C++ DLL 获取 MSI Property

// C-TEST.cpp : Defines the exported functions for the DLL application.
//

#include "stdafx.h"
#include <tchar.h>

UINT GetProperty(MSIHANDLE hInstall)
{
    TCHAR* szValueBuf = NULL;
    DWORD cchValueBuf = 0;
    UINT uiStat =  MsiGetProperty(hInstall, TEXT("ProductName"), TEXT(""), &cchValueBuf);
    //cchValueBuf now contains the size of the property‘s string, without null termination
    if (ERROR_MORE_DATA == uiStat)
    {
        ++cchValueBuf; // add 1 for null termination
        szValueBuf = new TCHAR[cchValueBuf];
        if (szValueBuf)
        {
            uiStat = MsiGetProperty(hInstall, TEXT("ProductName"), szValueBuf, &cchValueBuf);
        }
    }

    MessageBox(NULL, szValueBuf, _T("Im GetProperty"), MB_OK);

    if (ERROR_SUCCESS != uiStat)
    {
        if (szValueBuf != NULL) {
            delete[] szValueBuf;

        }
        return ERROR_INSTALL_FAILURE;
    }

    // custom action uses MyProperty
    // ...

    delete[] szValueBuf;

    return ERROR_SUCCESS;

}

UINT _stdcall SampleFunction2(LPCTSTR applicationName, MSIHANDLE hInstall)
{
    MessageBox(NULL, applicationName ,_T("I‘m Sample Function2‘s message"), MB_OK);
    return GetProperty(hInstall);
}