bkeyonly.cpp

これは C++ で書かれたキー オンリー ファイルの使用例です。

#include <stdio.h>
#include <math.h>
#include <stdlib.h>
#include <stdint.h>
 
#include "btrieveCpp.h"
 
static char *btrieveFileName = (char *)"primes.btr";
 
#define MIN_X 1
#define MAX_X 255
 
static Btrieve::StatusCode
createFile(BtrieveClient *btrieveClient)
{
   Btrieve::StatusCode status;
   BtrieveFileAttributes btrieveFileAttributes;
   BtrieveIndexAttributes btrieveIndexAttributes;
   BtrieveKeySegment btrieveKeySegment;
 
   // If SetField() fails.
   if ((status = btrieveKeySegment.SetField(0, sizeof(uint32_t), Btrieve::DATA_TYPE_UNSIGNED_BINARY)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      printf("Error: BtrieveKeySegment::SetField():%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 SetKeyOnly() fails.
   if ((status = btrieveFileAttributes.SetKeyOnly(true)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      printf("Error: BtrieveFileAttributes::SetKeyOnly():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
      goto leave;
   }
 
   // If SetFixedRecordLength() fails.
   if ((status = btrieveFileAttributes.SetFixedRecordLength(sizeof(uint32_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, &btrieveIndexAttributes, 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
loadFile(BtrieveFile *btrieveFile)
{
   Btrieve::StatusCode status = Btrieve::STATUS_CODE_NO_ERROR;
   uint32_t key;
   int i;
   int j;
   uint32_t record;
 
   for (i = MIN_X; i <= MAX_X; i++)
   {
      record = (uint32_t)i;
 
      // 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;
      }
   }
 
   for (j = 2; j <= (MAX_X / 2); j++)
   {
      for (i = j * 2; i <= MAX_X; i += j)
      {
         key = (uint32_t)i;
 
         // If RecordRetrieve() fails.
         if (btrieveFile->RecordRetrieve(Btrieve::COMPARISON_EQUAL, Btrieve::INDEX_1, (char *)&key, sizeof(key), (char *)&record, sizeof(record)) != sizeof(record))
         {
            continue;
         }
 
         // If RecordDelete() fails.
         if ((status = btrieveFile->RecordDelete()) != Btrieve::STATUS_CODE_NO_ERROR)
         {
            printf("Error: BtrieveFile::RecordDelete():%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
retrieveRecord(BtrieveFile *btrieveFile, uint32_t *key)
{
   Btrieve::StatusCode status;
 
   // If KeyRetrieve() fails.
   if ((status = btrieveFile->KeyRetrieve(Btrieve::COMPARISON_EQUAL, Btrieve::INDEX_1, (char *)key, sizeof(*key))) == Btrieve::STATUS_CODE_NO_ERROR)
   {
      printf("%u is prime.\n", *key);
      goto leave;
   }
 
   if (status == Btrieve::STATUS_CODE_KEY_VALUE_NOT_FOUND)
   {
      printf("%u is not prime.\n", *key);
      status = Btrieve::STATUS_CODE_NO_ERROR;
      goto leave;
   }
 
   printf("Error: BtrieveClient::KeyRetrieve():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
 
leave:
   return status;
}
 
int
main(int argc, char *argv[])
{
   static const char *usage = "Usage: %s <uint8_value greater than zero>\n";
 
   BtrieveClient btrieveClient;
   Btrieve::StatusCode status = Btrieve::STATUS_CODE_UNKNOWN;
   BtrieveFile btrieveFile;
   uint32_t key;
   uint64_t integerValue;
 
   // If the incorrect number of arguments were given.
   if (argc != 2)
   {
      printf(usage, argv[0]);
      goto leave;
   }
 
   integerValue = atoi(argv[1]);
 
   // If integerValue is out of range.
   if ((integerValue < MIN_X) || (integerValue > MAX_X))
   {
      printf(usage, argv[0]);
      goto leave;
   }
 
   key = (uint32_t)integerValue;
 
   // 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 loadFile() fails.
   if ((status = loadFile(&btrieveFile)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      goto leave;
   }
 
   // If retrieveRecord() fails.
   if ((status = retrieveRecord(&btrieveFile, &key)) != 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;
}