TStringList->LoadFromFile throws exception

c++ builder

    Sponsored Links

    Next

  • 1. check list box
    can anuone help me with borland c++ . i need to have a checkbox followed by an icon followed by a label. is there any control that i can use so that i can have it in the same control?
  • 2. Creating Standard-Actions
    Is it possible to create my own Standard-Action? How can I do this? Thank you in advance.
  • 3. TOpenPictureDialog refuse to show JPEG files
    I'm using BC++ 6, tried to open some pictures for processing. I used a TOpenPictureDialog to select the picture, however, the dialog refuses to display any JPEG files. I used the Dialog "as is", I didn't changed any setting in it(except, I changed the Dialog Title). I have checked over and over again the Filter did contain .JPG and .JPEG in both its own filter and the ALL Picture Format filter. At design time, if I right click on the Dialog and select "Test Dialog", the filter does contail JPEG files and I could choose the JPEG files without problem. However, if I compiled the code and test the dialog in run time, the JPEG filters disappeared *magically* all togather. I can't select any JPEG files since the dialog just won't display the files, it only displays .BMP, .WMF, .EMF and .ICO files, all other extensions are ignored. So, what is the reason for such behavior, and how do I overcome it? T.I.A.
  • 4. BDS2006: Showing/bring to front and focusing an minimized or covered Form
    Hello, yep, a simple problem (I thought). But all my combinations of code don't work. I don't know why. Any hints? The most successfull so far... ShowWindow( this->Handle, SW_SHOWNORMAL); SetForegroundWindow( frmAPP_->Handle ) ; ...but now I can't minimize the Form anymore. Other snippets used... frmAPP_->Show() ; frmAPP_->SetFocus() ; Application->Restore() ; frmAPP_->BringToFront() ; Thanks and greetings Udo

TStringList->LoadFromFile throws exception

Postby mataus » Tue, 17 Jun 2008 08:23:31 GMT

Hello all.

I have problem with TStringList->LoadFromFile().  I have to make a program 
that shows information from text log file.  The file is always opened by a 
second program that keeps writtin .

When i call TStringList->LoadFromFile() i get exception "Cannot open file 
C:\Program Files\Company\event log.txt".  I think this is becuase log file 
is openned, by second program.  But notepad can open the file.

Can anyone help me?

matus 



Re: TStringList->LoadFromFile throws exception

Postby Remy Lebeau (TeamB) » Wed, 18 Jun 2008 02:08:38 GMT







TStrings::LoadFromFile() attempts to open the file with fmShareDenyWrite 
sharing rights specified.  Since your other app already has the file opened 
for writing, such access will always fail while the other app is using the 
file.  To get around it, you will have to use LoadFromStream() instead. 
That way, you can instantiate your own TFileStream with less restrictive 
sharing rights specified, ie:

    TFileStream *Stream = new TFileStream(FileName, fmOpenRead | 
fmShareDenyNone);
    try
    {
        Strings->LoadFromStream(Stream);
    }
    __finally
    {
        delete Stream;
    }


Gambit 



Re: TStringList->LoadFromFile throws exception

Postby Mark Jacobs » Wed, 18 Jun 2008 22:52:34 GMT





That is a lovely example. Thanks Remy.
-- 
Mark Jacobs
 http://www.**--****.com/  



Similar Threads:

1.throw new Exception() vs. throw Exception()

What is the difference between these two?:

throw new Exception("msg");

throw Exception("msg");


When should I use one vs. the other? 


2.TRegistry->WriteBool() throws exception

Hi all,

I know this might be trivial, but I couldn't locate any post on this with 
search, so I'll have to ask it.

I'm using TRegistry to access the Registry, when I tried to use 
WriteBool(ValName, Value), BCB always give me an exception upon compiling:

Project TCPrinter.exe raised an exception class ERegistryException with 
message 'Failed to set data for 'AutoMode''. Process stopped.

The problem sourced from this block of code:

void __fastcall TForm1::AutoCheckClick(TObject *Sender)
{
    TRegistry *reg = new TRegistry;
    reg->WriteBool("AutoMode", AutoCheck->Checked);
    delete reg;
}

AutoCheck is a TCheckBox, AutoMode is the Registry Value Name.

The strange thing is, it's thrown upon compiling, I haven't triggered the 
event yet. I do have a reg->ReadBool() in the constructor, but it never 
caused any problem. I deleted the reg at the end of the constructor, so it's 
not object conflict problem...

Anyone have any idea what's wrong? Thanks in advance. 


3.Can basic_string<>::c_str() throw exceptions?

  Hi all.

  I was wondering. Can the standard basic_string<> c_str()
member function throw any exceptions? Is it perhaps
implementation dependent?

  I tried checking the standard and as far as I can see it is
implementation dependent with no guarantees what so
ever, but I was hoping I may have missed something... :-)

  When the C++ standard does not specify any exception
specifications for some function, nor does it list any
exceptions in the function description. Does that mean
that any exception may be thrown? If that is so, how are
we supposed to prepare for those exceptions in our code
other than 'something happened, I do not know what, but
it was not expected so I'm aborting...'.

  Hope to hear from you soon.

  Regards,
    Jurko Gospodneti?


4.TBitmap.LoadFromFile() throws Stream Error?

Hello all, 

I'm new to Delphi 2005, and have a problem I'm having a difficult time
solving.

I have an OwnerDraw TListbox  where basically I'm just drawing
thumbnails of .BMP files in a folder. It works fine, except on SOME
files, the TBitmap.LoadFromFile() throws a stream error.

I can't seem to find out why it does it on these particular .BMP
files. Here's a snippet of the very vanilla code...

...
 with (Control as TListBox).Canvas do
  begin
    FillRect(Rect);
     If Not FileExists(myListbox.Items[Index]) Then Exit;
        Bitmap:=TBitmap.Create;
        if Bitmap<>nil then
        begin
          //
          // Bitmap.PixelFormat := pf24bit; //tryed setting this..it
          // didnt help
          //
          Bitmap.LoadFromFile( myListbox.Items[Index] ); 
           R:=Bounds(
              Rect.Left+10,
              Rect.Top+4,
              Round(100*BitRatio),
              Rect.Bottom-Rect.top-2);
          StretchDraw(R,Bitmap);
          Bitmap.Free;
     end;
   end;
...

The BMP files are small...just approx 98x98
I have found that if I open the troublesome .BMP files and reduce the
color depth to 32K and resave, it makes the stream error disappear. Is
there anything I'm doing obviously wrong in the code? Or is it just
the .BMP files were saved 'strangley'?



5.TSTringList LoadFromFile

"Chad Eddy" < XXXX@XXXXX.COM > wrote in message
news:3f15b185$ XXXX@XXXXX.COM ...
> I am using a TStringList to load files and do some file
> I/O on them.  This works with most files, but not with
> the .doc and .chm's that I try.

Those are not plain-text formats.  Well, .doc may be, but only if it is
encoded in RTF formatting.

> After the load from file, I have a count of 1 line, which
> has a small amount of charachters.

Probably because those formats have binary data in them that is preventing
LoadFromFile() from parsing the entire file.  LoadFromFile() only works
correctly for plain-text files.

> Is there something I have to do different for some files?

Yes - don't use TStringList for what you are trying to do.  Access the file
directly.


Gambit


6. Faster TStringList.LoadFromFile

7. TRichEdit->Lines->LoadFromFile( ) filesize warning...

8. Hidden TPanel does not resize when TImage->Picture->LoadFromFile



Return to c++ builder

 

Who is online

Users browsing this forum: No registered users and 67 guest