c語言中visual studio中用fopen打不開檔案-有解無憂

uj5u.com熱心網友回復：

30改為256

uj5u.com熱心網友回復：

檔案名輸類似d:\mydir\filename.ext這樣的全路徑

uj5u.com熱心網友回復：

修改如下，供參考：

#include<stdio.h>

#include<stdlib.h>

#include<string.h>



void copyFile(char infile[],char outfile[])

{

     FILE *fp1,*fp2;

     char line[256];

     if((fp1=fopen(infile,"r"))==NULL){

        printf("Can't open file %s!\n",infile);

        exit(1);

     }

     if((fp2=fopen(outfile,"w"))==NULL){

        printf("Can't open file %s!\n",outfile);

        exit(2);

     }

     while(fgets(line,100,fp1)!=NULL){

         puts(line);

         fputs(line,fp2);

     }

     fclose(fp1);

     fclose(fp2);

}





int main()

{

                         //FILE *fp1,*fp2;

     char infile[30],outfile[30];

                         //char *p=infile;

                         //char *q=outfile;

                        //int  i;

     printf("請輸入需要讀取的檔案名:");

     gets(infile);

                        //for(i=0;p<infile+30;p=p+i,i++){

                        //    if(*p=='\n')*p='\0';

                        //}

     printf("請輸入輸出的檔案名:");

     gets(outfile);

                       //for(i=0;q<outfile+30;q=q+i,i++){

                       //    if(*q=='\n')*q='\0';

                       //}

                       //printf("需要讀取的檔案名為:%s",infile);

                       //putchar('\n');

     copyFile(infile,outfile);

                       //fclose(fp1);

                       //fclose(fp2);

     

     return 0;

}

uj5u.com熱心網友回復：

參考 3 樓 qzjhjxj 的回復:

修改如下，供參考：

#include<stdio.h>

#include<stdlib.h>

#include<string.h>



void copyFile(char infile[],char outfile[])

{

     FILE *fp1,*fp2;

     char line[256];

     if((fp1=fopen(infile,"r"))==NULL){

        printf("Can't open file %s!\n",infile);

        exit(1);

     }

     if((fp2=fopen(outfile,"w"))==NULL){

        printf("Can't open file %s!\n",outfile);

        exit(2);

     }

     while(fgets(line,100,fp1)!=NULL){

         puts(line);

         fputs(line,fp2);

     }

     fclose(fp1);

     fclose(fp2);

}





int main()

{

                         //FILE *fp1,*fp2;

     char infile[30],outfile[30];

                         //char *p=infile;

                         //char *q=outfile;

                        //int  i;

     printf("請輸入需要讀取的檔案名:");

     gets(infile);

                        //for(i=0;p<infile+30;p=p+i,i++){

                        //    if(*p=='\n')*p='\0';

                        //}

     printf("請輸入輸出的檔案名:");

     gets(outfile);

                       //for(i=0;q<outfile+30;q=q+i,i++){

                       //    if(*q=='\n')*q='\0';

                       //}

                       //printf("需要讀取的檔案名為:%s",infile);

                       //putchar('\n');

     copyFile(infile,outfile);

                       //fclose(fp1);

                       //fclose(fp2);

     

     return 0;

}

 while(fgets(line, sizeof(line),fp1)!=NULL)

改一下～

uj5u.com熱心網友回復：

參考 3 樓 qzjhjxj 的回復:

修改如下，供參考：

#include<stdio.h>

#include<stdlib.h>

#include<string.h>



void copyFile(char infile[],char outfile[])

{

     FILE *fp1,*fp2;

     char line[256];

     if((fp1=fopen(infile,"r"))==NULL){

        printf("Can't open file %s!\n",infile);

        exit(1);

     }

     if((fp2=fopen(outfile,"w"))==NULL){

        printf("Can't open file %s!\n",outfile);

        exit(2);

     }

     while(fgets(line,100,fp1)!=NULL){

         puts(line);

         fputs(line,fp2);

     }

     fclose(fp1);

     fclose(fp2);

}





int main()

{

                         //FILE *fp1,*fp2;

     char infile[30],outfile[30];

                         //char *p=infile;

                         //char *q=outfile;

                        //int  i;

     printf("請輸入需要讀取的檔案名:");

     gets(infile);

                        //for(i=0;p<infile+30;p=p+i,i++){

                        //    if(*p=='\n')*p='\0';

                        //}

     printf("請輸入輸出的檔案名:");

     gets(outfile);

                       //for(i=0;q<outfile+30;q=q+i,i++){

                       //    if(*q=='\n')*q='\0';

                       //}

                       //printf("需要讀取的檔案名為:%s",infile);

                       //putchar('\n');

     copyFile(infile,outfile);

                       //fclose(fp1);

                       //fclose(fp2);

     

     return 0;

}

使用fputs函式會引入額外的'\n'，因為fgets會有'\n'，而fputs又會加'\n'

uj5u.com熱心網友回復：

大概率是路徑不對，你訪問的檔案不在你以為的位置。

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