如何实现：如果目录下有文件就删除目录下所有文件

[flywishes]

判断是否存在C:\abc目录，如果存在则删除目录下的所有文件,
如果不存在，则创建新的abc目录.

[coreblood]

---- 1、拷贝目录

---- 为了能拷贝目录下带有子目录的情况，先定义一个辅助的拷贝函数，它是递归执行的，直到把目录下的所有文件和子目录都拷贝完。

---- 1.1拷贝目录的递归辅助函数：DoCopyDir

function DoCopyDir(sDirName:String;
sToDirName:String):Boolean;
var
hFindFile:Cardinal;
t,tfile:String;
sCurDir:String[255];
FindFileData:WIN32_FIND_DATA;
begin
//先保存当前目录
sCurDir:=GetCurrentDir;
ChDir(sDirName);
hFindFile:=FindFirstFile('*.*',FindFileData);
if hFindFile< >INVALID_HANDLE_VALUE then
begin
if not DirectoryExists(sToDirName) then
ForceDirectories(sToDirName);
repeat
tfile:=FindFileData.cFileName;
if (tfile='.') or (tfile='..') then
Continue;
if FindFileData.dwFileAttributes=
FILE_ATTRIBUTE_DIRECTORY then
begin
t:=sToDirName+'\'+tfile;
if not DirectoryExists(t) then
ForceDirectories(t);
if sDirName[Length(sDirName)]< >'\' then
DoCopyDir(sDirName+'\'+tfile,t)
else
DoCopyDir(sDirName+tfile,sToDirName+tfile);
end
else
begin
t:=sToDirName+'\'+tFile;
CopyFile(PChar(tfile),PChar(t),True);
end;
until FindNextFile(hFindFile,FindFileData)=false;
FindClose(hFindFile);
end
else
begin
ChDir(sCurDir);
result:=false;
exit;
end;
//回到原来的目录下
ChDir(sCurDir);
result:=true;
end;

---- 1.2拷贝目录的函数：CopyDir

function CopyDir(sDirName:String;
sToDirName:string):Boolean;
begin
if Length(sDirName)< =0 then
exit;
//拷贝...
Result:=DoCopyDir(sDirName,sToDirName);
end;

[coreblood]

---- 2、删除目录

---- 删除目录与拷贝目录很类似，但为了能删除位于根目录下的一个空目录，需要在辅助函数中设置一个标志变量，即：如果删除的是空目录,则置bEmptyDir为True，这一句已经用深色框表示了。

---- 2.1删除目录的递归辅助函数：DoRemoveDir

function DoRemoveDir(sDirName:String):Boolean;
var
hFindFile:Cardinal;
tfile:String;
sCurDir:String;
bEmptyDir:Boolean;
FindFileData:WIN32_FIND_DATA;
begin
//如果删除的是空目录,则置bEmptyDir为True
//初始时,bEmptyDir为True
bEmptyDir:=True;
//先保存当前目录
sCurDir:=GetCurrentDir;
SetLength(sCurDir,Length(sCurDir));
ChDir(sDirName);
hFindFile:=FindFirstFile('*.*',FindFileData);
if hFindFile< >INVALID_HANDLE_VALUE then
begin
repeat
tfile:=FindFileData.cFileName;
if (tfile='.') or (tfile='..') then
begin
bEmptyDir:=bEmptyDir and True;
Continue;
end;
//不是空目录,置bEmptyDir为False
bEmptyDir:=False;
if FindFileData.dwFileAttributes=
FILE_ATTRIBUTE_DIRECTORY then
begin
if sDirName[Length(sDirName)]< >'\' then
DoRemoveDir(sDirName+'\'+tfile)
else
DoRemoveDir(sDirName+tfile);
if not RemoveDirectory(PChar(tfile)) then
result:=false
else
result:=true;
end
else
begin
if not DeleteFile(PChar(tfile)) then
result:=false
else
result:=true;
end;
until FindNextFile(hFindFile,FindFileData)=false;
FindClose(hFindFile);
end
else
begin
ChDir(sCurDir);
result:=false;
exit;
end;
//如果是空目录,则删除该空目录
if bEmptyDir then
begin
//返回上一级目录
ChDir('..');
//删除空目录
RemoveDirectory(PChar(sDirName));
end;

//回到原来的目录下
ChDir(sCurDir);
result:=true;
end;

---- 2.2删除目录的函数：DeleteDir

function DeleteDir(sDirName:String):Boolean;
begin
if Length(sDirName)< =0 then
exit;
//删除...
Result:=DoRemoveDir(sDirName) and RemoveDir(sDirName);
end;

[coreblood]

