spliting_file.cpp

本程序介绍了如何用C语言快速读写磁盘文件。

#include <stdio.h>
#include <stdlib.h>


//Spliting one file to two small files.
void Split_File_test( char Src_File[],     //The input file name & path.
				      char Dst_File1[],    //The output file1 name & path.
					  char Dst_File2[],    //The output file2 name & path.
				      int Dst_File1_Size ) //Size of Dst_File1( M Bytes ).
{
	FILE *fp_in,*fp_out1,*fp_out2;
	unsigned char ch;
	int i = 0;

	Dst_File1_Size = Dst_File1_Size * 1024 * 1024;  //Bytes Number

	if( (fp_in = fopen( Src_File, "rb" )) == NULL )
	{
		printf("cannot open the input file\n");
		exit(0);
	}
	if( (fp_out1 = fopen( Dst_File1, "wb" )) == NULL )
	{
		printf("cannot open the output file\n");
		exit(0);
	}
	if( (fp_out2 = fopen( Dst_File2, "wb" )) == NULL )
	{
		printf("cannot open the output file\n");
		exit(0);
	}

	while(1)  
	{
		ch = fgetc(fp_in);
		if( feof(fp_in) )   
		{
			printf( "\nSeconed file ok, %d bytes\n", i - Dst_File1_Size );
			break;          
		}
		if( i++ < Dst_File1_Size )
		{
			fputc( ch, fp_out1 );
			continue;
		}
		else
		{
			if( i == Dst_File1_Size + 1 )
				printf( "\nFirst file ok, %d bytes", i - 1 );
			fputc( ch, fp_out2 );
			continue;
		}

	}

	fclose(fp_in);
	fclose(fp_out1);
	fclose(fp_out2);

	return;
}

#if 0
void Split_File_test( char Src_File[],char Dst_File1[],char Dst_File2[],int Dst_File1_Size )
{
//	int Dst_File1_Size = 104857600;
//	char Src_File[] = "F:\\Download_temp\\nfs5.exe";
//	char Dst_File1[] = "F:\\Download_temp\\1.exe";
//	char Dst_File2[] = "F:\\Download_temp\\2.exe";

	Spliting_File( Src_File, Dst_File1, Dst_File2, Dst_File1_Size );

	return;
}
#endif