跨文件使用变量

Core/Inc/cJSON_Test.h

@@ -4,7 +4,14 @@
 #include "cJSON.h"
 #ifndef H750_CJSON_CJSON_TEST_H
 #define H750_CJSON_CJSON_TEST_H
+struct paramstruct {
+    int age;
+    float height;
+};
 //void cjson(const char * g_usart_json_string);
 void cjson(uint8_t g_usart_json_string[]);
 void parseNestedObject(cJSON *nestedObject);
+int Change_Age();
+struct paramstruct *GetParametesptr();
+void SV_Change_Age();
 #endif //H750_CJSON_CJSON_TEST_H

Core/Src/cJSON_Test.c

@@ -1,6 +1,7 @@
 
 #include <stdio.h>
 #include "cJSON_Test.h"
+struct paramstruct Parameters;
 
 void cjson(uint8_t g_usart_json_string[])
 {
@@ -14,15 +15,20 @@ void cjson(uint8_t g_usart_json_string[])
         cJSON *city = cJSON_GetObjectItem(json, "city");
         cJSON *waihao = cJSON_GetObjectItem(json, "waihao");
         if (name != NULL && age != NULL && city != NULL&& waihao != NULL) {
-    // 打印解析结果
-        printf("Name: %s\n", name->valuestring);
-        printf("Age: %d\n", age->valueint);
-        printf("City: %s\n", city->valuestring);
-        // 解析嵌套的对象
-        printf("Waihao:\n");
-        parseNestedObject(waihao);
+            // 打印解析结果
+            printf("Name: %s\n", name->valuestring);
+            printf("Age:  %d\n", age ->valueint);
+            printf("City: %s\n", city->valuestring);
+            // 解析嵌套的对象
+            printf("Waihao:\n");
+            parseNestedObject(waihao);
+            Parameters.age= age->valueint;
+            Parameters.height=age->valueint;
         }
 
+
+
+
 // 释放 cJSON 对象
         cJSON_Delete(json);
     } else {
@@ -39,4 +45,9 @@ void parseNestedObject(cJSON *nestedObject) {
         printf("  waihao1: %s\n", waihao1->valuestring);
         printf("  waihao2: %s\n", waihao2->valuestring);
     }
+}
+
+struct paramstruct *GetParametesptr()
+{
+    return &Parameters;
 }

Core/Src/main.c

@@ -73,7 +73,7 @@ static void MPU_Config(void);
 int main(void)
 {
   /* USER CODE BEGIN 1 */
-    uint8_t len;
+    int age;
 
   /* USER CODE END 1 */
 
@@ -108,7 +108,7 @@ int main(void)
   /* USER CODE BEGIN 2 */
     RetargetInit(&huart1);
 
-    int value;
+
   /* USER CODE END 2 */
 
   /* Infinite loop */
@@ -118,10 +118,13 @@ int main(void)
     /* USER CODE END WHILE */
 
     /* USER CODE BEGIN 3 */
+    struct paramstruct *paramstruct;
+    paramstruct = GetParametesptr();
+    paramstruct->age=20;
 
-
-      SerialDataProcess();
-
+    SerialDataProcess();
+    age= Change_Age();
+    printf("Age is %d\r\n",age);
 //      printf("Hello World\r\n");
   }
   /* USER CODE END 3 */