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;
}
我试图为新复制的文件&#34; temp.out&#34;打开一个句柄,但是会抛出一个错误而且它不起作用。
我的调试打印(printf("CreateFile Errorcode %d\n", GetLastError());
)
打印&#34; CreateFile错误代码:2&#34; (找不到文件)但是发现它,因为CopyFile效果很好。
修改 我现在使用绝对路径,当我尝试使用句柄将文件映射到内存时,它会抛出“6”,这意味着句柄无效:
HANDLE pMap = CreateFileMapping(hFile, NULL, PAGE_EXECUTE_READWRITE,0 ,0 ,NULL);
LPVOID lpBase MapViewOfFile(pMap, FILE_MAP_ACCESS| FILE_MAP_EXECUTE, 0, 0, 0);
printf("CreateFileMapping Errorcode %d\n", GetLastError());
if (!lpBase)
{
printf("Error: could not map file to memory");
printf("CreateFileMapping Errorcode %d\n", GetLastError());
return 1;
}
printf("Successfully mapped file");
编辑2:
我已经将错误处理添加到CopyFile,但它工作正常并且可以复制文件。 输出现在是:
program.exe shit.txt 成功创建了Handle 错误:无法将文件映射到内存 createMapFile错误代码:6
答案 0 :(得分:0)
没有<iostream.h>
,请考虑使用新的编译器!
您可以使用wmain
来避免字符串转换。虽然您并不真的需要它,但您不需要创建文件。使用INVALID_HANDLE_VALUE
代替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;
}
如果您使用真实文件句柄而不是INVALID_HANDLE_VALUE
,请改用此方法(注意,buflen
为零):
CreateFileMapping(hFile, NULL, PAGE_READWRITE, 0, 0, mapName);
在另一个程序中:
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;
}