` SendMessage and RegisterWindowMessage (Richard Rogers) - Icetips Article
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Windows API: SendMessage and RegisterWindowMessage
2004-05-10 -- Richard Rogers
 
Newsgroups: softvelocity.clarion.language You might wat to try this... API PROTOTYPES SendMessage(SIGNED,SIGNED,SIGNED,LONG),LONG,PASCAL,NAME('SendMessageA') RegisterWindowMessage(LONG),UNSIGNED,PASCAL,RAW,PROC,NAME('RegisterWindowMessageA') DATA DECLS MessageRegister CSTRING(255) MOD:wHandle LONG MyDoSomethingSilly LONG CODE MessageRegister = 'DoSomethingSilly' MyDoSomethingSilly = RegisterWindowMessage(ADDRESS(MessageRegister)) RET# = SendMessage(MOD:wHandle,WM_COMMAND,MyDoSomethingSilly,0) Subclass your procedure and watch for your registered messages. Additional info can be passed with wParam and lParam. I usually make wHandle the first parameter in the procedure prototype and when an outside application (C++, VB, doesn't matter) wants to use my procedure, all they have to do is pass me their window handle. The first thing I do after that is send them a message containing MY window handle. After that, the lines of communication are wide open. MUCH faster than DDE. Much more reliable. I have a Clarion Graphics module talking with a POS system written in C++ this way. Very sweet and simple. On 8 May 2004 10:35:22 -0400, "Charles Edmonds" wrote: >Hello Everyone, > >I am looking for advice on how best to send a message to an external >program. > >Normally I use NetTalk to communicate between programs (nothing is easier!), >but in this case I need my Clarion program to be able to send a message >"back" to the program that called it. > >In this case, the external program prepares a data file and RUNs the Clarion >program with some command line parameters. > >The Clarion program uses the contents of the data file, does some work and >deletes the file. > >I'd like to be able to notify the program that handed off the job that it is >complete. > >I know I could create a results file and have the calling program poll for >the file, but I'd prefer a more elegant solution. > >I've looked a bit at FindWindow and PostMessage in the API and this seems >like it might be a good approach, but at this stage of the game I decided to >ask for some opinions and ideas here. > >While my program will initially be used with other Clarion programs, it was >designed to be used by non-Clarion programs too. > >So I'd like to use something that will be fairly easy to implement and would >be easily accessed from other platforms too. > >Thanks for any and all ideas and suggestions! > >Charles

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