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This compliant solution uses the Windows GetFileSizeEx() function to determine the size of the file on a 32- or 64-bit OS.:
| Code Block | ||||
|---|---|---|---|---|
| ||||
HANDLE file;
LARGE_INTEGER file_size;
char *buffer;
file = CreateFile(TEXT("foo.bin"), GENERIC_READ, 0, NULL,
OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
if (INVALID_FILE_HANDLE == file) {
/* Handle error */
}
if (!GetFileSizeEx(file, &file_size)) {
/* Handle error */
}
/* Note: 32-bit portability issue with LARGE_INTEGER truncating to a size_t */
buffer = (char*)malloc(file_size);
if (buffer == NULL) {
/* Handle error */
}
/* ... */
|
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This noncompliant code example attempts to open a text file in text mode and use fseek() and ftell() to obtain the file size.:
| Code Block | ||||
|---|---|---|---|---|
| ||||
FILE *fp;
long file_size;
char *buffer;
fp = fopen("foo.txt", "r");
if (fp == NULL) {
/* Handle error */
}
if (fseek(fp, 0 , SEEK_END) != 0) {
/* Handle error */
}
file_size = ftell(fp);
if (file_size == -1) {
/* Handle error */
}
buffer = (char*)malloc(file_size);
if (buffer == NULL) {
/* Handle error */
}
/* ... */
|
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