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
|
/**********************************************************************
* ex_writecb.c
*
* This example program illustrates the use of the E00WriteCallbackOpen()
* and associated compressed E00 write functions.
**********************************************************************/
#include <stdio.h>
#include "e00compr.h"
static int myWriteNextLine(void *pRefData, const char *pszLine);
int main(int argc, char *argv[])
{
E00ReadPtr hReadPtr;
E00WritePtr hWritePtr = NULL;
const char *pszLine;
FILE *fp;
int nStatus = 0;
/* Open input file */
hReadPtr = E00ReadOpen("test1.e00");
if (hReadPtr)
{
/* Open output file, and if succesful then initialize the writer
* using the myWriteNextLine callback method.
* For the purposes of this example, fp will be used directly
* as reference data for the callback.
*/
if ((fp = fopen("test2.e00", "wt")) != NULL)
{
hWritePtr = E00WriteCallbackOpen((void *)fp,
myWriteNextLine,
E00_COMPR_FULL);
}
if (hWritePtr)
{
/* Read lines from input until we reach EOF */
while((pszLine = E00ReadNextLine(hReadPtr)) != NULL)
{
if ((nStatus = CPLGetLastErrorNo()) == 0)
nStatus = E00WriteNextLine(hWritePtr, pszLine);
if (nStatus != 0)
{
/* An error happened while converting the last
* line... abort*/
break;
}
}
/* Close output file. */
E00WriteClose(hWritePtr);
}
else
{
/* ERROR ... failed to open output file */
nStatus = CPLGetLastErrorNo();
}
/* Close the physical output file */
if (fp)
fclose(fp);
/* Close input file. */
E00ReadClose(hReadPtr);
}
else
{
/* ERROR ... failed to open input file */
nStatus = CPLGetLastErrorNo();
}
return nStatus;
}
/**********************************************************************
* myWriteNextLine()
*
* My own implementation of the ReadWriteNextLine() function to test the
* E00WriteCallbackOpen() functions.
*
* This function writes a line to the E00 file. The line that is passed
* as argument won't be terminated by a '\n', it is the responsibility
* of this function to add one if needed.
*
* myWriteNextLine() should return a positive value on success (the number
* of chars written, as printf() does) or -1 if an error happened...
**********************************************************************/
static int myWriteNextLine(void *pRefData, const char *pszLine)
{
int nStatus;
/* For the purpose of this example, pRefData is the actual FILE *
* but it can be whatever you want...
*/
nStatus = fprintf((FILE *)pRefData, "%s\n", pszLine);
return nStatus;
}
|
