C語言是一種廣泛應用的編程語言，可以用于開發各種應用程序，包括圖像處理軟件。JSON（JavaScript對象表示法）則是一種輕量級的數據格式，具有廣泛的應用領域。本文將介紹如何使用C語言處理圖像數據并將其轉換為JSON格式。

#include#include#include#include#include#include#include// 讀取JPEG圖像文件并將數據轉換為JSON格式
int main(int argc, char **argv) {
// 讀取JPEG圖像文件數據
FILE *infile;
struct jpeg_decompress_struct cinfo;
struct jpeg_error_mgr jerr;
unsigned char *image_data;
int line_width, row_stride, image_size;
infile = fopen("test.jpg", "rb");
if (infile == NULL) {
fprintf(stderr, "Can't open jpeg file\n");
exit(1);
}
cinfo.err = jpeg_std_error(&jerr);
jpeg_create_decompress(&cinfo);
jpeg_stdio_src(&cinfo, infile);
jpeg_read_header(&cinfo, TRUE);
jpeg_start_decompress(&cinfo);
line_width = cinfo.output_width * cinfo.output_components;
row_stride = line_width;
image_size = cinfo.output_height * row_stride;
image_data = malloc(image_size);
JSAMPARRAY buffer = (*cinfo.mem->alloc_sarray)
((j_common_ptr) &cinfo, JPOOL_IMAGE, line_width, 1);
unsigned char *p_image_data = image_data;
while (cinfo.output_scanline< cinfo.output_height) {
jpeg_read_scanlines(&cinfo, buffer, 1);
memcpy(p_image_data, buffer[0], row_stride);
p_image_data += row_stride;
}
jpeg_finish_decompress(&cinfo);
jpeg_destroy_decompress(&cinfo);
fclose(infile);
// 將圖像數據轉換為JSON格式
cJSON *root = cJSON_CreateObject();
cJSON_AddNumberToObject(root, "width", cinfo.output_width);
cJSON_AddNumberToObject(root, "height", cinfo.output_height);
cJSON_AddNumberToObject(root, "channels", cinfo.output_components);
cJSON_AddNumberToObject(root, "size", image_size);
cJSON *data_array = cJSON_CreateArray();
for (int i = 0; i< image_size; ++i) {
cJSON_AddItemToArray(data_array, cJSON_CreateNumber(image_data[i]));
}
cJSON_AddItemToObject(root, "data", data_array);
char *json_str = cJSON_Print(root);
printf("%s\n", json_str);
// 釋放內存
free(image_data);
free(json_str);
cJSON_Delete(root);
return 0;
}

上述代碼使用了libjpeg庫讀取JPEG圖像文件的數據，然后使用cJSON庫將圖像數據轉換為JSON格式，最終打印出JSON字符串。通過這種方式可以輕松地將圖像數據存儲到數據庫或發送到網絡，方便圖像數據的傳輸和處理。