---- 3、移动目录

---- 有了拷贝目录和删除目录的函数，移动目录就变得很简单，只需顺序调用前两个函数即可：

function MoveDir(sDirName:String;
sToDirName:string):Boolean;
begin
if CopyDir(sDirName,sToDirName) then
if RemoveDir(sDirName) then
result:=True
else
result:=false;
end;

///////////////////////////////////////////////
procedure TForm1.Button2Click(Sender: TObject);
var
OpStruc: TSHFileOpStruct;
frombuf, tobuf: Array [0..128] of Char;
Begin
FillChar( frombuf, Sizeof(frombuf), 0 );
FillChar( tobuf, Sizeof(tobuf), 0 );
StrPCopy( frombuf, 'd:\brief\*.*' );
StrPCopy( tobuf, 'd:\temp\brief' );
With OpStruc DO Begin
Wnd:= Handle;
wFunc:= FO_COPY;
pFrom:= @frombuf;
pTo:=@tobuf;
fFlags:= FOF_NOCONFIRMATION or FOF_RENAMEONCOLLISION;
fAnyOperationsAborted:= False;
hNameMappings:= Nil;
lpszProgressTitle:= Nil;

end;
ShFileOperation( OpStruc );
end;

[kellerlee]

uses ShellApi;


procedure TTransComMainForm.DeleteTemplete;
var
myrec: TSHFILEOPSTRUCT;
begin
with myrec do
begin
Wnd:= Handle;
wFunc:= FO_DELETE;
pFrom:= PChar(C:\test\*.*');//路径
pTo:='';
fFlags:= FOF_NOCONFIRMATION or FOF_FILESONLY;
fAnyOperationsAborted:= False;
hNameMappings:= nil;
lpszProgressTitle:= nil;
end;
SHFileOperation(myrec);
end;

[xiaoyan21]

{ 返回删除指定目录是否成功 }
function DeletePath(mDirName: string): Boolean;
var
vSearchRec: TSearchRec;
vPathName: string;
K: Integer;
begin
Result := True;
vPathName := mDirName + '\*.*';
K := FindFirst(vPathName, faAnyFile, vSearchRec);
while K = 0 do
begin
if (vSearchRec.Attr and faDirectory > 0) and
(Pos(vSearchRec.Name, '..') = 0) then begin
FileSetAttr(mDirName + '\' + vSearchRec.Name, faDirectory);
Result := DeletePath(mDirName + '\' + vSearchRec.Name);
end else if Pos(vSearchRec.Name, '..') = 0 then begin
FileSetAttr(mDirName + '\' + vSearchRec.Name, 0);
Result := DeleteFile(PChar(mDirName + '\' + vSearchRec.Name));
end;
if not Result then Break;
K := FindNext(vSearchRec);
end;
FindClose(vSearchRec);
//Result := RemoveDir(mDirName);
end;

再发啊...

[madyak]

删除功能注意:目录后要加'\'

{**Summary ======================================================
name : DeleteFiles
PARAMS : const Path, Mask : string; recursive : boolean

RETURNS : -
PURPOSE : delete several files with joker.
Optional recursive = search in subdirectories.

EXAMPLE : DeleteFiles ('c:\temp\', '*.txt', True);
UPDATES :
===============================================================*}
procedure DeleteFiles (const Path, Mask : string; recursive : boolean);
var
Result : integer;
SearchRec : TSearchRec;
begin
Result := FindFirst(Path + Mask, faAnyFile - faDirectory, SearchRec);
while Result = 0 do
begin
if not DeleteFile (Path + SearchRec.name) then
begin
FileSetAttr (Path + SearchRec.name, 0); { reset all flags }
DeleteFile (Path + SearchRec.name);
end;
Result := FindNext(SearchRec);
end;
FindClose(SearchRec);

if not recursive then
exit;

Result := FindFirst(Path + '*.*', faDirectory, SearchRec);
while Result = 0 do
begin
if (SearchRec.name <> '.') and (SearchRec.name <> '..') then
begin
FileSetAttr (Path + SearchRec.name, faDirectory);
DeleteFiles (Path + SearchRec.name + '\', Mask, TRUE);
RmDir (Path + SearchRec.name);
end;
Result := FindNext(SearchRec);
end;
FindClose(SearchRec);
end;

[yesxwl]

procedure TForm1.BitBtn1Click(Sender: TObject);
var
sr:TsearchRec;
begin

if directoryExists('g:\a') then
begin
if FindFirst('g:\a\*.*',faAnyFile,sr)=0 then
begin

repeat
deleteFile('g:\a\'+sr.Name);
until FindNext(sr)<>0;
Findclose(sr);
end
else
CreateDir('g:\a');

end
else
CreateDir('g:\a');
end;