Skip to content

Update js-from-c.md (corrections) #581

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
wants to merge 1 commit into
base: master
Choose a base branch
from
Open

Update js-from-c.md (corrections) #581

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
16 changes: 11 additions & 5 deletions docs/examples/js-from-c.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -5,23 +5,29 @@ title: Call JavaScript function from C/C++
This is the reverse example. Now, we have a JavaScript function `sum()` that calculates the sum of two numbers. Here is how we call that function from C/C++:

```c

#include <stdio.h>
#include "v7.h"

static void call_sum(struct v7 *v7) {
v7_val_t func, result, args;

enum v7_err rcode;

/* Lookup JavaScript function `sum()` */
func = v7_get(v7, v7_get_global(v7), "sum", 3);

/* Create arguments array with two numbers */
args = v7_mk_array(v7);
v7_array_push(v7, args, v7_mk_number(123.0));
v7_array_push(v7, args, v7_mk_number(456.789));
v7_array_push(v7, args, v7_mk_number(v7, 123.0));
v7_array_push(v7, args, v7_mk_number(v7, 456.789));

/* Call JavaScript function. Pass `undefined` as `this` */
result = v7_apply(v7, func, v7_mk_undefined(), args);
printf("Result: %g\n", v7_get_double(result));
rcode = v7_apply(v7, func, v7_mk_undefined(), args, &result);
if (rcode != V7_OK) {
fprintf(stderr, "apply error: %d\n", (int)rcode);
} else {
printf("Result: %g\n", v7_get_double(v7, result));
}
}

int main(void) {
Expand Down