callExternalFunction

Provides a method for a macros script to call out to native code. Typically, used for bringing up a custom graphical user interface developed in a technology other than Flash.

When the script calls callExternalFunction, the specified DLL filename is loaded from the folder containing the currently executing script file. The DLL extension is added automatically to the specified filename. The DLL filename cannot include path elements and must include a filename without an extension such as myMacroExtension.

GetProcAddress is used to find the function identified by the sFunctionName parameter.

Sample call:

designer.callExternalFunction("DesignerExtension", "ShowMyDialog", "user data here");

This call loads a DLL called DesignerExtension.dll from the same directory in which the macro is installed, looks up a function called ShowMyDialog, and passes the "user data here" string as a wide character string (const wchar_t *).

The function can return a string, which is returned from the designer.callExternalFunction call. The string is returned as an HGLOBAL containing a wide character string.

The following example of a function in a DLL, shows the passed-in string in a dialog, and returns "yes" or "no" based on which option the user clicks. The C function must have the function prototype like this example.

extern "C" __declspec(dllexport) HGLOBAL _cdecl ShowMyDialog(HWND hwndParent, const wchar_t *pszArgument) 
{ 
    int nResult = ::MessageBox(hwndParent, pszArgument, L"DLL Function Sample", MB_YESNO); 
// Allocate some memory for the result string 
    HGLOBAL hMem = GlobalAlloc(0, 64); 
    if (!hMem) 
        return 0; 
wchar_t *pMem = (wchar_t *)GlobalLock(hMem); 
    wcscpy_s(pMem, 30, nResult == IDYES ? L"yes" : L"no"); 
    ::GlobalUnlock(hMem); 
    return hMem; 
}

designer.callExternalFunction ( STRING param1, STRING param2, STRING param3)

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