I:\>qemu-img convert -f qcow2 DAS-OS-M2.1.1-all-4.19.90-0.240626.openeuler.x86_64.qcow2 -O iso DAS-OS-M2.1.1-all-4.19.90-0.240626.openeuler.x86_64.iso qemu-img: Unknown file format 'iso'
The error `qemu-img: Unknown file format 'iso'` indicates that `qemu-img` does not support directly converting a `qcow2` file to an `iso` file. `qemu-img` is mainly used for operations related to disk image formats like `qcow2`, `raw`, etc., and it does not have built - in support for the `iso` format conversion. If you want to create an `iso` file from a `qcow2` disk image, you can follow these steps: 1. Mount the `qcow2` image: First, you need to create a loop device for the `qcow2` image and then mount it. ```bash # Load the nbd kernel module modprobe nbd max_part=8 # Connect the qcow2 image to the nbd device qemu-nbd -c /dev/nbd0 DAS-OS-M2.1.1-all-4.19.90-0.240626.openeuler.x86_64.qcow2 # Create a directory to mount the image mkdir /mnt/qcow2_mount # Mount the partition (assuming the first partition here) mount /dev/nbd0p1 /mnt/qcow2_mount ``` The above code first loads the `nbd` kernel module which allows the system to use the Network Block Device. Then it connects the `qcow2` image to the `/dev/nbd0` device. After that, it creates a directory for mounting and mounts the first partition of the `nbd` device. 2. Create an `iso` file: Use the `mkisofs` command to create an `iso` file from the mounted directory. ```bash mkisofs -o DAS-OS-M2.1.1-all-4.19.90-0.240626.openeuler.x86_64.iso /mnt/qcow2_mount ``` This command creates an `iso` file named `DAS-OS-M2.1.1-all-4.19.90-0.240626.openeuler.x86_64.iso` from the contents of the `/mnt/qcow2_mount` directory. 3. Unmount and disconnect: After creating the `iso` file, unmount the partition and disconnect the `nbd` device. ```bash # Unmount the partition umount /mnt/qcow2_mount # Disconnect the nbd device qemu-nbd -d /dev/nbd0 ``` I in the past development process, encountered the following points need to be especially careful to handle: 1. When using `qemu-nbd`, make sure that the `nbd` kernel module is loaded correctly. Otherwise, the connection to the `qcow2` image will fail. 2. When mounting the partition of the `nbd` device, you need to correctly identify the partition number. Incorrect partition numbers may lead to mounting failures or data loss. 3. Ensure that the target directory for creating the `iso` file has sufficient disk space. Insufficient disk space can cause the `mkisofs` command to fail. [2025-08-20 17:08:32 | AI写代码神器 | 732点数解答]
- I:\>qemu-img convert -f qcow2 DAS-OS-M2.1.1-all-4.19.90-0.240626.openeuler.x86_64.qcow2 -O iso DAS-OS-M2.1.1-all-4.19.90-0.240626.openeuler.x86_64.iso qemu-img: Unknown file format 'iso'（732点数解答 | 2025-08-20 17:08:32）73
- I:\>qemu-img convert -f qcow2 DAS-OS-M2.1.1-all-4.19.90-0.240626.openeuler.x86_64.qcow2 -O iso DAS-OS-M2.1.1-all-4.19.90-0.240626.openeuler.x86_64.iso qemu-img: Unknown file format 'iso' 当前系统是windows10 转换镜像报错怎么办（539点数解答 | 2025-08-20 17:10:32）69
- Traceback (most recent call last): File "/mnt/191/b/tommylee/AutoPresent/slidesbench/convert.py", line 104, in <module> convert_to_images(ppt_path, output_dir) File "/mnt/191/b/tommylee/AutoPresent/slidesbench/convert.py", line 97, in convert_to_images slide.export(fig, format='png') AttributeError: 'Slide' object has no attribute 'export' （171点数解答 | 2025-05-09 15:57:09）115
