bindexattributes.cpp

これは C++ で書かれたインデックス属性の使用例です。

#include <stdio.h>
#include <math.h>
#include <stdlib.h>
#include <stdint.h>
 
#include "btrieveCpp.h"
 
 
static char *btrieveFileName = (char *)"squaresAndSquareRoots.btr";
 
#ifndef __GNUC__
   #define snprintf _snprintf
#endif
 
#define MIN_X 0
#define MAX_X 255
 
#pragma pack(1)
typedef struct {
        uint8_t x;
        uint16_t xSquared;
        double xSquareRoot;
   char text[1024];
} record_t;
#pragma pack()
 
static Btrieve::StatusCode
createFile(BtrieveClient *btrieveClient)
{
   Btrieve::StatusCode status;
   BtrieveFileAttributes btrieveFileAttributes;
 
   // If SetFixedRecordLength() fails.
   if ((status = btrieveFileAttributes.SetFixedRecordLength(sizeof(record_t))) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      printf("Error: BtrieveFileAttributes::SetFixedRecordLength():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
      goto leave;
   }
 
   // If FileCreate() fails.
   if ((status = btrieveClient->FileCreate(&btrieveFileAttributes, btrieveFileName, Btrieve::CREATE_MODE_OVERWRITE)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      printf("Error: BtrieveClient::FileCreate():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
      goto leave;
   }
 
leave:
   return status;
}
 
static Btrieve::StatusCode
openFile(BtrieveClient *btrieveClient, BtrieveFile *btrieveFile)
{
   Btrieve::StatusCode status;
 
   // If FileOpen() fails.
   if ((status = btrieveClient->FileOpen(btrieveFile, btrieveFileName, NULL, Btrieve::OPEN_MODE_NORMAL)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      printf("Error: BtrieveClient::FileOpen():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
      goto leave;
   }
 
leave:
   return status;
}
 
static Btrieve::StatusCode
retrieveRecords(BtrieveFile *btrieveFile)
{
   Btrieve::StatusCode status = Btrieve::STATUS_CODE_NO_ERROR;
   record_t record;
   int i;
 
   for (i = MIN_X; i <= MAX_X; i++)
   {
      if (i == MIN_X)
      {
         // If RecordRetrieveFirst() fails.
         if (btrieveFile->RecordRetrieveFirst(Btrieve::INDEX_119, (char *)&record, sizeof(record)) != sizeof(record))
         {
            status = btrieveFile->GetLastStatusCode();
            printf("Error: BtrieveFile::RecordRetrieveFirst():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
            goto leave;
         }
      }
      else
      {
         // If RecordRetrieveNext() fails.
         if (btrieveFile->RecordRetrieveNext((char *)&record, sizeof(record)) != sizeof(record))
         {
            status = btrieveFile->GetLastStatusCode();
            printf("Error: BtrieveFile::RecordRetrieveNext():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
            goto leave;
         }
      }
 
      printf("record: (%u, %u, %f, %s)\n", record.x, record.xSquared, record.xSquareRoot, record.text);
   }
 
leave:
   return status;
}
 
static Btrieve::StatusCode
loadFile(BtrieveFile *btrieveFile)
{
   Btrieve::StatusCode status = Btrieve::STATUS_CODE_NO_ERROR;
   int i;
   record_t record;
 
   for (i = MIN_X; i <= MAX_X; i++)
   {
      record.x = (uint8_t)i;
      record.xSquared = (uint16_t)(i * i);
      record.xSquareRoot = sqrt((double)i);
      snprintf(record.text, sizeof(record.text), "The square of %d is %d and its square root is %f.", record.x, record.xSquared, record.xSquareRoot);
      record.text[sizeof(record.text) - 1] = '\0';
 
      // If RecordCreate() fails.
      if ((status = btrieveFile->RecordCreate((char *)&record, sizeof(record))) != Btrieve::STATUS_CODE_NO_ERROR)
      {
         printf("Error: BtrieveFile::RecordCreate():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
         goto leave;
      }
   }
 
leave:
   return status;
}
 
static Btrieve::StatusCode
closeFile(BtrieveClient *btrieveClient, BtrieveFile *btrieveFile)
{
   Btrieve::StatusCode status;
 
   // If FileClose() fails.
   if ((status = btrieveClient->FileClose(btrieveFile)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      printf("Error: BtrieveClient::FileClose():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
      goto leave;
   }
 
leave:
   return status;
}
 
static Btrieve::StatusCode
deleteFile(BtrieveClient *btrieveClient)
{
   Btrieve::StatusCode status;
 
