Added MacOS / Linux command line example

linux/examples/get_image/Makefile

@@ -0,0 +1,13 @@
+CFLAGS=-D__LINUX__ -c -Wall -O2 
+LIBS = -ltrmnl -L/opt/homebrew/opt/curl/lib -lcurl
+
+all: trmnl_demo
+
+trmnl_demo: main.o
+	$(CXX) main.o $(LIBS) -o trmnl_demo 
+
+main.o: main.cpp
+	$(CXX) $(CFLAGS) main.cpp
+
+clean:
+	rm -rf *.o demo

linux/examples/get_image/main.cpp

@@ -0,0 +1,53 @@
+#include <trmnl_lib.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+TRMNL trmnl;
+
+void showImage(const char *szDir, uint8_t *pImage, int iImageSize)
+{
+char szCMD[256], szName[256];
+FILE *f;
+
+    strcpy(szName, szDir);
+    if (szName[strlen(szName)-1] != '/') strcat(szName, "/");
+    strcat(szName, "temp_image.png");
+    f = fopen(szName, "w+b");
+    if (f) {
+        fwrite(pImage, iImageSize, 1, f);
+        fflush(f);
+        fclose(f);
+    } else {
+        printf("Error opening %s\n", szName);
+        return;
+    }
+    snprintf(szCMD, sizeof(szCMD), "open %s", szName);
+    system(szCMD);
+
+} /* showImage() */
+
+int main(int argc, char *argv[])
+{
+int rc;
+
+    uint8_t *pImage;
+    int iImageSize;
+
+    printf("Starting TRMNL demo\n");
+    if (argc != 3) {
+        printf("Usage: trmnl <API Key> <temp image dir>\n");
+        printf("Example: ./trmnl_demo abc_123 ~/home/Downloads\n");
+        return 0;
+    }
+    rc = trmnl.getAPI(argv[1]); // also reads and sends the sensor values if valid
+    if (rc == TRMNL_SUCCESS) {
+        printf("API request succeeded\n");
+        rc = trmnl.getImage(&pImage, &iImageSize);
+        if (rc == TRMNL_SUCCESS) {
+            printf("Image download succeeded (%d bytes)\n", iImageSize);
+            showImage(argv[2], pImage, iImageSize); // save and use "open" shell cmd
+            trmnl.freeImage();
+        }
+    }
+    return 0;
+} /* main() */

src/trmnl_lib.cpp

@@ -286,12 +286,12 @@ int rc = TRMNL_ERROR;
            * Do something nice with it!
            */
           
-          printf("%lu bytes retrieved\n", (unsigned long)chunk.size);
+          //printf("%lu bytes retrieved\n", (unsigned long)chunk.size);
           //    printf("%s\n", chunk.memory);
           // Parse the JSON
           pJSON = cJSON_ParseWithLength((const char *)chunk.memory, chunk.size);
           if (pJSON) {
-              printf("JSON parsed successfully!\n");
+              //printf("JSON parsed successfully!\n");
               if (cJSON_HasObjectItem(pJSON, "status")) {
                   pItem = cJSON_GetObjectItem(pJSON, "status");
                   _status = pItem->valueint;
@@ -306,7 +306,7 @@ int rc = TRMNL_ERROR;
               }
               if (_image_url.length() > 0) {
                   rc = TRMNL_SUCCESS;
-                  printf("Image URL: %s\n", _image_url.c_str());
+                  //printf("Image URL: %s\n", _image_url.c_str());
               }
           } // if pJSON
       } // successful GET request
@@ -448,7 +448,7 @@ int TRMNL::getImage(uint8_t **pBuffer, int *pSize)
              * Do something nice with it!
              */
        
-            printf("%lu bytes of image retrieved\n", (unsigned long)chunk.size);
+            //printf("%lu bytes of image retrieved\n", (unsigned long)chunk.size);
           }
        
           /* cleanup curl stuff */