英文:
How to Pass Console Input to Subprocess from Golang
问题
我有以下的C程序。
#include<stdio.h>int main() {int i = 0;char ch;printf("Starting test application\n");for (i=0; i<10; i++) {ch = getchar();printf("character at %d = %d\n", i, ch);}return 0;}
我想从Go语言中将这个程序作为子进程运行。在我的Go代码中，我有一个byte数组，我希望将其用作输入传递给我的C程序。我尝试了以下方法，但没有成功。
cmd := exec.Command("/home/dodtech/go-workspace/MachineListener/Test")cmd.Stdout = os.Stdouterr := cmd.Start()if err == nil {var ctrlc [9]bytectrlc[0] = 0x00ctrlc[1] = 0x01ctrlc[2] = 0x02ctrlc[3] = 0x03ctrlc[4] = 0x04ctrlc[5] = 0x05ctrlc[6] = 0x06ctrlc[7] = 0x07ctrlc[8] = 0x08ctrlc[9] = 0x09cmd.Stdin = bytes.NewReader(ctrlc[0:])cmd.Stdin.Read(ctrlc[0:])}
需要注意的是，上述两个程序只是测试程序，它们只代表我想要实现的目标。它们并不旨在高效，并且没有按照编程准则编写（例如，字节数组的创建方式）。如果我能解决这个小问题，我就能将其移植到我的实际软件代码中。如果有人能指导我如何做到这一点，我将不胜感激。
英文:
I have the following C program.
#include<stdio.h>int main() {int i = 0;char ch;printf("Starting test application\n");for (i=0; i<10; i++) {ch = getchar();printf("character at %d = %d\n", i, ch);}return 0;}
I want to run this program as a sub-process from Go language. In my Go code, I have a byte array which I want to be used as input to my C program. I tried following approach and it did not work.
cmd := exec.Command("/home/dodtech/go-workspace/MachineListener/Test")cmd.Stdout = os.Stdouterr := cmd.Start()if err == nil {var ctrlc [9]bytectrlc[0] = 0x00ctrlc[1] = 0x01ctrlc[2] = 0x02ctrlc[3] = 0x03ctrlc[4] = 0x04ctrlc[5] = 0x05ctrlc[6] = 0x06ctrlc[7] = 0x07ctrlc[8] = 0x08ctrlc[9] = 0x09cmd.Stdin = bytes.NewReader(ctrlc[0:])cmd.Stdin.Read(ctrlc[0:])}
To be noted, both of the above program is just a test program and they only represent what I want to achieve. They are not meant to be efficient and was not written according to programming guidelines(for example the way byte array was created). If I can solve my problem for this small case, I will be able to port it to my actual software code. I would appreciate if anyone can guide me how I can do this .
答案1
得分: 1
如果你想写入子进程的标准输入，你应该使用StdinPipe。
像这样：
subStdin, err := cmd.StdinPipe()// 检查错误defer subStdin.Close()// 简单地将字节数组写入标准输入subStdin.Write(ctrlc)// io.WriteString(subStdin, "Hello World") 会检查管道是否是StringWriter类型，并使用该方法，如果不是，则将字符串转换为字节数组并写入。在这种情况下，我们知道该管道没有自己的写入字符串的方法。
请参阅完整示例的文档：
https://golang.org/pkg/os/exec/#Cmd.StdinPipe
英文:
If you want to write to the sub-process standard input, you should use StdinPipe.
Like:
subStdin, err := cmd.StdinPipe()// check errdefer subStdin.Close()// simply write the byte array you have to stdinsubStdin.Write(ctrlc)// io.WriteString(subStdin, "Hello World") will check if the pipe// is a StringWriter type and use that method, if not, then convert// the string to a byte array and write it. In this case we know// that the pipe does not have a method for writing strings to itself.
See the docs for a complete example:
答案2
得分: 1
如何：
cmd := exec.Command("/home/dodtech/go-workspace/MachineListener/Test")cmd.Stdin = bytes.NewReader([]byte{0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,})cmd.Stdout = os.Stdouterr := cmd.Start()if err != nil {// 处理错误}
这样应该可以得到你想要的结果...
英文:
How about:
cmd := exec.Command("/home/dodtech/go-workspace/MachineListener/Test")cmd.Stdin = bytes.NewReader([]byte{0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,})cmd.Stdout = os.Stdouterr := cmd.Start()if err != nil {// Handle error}
That should give you what you want...
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