DECLAREINTEGER LoadResource IN kernel32;
[in] Handle to the module whose executable file contains the resource.
[in] Handle to the resource to be loaded. This handle is returned by the FindResource or FindResourceEx function.
If the function succeeds, the return value is a handle to the data associated with the resource.
If hModule is NULL, the system loads resource from the module that was used to create current process.
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I am thinking about approaches to design of VFP application with auto-updateable executable, the master copy of which is stored on a web server. Definitely I am not the first person doing this -- read Rick Strahl`s article Automatic Application Updates over the Web with Visual FoxPro 7.0 -- so my thoughts may not be precisely original.
Normally Windows executable can not update itself. That means it needs help from another process; let`s call this one the Updating Process.
Six tasks for UP to get done:
- connect to the web server and check for updates
- check and terminate all processes originated from the main executable, ME
- download new version of ME from the web server
- overwrite ME
- restart ME
- terminate itself
For reasons of mobility UP executable can be stored as a binary resource inside ME. It is doable. ME can use something like LoadResource plus CopyMemory plus STRTOFILE() plus CreateProcess to invoke UP.
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