简介

本文针对官方例程中的第一个例程：single-acquisition做简单的讲解，并简单分析其中调用的arv_camera_new ，arv_camera_acquisition，arv_camera_get_model_name ，arv_buffer_get_image_width ，arv_buffer_get_image_height 函数。

aravis版本：0.8.31
操作系统：ubuntu-20.04
gcc版本：9.4.0

源码

/* SPDX-License-Identifier:Unlicense */

/* Aravis header */

#include <arv.h>

/* Standard headers */

#include <stdlib.h>
#include <stdio.h>

/*
 * Connect to the first available camera, then acquire a single buffer.
 */

int main (int argc, char **argv)
{
	ArvCamera *camera;
	ArvBuffer *buffer;
	GError *error = NULL;

	/* Connect to the first available camera */
	camera = arv_camera_new (NULL, &error);
    //camera = arv_camera_new ("192.168.6.23", &error);

	if (ARV_IS_CAMERA (camera)) {
		printf ("Found camera '%s'\n", arv_camera_get_model_name (camera, NULL));

		/* Acquire a single buffer */
		buffer = arv_camera_acquisition (camera, 0, &error);

		if (ARV_IS_BUFFER (buffer)) {
			/* Display some informations about the retrieved buffer */
			printf ("Acquired %d×%d buffer\n",
				arv_buffer_get_image_width (buffer),
				arv_buffer_get_image_height (buffer));
			/* Destroy the buffer */
			g_clear_object (&buffer);
		}

		/* Destroy the camera instance */
		g_clear_object (&camera);
	}

	if (error != NULL) {
		/* An error happened, display the correspdonding message */
		printf ("Error: %s\n", error->message);
		return EXIT_FAILURE;
	}

	return EXIT_SUCCESS;
}

此例程较为简单，每一步的细节查看注释即可，此处不过多讲解。
运行结果：

函数说明

arv_camera_new

简介：创建一个ArvCamera对象，如果name是NULL，则连接第一个可用的相机。

ArvCamera* arv_camera_new (const char* name, GError** error)

如果是Gige相机，name的格式可以是：

<vendor>-<model>-<serial>
<vendor_alias>-<serial>
<vendor>-<serial>
<user_id>
<ip_address>
<mac_address>

例如：

The Imaging Source Europe GmbH-DFK 33GX265-39020369
The Imaging Source Europe GmbH-39020369
TIS-39020369
192.168.0.2
00:07:48:af:a2:61

Available since 0.8.0

arv_camera_acquisition

简介：获取一帧图像。
注意：①本函数会将相机设置为单帧采集模式②返回的buffer最终必须要通过g_object_unref()释放

ArvBuffer* arv_camera_acquisition(
	ArvCamera* camera,         
	guint64 timeout,     //采集超时时间，单位µs
	GError** error)

Available since: 0.8.0

arv_camera_get_model_name

简介：获取相机型号名称

const char* arv_camera_get_model_name (ArvCamera* camera, GError** error)

Available since 0.8.0

arv_buffer_get_image_width

简介：获取图片的width
注意：此函数只能在buffer payload为ARV_BUFFER_PAYLOAD_TYPE_IMAGE、ARV_BUFFER_PAYLOAD_TYPE_EXTENDED_CHUNK_DATA或ARV_BUFFER_PAYLOAD_TYPE_MULTIPART时使用

gint arv_buffer_get_image_width(ArvBuffer* buffer)

Available since: 0.4.0

arv_buffer_get_image_height

简介：获取图片的height
注意：此函数只能在buffer payload为ARV_BUFFER_PAYLOAD_TYPE_IMAGE、ARV_BUFFER_PAYLOAD_TYPE_EXTENDED_CHUNK_DATA或ARV_BUFFER_PAYLOAD_TYPE_MULTIPART时使用

gint arv_buffer_get_image_height(ArvBuffer* buffer)

Available since: 0.4.0