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Unicode C
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 <C_CkMcpW.h>
#include <C_CkJsonObjectW.h>
void ChilkatSample(void)
{
BOOL success;
HCkMcpW mcp;
HCkJsonObjectW toolsResult;
HCkJsonObjectW json;
success = FALSE;
mcp = CkMcpW_Create();
// 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 = CkMcpW_Connect(mcp,L"https://learn.microsoft.com/api/mcp");
if (success == FALSE) {
wprintf(L"%s\n",CkMcpW_lastErrorText(mcp));
CkMcpW_Dispose(mcp);
return;
}
// Perform an MCP request.
toolsResult = CkJsonObjectW_Create();
success = CkMcpW_ListTools(mcp,toolsResult);
if (success == FALSE) {
wprintf(L"%s\n",CkMcpW_lastErrorText(mcp));
CkMcpW_Dispose(mcp);
CkJsonObjectW_Dispose(toolsResult);
return;
}
// Get the complete JSON-RPC response envelope (the jsonrpc, id, and result members) from the most
// recent request.
json = CkJsonObjectW_Create();
CkMcpW_GetLastJsonData(mcp,json);
CkJsonObjectW_putEmitCompact(json,FALSE);
wprintf(L"%s\n",CkJsonObjectW_emit(json));
// JSON parsing code for this result can be generated at Chilkat's online tool:
// https://tools.chilkat.io/jsonParse
CkMcpW_Dispose(mcp);
CkJsonObjectW_Dispose(toolsResult);
CkJsonObjectW_Dispose(json);
}