进程间通讯 共享内存 问题

[JLDelphi]

这是写一个字符串信息：
int Length = strUID.GetLength();
HANDLE hmap;
hmap = ::CreateFileMapping((HANDLE)-1,NULL,PAGE_READONLY,0,Length,_T("MemoShare"));
if(hmap != NULL && GetLastError() == ERROR_ALREADY_EXISTS)
{
CString strUIDMap = (CString)(LPCTSTR)(LPSTR)(char*)::MapViewOfFile(hmap,FILE_MAP_READ,0,0,0);

strcpy((char*)(LPSTR)(LPCTSTR)strUIDMap, (char*)(LPSTR)(LPCTSTR)strUID);
strTemp = "TestMemoShare";
CWnd *pWnd=CWnd::FindWindow(NULL,strTemp);
pWnd->SendMessage(WM_IMGRETRIVED,0,0); //通过消息通知其他进程去读共享内存
UnmapViewOfFile(&strUIDMap);
CloseHandle(hmap);
}

这是读取内存信息：
HANDLE hmap;
CString str="";
hmap = ::OpenFileMapping(FILE_MAP_READ, FALSE, "DCMServMemoShare");
if (hmap != NULL)
{
str = (CString)(LPCTSTR)(LPSTR)(char*)::MapViewOfFile(
hmap, FILE_MAP_ALL_ACCESS, 0, 0, 0);
UnmapViewOfFile(&str);
CloseHandle(hmap);

AfxMessageBox(str);
}else{
int nError = GetLastError();
}
读出来的str是TestMemoShare程序的路径。

请高手指点。

[JLDelphi]

hmap = ::OpenFileMapping(FILE_MAP_READ, FALSE, "MemoShare");

写错了

[xiaodongdehome]

学习!

[handwolf]

出现了什么问题？说来听听

[sinall]

CWnd *pWnd=CWnd::FindWindow(NULL,strTemp);
pWnd->SendMessage(WM_IMGRETRIVED,0,0); //通过消息通知其他进程去读共享内存
UnmapViewOfFile(&strUIDMap);
CloseHandle(hmap);

TestMemoShare有没有时间去读取共享内存？

[sinall]

你的程序bug太多。我刚才改了下：
// MemoShare.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include "Afxwin.h"
#include <IOSTREAM>

int main(int argc, char* argv[])
{
HANDLE hmap;
hmap = ::CreateFileMapping((HANDLE)-1,NULL,PAGE_READWRITE,0,1024,_T("MemoShare"));
if(hmap != NULL)// && GetLastError() == ERROR_ALREADY_EXISTS
{
char *strUIDMap = (char*)::MapViewOfFile(hmap,FILE_MAP_WRITE,0,0,0);
char strUID[50]="hahaFAFADSF\0";
strcpy(strUIDMap, strUID);
Sleep(30000);
std::cout<<"UnmapViewOfFile"<<std::endl;
UnmapViewOfFile(&strUIDMap);
CloseHandle(hmap);
}

return 0;
}

// TestMemoShare.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include "Afxwin.h"
#include <IOSTREAM>

#define WM_IMGRETRIVED (WM_USER+1)

int main(int argc, char* argv[])
{
HANDLE hmap;
hmap = ::OpenFileMapping(FILE_MAP_READ, FALSE, "MemoShare");
if (hmap != NULL)
{
std::cout<<"Get string"<<std::endl;
char *str = (char*)::MapViewOfFile(
hmap, FILE_MAP_READ, 0, 0, 0);
std::cout<<str<<std::endl;
UnmapViewOfFile(&str);
CloseHandle(hmap);


}
else
{
int nError = GetLastError();
}

return 0;
}

[oyljerry]

根据错误修改
跟踪一下数据读写的过程