我正在写一个跨平台的程序.我希望这一个程序同时在Windows和Linux下运行,所以我有两个不同的代码段用于这两个平台.如果操作系统是Windows,我希望运行第一个代码段;如果是Linux,那么我希望运行第二个代码段.
因此,我编写了以下代码,但在Windows和Linux上构建时出现错误.我应该怎么做才能解决这个问题呢?
#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;
}