Unicode C

QR Code Generator via api.qrserver.com REST API

See more HTTP Examples

Demonstrates how to generate a QR code using the api.qrserver.com REST API service. Unicode C

#include <C_CkHttpW.h>
#include <C_CkJsonObjectW.h>
#include <C_CkHttpResponseW.h>
#include <C_CkBinDataW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkHttpW http;
    HCkJsonObjectW queryParams;
    HCkHttpResponseW resp;
    HCkBinDataW bd;

    success = FALSE;

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

    http = CkHttpW_Create();

    // Send the following GET request to get a binary response.
    // The body of the binary response contains the image data for the QR code.
    // https://api.qrserver.com/v1/create-qr-code/?data=[URL-encoded-text]&size=[pixels]x[pixels]

    queryParams = CkJsonObjectW_Create();
    CkJsonObjectW_UpdateString(queryParams,L"data",L"Hello World");
    CkJsonObjectW_UpdateString(queryParams,L"size",L"100x100");

    // Get a PNG file..
    // Possible formats are:
    // png
    // gif
    // jpeg
    // jpg
    // svg
    // eps
    // Case matters.  Use lowercase.
    CkJsonObjectW_UpdateString(queryParams,L"format",L"png");

    // Send the GET request to an endpoint.
    // Chilkat will add the url-encoded query params passed in the JSON.
    resp = CkHttpResponseW_Create();
    success = CkHttpW_HttpParams(http,L"GET",L"https://api.qrserver.com/v1/create-qr-code/",queryParams,resp);
    if (success == FALSE) {
        wprintf(L"%s\n",CkHttpW_lastErrorText(http));
        CkHttpW_Dispose(http);
        CkJsonObjectW_Dispose(queryParams);
        CkHttpResponseW_Dispose(resp);
        return;
    }

    // Did it succeed?
    if (CkHttpResponseW_getStatusCode(resp) != 200) {
        // The response body, if anything, would not be the image data, but would likely be the error text (or HTML, or whatever...)
        wprintf(L"%s\n",CkHttpResponseW_bodyStr(resp));
        wprintf(L"Response status = %d\n",CkHttpResponseW_getStatusCode(resp));
        wprintf(L"Failed.\n");
        CkHttpW_Dispose(http);
        CkJsonObjectW_Dispose(queryParams);
        CkHttpResponseW_Dispose(resp);
        return;
    }

    // Success if we get here..
    // Save the binary body as the PNG file, or you can get the bytes of the PNG..
    success = CkHttpResponseW_SaveBodyBinary(resp,L"c:/temp/qa_output/qr_code.png");

    // Or get the bytes:
    bd = CkBinDataW_Create();
    CkHttpResponseW_GetBodyBd(resp,bd);
    // Use the bytes in bd...
    // See the online reference documentation for the function to access the bytes directly.

    wprintf(L"Success.\n");


    CkHttpW_Dispose(http);
    CkJsonObjectW_Dispose(queryParams);
    CkHttpResponseW_Dispose(resp);
    CkBinDataW_Dispose(bd);

    }