bfilter.cpp

これは C++ で書かれたフィルターの使用例です。

#include <stdio.h>
#include <ctype.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[128];
} 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
retrieveRecord(BtrieveFile *btrieveFile, char *key)
{
   Btrieve::StatusCode status = Btrieve::STATUS_CODE_NO_ERROR;
   BtrieveBulkRetrieveAttributes btrieveBulkRetrieveAttributes;
   BtrieveBulkRetrieveResult btrieveBulkRetrieveResult;
   BtrieveFilter btrieveFilter;
   int i;
   int recordCount;
   record_t record;
 
   // If SetComparison() fails.
   if ((status = btrieveFilter.SetComparison(Btrieve::COMPARISON_EQUAL)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      printf("Error: BtrieveFilter::SetComparison():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
      goto leave;
   }
 
   // If SetComparisonConstant() fails.
   if ((status = btrieveFilter.SetComparisonConstant((char *)key, 1)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      printf("Error: BtrieveFilter::SetComparisonConstant():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
      goto leave;
   }
 
   // If SetConnector() fails.
   if ((status = btrieveFilter.SetConnector(Btrieve::CONNECTOR_AND)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      printf("Error: BtrieveFilter::SetConnector():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
      goto leave;
   }
 
   // If SetField() fails.
   if ((status = btrieveFilter.SetField(25, 1, Btrieve::DATA_TYPE_CHAR)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      printf("Error: BtrieveFilter::SetField():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
      goto leave;
   }
 
   // If AddFilter() fails.
   if ((status = btrieveBulkRetrieveAttributes.AddFilter(&btrieveFilter)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      printf("Error: BtrieveBulkRetrieveAttributes::AddFilter():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
      goto leave;
   }
 
   // If SetConnector() fails.
   if ((status = btrieveFilter.SetConnector(Btrieve::CONNECTOR_AND)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      printf("Error: BtrieveFilter::SetConnector():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
      goto leave;
   }
 
   // If SetField() fails.
   if ((status = btrieveFilter.SetField(32, 1, Btrieve::DATA_TYPE_CHAR)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      printf("Error: BtrieveFilter::SetField():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
      goto leave;
   }
 
   // If SetComparisonField() fails.
   if ((status = btrieveFilter.SetComparisonField(27)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      printf("Error: BtrieveFilter::SetComparisonField():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
      goto leave;
   }
 
   // If AddFilter() fails.
   if ((status = btrieveBulkRetrieveAttributes.AddFilter(&btrieveFilter)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      printf("Error: BtrieveBulkRetrieveAttributes::AddFilter():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
      goto leave;
   }
 
   // If SetCaseSensitivity() fails.
   if ((status = btrieveFilter.SetACSMode(Btrieve::ACS_MODE_CASE_INSENSITIVE)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      printf("Error: BtrieveFilter::SetACSMode():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
      goto leave;
   }
 
   // If SetComparison() fails.
   if ((status = btrieveFilter.SetComparison(Btrieve::COMPARISON_EQUAL)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      printf("Error: BtrieveFilter::SetComparison():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
      goto leave;
   }
 
   // If SetConnector() fails.
   if ((status = btrieveFilter.SetConnector(Btrieve::CONNECTOR_AND)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      printf("Error: BtrieveFilter::SetConnector():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
      goto leave;
   }
 
   // If SetField() fails.
   if ((status = btrieveFilter.SetField(20, 1, Btrieve::DATA_TYPE_CHAR)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      printf("Error: BtrieveFilter::SetField():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
      goto leave;
   }
 
   // If SetComparisonConstant() fails.
   if ((status = btrieveFilter.SetComparisonConstant("E", 1)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      printf("Error: BtrieveFilter::SetComparisonConstant():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
      goto leave;
   }
 
   // If AddFilter() fails.
   if ((status = btrieveBulkRetrieveAttributes.AddFilter(&btrieveFilter)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      printf("Error: BtrieveBulkRetrieveAttributes::AddFilter():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
      goto leave;
   }
 
   // If SetACSName() fails.
   if ((status = btrieveFilter.SetACSName("u54-msft_enus_0")) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      printf("Error: BtrieveFilter::SetACSName():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
      goto leave;
   }
 
   // If SetComparison() fails.
   if ((status = btrieveFilter.SetComparison(Btrieve::COMPARISON_GREATER_THAN_OR_EQUAL)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      printf("Error: BtrieveFilter::SetComparison():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
      goto leave;
   }
 
   // If SetConnector() fails.
   if ((status = btrieveFilter.SetConnector(Btrieve::CONNECTOR_LAST)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      printf("Error: BtrieveFilter::SetConnector():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
      goto leave;
   }
 
   // If SetField() fails.
   if ((status = btrieveFilter.SetField(19, 1, Btrieve::DATA_TYPE_CHAR)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      printf("Error: BtrieveFilter::SetField():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
      goto leave;
   }
 
