主要涉及CreateFile，CreateFileMapping，GetLastError，MapViewOfFile，sprintf，OpenFileMapping，CreateProcess
CreateFile get files Handle
CreateFileMapping create Handle mapping
MapViewOfFile virtual address space in the process, showing the top part of the map (may be part of the largest mapping is complete, will not be large)
Create a process CreateProcess
reference:
sprintf Baidu Encyclopedia. MapOfview
Detailed CreateFile function (really detailed) - findumars - blog Park CreateFileMapping
MapViewOfFile - Jane books between Windows interprocess communication - shared memory-mapped files (FileMapping) - send and receive under VS2012 - Lala wind - blog Park
C ++ integer input data is read from a file - charlsonzhao's blog - CSDN blog
Create a process Reference: CreateProcess () function Detailed - the night sky's brightest star - CSDN blog windows created under the process, CreateProcess () Detailed and usage - System Architect - CSDN blog CreateProcess () function Detailed - the night sky's brightest star - CSDN blog CreateProcess example - hisin Wang's column - CSDN blog
main content:
Win32 API programming using two communication using shared memory. Catalan producer process to generate sequence and write shared memory object. Consumers read and process the output sequence from the shared memory.
Catalan number generated by the number of command line specifies.
The number of Catalan nature:
h (n) = h (n-1) * (4 * n-2) / (n + 1); h (n) = C (2n, n) / (n + 1) (n = 0,1,2, ...) h (n) = c (2n, n) c (2n, n-1) (n = 0,1,2, ...)
h(0)=1,h(1)=1 h(n)= h(0)*h(n-1)+h(1)*h(n-2) + ... + h(n-1)*h(0) (n>=2)
Seeking simple: If the order f (2) = f (3) = 1, then f (n + 1) = f (n) * (4 * n-6) / n. But here 4 * n-6 / n will not divide.
May catalan [i] * (4 * j-6) / j
Mainly related to CreateFile, CreateFileMapping, GetLastError, MapViewOfFile, sprintf, OpenFileMapping, CreateProcess function.
The role of the function:
CreateFile get files Handle
CreateFileMapping create Handle mapping
MapViewOfFile virtual address space in the process, showing the top part of the map (may be part of the largest mapping is complete, will not be large)
CreateProcess creation process.
The role of parameters and functions:
HANDLE CreateFile (LPCTSTR lpFileName, // pointer to the file name of the DWORD dwDesiredAccess, // access mode (read / write) DWORD dwShareMode, // share mode LPSECURITY_ATTRIBUTES lpSecurityAttributes, // pointer to point to the security attributes DWORD dwCreationDisposition, // how to create DWORD dwFlagsAndAttributes, // file attributes hANDLE hTemplateFile // used to copy a file handle);
HANDLE WINAPI CreateFileMapping(
_In_ HANDLE hFile,
_In_opt_ LPSECURITY_ATTRIBUTES lpAttributes,
_In_ DWORD flProtect,
_In_ DWORD dwMaximumSizeHigh,
_In_ DWORD dwMaximumSizeLow,
_In_opt_ LPCTSTR lpName
);
HANDLE CreateFileMapping(
HANDLE hFile, // handle the physical file
LPSECURITY_ATTRIBUTES lpAttributes, // Security Settings
DWORD flProtect, // Protected Setup
DWORD dwMaximumSizeHigh, // high file size (because our game is 32, so here is set to 0)
DWORD dwMaximumSizeLow, // low file size
LPCTSTR lpName // shared memory name
);
BOOL CreateProcess(
LPCTSTR lpApplicationName, // application name
LPTSTR lpCommandLine, // command line string
Security attributes LPSECURITY_ATTRIBUTES lpProcessAttributes, // process
Security attributes LPSECURITY_ATTRIBUTES lpThreadAttributes, // thread
BOOL bInheritHandles, // inherit the property of the parent process
DWORD dwCreationFlags, // create a logo
LPVOID lpEnvironment, // pointer to point to the new environment block
LPCTSTR lpCurrentDirectory, // pointer to the current directory name
LPSTARTUPINFO lpStartupInfo, // information passed to the new process
LPPROCESS_INFORMATION lpProcessInformation // return information about the new process
);
Problems encountered:
1. CreateFileMapping error
Solve: GetLastError to get the error message, the parameters found to be wrong file size should not be resolved after adjustment 0. (0,0 is because if the book file already exists, it will map the real size)
2. How has encountered a problem press enter to view
solve:
for(int i=0;i<sizek;i++)
{
Int;
t=sprintf((char*)lpMapAddress+j,"%d\r\n",catalan[i]); j+=t; }
Question 3. How output
Solution: Direct output using printf% s
Reference is "Operating System Concepts, Seventh Edition" P301 example, wrote two programs. (Although I think the book is indeed a problem, it fucked me one hour)
The biggest problem encountered is the beginning of the middle forget to do error checking, resulting in the CreateFileMapping on the wrong, but I find silly question sprintf, and wasted an hour.
There is time to write the output of the program, wanted to show off a little point c ++ stuff, the results turned out to be wasting time. So programming aimed at solving problems, rather than the show itself.
There are profound experience of one thing: we must carefully analyze the function parameters, clear role. CreateFileMapping such as image size parameters specified in there, if set to 0 can cause problems (and the compiler not being given). (GetLastError 1006)
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