C + + LocalAlloc () & Localsize () & LocalFree ()

For LocalAlloc function, refer to: https://msdn.microsoft.com/en-us/library/windows/desktop/aa366723 (v=vs.85). aspx

For localsize function, refer to: https://msdn.microsoft.com/en-us/library/windows/desktop/aa366745 (v=vs.85). aspx

For LocalFree function, refer to: https://msdn.microsoft.com/en-us/library/windows/desktop/aa366730 (v=vs.85). aspx

The following code is excerpted from: https://msdn.microsoft.com/en-us/library/windows/desktop/aa366723 (v=vs.85). aspx

Ide:code::blocks 16.01

Operating system: Windows 7 x64

1#include <windows.h>2#include <stdio.h>3#include <tchar.h>4 5 int_cdecl _tmain ()6 {7LPTSTR Pszbuf =NULL;8 9Pszbuf =(LPTSTR) LocalAlloc (Ten Lptr, OneMAX_PATH *sizeof(TCHAR)); A  -     //Handle Error Condition -     if(Pszbuf = =NULL) the     { -_tprintf (TEXT ("LocalAlloc failed (%ld) \ n"), GetLastError ()); -         return 1; -     } +  -     //See how much memory is allocated +_tprintf (TEXT ("LocalAlloc Allocated%d bytes\n"), Localsize (PSZBUF)); A  at     //Use the memory allocated -  -     //Free the memory when finished with it - LocalFree (PSZBUF); -  -     return 0; in}

Running results in Code::Blocks 16.01:

Ide:microsoft Visual Studio Community 2017 15.5.2

Operating system: Windows 7 x64

1#include"stdafx.h"2 3#include <windows.h>4 //#include <stdio.h>5 //#include <tchar.h>6 7 int_cdecl _tmain ()8 {9LPTSTR Pszbuf =NULL;Ten  OnePszbuf =(LPTSTR) LocalAlloc ( A Lptr, -MAX_PATH *sizeof(TCHAR)); -  the     //Handle Error Condition -     if(Pszbuf = =NULL) -     { -_tprintf (TEXT ("LocalAlloc failed (%d) \ n"), GetLastError ()); +         return 1; -     } +  A     //See how much memory is allocated at_tprintf (TEXT ("LocalAlloc Allocated%d bytes\n"), Localsize (PSZBUF)); -  -     //Use the memory allocated -  -     //Free the memory when finished with it - LocalFree (PSZBUF); in  - GetChar (); to  +     return 0; -}

Running results in Microsoft Visual Studio Community 2017 15.5.2:

The result of two IDE runs is different because TCHAR is defined differently in two Ides.

In Code::Blocks 16.01, TCHAR is defined as:

typedef CHAR TCHAR;

Char CHAR;

In Microsoft Visual Studio Community 2017 15.5.2, this is the case:

typedef wchar_t     TCHAR;

About Lptr, in Code::Blocks 16.01, is defined as:

#define LPTR 64

In Microsoft Visual Studio Community 2017 15.5.2, this is the case:

#define Lptr                (lmem_fixed | Lmem_zeroinit)

#define Lmem_fixed          0x0000

#define Lmem_zeroinit       0x0040

The two are equivalent, but the definition of Microsoft Visual Studio Community 2017 15.5.2 is clearer and at a glance.

About Lmem_fixed:allocates FIXED memory. The return value is a pointer to the memory object.

About lmem_zeroinit:initializes memory contents to zero.

C + + LocalAlloc () & Localsize () & LocalFree ()