   // If FileDelete() fails.
   if ((status = btrieveClient->FileDelete(btrieveFileName)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      printf("Error: BtrieveClient::FileDelete():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
      goto leave;
   }
 
leave:
   return status;
}
 
static Btrieve::StatusCode
createIndex(BtrieveFile *btrieveFile)
{
   Btrieve::StatusCode status;
   BtrieveIndexAttributes btrieveIndexAttributes;
   BtrieveKeySegment btrieveKeySegment;
 
   // If SetDescendingSortOrder() fails.
   if ((status = btrieveKeySegment.SetDescendingSortOrder(true)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      printf("Error: BtrieveKeySegment::SetDescendingSortOrder():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
      goto leave;
   }
 
   // If SetField() fails.
   if ((status = btrieveKeySegment.SetField(11, Btrieve::MAXIMUM_KEY_LENGTH, Btrieve::DATA_TYPE_ZSTRING)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      printf("Error: BtrieveKeySegment::SetField():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
      goto leave;
   }
 
   // If SetNullKeyMode() fails.
   if ((status = btrieveKeySegment.SetNullKeyMode(Btrieve::NULL_KEY_MODE_ANY_SEGMENTS)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      printf("Error: BtrieveKeySegment::SetNullKeyMode():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
      goto leave;
   }
 
   // If SetNullValue() fails.
   if ((status = btrieveKeySegment.SetNullValue(255)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      printf("Error: BtrieveKeySegment::SetNullValue():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
      goto leave;
   }
 
   // If AddKeySegment() fails.
   if ((status = btrieveIndexAttributes.AddKeySegment(&btrieveKeySegment)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      printf("Error: BtrieveIndexAttributes::AddKeySegment():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
      goto leave;
   }
 
   // If SetACSName() fails.
   if ((status = btrieveIndexAttributes.SetACSName("u54-msft_enus_0")) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      printf("Error: BtrieveIndexAttributes::SetACSName():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
      goto leave;
   }
 
   // If SetDuplicateMode() fails.
   if ((status = btrieveIndexAttributes.SetDuplicateMode(Btrieve::DUPLICATE_MODE_ALLOWED_NONREPEATING)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      printf("Error: BtrieveIndexAttributes::SetDuplicateMode():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
      goto leave;
   }
 
   // If SetIndex() fails.
   if ((status = btrieveIndexAttributes.SetIndex(Btrieve::INDEX_119)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      printf("Error: BtrieveIndexAttributes::SetIndex():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
      goto leave;
   }
 
   // If SetModifiable() fails.
   if ((status = btrieveIndexAttributes.SetModifiable(false)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      printf("Error: BtrieveIndexAttributes::SetModifiable():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
      goto leave;
   }
 
   // If IndexCreate() fails.
   if ((status = btrieveFile->IndexCreate(&btrieveIndexAttributes)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      printf("Error: BtrieveFile::IndexCreate():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
      goto leave;
   }
 
leave:
   return status;
}
 
int
main(int argc, char *argv[])
{
   static const char *usage = "Usage: %s\n";
 
   BtrieveClient btrieveClient;
   Btrieve::StatusCode status = Btrieve::STATUS_CODE_UNKNOWN;
   BtrieveFile btrieveFile;
 
   // If the incorrect number of arguments were given.
   if (argc != 1)
   {
      printf(usage, argv[0]);
      goto leave;
   }
 
   // If createFile() fails.
   if ((status = createFile(&btrieveClient)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      goto leave;
   }
 
   // If openFile() fails.
   if ((status = openFile(&btrieveClient, &btrieveFile)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      goto leave;
   }
 
   // If createIndex() fails.
   if ((status = createIndex(&btrieveFile)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      goto leave;
   }
 
   // If loadFile() fails.
   if ((status = loadFile(&btrieveFile)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      goto leave;
   }
 
   // If retrieveRecord() fails.
   if ((status = retrieveRecords(&btrieveFile)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      goto leave;
   }
 
   // If closeFile() fails.
   if ((status = closeFile(&btrieveClient, &btrieveFile)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      goto leave;
   }
 
   // If deleteFile() fails.
   if ((status = deleteFile(&btrieveClient)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      goto leave;
   }
 
leave:
   // If there wasn't a failure.
   if (status == Btrieve::STATUS_CODE_NO_ERROR)
      return 0;
 
   return 1;
}