Return to chgdata.c CVS log

Up to [WindowsNT SDKs] / q_a / samples / bpointer

Annotation of q_a/samples/bpointer/chgdata.c, revision 1.1.1.1

1.1       root        1: 
                      2: /******************************************************************************\
                      3: *       This is a part of the Microsoft Source Code Samples. 
                      4: *       Copyright (C) 1993 Microsoft Corporation.
                      5: *       All rights reserved. 
                      6: *       This source code is only intended as a supplement to 
                      7: *       Microsoft Development Tools and/or WinHelp documentation.
                      8: *       See these sources for detailed information regarding the 
                      9: *       Microsoft samples programs.
                     10: \******************************************************************************/
                     11: 
                     12: /******************************************************************************\
                     13: *
                     14: *  PROGRAM:     chgdata.C
                     15: *  Part of:     BPointer sample application
                     16: *
                     17: \******************************************************************************/
                     18: 
                     19: #include <windows.h>
                     20: #include <stdio.h>
                     21: #include "shrstuff.h"
                     22: 
                     23: 
                     24: void InsertElement(int iValue)
                     25: {
                     26:   clRunning->iElement = iValue;
                     27:   clRunning->clNext = clRunning + 1;
                     28:   clRunning += 1;
                     29: }
                     30: 
                     31: 
                     32: int main(void)
                     33: { HANDLE hFileMapping;
                     34:   int iCounter;
                     35:   int iNextElement;
                     36:   int iInternalCounter = 0;
                     37: 
                     38: // Set up the shared memory. By using MapViewOfFileEx(), we force the
                     39: // memory onto a specific location. This is just to show how based
                     40: // pointers work for memory that is mapped differenctly in two processes.
                     41: 
                     42:       hFileMapping = CreateFileMapping((HANDLE)0xffffffff,NULL,PAGE_READWRITE,0,4096,
                     43:                                        "DemoMapObject");
                     44:       if (GetLastError() == ERROR_ALREADY_EXISTS)
                     45:          { printf("Please close readdata before running this application!");
                     46:            return(0);
                     47:          };
                     48:       if (!hFileMapping)
                     49:          { printf ("Failed on CreateFileMapping...");
                     50:            return(0);
                     51:          };
                     52:       clBasePt = (CHAINLIST *)MapViewOfFileEx(hFileMapping,FILE_MAP_ALL_ACCESS,0,0,0,
                     53:                                 (PVOID)0x40000000);
                     54: 
                     55: // Now the memory is set up. The following loops prompts the user for new
                     56: // elements until a 0 is hit. The memory is displayed so that we see that
                     57: // the offsets are entered into the link fields, ignoring the based
                     58: // pointers.
                     59: 
                     60:       printf("Base address of file mapping in this process: 0x%x\n",(int)clBasePt);
                     61:       printf("Enter element to insert; 0 terminates: ");
                     62:       scanf("%d",&iNextElement);
                     63:       while (iNextElement != 0)
                     64:        { InsertElement(iNextElement);
                     65:          iInternalCounter+= sizeof(CHAINLIST);
                     66:          printf ("Now displaying raw data at address: 0x%x\n",(int)clBasePt);
                     67:          printf ("You might want to run readdata.exe now.\n");
                     68:          for (iCounter = 0; iCounter<=iInternalCounter;iCounter++)
                     69:            printf("%2x ",((char *)clBasePt)[iCounter]);
                     70:          printf("\n");
                     71:          printf("Enter next element to insert; 0 terminates: ");
                     72:          scanf("%d",&iNextElement);
                     73:        };
                     74: 
                     75: // user has entered 0 -- now clean up.
                     76: 
                     77:       UnmapViewOfFile(clBasePt);
                     78:       CloseHandle(hFileMapping);
                     79:   return(0);
                     80: }
                     81: 
                     82: 
                     83: 
                     84: 
                     85: 
                     86: 
                     87: 
                     88: 
                     89: 
                     90: 
                     91: 
                     92: 
                     93: 

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.