我之前已阅读过本网站和其他平台上的几个主题，但我的代码仍无法正常工作。我似乎无法将所有拼图拼凑在一起，需要有人查看我的代码。
我正在为程序QtiPlot编写插件。我使用Python 2.7.6和PyQt4。我用QT Designer创建了Plugin GUI。我也是Python的新手。我正在使用这些＆＃34; old＆＃34;资源，因为我的前任已经使用过它们。
我目前的任务是开发设置，即能够保存和恢复参数。 为此，我在此网站上找到了一个模板：Python PyQt4 functions to save and restore UI widget values?
我想将参数保存到Ini-File。 但是我对QVariants有问题。而不是我插入插件中的字符串，表达式＆＃34; PyQt4.QtCore.QVariant对象位于0x08667FB0＆＃34;正在得救。我已经知道这是一个问题，因为QVariant没有被正确地转换回Python对象。
因此，为了手动转换QVariants，我添加了短语＆＃34; toString（）＆＃34;恢复功能中QLineEdit-Objects的值赋值（注释掉的行是以前的版本）。但是我的插件中的QLineEdit-Blocks是空的，这让我很困惑。我在文档中读到如果QVariant不包含其中一种预设类型（包括字符串），则返回空字符串。但是这种情况发生了，尽管我之前输入了一个字符串。
这是否意味着首先没有正确保存字符串？或者它是什么意思，我想念什么或我做错了什么？
我还注意到Ini-File中没有存储任何值，因此部分代码仍然存在错误。但我不确定这是否是由于保存功能不起作用或因为Ini结构本身是错误的。
此外，我尝试在配置文件的头部使用SIP模块来解决我的问题（它也被注释掉了，因为到目前为止它对我来说并不起作用）。但是，虽然我把它放在代码的头部，然后我得到错误＆＃34; API＆＃39; QVariant＆＃39;已经设置为版本1＆＃34;。我不明白为什么或从SIP指令被覆盖的内容。有什么方法可以解决这个问题吗？
我的配置程序如下所示：
#import sip
#sip.setapi('QVariant', 2)
#sip.setapi('QString', 2)
import inspect
import sys
from PyQt4.QtCore import *
from PyQt4.QtGui import *
sys.path.append("C:\\Program Files (x86)\\QtiPlot\\app\\02 Python Packages")
import PyQt4_Save_Restore_UI_Widget_Values
class app_conf(QtGui.QWidget):
def __init__(self):
super(self.__class__, self).__init__()
self.version = 1.0
QtCore.QCoreApplication.setOrganizationName("Organization")
QtCore.QCoreApplication.setApplicationName("Application")
QtCore.QSettings.setPath(QSettings.IniFormat, QSettings.UserScope, "C:\\Program Files (x86)\\QtiPlot\\app\\02 Python Packages\\saved.ini")
self.settings = QtCore.QSettings("C:\\Program Files (x86)\\QtiPlot\\app\\02 Python Packages\\saved.ini", QSettings.IniFormat)
from PyQt4 import uic
self.ui = uic.loadUi(r"C:\Program Files (x86)/QtiPlot/app/03 UI Files/Config.ui")
PyQt4_Save_Restore_UI_Widget_Values.gui_restore_settings(self.ui, self.settings)
self.ui.closeEvent = self.closeEvent
self.ui.show()
def closeEvent(self, event):
PyQt4_Save_Restore_UI_Widget_Values.gui_save_settings(self.ui, self.settings)
window = app_conf()
我的设置模块（PyQt4_Save_Restore_UI_Widget_Values.py）如下所示：
#===================================================================
# Module with functions to save & restore qt widget values
# Written by: Alan Lilly
# Website: http://panofish.net
#===================================================================
import sys
from PyQt4.QtCore import *
from PyQt4.QtGui import *
import inspect
def gui_save_settings(ui, settings):
#for child in ui.children(): # works like getmembers, but because it traverses the hierarachy, you would have to call guisave recursively to traverse down the tree
for name, obj in inspect.getmembers(ui):
#if type(obj) is QComboBox: # this works similar to isinstance, but missed some field... not sure why?
