复杂的结构化存取(三) : 存取函数
作者：互联网
复杂的结构化存取(三) : 存取函数
今天写了四个小函数, 拿来与大家共享:Dir2Doc: 把文件夹下的所有文件(不包括子文件夹)保存成一个复合文件;
Doc2Dir: Dir2Doc 的反操作;
ZipDir2Doc: 同 Dir2Doc, 只是同时执行了压缩;
UnZipDoc2Dir: ZipDir2Doc 的反操作.
函数及测试代码(分别在 Delphi 2007 和 Delphi 2009 下测试通过):
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;
type
TForm1 = class(TForm)
Button1: TButton;
Button2: TButton;
Button3: TButton;
Button4: TButton;
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
procedure Button3Click(Sender: TObject);
procedure Button4Click(Sender: TObject);
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
uses ActiveX, Zlib; {函数用到的单元}
{把指定文件夹下的文件保存到一个复合文件}
function Dir2Doc(SourcePath, DestFile: string): Boolean;
const
Mode = STGM_CREATE or STGM_WRITE or STGM_SHARE_EXCLUSIVE;
var
sr: TSearchRec;
Stg: IStorage;
Stm: IStream;
ms: TMemoryStream;
begin
Result := False;
SourcePath := ExcludeTrailingPathDelimiter(SourcePath); {去掉最后一个 '\'}
if not DirectoryExists(SourcePath) then Exit; {如果源路径不存在则退出}
if not DirectoryExists(ExtractFileDir(DestFile)) then {假如目标目录不存在}
if not ForceDirectories(ExtractFileDir(DestFile)) then Exit; {就创建, 若创建失败退出.}
{如果目标路径不存在则退出}
StgCreateDocfile(PWideChar(WideString(DestFile)), Mode, 0, Stg); {建立复合文件根路径}
if FindFirst(SourcePath + '\*.*', faAnyFile, sr) = 0 then
begin
repeat
if sr.Name[1] = '.' then Continue; {如果是'.' 或 '..' (当前目录或上层目录)则忽略}
if (sr.Attr and faDirectory) <> faDirectory then
begin
Stg.CreateStream(PWideChar(WideString(sr.Name)), Mode, 0, 0, Stm);
ms := TMemoryStream.Create;
ms.LoadFromFile(SourcePath + '\' + sr.Name);
ms.Position := 0;
Stm.Write(ms.Memory, ms.Size, nil);
ms.Free;
end;
until (FindNext(sr) <> 0);
end;
Result := True;
end;
{上一个 Dir2Doc 函数的反操作}
function Doc2Dir(SourceFile, DestPath: string): Boolean;
const
Mode = STGM_READ or STGM_SHARE_EXCLUSIVE;
var
Stg: IStorage;
Stm: IStream;
StatStg: TStatStg;
EnumStatStg: IEnumStatStg;
ms: TMemoryStream;
i: Integer;
begin
Result := False;
if not FileExists(SourceFile) then Exit; {如果文件不存在退出}
if not DirectoryExists(DestPath) then {如果目标目录不存在}
if not ForceDirectories(DestPath) then Exit; {就创建, 若创建失败退出}
DestPath := ExcludeTrailingPathDelimiter(DestPath); {去掉最后一个 '\'}
StgOpenStorage(PWideChar(WideString(SourceFile)), nil, Mode, nil, 0, Stg);
Stg.EnumElements(0, nil, 0, EnumStatStg);
while True do
begin
EnumStatStg.Next(1, StatStg, @i);
if (i = 0) or (StatStg.dwType = 1) then Break; {dwType = 1 时是文件夹}
Stg.OpenStream(StatStg.pwcsName, nil, Mode, 0, Stm);
ms := TMemoryStream.Create;
ms.SetSize(StatStg.cbSize);
Stm.Read(ms.Memory, ms.Size, nil);
ms.SaveToFile(DestPath + '\' + StatStg.pwcsName);
ms.Free;
end;
Result := True;
end;
{把指定文件夹下的文件压缩到一个复合文件}
function ZipDir2Doc(SourcePath, DestFile: string): Boolean;
const
Mode = STGM_CREATE or STGM_WRITE or STGM_SHARE_EXCLUSIVE;
var
sr: TSearchRec;
Stg: IStorage;
Stm: IStream;
ms1,ms2: TMemoryStream;
zip: TCompressionStream;
num: Int64;
begin
Result := False;
SourcePath := ExcludeTrailingPathDelimiter(SourcePath); {去掉最后一个 '\'}
if not DirectoryExists(SourcePath) then Exit; {如果源路径不存在则退出}
if not DirectoryExists(ExtractFileDir(DestFile)) then {假如目标目录不存在}
