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direct input invalid access code

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Hello everyone, I have a problem getting the input from the keyboard during the debug it always fails to do it. It gives me a message Invalid Access code... I don't know what that means. this is the code. void WINAPI ProcessKBInput() { if (KeyInit==true) { hr = g_lpDIDevice->GetDeviceState(sizeof(buffer),(LPVOID)&buffer); if FAILED(hr) { // If it failed, the device has probably been lost. // Check for (hr == DIERR_INPUTLOST) // and attempt to reacquire it here. return; } and it is called here: // Enter the message loop MSG msg; while( GetMessage( &msg, NULL, 0, 0 ) ) { ProcessKBInput(); TranslateMessage( &msg ); DispatchMessage( &msg ); } I'm not sure if here is where you are suppose to call it, please correct my mistakes... thank you.

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