I have been trying without success to read the XML token A:atc id, string and display it in a C gauge... Here is what I've tried so far. All I get for my trouble is an "N" showing up...: WCHAR n_number[15] = L"N200SR";//----------------------case PANEL_SERVICE_PRE_UPDATE:execute_calculator_code("(A:atc id, string)",&n_number,NULL,NULL);break;//----------------------FLOAT64 FSAPI atc_cb( PELEMENT_STRING pelement){swprintf(pelement->string, L"%s", n_number);return 0;}MAKE_STRING(String_atc,NULL,NULL,IMAGE_USE_ERASE | IMAGE_USE_TRANSPARENCY | BIT7,0,8,5,98,27,1000000,MODULE_VAR_NONE,MODULE_VAR_NONE,MODULE_VAR_NONE,RGB(85,79,79),RGB(0,0,0),RGB(0,0,0),GAUGE_FONT_DEFAULT,GAUGE_WEIGHT_DEFAULT,GAUGE_CHARSET,0,0,NULL,atc_cb)PELEMENT_HEADER ElementList2[] = {&String_atc.header,NULL};

Bill,This seems to work:PCSTRINGZ n_number;execute_calculator_code("(A:atc id, string)",NULL,NULL,&n_number);sprintf(pelement->string,"ATC %s", n_number );The execute_calculator_code function is pretty adament about having the string variable in the form of PCSTRINGZ. Fortunately, the sprintf function is OK with that.Doug

THANK YOU! :)It works a treat!Now I finally understand how this works:BOOL (FSAPI *execute_calculator_code) (PCSTRINGZ code, FLOAT64* fvalue, SINT32* ivalue, PCSTRINGZ* svalue);

 hİ n4gix

 I am using simconnect in C#. I get or set almost all standart KeyEvents and Simulation variables.  But the aircraft contains some variables that special developer panels.     (L:Master_AC, bool),  (L:ignition, bool) , (L:Swapu, bool)  etc.

I want to change their values in C#.

As much as I understand I should use C++ language and execute_calculator_code to change their values.

The problem that I don'y know C++ or XML. Please help me to solve this problem.

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Since LVARS are only accessable via either execute_calculator_code (C code only) or in an XML gauge... I don't see how you're going to solve it.  There is no C# support for LVARS.