CODEWITHSUNDEEP
cfile-ioiofwrite
Nazarii Plebanskii
Nazarii Plebanskii

Reputation: 353

C function fwrite() doesn't write in file

I'm trying to write structures from tempGroupFile into GroupFile. fwrite() returns 1, when writing, but actually no data is written in the file GroupFile. Function printRec() prints out the structure on the screen. data is a variable of structure. File GroupFile is empty after these operations. Code:

GWTemp = fopen(tempGroupFile, "rb");
GW = fopen(GroupFile, "wb"); 
if((GW == NULL) || (GWTemp == NULL))
{
    puts("Failed to open file.");
    fflush(stdin);
    getchar();
    return 0;
}
while(fread(&data, sizeof data, 1, GWTemp))
{
    if(fwrite(&data, sizeof data, 1, GW))
    {
        printRec(data);
    }
}

Upvotes: 4

Views: 10589

Answers (1)

blh83
blh83

Reputation: 495

You need to close the file using fclose(GW) after the while loop. This makes sure all buffers are flushed so the file is written.

Upvotes: 6

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