Re: Passing binary data to dll
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- Subject: Re: Passing binary data to dll
- From: "Robert G. Jakabosky" <bobby@...>
- Date: 2012年8月14日 20:50:13 -0700
On Tuesday 14, Digital wrote:
> I've been trying this for a very long time, never succeeded in passing
> binary data.
>
> But here is a function:
>
> static int testfunc(lua_State *L)
> {
> printf("test func\n");
>
> char *arg1;
> int i;
> size_t len = 0;
> arg1 = luaL_checklstring(L, 1, &len);
> //arg1 = luaL_checkudata(L, 1, &len);
> //arg1 = lua_touserdata(L, 1);
> //len=strlen(arg1);
> printf("Size = %s\n",arg1);
Don't try to print binary data with printf().
printf("arg1 len = %zd\n", len);
/* print hex dump of arg1 */
for(i = 0; i < len; i++) {
if((i % 16) == 0 && i > 0) printf("\n");
printf("%02x ", arg1[i]);
}
printf("\n");
>
> FILE *sfile;
> sfile = fopen("testfilebinary.txt","wb");
> fwrite(arg1,len,1,sfile);
Also check the return value from fwrite(). Also I would swap the 'len' & '1'
parameters.
size_t rc = fwrite(arg1, 1, len, sfile);
printf("fwrite() = %zd\n", rc);
> fclose(sfile);
>
> return 0;
> }
--
Robert G. Jakabosky