Coinitialize Error

I have an application that I built using Delphi 2006 VCL and dtSearch COM api.  It has been working as expected until lately when I get the error "CoInitialize has not been called" when ever I use the SelectDirectory function then try to call the dtSearch COM procedures.  The SelectDirectory procedure had not precipitated the error before but now it does ever time.  I understand that the SelectDirectory function uses COM support in it internal call to the ShBrowseForFolder.  What I need is another way to have a dialog box (that does not use COM) that shows the existing directories available or a way to call CoInitiatize that works.  I called the Coinitialize in the startup of the application but I still got the error in the same situtation.
mcmahlingAsked:
Who is Participating?
 
alkisgConnect With a Mentor Commented:
function SelectDirectory(const Caption: string; const Root: WideString;
  var Directory: string; Options: TSelectDirExtOpts = [sdNewUI]; Parent: TWinControl = nil):

If sdNewUI is set in the options (the default), SelectDirectory calls
CoInitializeEx(nil, COINIT_APARTMENTTHREADED)
and after the dialog is shown
CoUninitialize

The Delphi code seems OK, there must be something wrong with the dtSearch COM api.

A workaround would be to pass empty options as a parameter, so that sdNewUI is not set:
if SelectDirectory('Select a Directory', 'C:\' , strChosenDirectory, []) then
  ...
0
 
MerijnBSr. Software EngineerCommented:
can you paste the line of code where you call SelectDirectory? Because over here I can use it without the need for CoInitialize().

btw, my help says this on CoInitialize():

CoInitialize
Initializes the COM library on the current thread and identifies the concurrency model as single-thread apartment (STA). Applications must initialize the COM library before they can call COM library functions other than CoGetMalloc and memory allocation functions.

New applications should call CoInitializeEx instead of CoInitialize.

Did you try using CoInitializeEx() ?
0
 
mcmahlingAuthor Commented:
TForm1.Button1Click(Sender: TObject);
var
strChosenDirectory: String;
begin
 if SelectDirectory('Select a Directory', 'C:\' , strChosenDirectory) then
 begin
   blContinueLoop := True;
 end;
end;

I tried CoInitializeEX(nil,0) it also did not work.
0
 
MerijnBSr. Software EngineerCommented:
if you make a new empty project with only these lines, do you still need to call CoInitialize()?
0
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

All Courses

From novice to tech pro — start learning today.