如何在 C++ 中使用 Google 的 Protocol Buffer 添加重复字段？
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How do you add a repeated field using Google's Protocol Buffer in C++?
提问by aajkaltak
I have the below protocol buffer. Note that StockStatic is a repeated field.
我有以下协议缓冲区。请注意， StockStatic 是一个重复字段。
message ServiceResponse
{
enum Type
{
REQUEST_FAILED = 1;
STOCK_STATIC_SNAPSHOT = 2;
}
message StockStaticSnapshot
{
repeated StockStatic stock_static = 1;
}
required Type type = 1;
optional StockStaticSnapshot stock_static_snapshot = 2;
}
message StockStatic
{
optional string sector = 1;
optional string subsector = 2;
}
I am filling out the StockStatic fields while iterating through a vector.
我在遍历向量时填写 StockStatic 字段。
ServiceResponse.set_type(ServiceResponse_Type_STOCK_STATIC_SNAPSHOT);
ServiceResponse_StockStaticSnapshot stockStaticSnapshot;
for (vector<stockStaticInfo>::iterator it = m_staticStocks.begin(); it!= m_staticStocks.end(); ++it)
{
StockStatic* pStockStaticEntity = stockStaticSnapshot.add_stock_static();
SetStockStaticProtoFields(*it, pStockStaticEntity); // sets sector and subsector field to pStockStaticEntity by reading the fields using (*it)
}
But the above code is right only if StockStatic was an optional field and not a repeated field. My questions is what line of code am i missing to make it a repeated field?
但是只有当 StockStatic 是可选字段而不是重复字段时，上面的代码才是正确的。我的问题是我缺少哪行代码才能使其成为重复字段？
回答by leegent
No, you're doing the right thing.
不，你在做正确的事。
Here's a snippet of my protocol buffer (details omitted for brevity):
这是我的协议缓冲区的片段（为简洁起见省略了详细信息）：
message DemandSummary
{
required uint32 solutionIndex = 1;
required uint32 demandID = 2;
}
message ComputeResponse
{
repeated DemandSummary solutionInfo = 3;
}
...and the C++ to fill up ComputeResponse::solutionInfo:
...和 C++ 来填充 ComputeResponse::solutionInfo：
ComputeResponse response;
for ( int i = 0; i < demList.size(); ++i ) {
DemandSummary* summary = response->add_solutioninfo();
summary->set_solutionindex(solutionID);
summary->set_demandid(demList[i].toUInt());
}
response.solutionInfonow contains demList.size()elements.
response.solutionInfo现在包含demList.size()元素。
回答by VNarasimhaM
Another way of accomplishing the same thing:
完成同样事情的另一种方式：
message SearchResponse {
message Result {
required string url = 1;
optional string title = 2;
repeated string snippets = 3;
}
repeated Result result = 1;
}
