Detect Windows or Linux in C, C++ -


i writing cross platform program. want 1 program run under both windows , linux, have 2 different code segments 2 platforms. if os windows, want first code segment run; if it's linux, want second code segment run.

so wrote following code, gets error while building both on windows , on linux. should solve it?

#ifdef __unix__                    /* __unix__ defined compilers targeting unix systems */      #define os_windows 0     #include <unistd.h>     #include <stdlib.h>     #include <stdio.h>     #include <string.h>  #elif defined(_win32) || defined(win32)     /* _win32 defined compilers targeting 32 or   64 bit windows systems */      #define os_windows 1     #include <windows.h>     #include <stdio.h>     #include <tchar.h>     #define div 1048576     #define width 7  #endif  int main(int argc, char *argv[]) {     if(os_windows)     {         memorystatusex statex;         statex.dwlength = sizeof (statex);         globalmemorystatusex (&statex);          _tprintf (text("there  %*ld %% of memory in use.\n"),                     width, statex.dwmemoryload);      }      else if(!os_windows) // if os unix      {         char cmd[30];         int flag = 0;         file *fp;         char line[130];         int memtotal, memfree, memused;          flag=0;         memcpy (cmd,"\0",30);         sprintf(cmd,"free -t -m|grep total");         fp = popen(cmd, "r");         while ( fgets( line, sizeof line, fp))         {             flag++;             sscanf(line,"%*s %d %d %d",&totalmem, &totalused, &totalfree);         }         pclose(fp);          if(flag)             printf("totalmem:%d -- totalused:%d -- totalfree:%d\n",totalmem,totalused,totalfree);         else             printf("not found\n");      }      return 0; }

it's done (more or less):

#ifdef _win32 #include <windows.h> #include <stdio.h> #include <tchar.h>  #define div 1048576  #define width 7 #endif  #ifdef linux #include <unistd.h> #include <stdlib.h> #include <stdio.h> #include <string.h> #endif   int main(int argc, char *argv[])  { #ifdef _win32 memorystatusex statex;     statex.dwlength = sizeof (statex);     globalmemorystatusex (&statex);      _tprintf (text("there  %*ld %% of memory in use.\n"),             width, statex.dwmemoryload); #endif  #ifdef linux char cmd[30]; int flag = 0;    file *fp; char line[130];      int totalmem, totalfree, totalused;  flag=0; memcpy (cmd,"\0",30); sprintf(cmd,"free -t -m|grep total");           fp = popen(cmd, "r");        while ( fgets( line, sizeof line, fp)) {        flag++;     sscanf(line,"%*s %d %d %d",&totalmem, &totalused, &totalfree); } pclose(fp);   if(flag)     printf("totalmem:%d -- totalused:%d -- totalfree:%d\n",totalmem,totalused,totalfree); else      printf("not found\n"); #endif      return 0; }

this way, code linux compiled while on linux platform, , windows code compiled on windows platform.


Comments

Post a Comment

Popular posts from this blog

What is happening when Matlab is starting a "parallel pool"? -

running parallel cpu processes in matlab starts command parpool() according documentation , function: [creates] special job on pool of workers, , [connects] matlab client parallel pool. this function takes bit of time execute, on order of 30 seconds. in other multi-cpu paradigms openmp, parallel execution seems totally transparent -- i've never noticed behavior analogous matlab (granted i'm not experienced parallel programming). so, happening between time parpool() called , when finishes executing? takes long? parallel computing toolbox enables run matlab code in parallel using several different paradigms (e.g. jobs , tasks, parfor , spmd , parfeval , batch processing), , run either locally (parallelised across cores in local machine) or remotely (parallelised across machines in cluster - either 1 own, or 1 in cloud). in of these cases, code run on matlab workers , copies of matlab without interactive desktop. if you're intending run on remo...
Read more

angular - DownloadURL return null in below code -

when change file updated in firebase storage when try downloadurl show null. filechange(event: any) { const imagefolder: string = this.employee.id; const filelist: filelist = event.target.files; const file: file = filelist[0]; const storageref = firebase.storage().ref().child(`${imagefolder}/profile.jpg`).put(file); console.log(storageref.snapshot.downloadurl); } the put() asynchronous. if want url after file uploaded have this: firebase.storage().ref().child(`${imagefolder}/profile.jpg`).put(file).then((snapshot) => { storageref = snapshot.downloadurl: console.log(snapshot.downloadurl); });
Read more

php - Cannot override Laravel Spark authentication with own implementation -

during login process of laravel spark need request token of remote api. api stores exact same users , passwords laravel spark application. therefore need username , non hashed password of user during authentication process. i thought overriding authenticated method solution problem. in routes/web.php override post /login endpoint , pointing endpoint own logincontroller: <?php namespace app\http\controllers\auth; use illuminate\support\facades\log; use illuminate\http\request; use laravel\spark\http\controllers\auth\logincontroller sparklogincontroller; class logincontroller extends sparklogincontroller { /** * create new login controller instance. * * @return void */ public function __construct() { parent::__construct(); } /** * handle successful authentication attempt. * * @param request $request * @param \illuminate\contracts\auth\authenticatable $user * @return response */ public fu...
Read more