if isinstance(obj, QComboBox):
name = obj.objectName() # get combobox name
index = obj.currentIndex() # get current index from combobox
text = obj.itemText(index) # get the text for current index
settings.setValue(name, text) # save combobox selection to registry
if isinstance(obj, QLineEdit):
name = obj.objectName()
value = obj.text()
settings.setValue(name, value) # save ui values, so they can be restored next time
if isinstance(obj, QCheckBox):
name = obj.objectName()
state = obj.checkState()
settings.setValue(name, state)
def gui_restore_settings(ui, settings):
for name, obj in inspect.getmembers(ui):
if isinstance(obj, QComboBox):
index = obj.currentIndex() # get current region from combobox
#text = obj.itemText(index) # get the text for new selected index
name = obj.objectName()
value = unicode(settings.value(name))
if value == "":
continue
index = obj.findText(value) # get the corresponding index for specified string in combobox
if index == -1: # add to list if not found
obj.insertItems(0,[value])
index = obj.findText(value)
obj.setCurrentIndex(index)
else:
obj.setCurrentIndex(index) # preselect a combobox value by index
if isinstance(obj, QLineEdit):
name = obj.objectName()
#value = unicode(settings.value(name)) # get stored value from registry
value = settings.value(name).toString()
obj.setText(value) # restore lineEditFile
if isinstance(obj, QCheckBox):
name = obj.objectName()
value = settings.value(name) # get stored value from registry
if value != None:
obj.setCheckState(value.toBool()) # restore checkbox
################################################################
if __name__ == "__main__":
# execute when run directly, but not when called as a module.
# therefore this section allows for testing this module!
#print "running directly, not as a module!"
sys.exit()
答案 0 :(得分：2)
与Python 2和SIP旧API一样，toString()将返回QString。对于str和get方法，您必须使用set将其强制为Python字符串。关于QCheckBox，我使用了toInt方法而不是toBool方法（对我来说效果很好）。
以下是保存和恢复功能的修改版本：
def gui_save_settings(ui, settings):
for _, obj in inspect.getmembers(ui):
name = obj.objectName()
# Set QComboBox setting
if isinstance(obj, QComboBox):
value = str(obj.currentText()) # get current text from combobox
settings.setValue(name, value) # save combobox selection to registry
# Set QLineEdit setting
if isinstance(obj, QLineEdit):
value = str(obj.text())
settings.setValue(name, value) # save ui values, so they can be restored next time
# Set QCheckBox setting
if isinstance(obj, QCheckBox):
value = int(checkbox.isChecked())
settings.setValue(name, value)
def gui_restore_settings(ui, settings):
for _, obj in inspect.getmembers(ui):
name = obj.objectName()
# Get QComboBox setting
if isinstance(obj, QComboBox):
value = str(settings.value(name).toString())
if value == "":
continue
index = obj.findText(value) # get the corresponding index for specified string in combobox
if index == -1: # add to list if not found
obj.addItem(value)
index = obj.findText(value)
obj.setCurrentIndex(index) # preselect a combobox value by index
continue
# Get QLineEdit setting
if isinstance(obj, QLineEdit):
value = str(settings.value(name).toString())
obj.setText(value) # restore lineEditFile
continue
# Get QCheckBox setting
if isinstance(obj, QCheckBox):
value, res = settings.value(key).toInt() # get stored value from registry
if res:
obj.setCheckState(value) # restore checkbox
continue
答案 1 :(得分：1)
最佳解决方案是使用sip.setapi。但为了使其正常工作，在应用程序中首次导入PyQt之前，必须必须。所以它需要进入主脚本，而不是配置模块：
#===================================================================
# Module with functions to save & restore qt widget values
# Written by: Alan Lilly
# Website: http://panofish.net
#===================================================================
import sys
import sip
sip.setapi('QVariant', 2)
sip.setapi('QString', 2)
from PyQt4.QtCore import *
from PyQt4.QtGui import *
import inspect
这将确保QVariant和QString始终自动转换为普通的python类型 - 因此无需使用unicode()，toString()，toBool()等