我想通过delphi7在explorer中显示所选文件的名称和扩展名。
我使用下面的代码显示活动窗口的显示标题,但我需要在活动窗口中选择文件名。
function ActiveCaption: string;
var
Handle: THandle;
Len: LongInt;
Title: string;
begin
Result := '';
Handle := GetForegroundWindow;
if Handle <> 0 then
begin
Len := GetWindowTextLength(Handle) + 1;
SetLength(Title, Len);
GetWindowText(Handle, PChar(Title), Len);
ActiveCaption := TrimRight(Title);
end;
end;
procedure TForm1.Timer1Timer(Sender: TObject);
begin
Label1.Caption := ActiveCaption;
end;
答案 0 :(得分:0)
我知道的唯一方法是使用Active-X IShellWindows和IWebBrowser接口。
首先,您必须导入“Microsoft Internet Controls”Active-X(通过组件菜单)。通过这个你将获得一个名为“SHDocVW_TLB”的单位。将此单元和ActiveX单元放在uses子句中。
您可以使用以下两个函数从提供的窗口句柄中检索所选文件:
如果给定句柄属于资源管理器窗口,则第一个函数会进行粗略测试
function isexplorerwindow(exwnd: hwnd): boolean;
var
p: array[0..max_path] of Char;
begin
GetClassName(exwnd, p, SizeOf(p));
result := ((strcomp(p, 'CabinetWClass') = 0) or (strcomp(p, 'ExploreWClass') = 0));
end;
第二个函数检索第n个选定文件的名称:
function getexplorerselectedfile(exwnd: hwnd; nr: integer): string;
var
pvShell: IShellWindows;
pvWeb2: IWebBrowser2;
ovIE: OleVariant;
psp: IServiceProvider;
psb: IShellBrowser;
isw: IShellView;
ido: IDataObject;
FmtEtc: TFormatEtc;
Medium: TStgMedium;
dwcount: integer;
n: integer;
p: array[0..max_path] of Char;
s: string;
found: boolean;
begin
found := false;
result := '';
s :='';
try
pvShell := CoShellWindows.Create;
for dwcount := 0 to Pred(pvShell.count) do
begin
ovIE := pvShell.Item(dwcount);
if (ovIE.hwnd = exwnd) or ((exwnd = 0) and isexplorerwindow(ovIE.hwnd)) then
begin
found := true;
if (IDispatch(ovIE).QueryInterface(IWebBrowser2, pvWeb2) = S_OK) then
begin
psp := (pvWeb2 as IServiceProvider);
psp.QueryService(IID_IShellBrowser, IID_IShellBrowser, psb);
psb.QueryActiveShellView(isw);
if isw.GetItemObject(SVGIO_SELECTION, IDataObject, pointer(ido)) = S_OK then
begin
try
FmtEtc.cfFormat := CF_HDROP;
FmtEtc.ptd := nil;
FmtEtc.dwAspect := DVASPECT_CONTENT;
FmtEtc.lindex := -1;
FmtEtc.tymed := TYMED_HGLOBAL;
ido.GetData(FmtEtc, Medium);
GlobalLock(Medium.hGlobal);
try
n := DragQueryFile(Medium.hGlobal, $FFFFFFFF, nil, 0);
if nr < n then
begin
DragQueryFile(Medium.hGlobal, nr, p, max_path);
s := strpas(p);
end;
finally
DragFinish(Medium.hGlobal);
GlobalUnLock(Medium.hGlobal);
end;
finally
ReleaseStgMedium(Medium);
end;
end;
pvWeb2 := nil;
end;
end;
ovIE := Unassigned;
if found then
break;
end;
pvShell := nil;
finally
result := s;
end;
end;
要测试此代码,请创建一个新项目并在表单上放置一个按钮和一个备忘录。
将以下单位添加到uses子句中:
USES SHDocVW_TLB, ShlObj, activex, shellapi;
并将此代码添加到按钮事件处理程序:
PROCEDURE TForm2.Button1Click(Sender: TObject);
VAR
wnd, exwnd: hwnd;
n: integer;
s: STRING;
BEGIN
exwnd := 0;
wnd := getwindow(getdesktopwindow, gw_child);
REPEAT
IF isexplorerwindow(wnd) THEN
BEGIN
exwnd := wnd;
break;
END;
wnd := getwindow(wnd, gw_hwndnext);
UNTIL (wnd = 0) OR (exwnd <> 0);
IF exwnd <> 0 THEN
BEGIN
n := 0;
REPEAT
s := getexplorerselectedfile(exwnd, n);
memo1.Lines.Add(s);
inc(n);
UNTIL s = '';
END;
END;
如果按下按钮,备忘录将包含它找到的第一个打开资源管理器窗口的选定文件。当然,您应该打开一个资源管理器窗口,至少选择一个文件。