C++写日志

#include <windows.h>
#include <stdio.h>
void WriteToLog(char* szMyPath,BYTE *pData, int len, BOOL bSend)
{
 SYSTEMTIME st;
 GetLocalTime(&st);

 char sPath[256], sFile[256], sWrite[5000];
 memset(sWrite, 0, 5000);
 memset(sPath, 0, 256);
 strcpy(sPath, szMyPath/*"C:\\"*/); //同一路径下

    memset(sFile, 0, 256);
 sprintf(sFile, "%d%02d%02d%02d.log", st.wYear, st.wMonth, st.wDay, st.wHour);
    sprintf(sPath, "%s\\%s", szMyPath, sFile);
   
 sprintf(sWrite, "%02d:%02d:%02d ", st.wHour, st.wMinute, st.wSecond);
 if (bSend)
 {
  strcat(sWrite, "发送：");
 }
 else
 {
  strcat(sWrite, "接收：");
 }

 for (int i=0; i<len; i++)
 {
  char temp[20];
  memset(temp, 0, 20);
  sprintf(temp, "%02X ", pData[i]);
  strcat(sWrite, temp);
 }
 strcat(sWrite, "\r");
 strcat(sWrite, "\n");
 
 FILE *pFile;
    pFile = fopen(sPath, "at+"); //
 if (pFile != NULL)
 {
  fputs(sWrite, pFile);
  fclose(pFile);
 }
}

void main()
{
 BYTE a[5] = {"1111"};
 WriteToLog("d:\\",(BYTE*)a,5,FALSE);
 printf("The bytes of the variables are:\n");
 printf("BYTE:%d bytes\n",sizeof(BYTE));
 printf("int:%d bytes\n",sizeof(int)); 
 printf("int:%d bytes\n",sizeof(unsigned int));
 printf("char:%d byte\n",sizeof(char));       /* char型的字节数为1  */  
 printf("short:%d bytes\n",sizeof(short));        /* short型的字节数为2 */ 
 printf("long:%d bytes\n",sizeof(long));   /* long型的字节数为4  */ 
 printf("float:%d bytes\n",sizeof(float));       /* float型的字节数为4 */  
 printf("double:%d bytes\n",sizeof(double));   /* double型的字节数为8 */ 
 int nint = 0xFFFFFFFF;
 printf("%x\n",nint);
 char chchar = 0x01;
 printf("%x\n",chchar);
 WORD wword = chchar<<8|chchar;
 printf("%x",wword);
}