Hi All,
I have got a test-app which is used for testing our application. When we
run test-app we create output.xml for each of the test-cases which were
executed.
Since in emscripten we can't create a new file on local file system i.e on
local machine. On digging I come around IDBFS file system support in
emscripten : by using this file system we can mock writing new file to
local file system where the actual file are written to indexed db.
So for testing I have created POC attached is the cpp file : untitled.cpp
Command used :
emcc untitled.cpp -o filetest.html -lidbfs.js -s FETCH=1 -s
FORCE_FILESYSTEM=1 -s NO_EXIT_RUNTIME=1
Let me just brief you about the code :
1) I have mounted following directory in IDBFS : "working1"
EM_ASM(
FS.mkdir('/working1');
FS.mount(IDBFS, {}, '/working1');
FS.syncfs(true, function (err) {
assert(!err);
});
);
2) call util_create func which in turn call test func. In test func I am
creating new file "/working1/twrite.txt" *"/working1/**working2/*
*twrite1.txt"* and "/working1/twrite2.txt"
3) call sync_idbfs() which is used to persists changes in indexed db i.e.
working1
Error : when call read_fs(func used for reading file) on file :*"/working1/*
*working2/**twrite1.txt" ->* I am getting following error : stdio streams
had content in them that was not flushed. you should set EXIT_RUNTIME to 1
(see the FAQ), or make sure to emit a newline when you printf etc.
please note that in all my printf statement I have got \n and also the flag
is passed while compiling.
And also, I am not able to see following file
*"/working1/**working2/**twrite1.txt"
in indexed db of browser but I am able to see following file twrite.txt and
twrite2.txt.*
*So my question is that , has anyone created a sub directory using IDBFS
file system. And pointer on the same i.e what all thing I can try.*
Please note that I have unsuccessfully tried following thing :
1) before mounting creating sub directory as well i.e. FS.mkdir('/working1');
and FS.mkdir('/working1/working2');
2) before creating new file in sub directory i,e
FS.mkdir('/working1/working2');
and creating new file in sub dir.
Regards,
Anshul
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#include <stdio.h>
#include <stdlib.h>
#include <emscripten.h>
void sync_idbfs() {
EM_ASM(
FS.syncfs(false,function (err) {});
);
}
extern "C" void EMSCRIPTEN_KEEPALIVE test(){
FILE* fp = fopen("/working1/twrite.txt", "rt");
if(!fp){
fp = fopen("/working1/twrite.txt", "a");
}
if (fp) {
fprintf(fp, "This is twrite.txt.\n");
fclose(fp);
}
FILE* fp1 = fopen("/working1/working2/twrite1.txt", "rt");
if(!fp1){
fp1 = fopen("/working1/working2/twrite1.txt", "a");
}
if (fp1) {
fprintf(fp1, "This is twrite1.txt.\n");
fclose(fp1);
}
FILE* fp2 = fopen("/working1/twrite2.txt", "rt");
if(!fp2){
fp2 = fopen("/working1/twrite2.txt", "a");
}
if (fp2) {
fprintf(fp2, "This is twrite2.txt.\n");
fclose(fp2);
}
}
void util_create(){
test();
}
void read_fs(const char* fname) {
FILE* fp = fopen(fname, "rt");
if(!fp){
printf("cannot open file");
}
if (fp) {
while (!feof(fp)) {
char c = fgetc(fp);
if (c != EOF) {
putchar(c);
}
}
fclose(fp);
}
}
void write_fs() {
FILE* fp = fopen("t3.txt", "a");
if (fp) {
fprintf(fp, "This is t3.txt.\n");
fclose(fp);
}
}
int main() {
printf("testing started\n");
write_fs();
EM_ASM(
FS.mkdir('/working1');
FS.mount(IDBFS, {}, '/working1');
FS.syncfs(true, function (err) {
assert(!err);
});
);
util_create();
sync_idbfs();
printf("Second time reading testing started after appending\n");
read_fs("/working1/twrite.txt");
printf("Third time reading testing started after appending\n");
read_fs("/working1/twrite2.txt");
read_fs("/working1/working2/twrite1.txt");
return 0;
}
