如果我应该有一个数组，并且我想procedure TForm_Config.FormCreate(Sender: TObject);
type
tagWAVEOUTCAPS2A = packed record
wMid: WORD;
wPid: WORD;
vDriverVersion: MMVERSION;
szPname: array[0..MAXPNAMELEN-1] of AnsiChar;
dwFormats: DWORD;
wChannels: WORD;
wReserved1: WORD;
dwSupport: DWORD;
ManufacturerGuid: System.TGUID;
ProductGuid: System.TGUID;
NameGuid: System.TGUID;
end;
var
i,outdevs: Integer;
woCaps: tagWAVEOUTCAPS2A;
RegistryService: TRegistry;
iClasses, iSubClasses, iNames: Integer;
audioDeviceClasses, audioDeviceSubClasses, audioDeviceNames: TStringList;
initialDeviceName, partialDeviceName, fullDeviceName: string;
begin
audioDeviceClasses := TStringList.Create;
audioDeviceSubClasses := TStringList.Create;
audioDeviceNames := TStringList.Create;
try
RegistryService := TRegistry.Create;
try
RegistryService.RootKey := HKEY_LOCAL_MACHINE;
if RegistryService.OpenKeyReadOnly('\SYSTEM\CurrentControlSet\Enum\HDAUDIO\') then begin
RegistryService.GetKeyNames(audioDeviceClasses);
RegistryService.CloseKey();
for iClasses := 0 to audioDeviceClasses.Count - 1 do begin
if RegistryService.OpenKeyReadOnly('\SYSTEM\CurrentControlSet\Enum\HDAUDIO\'+audioDeviceClasses[iClasses]) then begin
RegistryService.GetKeyNames(audioDeviceSubClasses);
RegistryService.CloseKey();
for iSubClasses := 0 to audioDeviceSubClasses.Count - 1 do begin
if RegistryService.OpenKeyReadOnly('\SYSTEM\CurrentControlSet\Enum\HDAUDIO\'+audioDeviceClasses[iClasses]+'\'+audioDeviceSubClasses[iSubClasses]) then begin
if RegistryService.ValueExists('DeviceDesc') then begin
fullDeviceName := Trim(RegistryService.ReadString('DeviceDesc'));
if AnsiPos(';',fullDeviceName) > 0 then begin
fullDeviceName := Trim(AnsiMidStr(fullDeviceName, AnsiPos(';',fullDeviceName)+1, Length(fullDeviceName)));
end;
audioDeviceNames.Add(fullDeviceName);
end;
RegistryService.CloseKey();
end;
end;
end;
end;
end;
finally
FreeAndNil(RegistryService);
end;
// WaveOutDevComboBox is a selection box (combo) placed in the form and will receive the list of output audio devices
WaveOutDevComboBox.Clear;
try
outdevs := waveOutGetNumDevs;
for i := 0 to outdevs - 1 do begin
ZeroMemory(@woCaps, sizeof(woCaps));
if waveOutGetDevCaps(i, @woCaps, sizeof(woCaps)) = MMSYSERR_NOERROR then begin
RegistryService := TRegistry.Create;
try
RegistryService.RootKey := HKEY_LOCAL_MACHINE;
if RegistryService.OpenKeyReadOnly('\System\CurrentControlSet\Control\MediaCategories\' + GUIDToString(woCaps.NameGuid)) then begin
WaveOutDevComboBox.Items.Add(RegistryService.ReadString('Name'));
RegistryService.CloseKey();
end
else begin
initialDeviceName := '';
partialDeviceName := Trim(woCaps.szPname);
if AnsiPos('(',partialDeviceName) > 0 then begin
initialDeviceName := Trim(AnsiLeftStr(partialDeviceName,AnsiPos('(',partialDeviceName)-1));
partialDeviceName := Trim(AnsiMidStr(partialDeviceName,AnsiPos('(',partialDeviceName)+1,Length(partialDeviceName)));
if AnsiPos(')',partialDeviceName) > 0 then begin
partialDeviceName := Trim(AnsiLeftStr(partialDeviceName,AnsiPos(')',partialDeviceName)-1));
end;
end;
for iNames := 0 to audioDeviceNames.Count - 1 do begin
fullDeviceName := audioDeviceNames[iNames];
if AnsiStartsText(partialDeviceName,fullDeviceName) then begin
break;
end
else begin
fullDeviceName := partialDeviceName;
end;
end;
WaveOutDevComboBox.Items.Add(initialDeviceName + IfThen(initialDeviceName<>EmptyStr,' (','') + fullDeviceName + IfThen(initialDeviceName<>EmptyStr,')',''));
end;
finally
FreeAndNil(RegistryService);
end;
end;
end;
except
WaveOutDevComboBox.Enabled := False;
end;
finally
FreeAndNil(audioDeviceClasses);
FreeAndNil(audioDeviceSubClasses);
FreeAndNil(audioDeviceNames);
end;
end;
将数组中的所有元素放入节点的路径中，以便在给定关系名称时，将创建节点（如果它们尚不存在），并且然后彼此连接，数组中的最后一个元素将是叶子节点。我该如何在CYPHER中编写代码？
答案 0 :(得分：1)
我不确定我是否理解正确，但是如果要将元素数组转换为节点的顺序路径，请使用以下查询：
WITH [1,2,3,4,5] as start
UNWIND start as a
MERGE (l:Label{id:a})
WITH collect(l) as array
FOREACH(i in RANGE(0, length(array)-2) |
FOREACH(element1 in [array[i]] |
FOREACH(element2 in [array[i+1]] |
MERGE (element1)-[:NEXT]->(element2))))
答案 1 :(得分：1)
Tomaž的答案是正确的，而且仅靠Cypher就能做到。
作为对此的补充，如果您安装了APOC Procedures，则可以使用以下过程为您执行此链接。
使用Tomaž的查询做了一些修改：
WITH [1,2,3,4,5] as start
UNWIND start as a
MERGE (l:Label{id:a})
WITH collect(l) as array
CALL apoc.nodes.link(array, 'NEXT')
RETURN true // since we can't end the query on a procedure call