(Unicode C) Conversation with Streaming Responses

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Note: This example requires Chilkat v11.2.0 or greater.

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#include <C_CkAiW.h>
#include <C_CkStringBuilderW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkAiW ai;
    const wchar_t *systemMsg;
    const wchar_t *developerMsg;
    const wchar_t *conversationName;
    HCkStringBuilderW sbEventName;
    HCkStringBuilderW sbDelta;
    HCkStringBuilderW sbFullResponse;
    BOOL finished;
    BOOL abortFlag;
    int maxWaitMs;
    int result;
    int result;

    success = FALSE;

    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    ai = CkAiW_Create();

    // The provider can be "openai", "google", "claude", "deepseek", "xai", or "perplexity".
    // Support for additional providers will be added in future versions of Chilkat.
    CkAiW_putProvider(ai,L"google");

    // Use your provider's API key.
    CkAiW_putApiKey(ai,L"MY_API_KEY");

    // Choose a model.
    CkAiW_putModel(ai,L"gemini-2.5-flash");

    // Indicate streaming mode is to be used.
    CkAiW_putStreaming(ai,TRUE);

    // Create a new conversation to be maintained locally in memory.
    // If the conversation is the first to be created, it is also automatically selected.
    systemMsg = L"You are a creative storyteller";
    developerMsg = L"";
    conversationName = L"test_conversation";
    CkAiW_NewConvo(ai,conversationName,systemMsg,developerMsg);

    // Add a text input.
    CkAiW_InputAddText(ai,L"Write a detailed story about a turtle who decides to run a bakery.  Describe the setting, the kinds of pastries, how the turtle feels, and include at least three paragraphs.");

    // Ask the AI for text output.
    success = CkAiW_Ask(ai,L"text");
    if (success == FALSE) {
        wprintf(L"%s\n",CkAiW_lastErrorText(ai));
        CkAiW_Dispose(ai);
        return;
    }

    sbEventName = CkStringBuilderW_Create();
    sbDelta = CkStringBuilderW_Create();
    sbFullResponse = CkStringBuilderW_Create();
    finished = FALSE;
    abortFlag = FALSE;
    maxWaitMs = 5000;

    while (!finished) {

        result = CkAiW_PollAi(ai,abortFlag);
        if (result == 1) {
            // We have output waiting.  It should be instantly available.  The maxWaitMs is just-in-case.
            success = CkAiW_NextAiEvent(ai,maxWaitMs,sbEventName,sbDelta);
            if (success == FALSE) {
                wprintf(L"%s\n",CkAiW_lastErrorText(ai));
                CkAiW_Dispose(ai);
                CkStringBuilderW_Dispose(sbEventName);
                CkStringBuilderW_Dispose(sbDelta);
                CkStringBuilderW_Dispose(sbFullResponse);
                return;
            }

            // Some AI providers send many "empty" events.  Just ignore them.
            if (!CkStringBuilderW_ContentsEqual(sbEventName,L"empty",TRUE)) {

                // The delta contains the new output.  This could be emitted to a display or the terminal
                // as real-time output.
                if (CkStringBuilderW_ContentsEqual(sbEventName,L"delta",TRUE)) {
                    // This example will emit each delta to its own line.
                    wprintf(L"%s\n",CkStringBuilderW_getAsString(sbDelta));

                    // Accumulate the delta's so we can show the full response later.
                    CkStringBuilderW_AppendSb(sbFullResponse,sbDelta);
                }
                else {
                    // A streaming AI response is always terminated by a single "null_terminator" event.
                    finished = CkStringBuilderW_ContentsEqual(sbEventName,L"null_terminator",TRUE);
                }

            }

        }
        else {
            if (result == 0) {
                // Nothing is immediately available. Sleep for 1/10 of a second before polling again.
                CkAiW_SleepMs(ai,100);
            }
            else {
                // Something failed..
                wprintf(L"%s\n",CkAiW_lastErrorText(ai));
                finished = TRUE;
            }

        }

    }

    // -------------------------------------------------------------
    // The response is in markdown format.
    // Also see Markdown to HTML Conversion Examples.
    // -------------------------------------------------------------

    // Show the accumulated (full) response.
    wprintf(L"----\n");
    wprintf(L"%s\n",CkStringBuilderW_getAsString(sbFullResponse));
    wprintf(L"----\n");

    // ----------------------------------------------------------------------------------------------------------
    // For the 2nd request in this conversation, ask for a shorter version of the story.
    CkAiW_InputAddText(ai,L"Rewrite the story, but this time make it shorter, about one third as long.");
    success = CkAiW_Ask(ai,L"text");
    if (success == FALSE) {
        wprintf(L"%s\n",CkAiW_lastErrorText(ai));
        CkAiW_Dispose(ai);
        CkStringBuilderW_Dispose(sbEventName);
        CkStringBuilderW_Dispose(sbDelta);
        CkStringBuilderW_Dispose(sbFullResponse);
        return;
    }

    CkStringBuilderW_Clear(sbFullResponse);
    finished = FALSE;

    while (!finished) {

        result = CkAiW_PollAi(ai,abortFlag);
        if (result == 1) {
            // We have output waiting.  It should be instantly available.  The maxWaitMs is just-in-case.
            success = CkAiW_NextAiEvent(ai,maxWaitMs,sbEventName,sbDelta);
            if (success == FALSE) {
                wprintf(L"%s\n",CkAiW_lastErrorText(ai));
                CkAiW_Dispose(ai);
                CkStringBuilderW_Dispose(sbEventName);
                CkStringBuilderW_Dispose(sbDelta);
                CkStringBuilderW_Dispose(sbFullResponse);
                return;
            }

            // Some AI providers send many "empty" events.  Just ignore them.
            if (!CkStringBuilderW_ContentsEqual(sbEventName,L"empty",TRUE)) {

                // The delta contains the new output.  This could be emitted to a display or the terminal
                // as real-time output.
                if (CkStringBuilderW_ContentsEqual(sbEventName,L"delta",TRUE)) {
                    // This example will emit each delta to its own line.
                    wprintf(L"%s\n",CkStringBuilderW_getAsString(sbDelta));

                    // Accumulate the delta's so we can show the full response later.
                    CkStringBuilderW_AppendSb(sbFullResponse,sbDelta);
                }
                else {
                    // A streaming AI response is always terminated by a single "null_terminator" event.
                    finished = CkStringBuilderW_ContentsEqual(sbEventName,L"null_terminator",TRUE);
                }

            }

        }
        else {
            if (result == 0) {
                // Nothing is immediately available. Sleep for 1/10 of a second before polling again.
                CkAiW_SleepMs(ai,100);
            }
            else {
                // Something failed..
                wprintf(L"%s\n",CkAiW_lastErrorText(ai));
                finished = TRUE;
            }

        }

    }

    wprintf(L"----\n");
    wprintf(L"%s\n",CkStringBuilderW_getAsString(sbFullResponse));


    CkAiW_Dispose(ai);
    CkStringBuilderW_Dispose(sbEventName);
    CkStringBuilderW_Dispose(sbDelta);
    CkStringBuilderW_Dispose(sbFullResponse);

    }