英文:
How to pass args to wasm?
问题
#include <iostream>
int main(int argc, char** argv) {
if (argc > 1)
printf("%s", argv[1]);
}
构建：
emcc ./test.cpp -sENVIRONMENT=shell -o test.js
将命令行参数传递到C++代码中。
英文:
I use emcc to complie a C++ code into js.
But how to pass args to C++ code?
#include<iostream>
int main(int argc, char** argv) {
if (argc > 1)
printf("%s", argv[1]);
}
build :
emcc ./test.cpp -sENVIRONMENT=shell -o test.js
pass commadline args into c code
答案1
得分: 2
这个stackexchange答案似乎与您的用例相似：
在运行您的函数之前，放置以下代码：
Module['arguments'].push('first_param');
Module['arguments'].push('second_param');
int main(int argc, char *argv[])
{
assert(argc == 3);
assert(strcmp(argv[1], "first_param") == 0);
assert(strcmp(argv[2], "second_param") == 0);
}
编辑：
所以，最终我有时间安装了d8，并使其正常工作。
对我来说，在生成的test.js中，有这一行：
if (Module['arguments']) arguments_ = Module['arguments'];legacyModuleProp('arguments', 'arguments_');
您必须在此之前放置参数，所以它应该如下所示：
Module['arguments'] = [];
Module['arguments'].push('first_param');
Module['arguments'].push('second_param');
if (Module['arguments']) arguments_ = Module['arguments'];legacyModuleProp('arguments', 'arguments_');
然后使用emcc进行编译，并使用d8运行。我遇到了另一个错误，因为我没有在printf调用中添加换行符，所以输出没有打印，这似乎也发生在您的代码中。幸运的是，有一个关于标准输出没有完全刷新的错误消息，所以我明白了这个问题。
英文:
It seems that this stackexchange answer is similar to your use-case:
Place
Module['arguments'].push('first_param');
Module['arguments'].push('second_param');
before you run your function.
int main(int argc, char *argv[])
{
assert(argc == 3);
assert(strcmp(argv[1], "first_param") == 0);
assert(strcmp(argv[2], "second_param") == 0);
}
Edit:
So, I finally had time to install d8, and I made it work.
For me, in the generated test.js, there is this line:
if (Module['arguments']) arguments_ = Module['arguments'];legacyModuleProp('arguments', 'arguments_');
You have to place the arguments before this, so it should look like:
Module['arguments'] = [];
Module['arguments'].push('first_param');
Module['arguments'].push('second_param');
if (Module['arguments']) arguments_ = Module['arguments'];legacyModuleProp('arguments', 'arguments_');
You then compile with emcc and run with d8. I got another error because I did not end my printf call without a newline, so the output was not printing, a thing that seems to also happen in your code. Fortunately, there was an error message about the stdout not fully flushing, so I got to understand that was the problem.
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