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file/read_binary.cpp

@@ -0,0 +1,50 @@
+/*
+AUTORE: Manuel Vichi 3^AIN
+Legge da un file binario e memorizza in un array.
+*/
+#include <iostream>
+using namespace std;
+size_t readValues(FILE* fptr, int storage[]) {
+	rewind(fptr);
+	size_t size = sizeof(storage) / sizeof(storage[0]);
+	for (size_t i = 0; i < size; i++) {
+		storage[i] = 0;
+	}
+	return fread(&storage,sizeof(int),size,fptr);
+}
+size_t readValuesLoop(FILE* fptr, int storage[]) {
+	rewind(fptr);
+	int value = 0;
+	size_t size = sizeof(storage) / sizeof(storage[0]);
+	for (size_t i = 0; i < size; i++) {
+		storage[i] = 0;
+	}
+	size_t counter = 0;
+    while (fread(&value, sizeof(int), 1, fptr) == 1 && counter < sizeof(storage)) {
+        storage[counter] = value;
+        counter++;
+    }
+    return counter;
+}
+int main(void) {
+	FILE* file = fopen("file_70.bin","rb");
+	if (file != NULL) {
+		int arr[100];
+		int arr2[100];
+		cout << "Valori letti (singola fread): " << readValues(file,arr) << endl;
+		cout << "Valori letti (ciclo while): " << readValuesLoop(file,arr2) << endl;
+		cout << "Array 1: ";
+		size_t size = sizeof(arr) / sizeof(arr[0]);
+		for (size_t i = 0; i < size; i++) {
+			cout << arr[i] << " ";
+		}
+		cout << endl << "Array 2: ";
+		size = sizeof(arr2) / sizeof(arr2[0]);
+		for (size_t i = 0; i < sizeof(arr2); i++) {
+			cout << arr2[i] << " ";
+		}
+		cout << endl;
+		fclose(file);
+	}
+	return 0;
+}

file/write_binary.cpp

@@ -0,0 +1,20 @@
+/*
+AUTORE: Manuel Vichi 3^AIN
+Scrive in un file binario degli interi da un'array
+*/
+#include <iostream>
+using namespace std;
+int main(void) {
+	size_t written = 0;
+	FILE* file = fopen("giovanni.bin","wb");
+	if (file != NULL) {
+		int a[] = {1, 2, 3, 4, 5, 6, 7, 8, 9};
+    	int n = sizeof(a) / sizeof(a[0]);
+    	written = fwrite(&a, sizeof(int), n, file);
+    	fclose(file);
+	}
+    if (written > 0) {
+    	return 0;
+	}
+	return -1;
+}