文件处理函数（2）

WinAPI: CreateDirectory - 建立文件夹

//声明:
CreateDirectory(
  lpPathName: PChar;                        {目录名}
  lpSecurityAttributes: PSecurityAttributes {TSecurityAttributes 结构的指针}
): BOOL;

//TSecurityAttributes 是 _SECURITY_ATTRIBUTES 结构的重定义
_SECURITY_ATTRIBUTES = record
  nLength: DWORD;                {结构体的大小}
  lpSecurityDescriptor: Pointer; {安全描述}
  bInheritHandle: BOOL;          {安全描述的对象能否被新创建的进程继承}
end;


//举例:
var
  dir: string;
begin
  dir := 'c:\temp\TestDir';
  CreateDirectory(PChar(dir), nil); {第二个参数一般设为 nil, 表示使用系统默认的安全属性}
end;


WinAPI: CreateDirectoryEx - 根据模版建立文件夹

//声明:
CreateDirectoryEx (
  lpTemplateDirectory: PChar;               {模版目录名}
  lpPathName: PChar;                        {新目录名}
  lpSecurityAttributes: PSecurityAttributes {TSecurityAttributes 结构的指针}
): BOOL;                        

//TSecurityAttributes 是 _SECURITY_ATTRIBUTES 结构的重定义
_SECURITY_ATTRIBUTES = record
  nLength: DWORD;                {结构体的大小}
  lpSecurityDescriptor: Pointer; {安全描述}
  bInheritHandle: BOOL;          {安全描述的对象能否被新创建的进程继承}
end;


//举例:
var
  TDir,Dir: string;
begin
  TDir := 'c:\temp\Test';  {假如模版目录是隐藏的}
  Dir := 'c:\temp\NewDir'; {创建的新目录也是隐藏的}
  CreateDirectoryEx(PChar(TDir), PChar(Dir), nil);

{如果不需要模版, 可以:}
//CreateDirectoryEx(nil, PChar(Dir), nil);
end;


WinAPI: RemoveDirectory - 删除空目录

//声明:
RemoveDirectory(
  lpPathName: PAnsiChar {目录名}
): BOOL;    


//举例:
var
  Dir: string;
begin
  Dir := 'c:\temp\Test';
  if RemoveDirectory(PChar(Dir)) then
    ShowMessage(Dir + ' 已被删除')
  else
    ShowMessage('删除失败, 可能是 ' + Dir + ' 不存在或不为空');
end;


WinAPI: SetCurrentDirectory、GetCurrentDirectory - 设置与获取当前目录

//声明:
SetCurrentDirectory(
  lpPathName: PAnsiChar {路径名}
): BOOL;

GetCurrentDirectory(
  nBufferLength: DWORD; {缓冲区大小}
  lpBuffer: PAnsiChar   {缓冲区}
): DWORD;               {返回目录实际长度}            


//举例:
var
  buf: array[0..MAX_PATH] of Char;
begin
  SetCurrentDirectory('c:\temp');

  GetCurrentDirectory(SizeOf(buf), buf);
  ShowMessage(buf); {c:\temp}
end;



WinAPI: SetVolumeLabel - 设置磁盘卷标

//声明:
SetVolumeLabel(
  lpRootPathName: PChar; {根路径}
  lpVolumeName: PChar    {新卷标指针, nil 表示删除卷标}
): BOOL;


//举例:
begin
  SetVolumeLabel('c:\', 'NewLabel');
end;