我遇到的問題:CreateFile返回一個0x194的句柄。 ReadFileEx說這個句柄是無效的。 (錯誤6.)任何想法?傳入的參數是「C:\ testfile.txt」,這是我在記事本中創建的有效文本文件。儘管是過去12年來的C++程序員,但這是我第一次用「windows.h」或線程編寫任何東西。從ReadFileEx使用CreateFile的有效句柄無效的句柄錯誤
#include "stdafx.h"
#include "stdio.h"
#include "windows.h"
using namespace System;
int main(int argc, char **argv)
{
if (argc != 2)
{
printf("To display a file, you must enter the filename as the only command argument.");
scanf("\n");
return 0;
}
HANDLE file;
int nameLen = (strlen(argv[1]) + 1);
wchar_t *filename = new wchar_t[nameLen];
if (filename == 0)
{
printf("To display a file, you must enter the filename as the only command argument.");
scanf("\n");
return 0;
}
memset(filename, 0, nameLen);
::MultiByteToWideChar(CP_ACP, NULL, argv[1], -1, filename, nameLen);
file = CreateFile(filename, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
if (file == NULL)
{
printf("A valid filename is required.");
scanf("\n");
return 0;
}
char *buffer;
buffer = new char[1024];
OVERLAPPED overlapped;
overlapped.Offset = overlapped.OffsetHigh = 0;
ReadFileEx(file, &buffer, 1024, &overlapped, NULL);
WaitForSingleObject(&file, 0);
if (GetLastError() != ERROR_SUCCESS)
{
printf("A valid file is required., Error: %d", GetLastError());
scanf("\n");
return 0;
}
printf("%s", buffer);
scanf("\n");
delete buffer;
return 0;
}
它抱怨未初始化overlapped.hEvent。 –