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. C

#include <C_CkHttp.h>
#include <C_CkJsonObject.h>
#include <C_CkHttpResponse.h>
#include <C_CkBinData.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkHttp http;
    HCkJsonObject queryParams;
    HCkHttpResponse resp;
    HCkBinData bd;

    success = FALSE;

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

    http = CkHttp_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 = CkJsonObject_Create();
    CkJsonObject_UpdateString(queryParams,"data","Hello World");
    CkJsonObject_UpdateString(queryParams,"size","100x100");

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

    // Send the GET request to an endpoint.
    // Chilkat will add the url-encoded query params passed in the JSON.
    resp = CkHttpResponse_Create();
    success = CkHttp_HttpParams(http,"GET","https://api.qrserver.com/v1/create-qr-code/",queryParams,resp);
    if (success == FALSE) {
        printf("%s\n",CkHttp_lastErrorText(http));
        CkHttp_Dispose(http);
        CkJsonObject_Dispose(queryParams);
        CkHttpResponse_Dispose(resp);
        return;
    }

    // Did it succeed?
    if (CkHttpResponse_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...)
        printf("%s\n",CkHttpResponse_bodyStr(resp));
        printf("Response status = %d\n",CkHttpResponse_getStatusCode(resp));
        printf("Failed.\n");
        CkHttp_Dispose(http);
        CkJsonObject_Dispose(queryParams);
        CkHttpResponse_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 = CkHttpResponse_SaveBodyBinary(resp,"c:/temp/qa_output/qr_code.png");

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

    printf("Success.\n");


    CkHttp_Dispose(http);
    CkJsonObject_Dispose(queryParams);
    CkHttpResponse_Dispose(resp);
    CkBinData_Dispose(bd);

    }