🚀 go-pugleaf

"Nate Lockwood" <RNLockwoodREMOVE@attglobal.net> wrote in message
news:4400e10b$1@newsgroups.borland.com...

> I send a message to a already running application from one that
> has just been started.  This works just fine AFAIK except when
> I try to get to the LParam.  Eventually I expect to retrieve a char
> string.

Your code is completely wrong for that.  You cannot use COPYDATASTRUCT with
any message other than the WM_COPYDATA message.  And you cannot use the
TApplication::OnMessage event to catch WM_COPYDATA messages, because the
OnMessage event is only triggered for messages that are posted to the
message queue, which WM_COPYDATA never is.

> I get this error:
>
> [C++ Error] Main.cpp(171): E2316 'WParam' is not a member of 'tagMSG'

WParam (capital letters) is a VCL naming convension.  tagMSG is a Win32 API
structure, not a VCL structure.  If you look at the definition of MSG in the
Win32 API, you will see the following:

    typedef struct tagMSG {
        HWND   hwnd;
        UINT   message;
        WPARAM wParam;
        LPARAM lParam;
        DWORD  time;
        POINT  pt;
    } MSG;


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