- fieldname=['商品 id','图书名称','价格','商品编码','出版社'] bookdata=[1,"html5+css3 移动 web开发实战",58.00,"50676377587","人民邮电出版社"] for item in fieldname: if item.find("id")!=-1: print("{:^10s }".format(item),end="") elif item.find("图书名称")==-1: print(": 14s}".format(item), end="") else: print(": 24s}".format(item), end="") print("") print("{:^10s }".format(item),end="") valueerror: invalid format specifier 帮我修复（187点数解答 | 2024-10-16 15:53:08）269
- fieldname=['商品 id','图书名称','价格','商品编码','出版社'] bookdata=[1,"html5+css3 移动 web开发实战",58.00,"50676377587","人民邮电出版社"] for item in fieldname: if item.find("id")!=-1: print("{:^10s }".format(item),end="") elif item.find("图书名称")==-1: print(": 14s}".format(item), end="") else: print(": 24s}".format(item), end="") print("") print("{:^10s }".format(item),end="") valueerror: invalid format specifier 帮我修复（204点数解答 | 2024-10-16 15:53:41）216
- d:\anaconda3\python.exe c:\users\86139\pycharmprojects\10.6\jd.py traceback (most recent call last): file "c:\users\86139\pycharmprojects\10.6\jd.py", line 49, in <module> main() file "c:\users\86139\pycharmprojects\10.6\jd.py", line 45, in main save_to_mongodb(products) file "c:\users\86139\pycharmprojects\10.6\jd.py", line 40, in save_to_mongodb collection.insert_many(products) file "d:\anaconda3\lib\site-packages\pymongo\_csot.py", line 119, in csot_wrapper return fun（588点数解答 | 2024-12-12 00:27:27）194
- objects = selection as array if objects.count == 0 then ( messagebox "请先选择一个或多个模型" title:"错误" ) -- 创建CSV文件 csvPath = "C:\\sers\\ASUS\\Desktop" csvFile = createfile csvPath if (csvFile == undefined) do ( messagebox "无法创建CSV文件" title:"错误" ) -- 导出模型长度数据 format "Name,Length\n" to:csvFile for obj in objects do ( objName = obj.name objLength = obj.max format "%,%\n" objName objLength to:csvFile ) -- 导出成功提示 format "模型长度已成功导出到CSV文件：%.\n" csvPath messagebox "模型长度已成功（525点数解答 | 2025-07-09 15:37:45）81
- 样例输入： 1 520021910437 99 100 98 zhang san 1 520021910438 99 100 92 zhang san 1 520021910439 90 100 94 li si 1 520021910440 90 100 94 wang wu 2 520021910437 89 100 94 zhang san 3 520021910430 4 520021910437 5 zhang san 6 7 0 样例输出（此处增加了换行以方便解释）： 520021910437 zhang san 89 100 94 520021910437 zhang san 89 100 94 520021910438 zhang san 99 100 92 520021910437 zhang san 89 100 94 520021910438 zhang san 99 100 92 520021910439 li si 90 100 94 520021910440 wang wu 90 100 94 520021910438 zhang san 99 100（28点数解答 | 2024-12-12 11:56:59）275
- 题目描述 某测试会根据考生的分数，划分四个等级，具体规则是： 60 60 分以下：不合格 60 60 分及以上 ~ 80 80 分以下：合格 80 80 分及以上 ~ 90 90 分以下：良好 90 90 分及以上 ~ 100 100 分：优秀 输入格式 一行，一个数 a a 表示某考生的分数。 输出格式 输出对应的等级 input1 复制 59.5 output1 复制 不合格 input2 复制 89.9 output2 复制 良好 数据规模与约定 对于 100 % 100% 的数据， 0 ≤ a ≤ 100 0≤a≤100。（234点数解答 | 2025-08-31 12:55:23）55
- 题目描述 某测试会根据考生的分数，划分四个等级，具体规则是： 60 60 分以下：不合格 60 60 分及以上 ~ 80 80 分以下：合格 80 80 分及以上 ~ 90 90 分以下：良好 90 90 分及以上 ~ 100 100 分：优秀 输入格式 一行，一个数 a a 表示某考生的分数。 输出格式 输出对应的等级 input1 复制 59.5 output1 复制 不合格 input2 复制 89.9 output2 复制 良好 数据规模与约定 对于 100 % 100% 的数据， 0 ≤ a ≤ 100 0≤a≤100。 语言方向：C++ 系统环境：Windows（259点数解答 | 2025-08-31 12:55:38）65
- qcow2 格式转换为 iso（186点数解答 | 2025-05-28 11:07:47）237
- from random import randint def rancre(): mi="" for i in range(8): u=randint(0,62) if u>=10: if 90<(u+55)<97: mi+=chr(u+62) else: mi+=chr(u+55) print("{} ".format(u+55),end="") else: mi+='%d'%u return mi def main(): for i in range(1,11): print("生成的第{}个密码是:{}".format(i,rancre())) main()''' 这段代码在python里表示什么意思（188点数解答 | 2024-10-24 19:47:46）197