1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
| #include "stdafx.h"
#include<stdio.h>
#define MAX_NUM (10)
#define DATA_FILE "numbers.bin"
static void List()
{
FILE* pIn = fopen(DATA_FILE,"rb");
int iFileSize = 0;
int iItemsCnt = 0;
int iValue = 0;
if (!pIn)
{
printf("File [%s] open error!\n",DATA_FILE);
return;
}
// Get File size
if (fseek(pIn,0,SEEK_END))
{
// Error !
printf("File [%s] seek error!\n",DATA_FILE);
fclose(pIn);
return;
}
iFileSize = ftell(pIn);
if (!iFileSize)
{
printf("File [%s] open error!\n",DATA_FILE);
return;
}
iItemsCnt = iFileSize / sizeof(int);
rewind(pIn);
for (int ii = 0; ii < iItemsCnt; ++ii)
{
if (fread(&iValue,sizeof(int),1,pIn) != 1)
{
printf("File [%s] read error!\n",DATA_FILE);
fclose(pIn);
return;
}
printf("Pos: %d, Value %d\n",ii + 1,iValue);
}
fclose(pIn);
}
static void Add()
{
while (true)
{
int iPos = 0;
int iValue = 0;
printf("Enter value position [0..9] or any other value to stop input: ");
scanf("%d",&iPos);
if ((iPos < 0) || (iPos >= MAX_NUM))
{
// Error !
printf("Invalid position [%d]\n",iPos);
return;
}
printf("Enter value: ");
scanf("%d",&iValue);
FILE* pOut = fopen(DATA_FILE,"r+b");
if (!pOut)
{
printf("File [%s] open error!\n",DATA_FILE);
return;
}
if (fseek(pOut,iPos * sizeof(int),SEEK_SET))
{
// Error !
printf("File [%s] seek error!\n",DATA_FILE);
fclose(pOut);
return;
}
if (fwrite(&iValue,sizeof(int),1,pOut) != 1)
{
// Error !
printf("File [%s] write error!\n",DATA_FILE);
fclose(pOut);
return;
}
fclose(pOut);
}
}
static void Find()
{
// Haven't yet implemented !
}
int main(int argc,char** argv)
{
// Be sure file exist before any operations with it.
FILE* pFile = fopen(DATA_FILE,"a");
if (!pFile)
{
// Error !
printf("File [%s] can;t be open for operation!\n",DATA_FILE);
fclose(pFile);
return 0;
}
fclose(pFile);
int iChoice;
while (true)
{
printf("\nDo your selection:\n1 - List, 2 - Add, 3 - Find, 0 - Exit\n");
scanf("%d",&iChoice);
switch (iChoice)
{
case 1:
{
List();
break;
}
case 2:
{
Add();
break;
}
case 3:
{
Find();
break;
}
case 0:
{
exit(0);
break;
}
default :
{
// Continue Loop
break;
}
}
}
return 0;
} |
(
Сообщение от Faust611
