Question

在C++中怎么调用一个js中的方法

Answer 1

例如一个test.js内容如下：
function main( input )
{
return input;
}
在C++中调用方法如下：
// vcJscript.cpp : 定义控制台应用程序的入口点。
//
#include "stdafx.h"
#import "C:/windows/system32/msscript.ocx" // msscript.ocx
using namespace MSScriptControl;
#include <fstream>
#include <string>
using namespace std;

int _tmain(int argc, _TCHAR* argv[])
{
HRESULT hr = CoInitialize(NULL);
IScriptControlPtr pScriptControl(__uuidof(ScriptControl));
pScriptControl->Language = "JavaScript";
//pScriptControl->AllowUI = TRUE;
fstream file;
file.open( "test.js" );
string strFileContent, strTemp;
char szTemp[1024]="";

do
{
file.read(szTemp, 1024);
strFileContent.append( szTemp );
memset( szTemp, 0, 1024 );
}
while ( !file.fail() );
file.close();
pScriptControl->AddCode(strFileContent.c_str());
VARIANT A = pScriptControl->Eval("main(4);");
int iRet = A.intVal;
return 0;
}
脚本控件有四种方法。其中之一是 Run()，运行子例程或函数。在调用此方法之前，指定的脚本语言、 设置 AllowUI，并将下面的脚本添加到脚本控件：
//---------------------- Begin ---------------------------

#include <stdio.h>
#import "C:/winnt/system32/msscript.ocx" // msscript.ocx
using namespace MSScriptControl;

int main(void)
{
HRESULT hr = CoInitialize(NULL);

IScriptControlPtr pScriptControl(__uuidof(ScriptControl));

// Create a VARIANT array of VARIANTs which hold BSTRs
LPSAFEARRAY psa;
SAFEARRAYBOUND rgsabound[] = { 3, 0 }; // 3 elements, 0-based
int i;

psa = SafeArrayCreate(VT_VARIANT, 1, rgsabound);
if (!psa)
{
return E_OUTOFMEMORY;
}

VARIANT vFlavors[3];
for (i = 0; i < 3; i++)
{
VariantInit(&vFlavors[i]);
V_VT(&vFlavors[i]) = VT_BSTR;
}

V_BSTR(&vFlavors[0]) = SysAllocString(OLESTR("Vanilla"));
V_BSTR(&vFlavors[1]) = SysAllocString(OLESTR("Chocolate"));
V_BSTR(&vFlavors[2]) = SysAllocString(OLESTR("Espresso Chip"));

long lZero = 0;
long lOne = 1;
long lTwo = 2;

// Put Elements to the SafeArray:
hr = SafeArrayPutElement(psa, &lZero,&vFlavors[0]);
hr = SafeArrayPutElement(psa, &lOne,&vFlavors[1]);
hr = SafeArrayPutElement(psa, &lTwo,&vFlavors[2]);

// Free Elements from the SafeArray:
for(i=0;i<3;i++)
{
SysFreeString(vFlavors[i].bstrVal);
}

// Set up Script control properties
pScriptControl->Language = "JScript";
pScriptControl->AllowUI = TRUE;
pScriptControl->AddCode(
"function MyStringFunction(Argu1,Argu2,Argu3)/
{ return /"hi there/" ;}" );

// Call MyStringFunction with the two args:
_variant_t outpar = pScriptControl->Run("MyStringFunction", &psa);

// Convert VARIANT to C string:
_bstr_t bstrReturn = (_bstr_t)outpar;
char *pResult = (char *)bstrReturn;

// Print the result out:
printf("func=%s/n",pResult);

// Clean up:
SafeArrayDestroy(psa);

CoUninitialize();
return(0);
}

Answer 2

用web控件把网页加载起来，然后又再调用。无法凭空调用的