C file input operation

Copy file

// Copy file 
#pragma warning(disable:4996)

#include<stdio.h>
#include<stdlib.h>
#include<errno.h >
#include <string.h>
#include<stdbool.h>
bool copy_file(const char *src, const char* dest)
{
    
	char buf[512] = {
     0 };
	int file_size = 0;
	FILE* f_src = NULL;
	FILE* f_dest = NULL;

	if ((f_src = fopen(src, "rb")) != NULL)// If the source file is not empty   Read this file 
	{
    
		if ((f_dest = fopen(dest, "wb")) != NULL) // If the target file is not empty   Writing documents 
		{
    
			//1) buffer Is the address to receive data , about fread To read the address of data , That is, the address where the data is saved 
			//2) size Is the number of single bytes of content to be read .
			//3) count Is it necessary to read out size The number of data items in bytes .
			//4) stream Pointer to the target file .
			while((file_size=fread(buf,sizeof(char),sizeof(buf),f_src))>0)//fread The function is used to read data from a file stream , Its function prototype is ：size_t fread(void* buffer, size_t size, size_t count, FILE*stream);
			{
    
				fwrite(buf, file_size, sizeof(char), f_dest);// Write data to f_dest This flow 
				memset(buf,0,sizeof(buf));// Clear data 

			}
			fclose(f_dest);
			fclose(f_src);

			return true;
		
		}
	
	}
	return false;
}

int main() {
    



	copy_file("D:\\fileTest\\233.txt", "D:\\fileTest\\233233.txt");
	//remove("D:\\fileTest\\233233.txt");// Delete file 
	system("pause");


	return 0;


}

File read and write

#pragma warning(disable:4996)
#if 0
#include<stdio.h>
#include<stdlib.h>
#include<errno.h >
#include <string.h>
int main() {
    
	// The latter mode is adjustable 
	//w( Just write )
	//r( read-only )
	//a( additional   Add you after the previous content fprintf What's in it )
	//w+ r+ a+ // All read and write 
	//r+b // Read binary 
	//w+b // Binary write 
#if 0
	FILE* p = fopen("D:/fileTest/flieopen.txt", "w");//D:\fileTest The path is copied like this  \ Change it into / perhaps \\ // Note that it is not safe to use this method forcibly. Please add #pragma warning(disable:4996)
	fprintf(p, "55555 \n");
	fclose(p);
#endif // 0

#if 0
	// Read the file 
	// The first parameter path   The second is format  r Indicates read-only  w write in 
	FILE* p = fopen("D:/fileTest/flieopen.txt", "r");//D:\fileTest The path is copied like this  \ Change it into / perhaps \\ // Note that it is not safe to use this method forcibly. Please add #pragma warning(disable:4996)
	char buff[256];
	fgets(buff, 255, p);// Parameters ：buff buff Size  p object  fgets Get array fgetc Character acquisition 
	printf("%s", buff);
	fclose(p);

#endif // 0

#if 0
	// Read the file 
	// The first parameter path   The second is format  r Indicates read-only  w write in 
	FILE* p = fopen("D:/fileTest/flieopen.txt", "w");//D:\fileTest The path is copied like this  \ Change it into / perhaps \\ // Note that it is not safe to use this method forcibly. Please add #pragma warning(disable:4996)
	fprintf(p, "55555 \n");
	fseek(p,2,SEEK_SET);// The cursor 
	fprintf(p, "666 \n");// It is equivalent to replacing the three digits behind the cursor with 666
	fclose(p);

#endif // 0

	// Error handling   If opening the file fails 
	FILE* p = fopen("D:/fileTest/flieopen.txt", "w");
	if (!p) 
	{
    
		int ErrorCode = errno;
		fprintf(stderr, " The error code is : %d", ErrorCode);//stderr Is a global error flow 
		fprintf(stderr," error message ： %s\n",strerror(ErrorCode));

		system("pause");
		exit(-1); //EXIT_FAILURE EXIT_SUCCESS


	}
	fclose(p);

	system("pause");
	exit(EXIT_SUCCESS);

	return 0;


}
#endif // 0