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Why this code snippet
DataRootDir data = rootdir[i];
fwrite (data, sizeof(DataRootDir), 1, arq);
always returns the error
error: cannot convert 'DataRootDir' to 'const void*' for argument '1' to 'size_t fwrite(const void*, size_t, size_t, FILE*)'|
and how to resolve.
Complete code:
#include <iostream>
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <cstring>
using namespace std;
typedef struct DataRootDir {
int tipo;
char nome[256];
char extensao[4];
int data;
int hora;
int tam;
char atributos;
int primeiroBloco;
} DataRootDir;
void saveHD(DataRootDir *rootdir){
FILE *arq;
arq = fopen("HD.dat", "wb"); // Cria um arquivo binário para gravação
if (arq == NULL) {
cout << "Problemas na criação do arquivo" << endl;
}
else{
for(int i = 0; i < 512; i++){
DataRootDir data = rootdir[i];
fwrite (data, sizeof(DataRootDir), 1, arq);
}
fclose(arq);
}
}
DataRootDir* createRootDir(){
DataRootDir *rootdir = (DataRootDir *) malloc(sizeof(DataRootDir) * 512);
for(int j = 0; j < 512; j++){
DataRootDir *drd = (DataRootDir *) malloc(sizeof(DataRootDir));
drd->tipo = 0;
strcpy(drd->nome, "");
strcpy(drd->extensao, "");
drd->data = 0;
drd->hora = 0;
drd->tam = 0;
drd->atributos = '\0';
drd->primeiroBloco = 0;
rootdir[j] = *drd;
}
return rootdir;
}
void insertRootDir(DataRootDir *data, DataRootDir *rootdir){
for(int j = 0; j < 512; j++){
if(strcmp(rootdir[j].nome,"") == 0){
rootdir[j] = *data;
break;
}
}
}
int main(){
cout << "SIZE OF DataRootDir " << sizeof(DataRootDir) << " Bytes " << endl;
cout << "SIZE OF DataRootDir ON ARCHIVE " << sizeof(DataRootDir) * 512 << " Bytes " << (sizeof(DataRootDir) * 512) / 1024 << " KB" << endl;
DataRootDir *rootDir = createRootDir();
DataRootDir *drd = (DataRootDir *) malloc(sizeof(DataRootDir));
drd->tipo = 0;
strcpy(drd->nome, "Teste");
strcpy(drd->extensao, "txt");
drd->data = 20140219;
drd->hora = 850;
drd->tam = 35342;
drd->atributos = '\0';
drd->primeiroBloco = 1;
insertRootDir(drd,rootDir);
saveHD(rootDir);
system("pause");
}