Re: [v8-users] Partially executing a Javascript file in v8 c++ program
Hi,
function_value would be values that are passed to the function.
function_name would be a v8::String which has the javascript function name
function would be a v8::Function whcih is used to call the javascript
function.
This snippet would make it more clear
auto js_strFunction =
v8::String::NewFromUtf8(isolate,u8"main",v8::NewStringType::kNormal).ToLocalChecked();
v8::Local jsArgs;
auto js_valFunction =
context->Global()->Get(context,js_strFunction).ToLocalChecked();
auto js_Function = v8::Local::Cast(js_valFunction);
auto js_MaybeValue = js_Function->Call(context,v8::Null(isolate),0,&jsArgs);
Hope it's helpful.
On Saturday, 5 August 2017 06:07:21 UTC+5:30, Kavin Mani wrote:
>
> This gave me a good head start. However, my program crashes at
> function->Call statement.
>
> Can you please tell me what values function_value, function_name and
> function are supposed to take.I have also populated argv with random values
> since I am not using them in my function. If that could also be a reason
> for the crash, please let me know.
>
> This is my JS code :
>
> Local source =
> *String::NewFromUtf8(isolate, "'function test_function() {var match = 0;
> return match+10;}'",*
> * NewStringType::kNormal).ToLocalChecked();*
>
> *Thanks,*
> *Kavin*
>
> On Friday, August 4, 2017 at 3:29:23 PM UTC-7, Jeremy Bettis wrote:
>>
>> What I do to call a function is to use
>>
>> v8::Local function_value;
>> context->Global()->Get(context, function_name).ToLocal(&function_value);
>> v8::Local function =
>> v8::Local::Cast(function_value);
>> const int argc = arguments.size();
>> std::vector> argv(argc);
>> // populate the argv somehow
>> function->Call(context, context->Global(), argc, argv.data());
>>
>> On Fri, Aug 4, 2017 at 4:17 PM, Kavin Mani wrote:
>>
>>> Hi,
>>>
>>> I am new to V8 engine and starting to experiment things. I am wondering
>>> if it is possible to execute different functions from a Javascript file at
>>> different times.
>>>
>>> Consider the following scenario:
>>>
>>> I have a Javascript file with a global variable *foo *and two functions
>>> *func1() *and *func2().* Something like this:
>>>
>>> *Test.js:*
>>>
>>> var foo = 0;
>>>
>>> function func1() {
>>> foo = 100;
>>> }
>>>
>>> function func2() {
>>> return foo + 10;
>>> }
>>>
>>> In my *cpp* file, I want to first execute *func1() *from Test.js*, *print
>>> some random statements (need not be related to using *foo*) and then
>>> call *func2()*. Finally, I want to print the value of *foo *in my C++
>>> program. Here is what I want to do -
>>>
>>> *Test.cpp*
>>>
>>> Print some statements...
>>>
>>> Call func1()
>>>
>>> Print some more statements...
>>>
>>> Call func2()
>>>
>>> Print the value of foo
>>>
>>>
>>> Almost all of the examples that I could find takes the Javascript
>>> program as a string and executes it completely. However, I want to execute
>>> them in parts at different times. Can someone please help me to find a way
>>> to do this?
>>>
>>> Thanks,
>>> Kavin
>>>
>>> --
>>> --
>>> v8-users mailing list
>>> v8-u...@googlegroups.com
>>> http://groups.google.com/group/v8-users
>>> ---
>>> You received this message because you are subscribed to the Google
>>> Groups "v8-users" group.
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>>> an email to v8-users+u...@googlegroups.com.
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>>>
>>
>>
>>
>> --
>> Jeremy Bettis | Staff Software Engineer | jbe...@google.com |
>> 303-257-2486
>>
>
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Re: [v8-users] Partially executing a Javascript file in v8 c++ program
This gave me a good head start. However, my program crashes at
function->Call statement.
Can you please tell me what values function_value, function_name and
function are supposed to take.I have also populated argv with random values
since I am not using them in my function. If that could also be a reason
for the crash, please let me know.
