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How To Call Run() Method of the Microsoft Script Control in C++

Article ID: 229669

This article was previously published under Q229669

Summary

This article demonstrates how to use the Microsoft Script control to call functions or subroutines defined in JavaScript or VBScript.

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The Script control has four methods. One of them is Run(), which runs a subroutine or a function. Before you call this method, specify the language of the script, set AllowUI, and add the following script to the script control:

//---------------------- 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);
}

// --------------- End -----------------------

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