   // If SetComparisonConstant() fails.
   if ((status = btrieveFilter.SetComparisonConstant("R", 1)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      printf("Error: BtrieveFilter::SetComparisonConstant():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
      goto leave;
   }
 
   // If AddFilter() fails.
   if ((status = btrieveBulkRetrieveAttributes.AddFilter(&btrieveFilter)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      printf("Error: BtrieveBulkRetrieveAttributes::AddFilter():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
      goto leave;
   }
 
   // If AddField() fails.
   if ((status = btrieveBulkRetrieveAttributes.AddField(0, sizeof(record))) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      printf("Error: BtrieveBulkRetrieveAttributes::AddField():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
      goto leave;
   }
 
   // If SetMaximumRecordCount() fails.
   if ((status = btrieveBulkRetrieveAttributes.SetMaximumRecordCount(MAX_X - MIN_X + 1)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      printf("Error: BtrieveBulkRetrieveAttributes::SetMaximumRecordCount():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
      goto leave;
   }
 
   // If SetMaximumRejectCount() fails.
   if ((status = btrieveBulkRetrieveAttributes.SetMaximumRejectCount(MAX_X - MIN_X + 2)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      printf("Error: BtrieveBulkRetrieveAttributes::SetMaximumRejectCount():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
      goto leave;
   }
 
   // If SetSkipCurrentRecord() fails.
   if ((status = btrieveBulkRetrieveAttributes.SetSkipCurrentRecord(false)) != Btrieve::STATUS_CODE_NO_ERROR)
   {
      printf("Error: BtrieveBulkRetrieveAttributes::SetSkipCurrentRecord():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
      goto leave;
   }
 
   // If RecordRetrieveFirst() fails.
   if (btrieveFile->RecordRetrieveFirst(Btrieve::INDEX_NONE, (char *)&record, sizeof(record)) != sizeof(record))
   {
      status = btrieveFile->GetLastStatusCode();
      printf("Error: BtrieveFile::RecordRetrieveFirst():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
      goto leave;
   }
 
   // If BulkRetrieveNext() fails.
   if ((status = btrieveFile->BulkRetrieveNext(&btrieveBulkRetrieveAttributes, &btrieveBulkRetrieveResult)) != Btrieve::STATUS_CODE_END_OF_FILE)
   {
      printf("Error: BtrieveFile::BulkRetrieveNext():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
      goto leave;
   }
        else
        {
                status = Btrieve::STATUS_CODE_NO_ERROR;
        }
 
   // If GetRecordCount() fails.
   if ((recordCount = btrieveBulkRetrieveResult.GetRecordCount()) == -1)
   {
      status = btrieveBulkRetrieveResult.GetLastStatusCode();
      printf("Error: BtrieveBulkRetrieveResult::GetRecordCount():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
      goto leave;
   }
 
   for (i = 1; i <= recordCount; i++)
   {
      // If GetRecord() fails.
      if (btrieveBulkRetrieveResult.GetRecord(i, (char *)&record, sizeof(record)) != sizeof(record))
      {
         status = btrieveBulkRetrieveResult.GetLastStatusCode();
         printf("Error: BtrieveBulkRetrieveResult::GetRecord():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
         goto leave;
      }
 
      // If GetRecordCursorPosition() fails.
      if (btrieveBulkRetrieveResult.GetRecordCursorPosition(i) < 0)
      {
         status = btrieveBulkRetrieveResult.GetLastStatusCode();
         printf("Error: BtrieveBulkRetrieveResult::GetRecordCursorPosition():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
         goto leave;
      }
 
      // If GetRecordLength() fails.
      if (btrieveBulkRetrieveResult.GetRecordLength(i) != sizeof(record))
      {
         status = btrieveBulkRetrieveResult.GetLastStatusCode();
         printf("Error: BtrieveBulkRetrieveResult::GetRecordLength():%d:%s.\n", status, Btrieve::StatusCodeToString(status));
         goto leave;
      }
 
      printf("record: (%u, %u, %g, %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);
 
      if ((i % 2) == 0)
      {
         snprintf(record.text, sizeof(record.text), "The square of %03d is %05d and its square root is %f.", record.x, record.xSquared, record.xSquareRoot);
      }
      else
      {
         snprintf(record.text, sizeof(record.text), "The SQUARE of %03d is %05d 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 SetField() fails.
   if ((status = btrieveKeySegment.SetField(11, 128, Btrieve::DATA_TYPE_ZSTRING)) != 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 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 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 <digit>\n";
 
   BtrieveClient btrieveClient;
   Btrieve::StatusCode status = Btrieve::STATUS_CODE_UNKNOWN;
   BtrieveFile btrieveFile;
   char key;
 
   // If the incorrect number of arguments were given.
   if (argc != 2)
   {
      printf(usage, argv[0]);
      goto leave;
   }
 
   // If digit is out of range.
   if ((isdigit(argv[1][0]) == 0) || (argv[1][1] != '\0'))
   {
      printf(usage, argv[0]);
      goto leave;
   }
 
   key = (char)argv[1][0];
 
   // 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 = 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;
}