IsNull

如果 CDocBuilderValue 对象为 null，则返回 true。

备注

此方法不适用于 JS。

语法

Python

def IsNull(self) -> bool

C++

bool IsNull();

COM

HRESULT IsNull([out, retval] VARIANT_BOOL* result);

Java

boolean isNull();

.Net

bool IsNull();

参数

Python

此方法没有参数。

C++

此方法没有参数。

COM

名称	类型	描述
result	VARIANT_BOOL*	指定 CDocBuilderValue 对象是否为 null。

Java

此方法没有参数。

.Net

此方法没有参数。

示例

Python

builder = docbuilder.CDocBuilder()
context = builder.GetContext()
globalObj = context.GetGlobal()
bNull = globalObj.IsNull()

C++

std::wstring sWorkDirectory = NSUtils::GetBuilderDirectory();
CDocBuilder::Initialize(sWorkDirectory.c_str());
CDocBuilder oBuilder;
CContext oContext = oBuilder.GetContext();
CValue oGlobal = oContext.GetGlobal();
bool bNull = oGlobal.IsNull();
CDocBuilder::Dispose();

COM

CoInitialize(NULL);
IONLYOFFICEDocBuilder* oBuilder = NULL;
CoCreateInstance(__uuidof(CONLYOFFICEDocBuilder), NULL, CLSCTX_INPROC_SERVER, __uuidof(IONLYOFFICEDocBuilder), (void**)&oBuilder);
IONLYOFFICEDocBuilderContext* oContext = NULL;
IONLYOFFICEDocBuilderValue* oGlobal = NULL;
VARIANT_BOOL b;
oBuilder->Initialize();
oBuilder->GetContext(&oContext);
oContext->GetGlobal(&oGlobal);
oGlobal->IsNull(&b);
oBuilder->Dispose();

Java

CDocBuilder.initialize("");
CDocBuilder builder = new CDocBuilder();
CDocBuilderContext context = builder.getContext();
CDocBuilderValue global = context.getGlobal();
boolean bNull = global.isNull();
CDocBuilder.dispose();

.Net

string workDirectory = "C:/Program Files/ONLYOFFICE/documentBuilder";
CDocBuilder.Initialize(workDirectory);
CDocBuilder oBuilder = new CDocBuilder();
CContext oContext = oBuilder.GetContext();
CValue oGlobal = oContext.GetGlobal();
bool bNull = oGlobal.IsNull();
CDocBuilder.Destroy();