function main(){
write_file1()
write_File2()
}
function write_file1(){
//使用firda的自带api
var file = new File("/data/local/tmp/mytest.dat")
file.write("1234");
file.flush();
file.close();
}
function write_File2(){
var addr_fopen = Module.findExportByName("libc.so","fopen")
var addr_fputs = Module.findExportByName("libc.so","fputs")
var addr_fclose= Module.findExportByName("libc.so","fclose")
//NativeFunction 将地址创建为可调用的函数,第一个参数是函数地址,第二个参数是返回值类型,所有指针类型,包括string(char*),都是pointer
//第三个参数就是原函数的参数列表
var fopen = new NativeFunction(addr_fopen,"pointer",["pointer","pointer"])
var fputs = new NativeFunction(addr_fputs,"int",["pointer","pointer"]);
var fclose = new NativeFunction(addr_fclose,"int",["pointer"]);
var filename = Memory.allocUtf8String("/data/local/tmp/mytest.dat"); //native层需要这样创建字符串,在java层就可以直接写字符串
var open_mode = Memory.allocUtf8String("w+");
var file = fopen(filename,open_mode);
var buffer_str = Memory.allocUtf8String("1234")
var ret = fputs(buffer_str,file);
console.log("fputs ret:",ret);
fclose(file);
}
setImmediate(main)