关于LocalAlloc function，参考：https://msdn.microsoft.com/en-us/library/windows/desktop/aa366723(v=vs.85).aspx
关于LocalSize function，参考：https://msdn.microsoft.com/en-us/library/windows/desktop/aa366745(v=vs.85).aspx
关于LocalFree function，参考：https://msdn.microsoft.com/en-us/library/windows/desktop/aa366730(v=vs.85).aspx
以下代码摘自：https://msdn.microsoft.com/en-us/library/windows/desktop/aa366723(v=vs.85).aspx
IDE: Code::Blocks 16.01
操作系统：Windows 7 x64
1 #include <windows.h> 2 #include <stdio.h> 3 #include <tchar.h> 4 5 int _cdecl _tmain() 6 { 7 LPTSTR pszBuf = NULL; 8 9 pszBuf = (LPTSTR)LocalAlloc( 10 LPTR, 11 MAX_PATH * sizeof(TCHAR)); 12 13 // Handle error condition 14 if (pszBuf == NULL) 15 { 16 _tprintf(TEXT("LocalAlloc failed (%ld)\n"), GetLastError()); 17 return 1; 18 } 19 20 //see how much memory was allocated 21 _tprintf(TEXT("LocalAlloc allocated %d bytes\n"), LocalSize(pszBuf)); 22 23 // Use the memory allocated 24 25 // Free the memory when finished with it 26 LocalFree(pszBuf); 27 28 return 0; 29 }
在Code::Blocks 16.01中的运行结果：
IDE: Microsoft Visual Studio Community 2017 15.5.2
操作系统：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 { 9 LPTSTR pszBuf = NULL; 10 11 pszBuf = (LPTSTR)LocalAlloc( 12 LPTR, 13 MAX_PATH * sizeof(TCHAR)); 14 15 // Handle error condition 16 if (pszBuf == NULL) 17 { 18 _tprintf(TEXT("LocalAlloc failed (%d)\n"), GetLastError()); 19 return 1; 20 } 21 22 //see how much memory was allocated 23 _tprintf(TEXT("LocalAlloc allocated %d bytes\n"), LocalSize(pszBuf)); 24 25 // Use the memory allocated 26 27 // Free the memory when finished with it 28 LocalFree(pszBuf); 29 30 getchar(); 31 32 return 0; 33 }
在Microsoft Visual Studio Community 2017 15.5.2中的运行结果：
造成两个IDE的运行结果不一样的原因，是因为TCHAR在两个IDE中的定义不一样。
在Code::Blocks 16.01中，TCHAR是这样定义的：
typedef CHAR TCHAR;
typedef char CHAR;
而在Microsoft Visual Studio Community 2017 15.5.2中，则是这样的：
typedef wchar_t TCHAR;
关于LPTR，在Code::Blocks 16.01中，是这样定义的：
#define LPTR 64
而在Microsoft Visual Studio Community 2017 15.5.2中，则这样：
#define LPTR (LMEM_FIXED | LMEM_ZEROINIT)
#define LMEM_FIXED 0x0000
#define LMEM_ZEROINIT 0x0040
两者是等效的，不过Microsoft Visual Studio Community 2017 15.5.2的定义则比较清晰，一目了然。
关于LMEM_FIXED：Allocates fixed memory. The return value is a pointer to the memory object.
关于LMEM_ZEROINIT：Initializes memory contents to zero.
