Windows: Open image with LC EXE

[Klaus major-k]

Hi Paul,

> Am 06.03.2019 um 18:13 schrieb Paul Dupuis via use-livecode <use-livecode at lists.runrev.com>:
> 
> If you select an LC standalone as the app t open an image with, the name and path to the image will be sent to the EXE as a command line parameter. See the dictionary/documentation on handling command line parameters in a standalone

thanks, yes, I guessed, but WHAT message is sent to our EXE?
Means WHERE can I handle the $1 or $2 CLI parameter?

> To tell Windows that your APP (standalone/EXE) can open and deal with jpg images, you must register that file type (.jpg) in the registry for your application. This is tricky on modern versions of Windows, because to use setRegistry to set a registry key, the application (process) calling setRegistry (an LC statement) must be a privileged process (i.e. have admin privs).

That was not part of the original question, so I think the TS does in fact know all this.

> Our app ships with a separate helper app (another LC standalone/EXE) that receives instructions from the main app via interprocess communications and makes all the setRegistry and getRegistry calls. That way, our main APP can start the helper app as a priviledged process and tell it to set the registry. This is to work around that a process (the main LC app/EXE) can not elevate its own privileges, so it can not ask to be given admin privs, but it can start another process that requests admin privs.
> 
> 
> On 3/6/2019 11:40 AM, Klaus major-k via use-livecode wrote:
>> Hi friends,
>> 
>> this came up in the german LC forum:
>> If you right-click an image file (Jpg) on the desktop
>> you will get a list of applications that can handle a Jpg image.
>> 
>> This list is provided by the "Windows Explorer" (I think, I'm a Mac guy).
>> 
>> Now if your LC exe happens to be in that list and we select our app,
>> what message, if at all, does our EXE receive when the "Explorer" "sends"
>> that image to our application whivh MAY be open already.
>> 
>> I mean how can we get to know what image file the user wants to open
>> with our EXE, so we can load it into an image object in our EXE?
>> 
>> Know what I mean?
>> Thanks for any hint!

Best

Klaus
> 

--
Klaus Major
http://www.major-k.de
klaus at major-k.de