Question

我一直在审查Pavel Yosifovich的书籍和录像。我试图写出一个纯粹的C方案,它制造了一种ker子,并且允许一个案文从一个过程到另一个过程。我的代码如下,但出于某种原因,读到数据的方案总是要求开放式打字,最后错误是2,没有发现。我跑了温和派,我的共有主题在两场会议中显示。我并不认为这是一个安全问题,因为没有发现错误,我试图将来源改变为当地货币共同交易,但这没有改变。我也试图在行政指挥中迅速行动,但至今没有工作。似乎像现在这样说的是没有找到档案,所以它就成了一条路。下面是两个方案的准则。

#include <windows.h>
#include <stdio.h>
#include <string.h>

int main() {
    HANDLE hFileMapping;
    LPVOID lpFileMap;
    char buffer[] = "Windows System Programming is fun!";

    hFileMapping = CreateFileMapping(
        INVALID_HANDLE_VALUE,
        NULL,
        PAGE_READWRITE,
        0,
        sizeof(buffer),
        L"MySharedMemory"
        );

    if (hFileMapping == NULL) {
        printf("Error creating file mapping: %d
", GetLastError());
        return 1;
    }

    lpFileMap = MapViewOfFile(hFileMapping, FILE_MAP_WRITE, 0, 0, 0);

    if (lpFileMap == NULL) {
        printf("Error mapping view of file: %d
", GetLastError());
        CloseHandle(hFileMapping);
        return 1;
    }

    strcpy((char*)lpFileMap, buffer);
    printf("Data written to shared memory.  Press Enter to exit...
");
    getchar();
    UnmapViewOfFile(lpFileMap);
    CloseHandle(hFileMapping);
    return 0;
}

Consumer

#include <windows.h>
#include <stdio.h>

int main() {
    HANDLE hFileMapping;
    LPVOID lpFileMap;

    hFileMapping = OpenFileMapping(
        FILE_MAP_READ,
        FALSE,
        L"MySharedMemory"
        );

    if (hFileMapping == NULL) {
        printf("Error opening file mapping: %d
", GetLastError());
        getchar();
        return 1;
        
    }

    lpFileMap = MapViewOfFile(
        hFileMapping,
        FILE_MAP_READ,
        0,
        0,
        0,
        0
        );

    if (lpFileMap == NULL) {
        printf("Error mapping view of file: %d
", GetLastError());
        CloseHandle(hFileMapping);
        getchar();
        return 1;
    }

    printf("Received message: %s
", (char*)lpFileMap);
    UnmapViewOfFile(lpFileMap);
    getchar();
    CloseHandle(hFileMapping);
    return 0;
}

最新法典,但仍未奏效。

#include <windows.h>
#include <stdio.h>
#include <string.h>

int main() {
    HANDLE hFileMapping;
    LPVOID lpFileMap;
    char buffer[] = "Windows System Programming is fun!";

    hFileMapping = CreateFileMapping(
        INVALID_HANDLE_VALUE,
        NULL,
        PAGE_READWRITE,
        0,
        1 << 12,
        L"MySharedMemory"
        );

    if (hFileMapping == NULL) {
        printf("Error creating file mapping: %d
", GetLastError());
        return 1;
    }

    lpFileMap = MapViewOfFile(hFileMapping, FILE_MAP_WRITE, 0, 0, 0);

    if (lpFileMap == NULL) {
        printf("Error mapping view of file: %d
", GetLastError());
        CloseHandle(hFileMapping);
        return 1;
    }

    strcpy((char*)lpFileMap, buffer);
    printf("Data written to shared memory.  Press Enter to exit...
");
    getchar();
    UnmapViewOfFile(lpFileMap);
    CloseHandle(hFileMapping);
    return 0;
}




#include <windows.h>
#include <stdio.h>

int main() {
    HANDLE hFileMapping;
    LPVOID lpFileMap;

    //hFileMapping = OpenFileMapping(
    //  FILE_MAP_READ,
    //  FALSE,
    //  L"MySharedMemory"
    //  );

    hFileMapping = CreateFileMapping(
        INVALID_HANDLE_VALUE,
        NULL,
        PAGE_READWRITE,
        0,
        1 << 12,
        L"MySharedMemory"
        );

    if (hFileMapping == NULL) {
        printf("Error opening file mapping: %d
", GetLastError());
        getchar();
        return 1;
        
    }

    lpFileMap = MapViewOfFile(
        hFileMapping,
        FILE_MAP_READ,
        0,
        0,
        1 << 12
        );

    if (lpFileMap == NULL) {
        printf("Error mapping view of file: %d
", GetLastError());
        CloseHandle(hFileMapping);
        getchar();
        return 1;
    }

    printf("Received message: %s
", (char*)lpFileMap);
    UnmapViewOfFile(lpFileMap);
    getchar();
    CloseHandle(hFileMapping);
    return 0;
}

Answer 1

如Martin Rosenau所述,利用统法协会的密码功能明确解决这一问题。

The function has a Unicode variant(ending with W): CreateFileMappingW().

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