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Get the Last JSON-RPC Response from an MCP Server
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Demonstrates Mcp.GetLastJsonData, which returns the complete JSON-RPC response envelope (the jsonrpc, id, and result members) from the most recent request into a JsonObject.
Tip: Code to parse the returned JSON can be generated with Chilkat's online tool at https://tools.chilkat.io/jsonParse.
Background. This exposes the full protocol-level response for inspection or debugging after any MCP request.
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#include <CkMcpW.h>
#include <CkJsonObjectW.h>
void ChilkatSample(void)
{
bool success = false;
CkMcpW mcp;
// Connect to a public MCP (Model Context Protocol) server over its Streamable HTTP endpoint. The
// Microsoft Learn MCP server is public and requires no authentication.
success = mcp.Connect(L"https://learn.microsoft.com/api/mcp");
if (success == false) {
wprintf(L"%s\n",mcp.lastErrorText());
return;
}
// Perform an MCP request.
CkJsonObjectW toolsResult;
success = mcp.ListTools(toolsResult);
if (success == false) {
wprintf(L"%s\n",mcp.lastErrorText());
return;
}
// Get the complete JSON-RPC response envelope (the jsonrpc, id, and result members) from the most
// recent request.
CkJsonObjectW json;
mcp.GetLastJsonData(json);
json.put_EmitCompact(false);
wprintf(L"%s\n",json.emit());
// JSON parsing code for this result can be generated at Chilkat's online tool:
// https://tools.chilkat.io/jsonParse
}