This is my JS code :
Local source =
*String::NewFromUtf8(isolate, "'function test_function() {var match = 0;
return match+10;}'",*
* NewStringType::kNormal).ToLocalChecked();*
*Thanks,*
*Kavin*
On Friday, August 4, 2017 at 3:29:23 PM UTC-7, Jeremy Bettis wrote:
>
> What I do to call a function is to use
>
> v8::Local function_value;
> context->Global()->Get(context, function_name).ToLocal(&function_value);
> v8::Local function =
> v8::Local::Cast(function_value);
> const int argc = arguments.size();
> std::vector> argv(argc);
> // populate the argv somehow
> function->Call(context, context->Global(), argc, argv.data());
>
> On Fri, Aug 4, 2017 at 4:17 PM, Kavin Mani > wrote:
>
>> Hi,
>>
>> I am new to V8 engine and starting to experiment things. I am wondering
>> if it is possible to execute different functions from a Javascript file at
>> different times.
>>
>> Consider the following scenario:
>>
>> I have a Javascript file with a global variable *foo *and two functions
>> *func1() *and *func2().* Something like this:
>>
>> *Test.js:*
>>
>> var foo = 0;
>>
>> function func1() {
>> foo = 100;
>> }
>>
>> function func2() {
>> return foo + 10;
>> }
>>
>> In my *cpp* file, I want to first execute *func1() *from Test.js*, *print
>> some random statements (need not be related to using *foo*) and then
>> call *func2()*. Finally, I want to print the value of *foo *in my C++
>> program. Here is what I want to do -
>>
>> *Test.cpp*
>>
>> Print some statements...
>>
>> Call func1()
>>
>> Print some more statements...
>>
>> Call func2()
>>
>> Print the value of foo
>>
>>
>> Almost all of the examples that I could find takes the Javascript program
>> as a string and executes it completely. However, I want to execute them in
>> parts at different times. Can someone please help me to find a way to do
>> this?
>>
>> Thanks,
>> Kavin
>>
>> --
>> --
>> v8-users mailing list
>> v8-u...@googlegroups.com
>> http://groups.google.com/group/v8-users
>> ---
>> You received this message because you are subscribed to the Google Groups
>> "v8-users" group.
>> To unsubscribe from this group and stop receiving emails from it, send an
>> email to v8-users+u...@googlegroups.com .
>> For more options, visit https://groups.google.com/d/optout.
>>
>
>
>
> --
> Jeremy Bettis | Staff Software Engineer | jbe...@google.com
> | 303-257-2486
>
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Re: [v8-users] Partially executing a Javascript file in v8 c++ program
What I do to call a function is to use
v8::Local function_value;
context->Global()->Get(context, function_name).ToLocal(&function_value);
v8::Local function =
v8::Local::Cast(function_value);
const int argc = arguments.size();
std::vector> argv(argc);
// populate the argv somehow
function->Call(context, context->Global(), argc, argv.data());
On Fri, Aug 4, 2017 at 4:17 PM, Kavin Mani wrote:
> Hi,
>
> I am new to V8 engine and starting to experiment things. I am wondering if
> it is possible to execute different functions from a Javascript file at
> different times.
>
> Consider the following scenario:
>
> I have a Javascript file with a global variable *foo *and two functions
> *func1() *and *func2().* Something like this:
>
> *Test.js:*
>
> var foo = 0;
>
> function func1() {
> foo = 100;
> }
>
> function func2() {
> return foo + 10;
> }
>
> In my *cpp* file, I want to first execute *func1() *from Test.js*, *print
> some random statements (need not be related to using *foo*) and then call
> *func2()*. Finally, I want to print the value of *foo *in my C++ program.
> Here is what I want to do -
>
> *Test.cpp*
>
> Print some statements...
>
> Call func1()
>
> Print some more statements...
>
> Call func2()
>
> Print the value of foo
>
>
> Almost all of the examples that I could find takes the Javascript program
> as a string and executes it completely. However, I want to execute them in
> parts at different times. Can someone please help me to find a way to do
> this?
>
> Thanks,
> Kavin
>
> --
> --
> v8-users mailing list
> v8-users@googlegroups.com
> http://groups.google.com/group/v8-users
> ---
> You received this message because you are subscribed to the Google Groups
> "v8-users" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to v8-users+unsubscr...@googlegroups.com.
> For more options, visit https://groups.google.com/d/optout.
>
--
Jeremy Bettis | Staff Software Engineer | jbet...@google.com | 303-257-2486
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