Mostafa

Thank you for your support. This is the code that worked for me: #include <iostream> #include <windows.h> #include "FSUIPC_User64.h" #include <iomanip> using namespace std; int main() { DWORD dwResult; if (FSUIPC_Open(SIM_ANY, &dwResult)) { std::cout << "Connected to FSUIPC" << std::endl; double newLvarValue = 1.0; // The value you want to set // Step 1: Write the new LVAR value to user offset 0x66C0 if (!FSUIPC_Write(0x66C0, sizeof(newLvarValue), &newLvarValue, &dwResult)) { std::cout << "Failed to write new LVAR value to offset 0x66C0" << std::endl; } // Step 2: Write the offset address (0x66C0) and format specifier (0 for double) to 0x0D6C DWORD param = 0x066C0; // 0x66C0 offset + format specifier (0 = double) if (!FSUIPC_Write(0x0D6C, sizeof(param), &param, &dwResult)) { std::cout << "Failed to write parameter to offset 0x0D6C" << std::endl; } // Step 3: Write the LVAR command "::ASD_SWITCH_EXT_POWER" to 0x0D70 const char lvarCommand[] = "::ASD_SWITCH_EXT_POWER"; if (!FSUIPC_Write(0x0D70, sizeof(lvarCommand), (void*)lvarCommand, &dwResult)) { std::cout << "Failed to write LVAR command to offset 0x0D70" << std::endl; } // Step 4: Process the writes if (!FSUIPC_Process(&dwResult)) { std::cout << "FSUIPC process failed" << std::endl; } else { std::cout << "LVAR write command sent successfully" << std::endl; } FSUIPC_Close(); } else { std::cout << "Failed to connect to FSUIPC" << std::endl; } } Could you help me read an LVAR? @John Dowson

Using this code as your instructions just added a FSUIPC_Read function before Close: #include <iostream> #include <windows.h> #include "FSUIPC_User64.h" #include <iomanip> using namespace std; int main() { DWORD dwResult; if (FSUIPC_Open(SIM_ANY, &dwResult)) { std::cout << "Connected to FSUIPC" << std::endl; double newLvarValue = 1.0; // The value you want to set // Step 1: Write the new LVAR value to user offset 0x66C0 if (!FSUIPC_Write(0x66C0, sizeof(newLvarValue), &newLvarValue, &dwResult)) { std::cout << "Failed to write new LVAR value to offset 0x66C0" << std::endl; } // Step 2: Write the offset address (0x66C0) and format specifier (0 for double) to 0x0D6C DWORD param = 0x66C00000; // 0x66C0 offset + format specifier (0 = double) if (!FSUIPC_Write(0x0D6C, sizeof(param), &param, &dwResult)) { std::cout << "Failed to write parameter to offset 0x0D6C" << std::endl; } // Step 3: Write the LVAR command "::ASD_SWITCH_EXT_POWER" to 0x0D70 const char lvarCommand[] = "::ASD_SWITCH_EXT_POWER"; if (!FSUIPC_Write(0x0D70, sizeof(lvarCommand), (void*)lvarCommand, &dwResult)) { std::cout << "Failed to write LVAR command to offset 0x0D70" << std::endl; } // Step 4: Process the writes if (!FSUIPC_Process(&dwResult)) { std::cout << "FSUIPC process failed" << std::endl; } else { std::cout << "LVAR write command sent successfully" << std::endl; } // Step 5: Read back the value from 0x66C0 to confirm the change double readBackValue = 0.0; if (FSUIPC_Read(0x66C0, sizeof(readBackValue), &readBackValue, &dwResult)) { FSUIPC_Process(&dwResult); std::cout << "LVAR ASD_SWITCH_EXT_POWER updated to: " << readBackValue << std::endl; } else { std::cout << "Failed to read back LVAR value" << std::endl; } FSUIPC_Close(); } else { std::cout << "Failed to connect to FSUIPC" << std::endl; } } This results in : Connected to FSUIPC LVAR write command sent successfully LVAR ASD_SWITCH_EXT_POWER updated to: 1 But the switch in the simulator doesn't change, I am sure that the switch named ASD_SWITCH_EXT_POWER as I use SPAD.next to get LVARs. Is there is something I am missing ? Thanks In Advance. @John Dowson

I am trying to change a switch which has LVAR: ASD_SWITCH_EXT_POWER using C++ code, so I am using UIPC_SDK_C_version2. Could anyone give me a snippet of code on how to read the value of the switch and how to change its value to 1. Also trying to build any code using FSUIPC_User64.h results in build error ( The library was created by a different version of the compiler ) is there is something I am missing? Thanks In Advance.

Using UIPC_SDK_C_version2. Is there is documentation on the library or how to use the functions? Also, Could you give just a snippet of a code that update an LVAR named : ASD_SWITCH_EXT_POWER to 1 then Read its current value? Thanks In Advance. @John Dowson

Could anyone guide me on how to change the value of LVARs in Prepar3d using C++ code? I can't find FSUIPC_User.h or .cpp files. Thanks in advance.