🚀 go-pugleaf

On a subject somewhat related to my previous post... 

I guess a preliminary question would have to be whether there is 
a package library that I could install with C++ Builder 2007 that 
would give me access to the "legacy" TNMHTTP control  (how can I 
find out what packages contain what, and whether or not something 
is available?)

Anyway, the issue I have right now is the following:  I replaced 
the TNMHTTP control with an Indy control TIdHTTP, for an 
auxiliary class that I have that retrieves an image from a 
web site and places it in a TImage control (providing local 
caching of images, etc.).

The HTTP control is in a class that inherits from Thread.  In 
the Execute method of this class, I do  (exception-handling and 
other housekeeping omitted):

    http = new TIdHTTP (Application);  // http is a data member
    TFileStream * file = new .... (localfile.c_str() ... );
        // localfile is also a data member, an std::string
    http->Get (url, file);
    delete file;
    Synchronize (SetImage);


Where my SetImage method looks like this:

    image->Picture->LoadFromFile (localfile.c_str());
        // image is a data member, a TImage * that was 
        // passed to the constructor, so that this object 
        // places the image in that control

With TNMHTTP, the above was working flawlessly;  it's on a 
separate thread, so it does not block the GUI.  In particular, 
if I have multiple downloads going on concurrently, I see them 
appear one by one.

However, with the Indy HTTP control, it would seem like it does 
block everything --- I can't even grab the main window and move 
it;  everything freezes until *all* downloads are completed and 
the images do show up  (all of them simultaneously).

How could this happen?   The HTTP control is running on a 
separate thread --- how come it blocks the entire GUI? (the 
constructor sets Priority to tpLower, by the way)

I also tried passing NULL to TIdHTTP's constructor  (really 
a shot in the dark).  The behaviour remains identical --- it 
works, but it freezes the GUI until all downloads are completed 
and all the images show up.

Any explanation for this?

Thanks!

Carlos
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