procedure TForm1.Button4Click(Sender: TObject);
var aa,bb : TFileStream ;
buffer : array of byte;
readnum : integer;
begin
aa := TFileStream.Create('d:\2.doc',fmOpenRead );
SetLength(buffer,aa.Size);//aa.size确实有值
aa.Position := 0;
readnum := aa.Read(buffer,aa.Size);
ShowMessage(inttostr(readnum));
end;
怎么返回的readnum 为0?buffer就是没有写入!!!
var aa,bb : TFileStream ;
buffer : array of byte;
readnum : integer;
begin
aa := TFileStream.Create('d:\2.doc',fmOpenRead );
SetLength(buffer,aa.Size);//aa.size确实有值
aa.Position := 0;
readnum := aa.Read(buffer,aa.Size);
ShowMessage(inttostr(readnum));
end;
怎么返回的readnum 为0?buffer就是没有写入!!!
var aa,bb : TFileStream ;
buffer : array of byte;
readnum : integer;
begin
aa := TFileStream.Create('d:\2.doc',fmOpenRead );
// SetLength(buffer,aa.Size);//aa.size确实有值
// aa.Position := 0;
// readnum := aa.Read(buffer,aa.Size);
readnum :=aa.size;
ShowMessage(inttostr(readnum));
end;
//aa := TFileStream.Create('d:\2.doc',fmOpenRead ); SetLength(buffer,aa.Size);//aa.size确实有值
aa.Position := 0;
readnum := aa.Read(buffer,aa.Size);
ShowMessage(inttostr(readnum)); //不是0 啊,是文件的大小阿,只不过会有一个异常
还有楼上说的对啊,
要往buffer中写应用aa.write(buffer,aa.Size)啊