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CSV scanner: fix crash when selected filename cannot be opened

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This commit is contained in:
Ansgar Becker
2023-10-11 06:42:43 +02:00
parent 62f27dbf0a
commit fa571f72da
1 changed files with 47 additions and 41 deletions
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88
source/csv_detector.pas
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@ -125,6 +125,7 @@ begin
Screen.Cursor := crHourGlass;
btnScan.ImageIndex := 150;
btnScan.Enabled := False;
btnSave.Enabled := False;
// Parse contents to a TGridRows instance
GridRows := TGridRows.Create(True);
GridRow := nil;
@ -144,57 +145,62 @@ begin
InEncl := False;
MainForm.ShowStatusMsg(f_('Reading textfile (%s) ...', [FormatByteNumber(TestChunkSize)]));
Encoding := FLoadDataFrm.FileEncoding;
OpenTextfile(FLoadDataFrm.editFilename.Text, Stream, Encoding);
Contents := ReadTextfileChunk(Stream, Encoding, TestChunkSize);
Stream.Free;
ContentLen := Length(Contents);
MainForm.ShowStatusMsg;
try
MainForm.ShowStatusMsg(f_('Reading textfile (%s) ...', [FormatByteNumber(TestChunkSize)]));
Encoding := FLoadDataFrm.FileEncoding;
OpenTextfile(FLoadDataFrm.editFilename.Text, Stream, Encoding);
Contents := ReadTextfileChunk(Stream, Encoding, TestChunkSize);
Stream.Free;
ContentLen := Length(Contents);
MainForm.ShowStatusMsg;
P := 0;
ProgressCharsPerStep := ContentLen div FLoadDataFrm.ProgressBarSteps;
ProgressChars := 0;
MainForm.EnableProgress(FLoadDataFrm.ProgressBarSteps);
IgnoreLines := FLoadDataFrm.updownIgnoreLines.Position;
NextChar;
P := 0;
ProgressCharsPerStep := ContentLen div FLoadDataFrm.ProgressBarSteps;
ProgressChars := 0;
MainForm.EnableProgress(FLoadDataFrm.ProgressBarSteps);
IgnoreLines := FLoadDataFrm.updownIgnoreLines.Position;
NextChar;
while P <= ContentLen do begin
// Check characters left-side from current position
IsEncl := TestLeftChars(EnclTest, Encl, EnclLen);
IsTerm := TestLeftChars(TermTest, Term, TermLen);
IsLineTerm := TestLeftChars(LineTermTest, LineTerm, LineTermLen);
IsEof := P = ContentLen;
while P <= ContentLen do begin
// Check characters left-side from current position
IsEncl := TestLeftChars(EnclTest, Encl, EnclLen);
IsTerm := TestLeftChars(TermTest, Term, TermLen);
IsLineTerm := TestLeftChars(LineTermTest, LineTerm, LineTermLen);
IsEof := P = ContentLen;
Value := Value + Contents[P];
Value := Value + Contents[P];
if IsEncl then
InEncl := not InEncl;
if IsEncl then
InEncl := not InEncl;
if IsEof or (not InEncl) then begin
if IsLineTerm then begin
SetLength(Value, Length(Value)-LineTermLen);
AddValue;
end else if IsEof then begin
AddValue;
end else if IsTerm then begin
SetLength(Value, Length(Value)-TermLen);
AddValue;
if IsEof or (not InEncl) then begin
if IsLineTerm then begin
SetLength(Value, Length(Value)-LineTermLen);
AddValue;
end else if IsEof then begin
AddValue;
end else if IsTerm then begin
SetLength(Value, Length(Value)-TermLen);
AddValue;
end;
end;
if IsLineTerm and (not InEncl) then
AddRow;
NextChar;
end;
if IsLineTerm and (not InEncl) then
AddRow;
Contents := '';
NextChar;
// Find matching column types for values
Columns := DetectColumnAttributes(GridRows, IgnoreLines);
SynMemoCreateTable.Text := ComposeCreateStatement(Columns);
btnSave.Enabled := True;
except
on E:EFOpenError do
ErrorDialog(E.Message);
end;
Contents := '';
// Find matching column types for values
Columns := DetectColumnAttributes(GridRows, IgnoreLines);
SynMemoCreateTable.Text := ComposeCreateStatement(Columns);
GridRows.Free;
MainForm.ShowStatusMsg;