if not ForceDirectories(ExtractFileDir(DestFile)) then Exit; {就创建, 若创建失败退出.}
StgCreateDocfile(PWideChar(WideString(DestFile)), Mode, 0, Stg); {建立复合文件根路径}
if FindFirst(SourcePath + '\*.*', faAnyFile, sr) = 0 then
begin
repeat
if sr.Name[1] = '.' then Continue; {如果是'.' 或 '..' (当前目录或上层目录)则忽略}
if (sr.Attr and faDirectory) <> faDirectory then
begin
Stg.CreateStream(PWideChar(WideString(sr.Name)), Mode, 0, 0, Stm);
ms1 := TMemoryStream.Create;
ms2 := TMemoryStream.Create;
ms1.LoadFromFile(SourcePath + '\' + sr.Name);
num := ms1.Size;
ms2.Write(num, SizeOf(num));
zip := TCompressionStream.Create(clMax, ms2);
ms1.SaveToStream(zip);
zip.Free;
ms2.Position := 0;
Stm.Write(ms2.Memory, ms2.Size, nil);
ms1.Free;
ms2.Free;
end;
until (FindNext(sr) <> 0);
end;
Result := True;
end;
{上一个 ZipDir2Doc 函数的反操作}
function UnZipDoc2Dir(SourceFile, DestPath: string): Boolean;
const
Mode = STGM_READ or STGM_SHARE_EXCLUSIVE;
var
Stg: IStorage;
Stm: IStream;
StatStg: TStatStg;
EnumStatStg: IEnumStatStg;
ms1,ms2: TMemoryStream;
i: Integer;
num: Int64;
UnZip: TDecompressionStream;
begin
Result := False;
if not FileExists(SourceFile) then Exit; {如果文件不存在退出}
if not DirectoryExists(DestPath) then {如果目标目录不存在}
if not ForceDirectories(DestPath) then Exit; {就创建, 若创建失败退出}
DestPath := ExcludeTrailingPathDelimiter(DestPath); {去掉最后一个 '\'}
StgOpenStorage(PWideChar(WideString(SourceFile)), nil, Mode, nil, 0, Stg);
Stg.EnumElements(0, nil, 0, EnumStatStg);
while True do
begin
EnumStatStg.Next(1, StatStg, @i);
if (i = 0) or (StatStg.dwType = 1) then Break; {dwType = 1 时是文件夹}
Stg.OpenStream(StatStg.pwcsName, nil, Mode, 0, Stm);
ms1 := TMemoryStream.Create;
ms1.SetSize(StatStg.cbSize);
Stm.Read(ms1.Memory, ms1.Size, nil);
ms1.Position := 0;
ms1.ReadBuffer(num, SizeOf(num));
ms2 := TMemoryStream.Create;
ms2.SetSize(num);
UnZip := TDecompressionStream.Create(ms1);
ms2.Position := 0;
UnZip.Read(ms2.Memory^, num);
UnZip.Free;
ms2.SaveToFile(DestPath + '\' + StatStg.pwcsName);
ms1.Free;
ms2.Free;
end;
Result := True;
end;
{测试 Dir2Doc}
procedure TForm1.Button1Click(Sender: TObject);
const
TestPath = 'C:\Documents and Settings\All Users\Documents\My Pictures\示例图片';
TestFile = 'C:\Temp\pic1.dat';
begin
if Dir2Doc(TestPath, TestFile) then
ShowMessage('ok');
end;
{测试 Doc2Dir}
procedure TForm1.Button2Click(Sender: TObject);
const
TestPath = 'C:\Temp\pic1';
TestFile = 'C:\Temp\pic1.dat';
begin
if Doc2Dir(TestFile, TestPath) then
ShowMessage('ok');
end;
{测试 ZipDir2Doc}
procedure TForm1.Button3Click(Sender: TObject);
const
TestPath = 'C:\Documents and Settings\All Users\Documents\My Pictures\示例图片';
TestFile = 'C:\Temp\pic2.dat';
begin
if ZipDir2Doc(TestPath, TestFile) then
ShowMessage('ok');
end;
{测试 UnZipDoc2Dir}
procedure TForm1.Button4Click(Sender: TObject);
const
TestPath = 'C:\Temp\pic2';
TestFile = 'C:\Temp\pic2.dat';
begin
if UnZipDoc2Dir(TestFile, TestPath) then
ShowMessage('ok');
end;
end.
posted on
2008-08-25 22:44
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标签：begin,结构化,Stg,end,函数,ms2,ms1,ms,存取 来源： https://blog.51cto.com/u_14617575/2747846