无法将整数从javascript传递到npapi插件

Question

I am writing a simple napapi plugin where I have to print the value passed from javascript function in html page. 我正在编写一个简单的napapi插件，我必须在其中打印从html页面中的javascript函数传递的值。 But I am facing problem while doing it. 但是我在这样做时面临问题。 It works properly on firefox. 它在Firefox上正常工作。 But I want to do it on qt fancybrowser example. 但我想在qt fancybrowser示例中做到这一点。 The value printed is always 0 no matter whatever value I pass in javascript code. 无论我在javascript代码中传递什么值，输出的值始终为0。

The javascript code is as follows : javascript代码如下：

<html>
.....
<script>
function process_data()
{
    PluginObject = document.getElementById("Object");
    var i =100;
    if(PluginObject){
        ret = PluginObject.process_Data(i); 
    }
}
</script>
....
</html>

The plugin code is as follows : 插件代码如下：

.....
bool ScriptableObject::process_Data(const NPVariant* args, uint32_t argCount, NPVariant* result)
{
    printf(" process_Data\n");
    printf("\t argCount : %d\n",argCount);

    int tempi =args[0].value.intValue; 
    int tempf =args[0].value.doubleValue; 

        printf("type: %d type: %u\n",args[0].type,args[0].type);
    printf("tempi : %d tempf : %f\n",tempi,tempf);
}
......

The output is as follows : 输出如下：

process_Data
     argCount : 1
type: 4 type: 4
tempi : 0 tempf : 0.000000

Actually it should print 100 which is the value passed in var i from javascript. 实际上，它应该打印100，这是从javascript中在var i中传递的值。

Any suggestions/comments are welcome 欢迎任何建议/意见

Thanks in advance 提前致谢

Answer 1

When providing a number argument to a NPAPI method, it is undefined whether you will receive a Int32 or Double variant, so you have to handle both cases in your code. 在为NPAPI方法提供数字参数时，是否会收到Int32或Double变体是不确定的，因此您必须在代码中处理这两种情况。
Furthermore, the NPVARIANT_TO_* macros only extract the respective value - they don't do any conversion. 此外， NPVARIANT_TO_*宏仅提取相应的值-它们不进行任何转换。

To extract an integer from any numeric argument, you have to write your own code, eg something like: 要从任何数字参数中提取整数，您必须编写自己的代码，例如：

bool convertToInt(const NPVariant& v, int32_t& out) {
  if (NPVARIANT_IS_INT32(v)) {
    out = NPVARIANT_TO_INT32(v);
    return true;
  }

  if (NPVARIANT_IS_DOUBLE(v)) {
    out = NPVARIANT_TO_DOUBLE(v);
    return true;
  }

  // not a numeric variant
  return false;
}

Answer 2

From here http://code.google.com/p/chromium/issues/detail?id=68175 and here https://bugs.webkit.org/show_bug.cgi?id=49036 I understand that it is bug in WEB kit, so I add next in "npruntime.h": 从这里http://code.google.com/p/chromium/issues/detail?id=68175和这里https://bugs.webkit.org/show_bug.cgi?id=49036我了解这是WEB中的错误工具包，因此我接下来在“ npruntime.h”中添加：

#define FIX_WEB_KIT_INT32_BUG

#ifdef FIX_WEB_KIT_INT32_BUG
    #define NPVARIANT_IS_INT32(_v)   ((_v).type == NPVariantType_Int32 || (_v).type == NPVariantType_Double)
    #define NPVARIANT_TO_INT32(_v)   ((_v).type == NPVariantType_Double ? (_v).value.doubleValue : (_v).value.intValue)
#else
    #define NPVARIANT_IS_INT32(_v)   ((_v).type == NPVariantType_Int32)
    #define NPVARIANT_TO_INT32(_v)  (_v).value.intValue)
#endif

on web(from javascript) I use parseInt(myVal,10) for all int values that passed to plugin. 在网络上（来自javascript），我将parseInt（myVal，10）用于传递给插件的所有int值。 Check it on Google Chrome and Safari. 在Google Chrome和Safari上进行检查。

无法将整数从javascript传递到npapi插件

问题描述

2 个解决方案

解决方案1
1 2013-02-02 14:09:48

解决方案2
-1 2012-10-24 16:09:04

无法将整数从javascript传递到npapi插件

问题描述

2 个解决方案

解决方案1 1 2013-02-02 14:09:48

解决方案2 -1 2012-10-24 16:09:04

解决方案1
1 2013-02-02 14:09:48

解决方案2
-1 2012-10-24 16:09:04