How to install Virtual Treeview?

Question

Virtual treeview by Mike Lischke seems so popular on the web and as third party component. I just downloaded version 4.8.7 on my machine.

I have Delphi 2010 and Delphi 7.0 in 2 partitions.

Aftter clicking installer of virtual treeview, a log file prompts, saying it has been installed successfully.

I check Delphi 2010, yes, it is on component palette showing 3 controls.

But when I start Delphi 7.0, IDE prompts 'Can not load VirtualtreesD7.bpl...'. I ignore it, and find that Virtual treeview design time package is in list but UNCHECKED. If I try to check it, again it promts "Can not load virtualtreesD7...".

I search whole Disk and find a VirtualTreesD7D.bpl, and manually add it in design time package list. It is on palette with 3 controls.

I tested it quickly and exit Delphi 7.0. But when I restart Delphi 7.0, again it prompts "Can not load VirtualtreesD7.bpl...", it is again not on palatte and not Checked in design time package list.

This is very simple question. Can you let me know how to solve it? Thank you very much in advance.

Edit:

Thanks for comments.

I tested your comments, but not work.

New problem:

If I uninstall virtual treeview by clicking unins000.exe and reinstall it only in Delphi 7.0, the installer prompts in the last screen ''...completed.." and no error prompts. When I start Delphi 7, the virtual treeview design time package is not in package list. This is even worse than the last time (last time it is in package list but not checked).

I check very carefully one line by one line of that log file, it says:

...
...
VirtualTreesD7.dpk(39) 
VirtualTreesD7.dpk(39) 
VirtualTreesD7.dpk(41) 
VirtualTreesD7.dpk(43) 

**VirtualTreesD7D.dpk(32) Fatal: Required package 'VirtualTreesD7' not found**

Why? Why it does not successfully install and does not prompts the error in installation in the last install screen.

How to solve this "Fatal...not found" problem.

Thank you all for help.

New Edit: (Is this Answer?)

Thanks for your help and suggestion first.

I take 2 hours to test and find a possible solution. It works on my machine and it can be installed in Delphi 7.0.

Steps:

1. uninstall virtual treeview by clicking unins000.exe from Delphi 7.0 ( you can separately install virtual treeview in Delphi 2010)

2. clicking newly downloaded VirtualTreeview setup 4.8.7.exe, install it in Delphi 7 folder, do not install it in default...Rad..path.  Important: INGNORE ALL ERROR PROMPTS DURING INSTALLATION (INCLUDING ERROR PROMPT IN THAT LARGE INSTALLATION LOG FILE).

3. Go to $\Virtual Treeview, right click VirtualTreesD7D.dpk, select Open with Delphi 32 development environment. A window prompts for you to compile. JUST CLICK COMPILE, DO NOT CLICK INSTALL.

4. Go to Component -> Install Packages. Go to $\Bpl folder and manually add VirtualTreesD7D.bpl into Design Package. The three controls will appear in Palette.

5. Go to folder $\Bpl and YOU MUST COPY VirtualTreesD7.bpl (NOT VirtualTreesD7D.bpl) INTO $\Bin folder.

6. Close Delphi 7 and restart it, you will find that this component is on Palette and in Package list, it is in Design package list and CHECKED.

I personally feel that the installer of Virtual treeview needs improvements to free users from such trouble and test in installation. The installer needs rewrite.

This is my case of installation. I do not know if it can be generalized to all users.

Thank you all.

Answer 1

The IDE uses LoadLibrary (actually, LoadPackage) to load packages for components that are installed. This means that it follows the same logic for where it looks for files that LoadLibrary does.

The problem is that the IDE can't find the package using LoadLibrary's search logic - see the Remarks section here. So the solution is to add the folder to Delphi's Library Path (Tools->Options->Environment Options->Delphi Options->Library - Win32), or move it somewhere on the system PATH.