我写了一段代码 本意是想获取用Windows Installer安装的程序的相关信息。但是它却无法工作~

Question

我写了一段代码 本意是想获取用Windows Installer安装的程序的相关信息，比如获取UninstallString和类似NoRemove、NoModify、NoRepair属性，有哪位高人来指点一下？

typedef enum ITEM_COMEFROM_tag
{
	FROM_MSI, 
	FROM_HKLM, 
	FROM_HKCU
}ITEM_COMEFROM;

typedef struct SOFTITEM_tag
{
	CString szSoftName;
	CString szClassID;
	CString szUninstallString;
	CString szRegKey;
	BOOL bNoModify;
	BOOL bNoRemove;
	BOOL bNoRepair;
	BOOL IsHotFix;
	ITEM_COMEFROM iComeFrom;
}SOFTITEM;

typedef std::vector<SOFTITEM> TSOFTLIST;

TSOFTLIST m_SoftList;

void CCollectUninstallDlg::GetMsiItem()
{
	wchar_t wsProductCode[39] = {0};
	DWORD iIndex = 0;
	DWORD dwContext = MSIINSTALLCONTEXT_USERMANAGED | MSIINSTALLCONTEXT_USERUNMANAGED | MSIINSTALLCONTEXT_MACHINE;
	HRESULT dwRet = MsiEnumProductsEx(NULL, NULL, dwContext, iIndex, wsProductCode, NULL, NULL, NULL );

	while (ERROR_SUCCESS == dwRet)
	{
		SOFTITEM Info;
		wchar_t wsVaule[MAX_PATH] = {0};
		DWORD dwNeedSize = MAX_PATH;

		if (ERROR_SUCCESS == MsiGetProductInfoW(wsProductCode, INSTALLPROPERTY_PRODUCTNAME, wsVaule, &dwNeedSize))
		{
			Info.szSoftName = wsVaule;
			Info.szClassID = wsProductCode;
			Info.iComeFrom = FROM_MSI;
			Info.IsHotFix = FALSE;
			Info.bNoModify = FALSE;
			Info.bNoRemove = FALSE;
			Info.bNoRepair = FALSE;

			dwNeedSize = MAX_PATH;
			ZeroMemory(wsVaule, MAX_PATH);
			if (ERROR_SUCCESS == MsiGetProductInfo(wsProductCode, L"NoModify", wsVaule, &dwNeedSize))
			{
				if (wsVaule == L"1")
				{
					Info.bNoModify = TRUE;
				}
			}

			dwNeedSize = MAX_PATH;
			if (ERROR_SUCCESS == MsiGetProductInfo(wsProductCode, L"NoRemove", wsVaule, &dwNeedSize))
			{
				if (wsVaule == L"1")
				{
					Info.bNoRemove = TRUE;
				}
			}

			dwNeedSize = MAX_PATH;
			if (ERROR_SUCCESS == MsiGetProductInfo(wsProductCode, L"NoRepair", wsVaule, &dwNeedSize))
			{
				if (wsVaule == L"1")
				{
					Info.bNoRepair = TRUE;
				}
			}

			dwNeedSize = MAX_PATH;
			if (ERROR_SUCCESS == MsiGetProductInfo(wsProductCode, L"UninstallString", wsVaule, &dwNeedSize))
			{
					Info.szUninstallString = wsVaule;
			}
			

			m_SoftList.push_back(Info);

		}

		iIndex++;
		dwRet = MsiEnumProductsEx(NULL, NULL, dwContext, iIndex, wsProductCode, NULL, NULL, NULL );
	}
}

本以为使用MsiGetProductInfo(wsProductCode, L"NoModify", wsVaule, &dwNeedSize)这种方法能够得偿所愿，但是发现，执行到这一句的时候，返回的是S_OK，但是wsVaule中却还是NULL而不是注册表中所记录的1或者0~

Answer 1

发现返回1608错误~ 未知的属性！~  难道非得亲自去读注册表~