Problem reading file using Visual C++ FOrms

Question

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Hello,

I'm building a graphical program and i need to read a file to a string. The file contains simple HTML code.

Now,

If a create a blank project and add .c/.cpp file this code works fines, copying the whole file to the string.

C#

FILE *f;
int tamanho;
char *asd;

f=fopen("mail.txt","r");
if(f==NULL)
      erro("Erro abrir file");

fseek(f,0,SEEK_END);
tamanho=ftell(f);
rewind(f);
asd=(char *)malloc(tamanho+1);
fread(asd,1,tamanho,f);

Howerver if i create a windows form application and use the same code it only copies a few lines from the beggining.

I noticed that when using forms visual studio uses c++ compiler and when using blank project with .c files it uses a c compiler, i've tryed both compilers and it copies the string, the problem seem to when i use forms

Need help,

Posted 10-Dec-11 6:59am

Cr4zYPT

Updated 10-Dec-11 7:00am

v2

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Comments

Richard MacCutchan 11-Dec-11 5:55am

This has nothing to do with C, C++ or Forms, but rather to what is going on in your program after you have read the file. You need to step through your code with the debugger to check what data is being read and how you are processing it.

3 solutions

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Addy Tas · Answer 1 · 2011-12-10T12:04:00

Solution 1

There is a minor issue with ftell; it is not guranteed to work ok for text files. See
ftell [^] for details.

Try getting the file size using GetFileSize or as recommend GetFileSizeEx (GetFileSizeEx [^], you will need a handle but i'm sure that's not going to be a problem.

Hope this helps,

Cheers, AT

Posted 10-Dec-11 12:04pm

Addy Tas

Updated 10-Dec-11 12:08pm

v2

Humberto · Answer 2 · 2011-12-10T22:41:00

Solution 2

Open the file in binary mode.
Something like that:

C++

f=fopen("mail.txt","rb");

Posted 10-Dec-11 22:41pm

Humberto

Comments

Cr4zYPT 11-Dec-11 7:49am

I've tryed bynary and also didn't work

Humberto 11-Dec-11 14:26pm

Try this modification to the read statement:

if ( fread(asd,1,tamanho,f) != tamanho) {
free(asd);
fclose(f);
erro("Erro de leitura");
}

and see if it calls erro().

Richard MacCutchan · Answer 3 · 2011-12-10T23:58:00

Solution 3

I just realised this is actually a continuation of the problem you reported here[^], about which I made some suggestions - did you follow them, or indeed check exactly what data you are reading into your code?

Posted 10-Dec-11 23:58pm

Richard MacCutchan