(u''), 'bought_price': 23}
What result where you expecting?
If I remember correctly, Qt strings are mutable unicode strings, so
'name' is associated with an empty Qt string. If they are mutable, that
means that once the dict is set:
{'name': QString(u'contents of text field'), ...}
if the text field changes, so will the string. Is that what is happening?
(Or perhaps I have mis-remembered about Qt strings.)
You have two callbacks that appear to set the "name" key in the dict.
Perhaps one of them is setting it to an empty value.
