I am attempting to compile some code that I got in an ISO document for barcode generation. When I try to compile it in MS Visual C++, I get the following error:
I have put the line in question in bold and red below. Does anyone have any suggestions? Thanks in advance.Quote:
mappings.cpp(147) : error C2440: '=' : cannot convert from 'void *' to 'int *'
Code:#include <stdio.h>
#include <alloc.h>
#include <stdlib.h>
int nrow, ncol, *array;
/* "module" places "chr+bit" with appropriate wrapping within array[] */
void module(int row, int col, int chr, int bit)
{
if (row < 0) { row += nrow; col += 4 - ((nrow+4)%8); }
if (col < 0) { col += ncol; row += 4 - ((ncol+4)%8); }
array[row*ncol+col] = 10*chr + bit;
}
/* "utah" places the 8 bits of a utah-shaped symbol character in ECC200 */
void utah(int row, int col, int chr)
{
module(row-2,col-2,chr,1);
module(row-2,col-1,chr,2);
module(row-1,col-2,chr,3);
module(row-1,col-1,chr,4);
module(row-1,col,chr,5);
module(row,col-2,chr,6);
module(row,col-1,chr,7);
module(row,col,chr,8);
}
/* "cornerN" places 8 bits of the four special corner cases in ECC200 */
void corner1(int chr)
{
module(nrow-1,0,chr,1);
module(nrow-1,1,chr,2);
module(nrow-1,2,chr,3);
module(0,ncol-2,chr,4);
module(0,ncol-1,chr,5);
module(1,ncol-1,chr,6);
module(2,ncol-1,chr,7);
module(3,ncol-1,chr,8);
}
void corner2(int chr)
{
module(nrow-3,0,chr,1);
module(nrow-2,0,chr,2);
module(nrow-1,0,chr,3);
module(0,ncol-4,chr,4);
module(0,ncol-3,chr,5);
module(0,ncol-2,chr,6);
module(0,ncol-1,chr,7);
module(1,ncol-1,chr,8);
}
void corner3(int chr)
{
module(nrow-3,0,chr,1);
module(nrow-2,0,chr,2);
module(nrow-1,0,chr,3);
module(0,ncol-2,chr,4);
module(0,ncol-1,chr,5);
module(1,ncol-1,chr,6);
module(2,ncol-1,chr,7);
module(3,ncol-1,chr,8);
}
void corner4(int chr)
{
module(nrow-1,0,chr,1);
module(nrow-1,ncol-1,chr,2);
module(0,ncol-3,chr,3);
module(0,ncol-2,chr,4);
module(0,ncol-1,chr,5);
module(1,ncol-3,chr,6);
module(1,ncol-2,chr,7);
module(1,ncol-1,chr,8);
}
/* "ecc200" fills an nrow x ncol array with appropriate values for ECC200 */
void ecc200(void)
{
int row, col, chr;
/* First, fill the array[] with invalid entries */
for (row=0; row<nrow; row++) {
for (col=0; col<ncol; col++) {
array[row*ncol+col] = 0;
}
}
/* Starting in the correct location for character #1, bit 8,... */
chr = 1; row = 4; col = 0;
do {
/* repeatedly first check for one of the special corner cases, then... */
if ((row == nrow) && (col == 0)) corner1(chr++);
if ((row == nrow-2) && (col == 0) && (ncol%4)) corner2(chr++);
if ((row == nrow-2) && (col == 0) && (ncol%8 == 4)) corner3(chr++);
if ((row == nrow+4) && (col == 2) && (!(ncol%8))) corner4(chr++);
/* sweep upward diagonally, inserting successive characters,... */
do {
if ((row < nrow) && (col >= 0) && (!array[row*ncol+col]))
utah(row,col,chr++);
row -= 2; col += 2;
}
while ((row >= 0) && (col < ncol));
row += 1; col += 3;
/* & then sweep downward diagonally, inserting successive characters,... */
do {
if ((row >= 0) && (col < ncol) && (!array[row*ncol+col]))
utah(row,col,chr++);
row += 2; col -= 2;
}
while ((row < nrow) && (col >= 0));
row += 3; col += 1;
/* ... until the entire array is scanned */
} while ((row < nrow) || (col < ncol));
/* Lastly, if the lower righthand corner is untouched, fill in fixed pattern */
if (!array[nrow*ncol-1]) {
array[nrow*ncol-1] = array[nrow*ncol-ncol-2] = 1;
}
}
/* "main" checks for valid command line entries, then computes & displays array */
void main(int argc, char *argv[])
{
int x, y, z;
if (argc <= 3) {
printf("Command line: ECC200 #_of_Data_Rows #_of_Data_Columns\n");
}
else {
nrow = ncol = 0;
nrow = atoi(argv[1]); ncol = atoi(argv[2]);
if ((nrow >= 6) && (~nrow&0x01) && (ncol >= 6) && (~ncol&0x01)) {
array = malloc(sizeof(int) * nrow * ncol);
ecc200();
for (x=0; x<nrow; x++) {
for (y=0; y<ncol; y++) {
z = array[x*ncol+y];
if (z == 0) printf(" WHI");
else if (z == 1) printf("BLK");
else printf("%3d.%d",z/10,z%10);
}
printf("\n");
}
free(array);
}
}
}
