看到的,参考
---- 经过一段时间的摸索,我们解决了这个问题,并经过完善,在应用中运行较好。程序如下:
procedure TsampleForm.OpenDOCClick(Sender: TObject);
var
MemSize: Integer;
Buffer: PChar;
MyFile: TFileStream;
Stream: TBlobStream;
begin
OpenDialog1.Filter:='WORD文档(*.DOC)|*.DOC';{从对话窗选择文件}
if OpenDialog1.Execute then
begin
MyFile:=TFileStream.Create(OpenDialog1.FileName,fmOpenRead);
with table1 do {‘table1’为含BLOB字段的表名}
begin
Open;
Edit;
Stream := TBlobStream.Create(FieldByName('Doc') as TBlobField,
bmWrite);{‘Doc’为BLOB字段名}
MemSize := MyFile.Size;
Inc(MemSize); {Make room for the buffer's null terminator.}
Buffer := AllocMem(MemSize); {Allocate the memory.}
try
Stream.Seek(0, soFromBeginning); {Seek 0 bytes from the stream's
end point}
MyFile.Read(Buffer^,MemSize);
Stream.Write(Buffer^,MemSize);
finally
MyFile.Free;
Stream.Free;
end;
try
Post;
except
on E: EDatabaseError do
if HandelException(E)< >0 then
exit
else
raise;
end;
end;
Doc_ole.CreateObjectFromFile(OpenDialog1.FileName,False);
Doc_ole.Run;{Doc_ole为ToleContainer构件名}
end;
end; ---- 以上为向数据库中写入的程序,应用中从对话窗取出文件在ToleContainer构件中显示的同时存入数据库。
procedure TsampleForm.GetDocClick(Sender: TObject);
var
MemSize: Integer;
Buffer: PChar;
MyFile: TFileStream;
Stream: TBlobStream;
begin
MyFile:=TFileStream.Create('c:\temp.tmp',fmCreate);
with Query1 do
begin
Stream := TBlobStream.Create(FieldByName('Doc') as TBlobField, bmRead);
MemSize := Stream.Size;
Inc(MemSize); {Make room for the buffer's null terminator.}
Buffer := AllocMem(MemSize); {Allocate the memory.}
try
Stream.Read(Buffer^,MemSize);
MyFile.Write(Buffer^,MemSize);
finally
MyFile.Free;
Stream.Free;
end;
end;
if FileExists('c:\temp.DOC') then
DeleteFile('c:\temp.DOC');
if FileExists('c:\temp.tmp') then
begin
RenameFile('c:\temp.tmp', 'c:\temp.DOC');
Doc_ole.CreateObjectFromFile('c:\temp.DOC',False);
Doc_ole.Run;
end;
end; ---- 以上程序为从数据库从将WORD文档取出,并放在temp.doc的临时文件上并在ToleContainer构件中显示。
---- 在程序的其他部份应准确控制表记录指针,使WORD文档的存取发生在正确的记录位置。
---- 经过一段时间的摸索,我们解决了这个问题,并经过完善,在应用中运行较好。程序如下:
procedure TsampleForm.OpenDOCClick(Sender: TObject);
var
MemSize: Integer;
Buffer: PChar;
MyFile: TFileStream;
Stream: TBlobStream;
begin
OpenDialog1.Filter:='WORD文档(*.DOC)|*.DOC';{从对话窗选择文件}
if OpenDialog1.Execute then
begin
MyFile:=TFileStream.Create(OpenDialog1.FileName,fmOpenRead);
with table1 do {‘table1’为含BLOB字段的表名}
begin
Open;
Edit;
Stream := TBlobStream.Create(FieldByName('Doc') as TBlobField,
bmWrite);{‘Doc’为BLOB字段名}
MemSize := MyFile.Size;
Inc(MemSize); {Make room for the buffer's null terminator.}
Buffer := AllocMem(MemSize); {Allocate the memory.}
try
Stream.Seek(0, soFromBeginning); {Seek 0 bytes from the stream's
end point}
MyFile.Read(Buffer^,MemSize);
Stream.Write(Buffer^,MemSize);
finally
MyFile.Free;
Stream.Free;
end;
try
Post;
except
on E: EDatabaseError do
if HandelException(E)< >0 then
exit
else
raise;
end;
end;
Doc_ole.CreateObjectFromFile(OpenDialog1.FileName,False);
Doc_ole.Run;{Doc_ole为ToleContainer构件名}
end;
end; ---- 以上为向数据库中写入的程序,应用中从对话窗取出文件在ToleContainer构件中显示的同时存入数据库。
procedure TsampleForm.GetDocClick(Sender: TObject);
var
MemSize: Integer;
Buffer: PChar;
MyFile: TFileStream;
Stream: TBlobStream;
begin
MyFile:=TFileStream.Create('c:\temp.tmp',fmCreate);
with Query1 do
begin
Stream := TBlobStream.Create(FieldByName('Doc') as TBlobField, bmRead);
MemSize := Stream.Size;
Inc(MemSize); {Make room for the buffer's null terminator.}
Buffer := AllocMem(MemSize); {Allocate the memory.}
try
Stream.Read(Buffer^,MemSize);
MyFile.Write(Buffer^,MemSize);
finally
MyFile.Free;
Stream.Free;
end;
end;
if FileExists('c:\temp.DOC') then
DeleteFile('c:\temp.DOC');
if FileExists('c:\temp.tmp') then
begin
RenameFile('c:\temp.tmp', 'c:\temp.DOC');
Doc_ole.CreateObjectFromFile('c:\temp.DOC',False);
Doc_ole.Run;
end;
end; ---- 以上程序为从数据库从将WORD文档取出,并放在temp.doc的临时文件上并在ToleContainer构件中显示。
---- 在程序的其他部份应准确控制表记录指针,使WORD文档的存取发生在正确的记录位置。
中有如下提示:
query1:field('doc')not found
不知怎么回事,请赐教!