在C,C检测Windows或Linux ++ [英] Detect Windows or Linux in C, C++
问题描述
我写一个跨平台的程序。我想这一个程序的Windows和Linux下运行,所以我对两个平台两个不同的code段。如果操作系统是Windows,我想第一个code段运行;如果是Linux的话,我希望第二个code段运行。
所以我写了下面code,但同时兼具Windows和Linux上构建它会得到一个错误。我应该怎么做才能解决呢?
#IFDEF __unix__ / * __unix__通常是由编译器针对Unix系统定义* / #定义OS_Windows 0
#包括LT&;&unistd.h中GT;
#包括LT&;&stdlib.h中GT;
#包括LT&;&stdio.h中GT;
#包括LT&;&string.h中GT;#elif指令定义(_WIN32)||定义(WIN32)/ * _WIN32通常是由编译器针对32位或64位Windows系统中定义* / #定义OS_Windows 1
#包括LT&;&WINDOWS.H GT;
#包括LT&;&stdio.h中GT;
#包括LT&;&TCHAR.H GT;
DIV的#define 1048576
#定义宽度7#万一INT主(INT ARGC,CHAR *的argv [])
{
如果(OS_Windows)
{
MEMORYSTATUSEX statex;
statex.dwLength = sizeof的(statex);
GlobalMemoryStatusEx(安培; statex); _tprintf(TEXT(还有就是在使用内存%* LD %%。\\ n),
WIDTH,statex.dwMemoryLoad); } 否则,如果(!OS_Windows)//如果操作系统是UNIX {
CHAR CMD [30];
INT标志= 0;
FILE * FP;
焦线[130];
INT memTotal,memFree,memUsed; 标志= 0;
的memcpy(CMD,\\ 0,30);
sprintf的(CMD免费-t -m | grep的总);
FP =的popen(CMD,R);
而(与fgets(行,sizeof的线,FP))
{
标志++;
sscanf的(行,%* S%D%D,&安培; TotalMem,&安培; TotalUsed,&安培; TotalFree);
}
pclose函数(FP); 如果(标志)
的printf(TotalMem数:%d - TotalUsed数:%d - TotalFree数:%d \\ n,TotalMem,TotalUsed,TotalFree);
其他
的printf(未找到\\ n); } 返回0;
}
它通常是这样做(或多或少):
的#ifdef _WIN32
#包括LT&;&WINDOWS.H GT;
#包括LT&;&stdio.h中GT;
#包括LT&;&TCHAR.H GT;DIV的#define 1048576
#定义宽度7
#万一#IFDEF的Linux
#包括LT&;&unistd.h中GT;
#包括LT&;&stdlib.h中GT;
#包括LT&;&stdio.h中GT;
#包括LT&;&string.h中GT;
#万一
INT主(INT ARGC,CHAR *的argv [])
{
#IFDEF _WIN32
MEMORYSTATUSEX statex;
statex.dwLength = sizeof的(statex);
GlobalMemoryStatusEx(安培; statex); _tprintf(TEXT(还有就是在使用内存%* LD %%。\\ n),
WIDTH,statex.dwMemoryLoad);
#万一#IFDEF的Linux
CHAR CMD [30];
INT标志= 0;
FILE * FP;
焦线[130];
INT TotalMem,TotalFree,TotalUsed;标志= 0;
的memcpy(CMD,\\ 0,30);
sprintf的(CMD免费-t -m | grep的总);
FP =的popen(CMD,R);
而(与fgets(行,sizeof的线,FP))
{
标志++;
sscanf的(行,%* S%D%D,&安培; TotalMem,&安培; TotalUsed,&安培; TotalFree);
}
pclose函数(FP);如果(标志)
的printf(TotalMem数:%d - TotalUsed数:%d - TotalFree数:%d \\ n,TotalMem,TotalUsed,TotalFree);
其他
的printf(未找到\\ n);
#万一 返回0;
}
这种方式,仅适用于Linux code将被编译,而在Linux平台上,只有窗户code将在Windows平台上编译。
I am writing a cross platform program. I want this one program to run under both Windows and Linux, so I have two different code segments for the two platforms. If the OS is Windows, I want the first code segment to run; if it's Linux, then I want the second code segment to run.
So I wrote the following code, but it gets an error while building both on Windows and on Linux. What should I do to solve it?
#ifdef __unix__ /* __unix__ is usually defined by 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 is usually defined by 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 is %*ld %% of memory in use.\n"),
WIDTH, statex.dwMemoryLoad);
}
else if(!OS_Windows) // if OS is 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 generally done like this (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 is %*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, only code for linux will be compiled while on a linux platform, and only windows code will be compiled on a windows platform.
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