Question

我正在使用Parse.com作为我的后端。我试图在背景中加载一个工作正常的对象，但这些对象有一个指向图像的指针。问题是，为了查询图像类中的图像，我传递一个ParseObject，以便得到图像所指向的对象：

ParseObject advertToGetImageFrom = ParseObject.createWithoutData("Advert", advertList.get(j).getObjectId());

但是，我的日志显示了此结果

D / app：DT34J9zFKI

D / app：dAqVrnZ1rf

D / app：bNtIfOCqeE

D / app：已加载图片：1

D / app：已加载图片：1

D / app：已加载图片：1

这是合理的，因为加载是异步的。但是，所有返回的图像都一样吗？为什么会这样？这是整个电话：

for (int j = 0; j < titleMap.size(); j++){
    ParseQuery<ParseObject> query2 = ParseQuery.getQuery("Image");
    ParseObject advertToGetImageFrom = ParseObject.createWithoutData("Advert", objectList.get(j).getObjectId());
    Log.d("app", advertToGetImageFrom.getObjectId());
    query2.whereEqualTo("advertId", advertToGetImageFrom);

    query2.findInBackground(new FindCallback<ParseObject>() {
        public void done(final List<ParseObject> imageList, ParseException e) {
            // commentList now has the comments for myPost
            Log.d("app", "Images loaded: " + imageList.size());
                if (imageList != null) {
                    ParseFile pFile = (ParseFile) imageList.get(0).get("image");

                pFile.getDataInBackground(new GetDataCallback() {
                    public void done(byte[] data, ParseException e) {
                    if (e == null) {

                        Bitmap bmp = decodeFile(data);
                        ParseObject advertID = imageList.get(0).getParseObject("advertId");
                                                imageMap.put(advertID.getObjectId(), bmp);

                        if (imageMap.size() == titleMap.size())
                            updateCardView();
                        } else {
                            Log.d("test", "There was a problem downloading the data.");
                        }
                    }
                });
            }
        }
    });
}

Answer 1

不熟悉parse.com，但我可以冒险猜测。

我怀疑你的问题在于：

                           ParseObject advertID = imageList.get(0).getParseObject("advertId");

您正在访问imageList调用done回调的findInBackground。问题是您现在处于done getDataInBackground调用的imageList回调中，尽管final为advertID但不会使其成为不可变的并且可能在原始版本后发生了变化调用

乍一看似乎并不是一件可怕的事情，因为这只会影响pFile.getDataInBackground(new GetDataCallback() { // **** Grab the ParseObject befor it gets changed. ParseObject theParseObject = imageList.get(0); public void done(byte[] data, ParseException e) { if (e == null) { Bitmap bmp = decodeFile(data); // **** Refer to the grabbed ParseObject not the changing outer one. ParseObject advertID = theParseObject.getParseObject("advertId");，但会进一步思考，你可能会发现问题。

我认为解决方案可能来获取可能会更改的数据的本地副本。类似的东西：

' Constants (taken from WinReg.h)
'
Const HKEY_CLASSES_ROOT   = &H80000000
Const HKEY_CURRENT_USER   = &H80000001
Const HKEY_LOCAL_MACHINE  = &H80000002
Const HKEY_USERS          = &H80000003

Const REG_SZ        = 1
Const REG_EXPAND_SZ = 2
Const REG_BINARY    = 3
Const REG_DWORD     = 4
Const REG_MULTI_SZ  = 7

' Chose computer name, registry tree and key path
'

Set objExcel = CreateObject("Excel.Application")
objExcel.Workbooks.Add

ObjExcel.Cells (1,1) = "Application Name"
ObjExcel.Cells (1,4) = "Application Vendor"
ObjExcel.Cells (1,2) = "Application Version"
ObjExcel.Cells (1,3) = "DRM Build"

strComputer = InputBox("Enter the Machine name. To run on the current machine, press ENTER", "Machine Name", "")
If strComputer = "" Then
    strComputer = "."
End If

Msgbox "Script is Running and may take couple of minutes to complete. Click on OK to continue",0, "Information"

hDefKey = HKEY_LOCAL_MACHINE


' Connect to registry provider on target machine with current user

Set oReg = GetObject("winmgmts:\\" & strComputer & "\root\default:StdRegProv")

'{impersonationLevel=impersonate}!
' Enum the subkeys of the key path we've chosen

strKeyPath = "SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall"

row = 2

getRegistryEntries hDefKey, strKeyPath, ObjExcel, oReg, row

strKeyPath = "SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall"

getRegistryEntries hDefKey, strKeyPath, ObjExcel, oReg, row

fileName = Year(now) & month(now) & day(now) & hour(now) & minute(now) & second(now)

ObjExcel.ActiveWorkbook.SaveAs "C:\" & fileName & ".xlsx"
ObjExcel.Quit
Set ObjExcel = Nothing

msgbox "Work Done, file saved in C Drive with the name: " & fileName


Function getRegistryEntries(hDefKey, strKeyPath, byRef objExcel, byRef oReg, byRef row)

    oReg.EnumKey hDefKey, strKeyPath, arrSubKeys

    Set objShell = CreateObject("WScript.Shell")


    For Each strSubkey In arrSubKeys

        ' Show the subkey
        '

        furtherKeys = False
        strDisName = "HKEY_LOCAL_MACHINE\" & strKeyPath & "\" & strSubkey & "\DisplayName"

        On Error Resume Next

        present = False
        disName =  objShell.RegRead(strDisName)
        If disName <> "" Then
            present = True
        End If  

        disVersionPresent = false
        disVer = ""
        If present = true Then
            strDisVer = "HKEY_LOCAL_MACHINE\" & strKeyPath & "\" & strSubkey & "\DisplayVersion"
            strDisVendor = "HKEY_LOCAL_MACHINE\" & strKeyPath & "\" & strSubkey & "\Publisher"
            strDRMBuild = "HKEY_LOCAL_MACHINE\" & strKeyPath & "\" & strSubkey & "\DRMBUILD"

            disVer = objShell.RegRead(strDisVer) 
            If  err.number = 0 Then
                disVersionPresent = True
            End If
            If disVersionPresent Then
                ObjExcel.Cells (row,1) = disName
                ObjExcel.Cells (row,2) = "'" & disVer
                furtherKeys = True
                disVendor = objShell.RegRead(strDisVendor) 
                If  err.number = 0 Then
                    ObjExcel.Cells (row,4) =  disVendor
                End If
                DRMBuild = objShell.RegRead(strDRMBuild) 
                If  err.number = 0 Then
                    ObjExcel.Cells (row,3) =  "'" & DRMBuild
                End If
            End If
        End If
        If furtherKeys Then
            row = row + 1
        End If
    Next


End Function

如果这不能解决您的问题，那么我确信它会是这样的。

迭代不同步

1 个答案: