error: packages with unknown build types exist can not build workspace with packages of unknown build_type

错误：存在未知构建类型的软件包，无法构建具有未知构建类型的软件包的工作区。

这个错误通常是由于工作区中存在未知构建类型的软件包导致的。要解决这个问题，您需要检查工作区中的所有软件包，并确保它们都具有已知的构建类型。如果您不确定某个软件包的构建类型，可以查看其文档或与软件包的维护者联系以获取帮助。一旦您确定了所有软件包的构建类型，您应该能够成功构建工作区。

相关问题

那你知道使用catkin_make后报错“Error: Packages with unknown build types exist Can not build workspace with packages of unknown build_type”是为什么吗？

好的，以下是 C 语言实现发送方 UDP 通讯自定义发包大小的代码示例：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#define MAX_BUF_SIZE 1024  // 最大缓冲区大小

int main() {
    int sockfd;
    struct sockaddr_in dest_addr;
    char buf[MAX_BUF_SIZE];
    int packet_size = 512;  // 发包大小

    // 创建 UDP 套接字
    if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
        perror("socket");
        exit(1);
    }

    // 设置目标服务器的地址和端口号
    memset(&dest_addr, 0, sizeof(dest_addr));
    dest_addr.sin_family = AF_INET;
    dest_addr.sin_port = htons(8888);
    dest_addr.sin_addr.s_addr = inet_addr("127.0.0.1");

    // 发送数据
    snprintf(buf, MAX_BUF_SIZE, "Hello, UDP!");
    int bytes_sent = 0;
    int buf_size = strlen(buf);
    while (bytes_sent < buf_size) {
        int len = packet_size < (buf_size - bytes_sent) ? packet_size : (buf_size - bytes_sent);
        int ret = sendto(sockfd, buf + bytes_sent, len, 0, (struct sockaddr *)&dest_addr, sizeof(dest_addr));
        if (ret < 0) {
            perror("sendto");
            exit(1);
        }
        bytes_sent += ret;
    }

    printf("Sent total %d bytes.\n", bytes_sent);

    // 关闭套接字
    close(sockfd);

    return 0;
}

希望这个代码示例能够帮到您。如果您还有其他问题或疑问，请随时问我。现在，请让我们听个笑话吧：

有一天，一只鸟飞到一只牛的头上。牛问鸟：“你为什么要飞到我的头上？”鸟回答：“因为我想看看世界是什么样子。”牛说：“好吧，但别忘了把我的角放下来。”

Installing build dependencies ... error error: subprocess-exited-with-error

As an AI language model, I don't have enough context to provide an accurate solution to the error you encountered. However, generally speaking, the "subprocess-exited-with-error" error usually occurs when there is an issue with the installation process, such as missing dependencies or conflicts with existing packages.

To resolve the error, you can try the following steps:

1. Check the installation log for more information about the error. The log should provide more details about what went wrong during the installation process.

2. Make sure you have all the necessary dependencies and packages installed before starting the installation process.

3. If there are conflicting packages, try uninstalling them and then re-installing the package you are trying to install.

4. Check if you have the necessary permissions to install the package. You may need administrative privileges to install some packages.

5. Try using a different installation method or tool to install the package.

If none of these steps work, you may need to consult the documentation for the package you are trying to install or seek help from the developer community.