BC660 QuecOpen Error formatting a negative number with cJSON

Technical Subjects Open Solution
1

I create a structure with negative numbers

cJSON* t = cJSON_CreateObject();
cJSON* i = cJSON_CreateObject();
cJSON_AddNumberToObject (t, “n1”, -75);
cJSON_AddNumberToObject (t, “n2”, (float)-75);
cJSON_AddNumberToObject (i, “n3”, -75);
cJSON_AddItemToObject (t, “test”, i);

output_1
char *ch = cJSON_PrintUnformatted(t);
APP_DEBUG("%s\r\n", ch);
result_1
{“n1”:-7.5ð0000000000E1,"n2":-7.5ð0000000000E1,“test”:{“n3”:-7.5`ð0000000000E1}}

output_2
cJSON tst = cJSON_Parse(ch);
APP_DEBUG("%f\r\n", cJSON_GetObjectItem(tst, “n1”)->valuedouble);
APP_DEBUG("%f\r\n", cJSON_GetObjectItem(tst, “n2”)->valuedouble);
cJSON json_node = cJSON_GetObjectItem(tst, “test”);
cJSON* json_item = cJSON_GetObjectItem(json_node, “n3”);
APP_DEBUG("%f\r\n", json_item->valuedouble);
result_2
0.000000
0.000000
0.000000

What is my mistake?

2

Dear YuS

What is the specific SDK version you use?Did you port the cJson part of the code yourself?

3

BC660K-GL_QuecOpen_NB5_SDK_V1.0_BETA0628A
cJSON built in SDK.

P.S. I created a library for the latest version of json, but got a project compilation error due to incompatibility with other libraries.

4

Dear YuS

Please refer to the Quectel_OpenCPU_Quick_Start_Application_Note documentation in the SDK package to learn how to add personal C code to the project.

5

Hi

I can’t replace just the cJSON library, I have no problems adding my own code.
Can you give me a link to download the latest SDK for BC 660?

Best regard
YuS

6

Dear YuS

The SDK package needs to connect with the sales representative in your area to apply, which we don’t have either.Thank you.