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long gbp = ChartOpen ( "GBPUSD" , PERIOD_M5 ); ChartSetInteger (gbp, CHART_MODE , CHART_CANDLES ); Why second line doesn't work on strategy tester and so when I use _Symbol when chart  GBPUSD is opened Its don't give me a "GBPUSD"? How to fix

int file_handleb= FileOpen ( "buy" , FILE_READ | FILE_WRITE | FILE_BIN | FILE_COMMON ); FileWriteInteger (file_handleb, 1 , INT_VALUE ); int a = FileReadInteger (file_handleb, INT_VALUE ); Comment (a); Why the output of FileReadInteger is zero? How

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void OnChartEvent When I used strategy tester void OnChartEvent isn't work. How to fix this. So I try to create buttons on strategy tester but they doesn't shows.