हम खरोंच से मेटास्टॉक के लिए डीएलएल लिखते हैं। भाग 1

 #ifndef MSX_Structures_h #define MSX_Structures_h /* Structures required for MetaStock External Function DLL interface */ #ifndef BOOL typedef int BOOL; #endif #ifndef TRUE #define TRUE 1 #endif #ifndef FALSE #define FALSE 0 #endif // -------------------------------------------------------------------------- // Return this DLL version constant // -------------------------------------------------------------------------- const int MSX_VERSION = 1; // -------------------------------------------------------------------------- // Maximum number of aguments // -------------------------------------------------------------------------- const int MSX_MAXARGS = 9; // -------------------------------------------------------------------------- // Maximum string size (does not include MSXString arguments passed in to // external functions). // -------------------------------------------------------------------------- const int MSX_MAXSTRING = 100; // -------------------------------------------------------------------------- // The following two BOOL return values are returned from MSX functions // -------------------------------------------------------------------------- const BOOL MSX_SUCCESS = FALSE; const BOOL MSX_ERROR = TRUE; // ---------------------------------------------------------------------------------------- // There are four potential argument types // ---------------------------------------------------------------------------------------- const int MSXDataArray = 0; const int MSXNumeric = 1; const int MSXString = 2; const int MSXCustom = 3; // ---------------------------------------------------------------------------------------- // The following structure is used by the exported function MSXInfo // ---------------------------------------------------------------------------------------- typedef struct { char szCopyright[MSX_MAXSTRING]; int iNFuncs; int iVersion; } MSXDLLDef; // ---------------------------------------------------------------------------------------- // The following structure is used by the exported function MSXNthFunction // ---------------------------------------------------------------------------------------- typedef struct { char szFunctionName[MSX_MAXSTRING]; char szFunctionDescription[MSX_MAXSTRING]; int iNArguments; } MSXFuncDef; // ---------------------------------------------------------------------------------------- // The following structure is used by the exported function MSXNthArg // ---------------------------------------------------------------------------------------- typedef struct { int iArgType; // argtype constants: // 0 DataArray // 1 Numeric // 2 String // 3 CustomType char szArgName[MSX_MAXSTRING]; int iNCustomStrings; } MSXFuncArgDef; // ---------------------------------------------------------------------------------------- // The following structure is used by the exported function MSXNthCustomString // ---------------------------------------------------------------------------------------- typedef struct { char szString[MSX_MAXSTRING]; int iID; } MSXFuncCustomString; // ---------------------------------------------------------------------------------------- // the following datastructures are passed into and out of the user-written external // calculation functions. // ---------------------------------------------------------------------------------------- typedef struct { long lDate; long lTime; } MSXDateTime; typedef struct { float *pfValue; int iFirstValid; int iLastValid; } MSXDataInfoRec; typedef struct { MSXDateTime *psDate; MSXDataInfoRec sOpen; MSXDataInfoRec sHigh; MSXDataInfoRec sLow; MSXDataInfoRec sClose; MSXDataInfoRec sVol; MSXDataInfoRec sOI; MSXDataInfoRec sInd; char *pszSecurityName; // Security Name char *pszSymbol; // Security Symbol char *pszSecurityPath; // Path where security is stored (may be in UNC format) char *pszOnlineSource; // Unused - reserved for future use... int iPeriod; // 'D'aily, 'W'eekly, 'M'onthly, 'Q'uarterly, 'I'ntraday int iInterval; // For period='I'ntraday only. 0=tick, other value = minutes compression. int iStartTime; // HHMM format. Undefined for non-intraday period. int iEndTime; // HHMM format. Undefined for non-intraday period. int iSymbolType; // Unused - reserved for future use } MSXDataRec; typedef struct { // possible for MSX_MAXARGS data arrays MSXDataInfoRec *psDataInfoRecs[MSX_MAXARGS]; // pointers to the data arrays int iNRecs; // number of arrays present (just a sanity check) } MSXDataInfoRecArgsArray; typedef struct { float fNumerics[MSX_MAXARGS]; // possible for MSX_MAXARGS numerics int iNRecs; // also a sanity check - func knows how many there should be. } MSXNumericArgsArray; typedef struct { char *pszStrings[MSX_MAXARGS]; // possible for MSX_MAXARGS strings int iNRecs; // ditto the above } MSXStringArgsArray; typedef struct { int iCustomIDs[MSX_MAXARGS]; // numeric ID associated with a custom arg int iNRecs; // ditto the above } MSXCustomArgsArray; typedef struct { MSXDataInfoRec *psResultArray; // Pointer to result array char szExtendedError[MSX_MAXSTRING]; // Extended Error string } MSXResultRec; #endif