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最新推荐文章于 2025-02-10 20:25:18 发布

taotf

最新推荐文章于 2025-02-10 20:25:18 发布

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文章标签： c语言 http 物联网

本文链接：https://blog.youkuaiyun.com/taotf/article/details/128299832

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记录如何在esp32上使用http post multipart/form-data类型数据（二）

上次发送了一个文本文件，这次研究一下如何发送图片。

先用wireshark中抓包查看postman是如何发送数据的

1、老规矩，先在postman中发送一次

在这里插入图片描述

其中ciphertext为加密后base64编码数据，file是一个txt文件内容是456

2、Wireshark抓包如下图：

整体的formdata如下所示
在这里插入图片描述
文本的Content-Type是 Content-Type：text/plain
图片的是 Content-Type：image/jpeg

3、esp32实现过程

根据以上抓包可以看到如何设置Content-Type和body内容。

3.1、设置Content-Type时加上boundary（边界）

在esp32中，代码如下：

//set Content-Type:multipart/form-data
esp_http_client_set_header(client, "Content-Type",  "multipart/form-data; boundary=--------------------------380152821047278044815818\r\n");

3.2、formdata的内容

在postman中只有两段
在这里插入图片描述

ciphertext对应的数据是加密后base64编码数据Sfo4LaU/lXK0PPwvC6AtUg4NW7D2C07znPDrOP88vcun86abTD+qV/yp+rO3MvPIzWNrKm3NVzybtpzuqZtmVhFlvwgAF4rWSkcov/9maEQ=
file对应的数据是一个123.jpg文件

esp32中需要以下内容描述

--------------------------380152821047278044815818\r\n
Content-Disposition: form-data; name="ciphertext"\r\n\r\n
Sfo4LaU/lXK0PPwvC6AtUg4NW7D2C07znPDrOP88vcun86abTD+qV/yp+rO3MvPIzWNrKm3NVzybtpzuqZtmVhFlvwgAF4rWSkcov/9maEQ=\r\n
--------------------------380152821047278044815818\r\n
Content-Disposition: form-data; name="file"; filename="123.jpg"\r\n
Content-Type: image/jpeg\r\n\r\n
图片二进制数据流\r\n
--------------------------380152821047278044815818--\r\n

4、esp32的代码实现

将3.2节formdata的内容转十六进制，如下

     char post_data1[3000]={
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			0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x33,0x38,0x30,0x31,0x35,0x32,0x38,0x32,0x31,0x30,0x34,0x37,0x32,0x37,0x38,0x30,0x34,0x34,0x38,0x31,0x35,0x38,0x31,0x38,0x2d,0x2d,0x0d,0x0a
    };

post_data1的内容就是body，然后调用esp_http_client_set_post_field设置body：

esp_http_client_set_post_field(client, post_data1, strlen(post_data1));

最后在贴一下整体的代码

void http_test_form_data()
{

	esp_http_client_config_t config = {
			.url = "http://****************/timely/cateye/log/device-active",
			.event_handler = _http_event_handler,
	};
    esp_http_client_handle_t client = esp_http_client_init(&config);
    esp_http_client_set_header(client, "deviceId", "Slock383B26942336\r\n");
    esp_http_client_set_method(client, HTTP_METHOD_POST);
    esp_http_client_set_header(client, "Content-Type",  "multipart/form-data; boundary=--------------------------380152821047278044815818\r\n");

    char post_data1[3000]={
    		0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x33,0x38,0x30,0x31,0x35,0x32,0x38,0x32,0x31,0x30,0x34,0x37,0x32,0x37,0x38,0x30,0x34,0x34,0x38,0x31,0x35,0x38,0x31,0x38,0x0d,0x0a,
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			0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x2d,0x33,0x38,0x30,0x31,0x35,0x32,0x38,0x32,0x31,0x30,0x34,0x37,0x32,0x37,0x38,0x30,0x34,0x34,0x38,0x31,0x35,0x38,0x31,0x38,0x2d,0x2d,0x0d,0x0a
    };
    esp_http_client_set_post_field(client, post_data1, 2814);
    esp_err_t err  = esp_http_client_perform(client);
    if (err == ESP_OK) {
            ESP_LOGI(TAG, "HTTP POST Status = %d, content_length = %d",
                    esp_http_client_get_status_code(client),
                    esp_http_client_get_content_length(client));
        } else {
            ESP_LOGE(TAG, "HTTP POST request failed: %s", esp_err_to_name(err));
        }
    esp_http_client_cleanup(client);
}