Can't load a .bmp using stbi_load - c

Question

I'm trying to load an image using stbi_load but it keeps returning NULL.
I have something like this:
unsigned char *img;
int width, height, channels;
img = stbi_load("\\\work_server\\file\\another file\\and another file\\img.bmp", &width, &height, &channels, 1);
I was thinking the problem was the file path and all the \.
I used double \ because before I doubled them, it was giving me a warning:
warning: unknown escape sequence: '\P'
And, although my path has double \ at the beginning, if I use four \ instead, I get this error:
0 [main] border_image_processing 161 cygwin_exception::open_stackdumpfile: Dumping stack trace to border_image_processing.exe.stackdump
So I'm using three \, now.
But still, when I run my code, stbi_load keeps returning NULL.
Not sure if the problem is the file path, or I'm messing something with pointers/types. But, I thought stbi_load returned an unsigned char*. If I store it in img (an unsigned char*), I should be getting the address of the first pixel inside of img, right?
Not sure exactly what my problem is, and how to diagnose it. Thanks in advance.
EDIT: I'm doing this now:
img = stbi_load("\\\\work_server\\file\\another file\\and another file\\img.bmp", &width, &height, &channels, 1);
if(img == NULL){
printf("%s\n", stbi_failure_reason());
printf("Error in loading the image\n");
exit(1);
}
But the error happens before it returns anything. The error is before the breakpoint on the line of the if condition.
Error message:
0 [main] border_image_processing 406 cygwin_exception::open_stackdumpfile: Dumping stack trace to filename.exe.stackdump
EDIT2:
I tried 3 different images on the same file, and it keeps giving the same error. Then I copied one of them to my local files (from the network server).
img = stbi_load("Documents\\img.bmp", &width, &height, &channels, 1);
And now I got this: can't fopen Error in loading the image. So it's both an issue of accessing the network/that path and something else?
EDIT3: I've copied the image into both project_filename and src_file and Debug. Tried using both stbi_load(img.exe) and the entire path C:\\Users\\ATS\\...\\img.exe for every situation. None of them worked. All of them started "dumping to stack" again.
The stackdump file says STATUS ACCESS VIOLATION. Does that gotta do with permissions in my pc? It's a corporate laptop, it had other users. Although I do not require admin.user/admin.password to install stuff, maybe the stbi_load needs it?
Anyways, stackdump file below:
Exception: STATUS_ACCESS_VIOLATION at rip=00010040A7D9
rax=0031000000300039 rbx=0000000A000023FD rcx=0000000A00002220
rdx=00000000FFFFFFFF rsi=0000000000000020 rdi=000000000000000A
r8 =00000007FFFFCA7C r9 =0000000000000007 r10=0000000800000000
r11=0000000100401D94 r12=00000007FFFFCC10 r13=00000007FFFFCC20
r14=0000000000000001 r15=0000000000000000
rbp=00000007FFFFCAF0 rsp=00000007FFFFCAC0
program=C:\Users\ATSlooking4things\eclipse-workspace\filename\Debug\filename.exe, pid 541, thread main
cs=0033 ds=002B es=002B fs=0053 gs=002B ss=002B
Stack trace:
Frame Function Args
0007FFFFCAF0 00010040A7D9 (0007FFFFFFFF, 0007FFFFCB40, 0007FFFFCB3C, 000000000001) filename.exe+0xA7D9
0007FFFFCBA0 00010040AC4A (7FFE30608035, 0007FFFFCC20, 000000000002, 7FFE308DF160) filename.exe+0xAC4A
0007FFFFCD30 7FFE306080A1 (000000000000, 000000000000, 000000000000, 000000000000) cygwin1.dll+0x80A1
0007FFFFFFF0 7FFE30605C86 (000000000000, 000000000000, 000000000000, 000000000000) cygwin1.dll+0x5C86
0007FFFFFFF0 7FFE30605D34 (000000000000, 000000000000, 000000000000, 000000000000) cygwin1.dll+0x5D34
End of stack trace
Loaded modules:
000100400000 filename.exe
7FFE74050000 ntdll.dll
7FFE73DA0000 KERNEL32.DLL
7FFE73AC0000 KERNELBASE.dll
0003FFA40000 cyggcc_s-seh-1.dll
7FFE30600000 cygwin1.dll
7FFE72540000 advapi32.dll
7FFE72B10000 msvcrt.dll
7FFE72310000 sechost.dll
7FFE73990000 RPCRT4.dll
7FFE710D0000 CRYPTBASE.DLL
7FFE71780000 bcryptPrimitives.dll
7FFE57A70000 netapi32.dll
7FFE70CD0000 LOGONCLI.DLL
7FFE719D0000 ucrtbase.dll
7FFE70BA0000 NETUTILS.DLL
7FFE71D70000 wldap32.dll
7FFE72430000 WS2_32.DLL
7FFE70EC0000 mswsock.dll
7FFE715C0000 SspiCli.dll
7FFE63160000 DSPARSE.dll
7FFE70F90000 kerberos.DLL
7FFE718C0000 msvcp_win.dll
7FFE712F0000 MSASN1.dll
7FFE70F30000 cryptdll.dll
7FFE71D40000 bcrypt.dll
7FFE70BB0000 DNSAPI.dll
7FFE70B60000 IPHLPAPI.DLL
7FFE725F0000 NSI.dll
0000621A0000 mdnsNSP.dll
7FFE65640000 rasadhlp.dll
7FFE68CB0000 fwpuclnt.dll
7FFE61BF0000 SAMCLI.DLL
7FFE61B60000 SAMLIB.dll
I then ran addr2line -f -C -e filename.exe with the first 2 function addresses 00010040A7D9 and 00010040AC4A. Got back push and main, the name of the two problematic functions(?).
void push(list_t * head, int val) {
list_t * current = head;
while (current->next != NULL) {
current = current->next;
}
current->next = (list_t *) malloc(sizeof(list_t));
current->next->val = val;
current->next->next = NULL;
}
Still no clue. It surprises me it says something about push.
I tried adding breakpoints before running, but it doesn't stop at ANY breakpoint. How? What's happening?
And no, the "skip all breakpoints" button is not pushed. All the breakpoints are enabled.
So... time to start using the good ol' printf("jibberish") as a debug method. And it turns out, it runs stbi_load, and it doesn't return NULL.
All this time I was assuming it crashed on stbi_load because it didn't stop at the breakpoint. But instead, the breakpoints don't work. Great. Time to find what's wrong, one printf at a time.
Conclusion: The problem was something completely unrelated. I declared the headers for several lists at the beginning of main, but never asigned a list->val for the head. What I was doing was "pushing" the subsequent nodes on top of an empty head. The push function was blowing up.
Thanks Eclipse IDE for having useless breakpoints, and thanks everyone who helped.

Answer 1

As edited in the post, the problem wasn't what I thought it was. stbi_load() was, in fact, working. But Eclipse breakpoints weren't.