无法创建句柄，或句柄无效-WinAPI（CreateFile）

这是我的一段代码：

    #include <stdio.h>
    #include <windows.h>
    #include <iostream.h>
    #include <signal.h>
    #include <tchar.h>
    #include <stdarg.h>

    int main(int argc, char * agrv[]) {

        //Convert argument 2 to wide char pointer
        wchar_t w[MAX_PATH];
        size_t size_of_w = sizeof(w);
        mbstowcs_s(&size_of_w, w, argv[1], MAX_PATH);
        LPWSTR pFile = w;

        //Copy original file to temp file
        if (!CopyFile(w, L"temp.out", False))
        {
            printf("Error: could not copy file.");
            printf("CopyFile Errorcode %d\n", GetLastError());
            return 1;
        }
        pFile = L"temp.out";

        HANDLE hFile = CreateFile(pFile, GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);

        if (hFile == INVALID_HANDLE_VALUE)
        {
            printf("Error: could not create handle to file");
            printf("CreateFile Errorcode %d\n", GetLastError());
            return 1;
        }
        printf("Successfully created Handle");
        return 0;
    }

编辑2:

我在CopyFile中添加了错误处理，但它可以正常工作并复制文件。 现在输出为：

program.exe.txt 已成功创建句柄 错误：无法将文件映射到内存 createMapFile错误代码：6

没有<代码> <代码>，考虑使用一个新的编译器！ 您可以使用

wmain

来避免字符串转换。虽然您并不真正需要它，也不需要创建文件。使用

无效的\u句柄\u值

而不是

hFile

#include <iostream>
#include "windows.h"

int wmain(int argc, wchar_t* argv[])
{
    const int buflen = 1000;
    wchar_t* mapName = L"MyMapName";
    wchar_t* message = L"123\0";

    HANDLE hFileMapping = CreateFileMapping(INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE, 0, buflen, mapName);
    if (!hFileMapping)
    {
        printf("CreateFileMapping error %d\n", GetLastError());
        return 1;
    }

    LPVOID buf = MapViewOfFile(hFileMapping, FILE_MAP_ALL_ACCESS, 0, 0, buflen);
    if (!buf)
    {
        printf("MapViewOfFile error %d\n", GetLastError());
        CloseHandle(hFileMapping);
        return 1;
    }
    CopyMemory(buf, message, (wcslen(message) * sizeof(wchar_t)));
    system("pause");//wait until another program reads this data
    UnmapViewOfFile(buf);
    CloseHandle(hFileMapping);
    return 0;
}

---

目录必须退出。您在错误的时间调用了

GetLastError

。如果函数失败，则特别注意调用

GetLastError

。你在无条件地调用它。我想知道为什么这么多人会犯这个基本错误。@johnnybravo，除非

CreateFile

返回

INVALID\u HANDLE\u VALUE

你没有错误要处理。在下一个函数中，你也在做同样的事情（实际上，代码甚至不会如图所示编译）。除非出现故障，否则不要调用GETLASTERROR（）。

#include <iostream>
#include "windows.h"

int wmain(int argc, wchar_t* argv[])
{
    const int buflen = 1000;
    wchar_t* mapName = L"MyMapName";
    wchar_t* message = L"123\0";

    HANDLE hFileMapping = CreateFileMapping(INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE, 0, buflen, mapName);
    if (!hFileMapping)
    {
        printf("CreateFileMapping error %d\n", GetLastError());
        return 1;
    }

    LPVOID buf = MapViewOfFile(hFileMapping, FILE_MAP_ALL_ACCESS, 0, 0, buflen);
    if (!buf)
    {
        printf("MapViewOfFile error %d\n", GetLastError());
        CloseHandle(hFileMapping);
        return 1;
    }
    CopyMemory(buf, message, (wcslen(message) * sizeof(wchar_t)));
    system("pause");//wait until another program reads this data
    UnmapViewOfFile(buf);
    CloseHandle(hFileMapping);
    return 0;
}

int wmain()
{
    const int buflen = 1000;
    wchar_t* mapName = L"MyMapName";
    HANDLE hMapFile = OpenFileMapping(FILE_MAP_ALL_ACCESS, FALSE, mapName);
    if (!hMapFile)
    {
        DWORD e = GetLastError();
        printf("OpenFileMapping %d\n", e);//EDITED: this line was missing
        return 1;
    }

    wchar_t* buf = (wchar_t*)MapViewOfFile(hMapFile, FILE_MAP_ALL_ACCESS, 0, 0, buflen);
    if (!pBuf)
    {
        DWORD e = GetLastError();    
        printf("MapViewOfFileerror %d\n", e);//EDITED: this line was missing
        CloseHandle(hMapFile);
        return 1;
    }
    wcout << buf << endl;
    UnmapViewOfFile(buf);
    CloseHandle(hMapFile);
    return 0;
}