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  1. Background PMDG Aircraft for FSX and P3D do not typically use the normal controls provided by the flight sim. This means that many of the aircraft's switches cannot be assigned to buttons and keys using the list of controls in the FSUIPC dropdown boxes. Assigning a standard control in FSUIPC will likely do nothing in the PMDG aircraft when the button or key is pressed. Solution Instead of using the standard list of controls shown in the FSUIPC dropdown box, users must use a different set of controls provided by PMDG for the specific aircraft. These are known as custom controls (or custom events). The custom controls vary for each aircraft and are listed in the SDK that is installed alongside the aircraft. This guide will show you, step-by-step: How to find the SDK files How to calculate the custom control numbers How to work out the parameter value How to assign the control to buttons/keys in FSUIPC The specific examples shown will be taken from the PMDG 737NGX, but the same method works for any PMDG aircraft with an SDK and custom controls (e.g. 777, 747). 1. Locating the SDK From your main Flight Sim install folder, open the PMDG folder. Then select the folder belonging to the aircraft you want to use. e.g. PMDG 737 NGX Then select the SDK folder Locate the file with the .h extension. For the 737 it's called PMDG_NGX_SDK.h You can open this file with Notepad or your favourite text editor. As an example, the document you need for the 737 will be: [FlightSimInstallFolder]\PMDG\PMDG 737 NGX\SDK\PMDG_NGX_SDK.h 2. Calculating the control numbers 2.1. Find THIRD_PARTY_EVENT_ID_MIN The first thing to find is the definition of THIRD_PARTY_EVENT_ID_MIN. Search for the following text: #define THIRD_PARTY_EVENT_ID_MIN You will find a line like this (from the 737 file): #define THIRD_PARTY_EVENT_ID_MIN 0x00011000 // equals to 69632 Note the decimal value at the end. In the case above it's 69632. You will need this value to calculate the control number in the next step. 2.2. Find the control you want to use. Search for the control by name, or look through the listed controls to find the one you want. They are helpfully grouped together by panel. The controls are listed under a comment: // Control Events You can search for this to find where the list of control numbers starts. As an example we'll use the Autopilot CMD A swtich on the MCP. This is the relevant line in the 737 SDK: #define EVT_MCP_CMD_A_SWITCH (THIRD_PARTY_EVENT_ID_MIN + 402) To calculate the control number for this switch we just add 402 to the value of THIRD_PARTY_EVENT_ID_MIN we found earlier. 69632 + 402 = 70034 We have now calculated the control number. We will use this in step 4 to program the button/key. 3. Finding the parameter value PMDG controls need a parameter value which represents what type of mouse click to simulate for the particular switch. Mainly it will be the left mouse button, but other clicks types are available (e.g. Right button, left double click etc). To find the codes for each type of click, search for MOUSE_FLAG You'll find a block of #define statements for each type of mouse click. Here are a couple of examples from the 737 sdk: #define MOUSE_FLAG_RIGHTSINGLE 0x80000000 #define MOUSE_FLAG_LEFTSINGLE 0x20000000 Find the click that you want to simulate and get the code. For example, we'll have our key assignment simulate the left mouse button clicking on the CMD A autopilot button. So we'll need 0x20000000 as the parameter value for the control. Now we have the control number and parameter value. 4. Assigning the control to a button or key in FSUIPC Select the [buttons + swtiches] or [key presses] tab in FSUIPC and select the button or key to program. From the "control sent..." dropdown select <custom control> (it's near the top of the list) A popup window appears asking for the control number. Type in the control number you calculated in step 2. For our 'autopilot CMD A' example, we enter 70034 and click OK. The controls dropdown box will now show the control number in angled brackets. In the "parameter" box (below the controls dropdown), enter the mouse code from step 3. Do not include the first 0 from the number listed in the PMDG SDK. Start with the x. With our example, we would enter x20000000 for the left-button single-click. Note that this code is in hexadecimal. FSUIPC will convert it to the equivalent decimal value. This is nothing to worry about. It's the same number. Entering the value in Hex is more convenient. If you're programming a key press, remember to press the [confirm] button. Here is our example control assigned to a button in FSUIPC: Your button or key press should now operate the switch in your PMDG aircraft.
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