我检查了WiX Github,看起来像今天这是不可能的。一旦您在BURN中定义了MsiProperty,该值就会被设置并传递给MSI,而不管该值是否为空。下面是代码的快照:
extern "C" HRESULT MsiEngineParsePropertiesFromXml(
__in IXMLDOMNode* pixnPackage,
__out BURN_MSIPROPERTY** prgProperties,
__out DWORD* pcProperties
)
{
HRESULT hr = S_OK;
IXMLDOMNodeList* pixnNodes = NULL;
IXMLDOMNode* pixnNode = NULL;
DWORD cNodes = 0;
BURN_MSIPROPERTY* pProperties = NULL;
// select property nodes
hr = XmlSelectNodes(pixnPackage, L"MsiProperty", &pixnNodes);
ExitOnFailure(hr, "Failed to select property nodes.");
// get property node count
hr = pixnNodes->get_length((long*)&cNodes);
ExitOnFailure(hr, "Failed to get property node count.");
if (cNodes)
{
// allocate memory for properties
pProperties = (BURN_MSIPROPERTY*)MemAlloc(sizeof(BURN_MSIPROPERTY) * cNodes, TRUE);
ExitOnNull(pProperties, hr, E_OUTOFMEMORY, "Failed to allocate memory for MSI property structs.");
// parse property elements
for (DWORD i = 0; i < cNodes; ++i)
{
BURN_MSIPROPERTY* pProperty = &pProperties[i];
hr = XmlNextElement(pixnNodes, &pixnNode, NULL);
ExitOnFailure(hr, "Failed to get next node.");
// @Id
hr = XmlGetAttributeEx(pixnNode, L"Id", &pProperty->sczId);
ExitOnFailure(hr, "Failed to get @Id.");
// @Value
hr = XmlGetAttributeEx(pixnNode, L"Value", &pProperty->sczValue);
ExitOnFailure(hr, "Failed to get @Value.");
// @RollbackValue
hr = XmlGetAttributeEx(pixnNode, L"RollbackValue", &pProperty->sczRollbackValue);
if (E_NOTFOUND != hr)
{
ExitOnFailure(hr, "Failed to get @RollbackValue.");
}
// prepare next iteration
ReleaseNullObject(pixnNode);
}
}
看起来这将是WiX4.0一个新的功能提到HERE
现在这样说,如果你是MSI的作者,那么你可以检查MSI(.wxs)文件中的属性值,如果它使用SetProperty出现“空”,则将其设置为不同的值。
这是否有帮助????? – Isaiah4110