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Code:
#include <windows.h>
//#pragma comment(lib,"winmm.lib")  //für MSV C++ 

BOOL DoOpenCdRom(void) 
{ 
  char chrRc[256]; 
  char *ptrChrRc = &chrRc[0]; 
  return mciSendString("Set CDAudio Door Open\0",ptrChrRc,256,NULL); 
  
} 

BOOL DoCloseCdRom(void) 
{ 

  char chrRc[256]; 
  char *ptrChrRc = &chrRc[0]; 
  return mciSendString("Set CDAudio Door Closed\0",ptrChrRc,256,NULL); 
} 

int main() 
{ 
 DoOpenCdRom();
 Sleep(5000);
 DoCloseCdRom(); 

 return 0;
}