我正在尝试从原始磁盘读取字节。 (Windows 7、VS 2010。)
我得到的 hDisk 值为 -1(我认为这是一个错误)。
如何获取真实数据？
#include "stdafx.h"
#include <windows.h>
#include <WinIoCtl.h>
#include <stdio.h>
#include <iostream>
int _tmain(int argc, _TCHAR* argv[])
{
printf("hello world\n");
DWORD nRead;
char buf[512];
HANDLE hDisk = CreateFile(L"\\\\.\\PhysicalDrive0",
GENERIC_READ, FILE_SHARE_READ,
NULL, OPEN_EXISTING, 0, NULL);
printf("hDisk %i\n", hDisk);
SetFilePointer(hDisk, 0xA00, 0, FILE_BEGIN);
ReadFile(hDisk, buf, 512, &nRead, NULL);
for (int currentpos=0;currentpos < 512;currentpos++) {
std::cout << buf[currentpos];
}
CloseHandle(hDisk);
std::cin.get();
return 0;
}
最佳答案
我认为你的代码应该工作(当以提升的权限运行时)除了:
buf[] 未正确对齐。
物理驱动器 0 可能是系统驱动器，因此正在使用中。
这是我用于磁盘镜像的一些代码。 ( Previously posted here. ) 公共(public)领域，但没有明示或暗示的保证等。(查看代码我注意到我没有明确检查扇区大小以确保缓冲区和读/写操作正确对齐。这在实践中应该不是问题，因为常用的最大扇区大小是 4K，这也是 Windows 上的内存页面大小。但是，在生产代码中，您应该始终明确确定设备的扇区大小问题并相应地确保正确对齐。)
#define _WIN32_WINNT 0x0501
#include <windows.h>
#include <stdio.h>
#define dump_buffersize_megs 16
#define dump_buffersize (dump_buffersize_megs * 1024 * 1024)
#define dump_workingsetsize ((dump_buffersize_megs + 1) * 1024 * 1024)
DWORD save(const wchar_t * source_device_name, const wchar_t * filename) {
DWORD err;
HANDLE hdevice, houtput;
DWORD bytes_to_transfer, byte_count;
GET_LENGTH_INFORMATION source_disklength;
DISK_GEOMETRY source_diskgeometry;
LARGE_INTEGER offset;
OVERLAPPED overlapped;
BYTE * buffer;
if (!SetProcessWorkingSetSize(GetCurrentProcess(), dump_workingsetsize, dump_workingsetsize))
{
err = GetLastError();
printf("Error %u trying to expand working set.\n", err);
return err;
}
buffer = VirtualAlloc(NULL, dump_buffersize, MEM_COMMIT, PAGE_READWRITE);
if (buffer == NULL)
{
err = GetLastError();
printf("Error %u trying to allocate buffer.\n", err);
return err;
}
if (!VirtualLock(buffer, dump_buffersize))
{
err = GetLastError();
printf("Error %u trying to lock buffer.\n", err);
return err;
}
hdevice = CreateFile
(
source_device_name,
GENERIC_READ,
0,
NULL,
OPEN_EXISTING,
FILE_FLAG_NO_BUFFERING,
NULL
);
if (hdevice == INVALID_HANDLE_VALUE) {
err = GetLastError();
fprintf(stderr, "Error %u opening input device.\n", err);
return err;
}
if (!DeviceIoControl
(
hdevice,
FSCTL_LOCK_VOLUME,
NULL,
0,
NULL,
0,
&byte_count,
NULL
))
{
err = GetLastError();
fprintf(stderr, "Error %u locking input volume.\n", err);
return err;
}
if (!DeviceIoControl
(
hdevice,
IOCTL_DISK_GET_DRIVE_GEOMETRY,
NULL,
0,
&source_diskgeometry,
sizeof(source_diskgeometry),
&byte_count,
NULL
))
{
err = GetLastError();
fprintf(stderr, "Error %u getting device geometry.\n", err);
return err;
}
switch (source_diskgeometry.MediaType)
{
case Unknown:
case RemovableMedia:
case FixedMedia:
if (!DeviceIoControl
(
hdevice,
IOCTL_DISK_GET_LENGTH_INFO,
NULL,
0,
&source_disklength,
sizeof(source_disklength),
&byte_count,
NULL
))
{
err = GetLastError();
fprintf(stderr, "Error %u getting input device length.\n", err);
return err;
}
fprintf(stderr, "\nInput disk has %I64i bytes.\n\n", source_disklength.Length.QuadPart);
break;
default:
source_disklength.Length.QuadPart =
source_diskgeometry.Cylinders.QuadPart *
source_diskgeometry.TracksPerCylinder *
source_diskgeometry.SectorsPerTrack *
source_diskgeometry.BytesPerSector;
fprintf(stderr,
"\n"
"Input device appears to be a floppy disk. WARNING: if this is not a\n"
"floppy disk the calculated size will probably be incorrect, resulting\n"
"in an incomplete copy.\n"
"\n"
"Input disk has %I64i bytes.\n"
"\n",
source_disklength.Length.QuadPart);
break;
}
houtput = CreateFile
(
filename,
GENERIC_WRITE,
0,
NULL,
CREATE_ALWAYS,
FILE_FLAG_NO_BUFFERING | FILE_FLAG_OVERLAPPED,
NULL
);
if (houtput == INVALID_HANDLE_VALUE)
{
err = GetLastError();
fprintf(stderr, "Error %u creating output file.\n", err);
return err;
}
offset.QuadPart = 0;
overlapped.hEvent = 0;
for (;;)
{
overlapped.Offset = offset.LowPart;
overlapped.OffsetHigh = offset.HighPart;
if (source_disklength.Length.QuadPart - offset.QuadPart < dump_buffersize)
{
bytes_to_transfer = (DWORD)(source_disklength.Length.QuadPart - offset.QuadPart);
if (bytes_to_transfer == 0) break;
}
else
{
bytes_to_transfer = dump_buffersize;
}
if (!ReadFile(hdevice, buffer, bytes_to_transfer, NULL, &overlapped))
{
err = GetLastError();
printf("Error %u initiating read from input disk.\n", err);
return err;
}
if (!GetOverlappedResult(hdevice, &overlapped, &byte_count, TRUE))
{
err = GetLastError();
printf("Error %u reading from input disk.\n", err);
return err;
}
if (byte_count != bytes_to_transfer)
{
err = GetLastError();
printf("Internal error - partial read. Last error code %u.\n", err);
printf("bytes_to_transfer = %u; byte_count = %u.\n", bytes_to_transfer, byte_count);
if (byte_count == 0) return ERROR_INVALID_FUNCTION;
bytes_to_transfer = byte_count;
}
if (!WriteFile(houtput, buffer, bytes_to_transfer, NULL, &overlapped))
{
err = GetLastError();
if (err != ERROR_IO_PENDING)
{
printf("Error %u initiating write to output file.\n", err);
return err;
}
}
if (!GetOverlappedResult(houtput, &overlapped, &byte_count, TRUE))
{
err = GetLastError();
printf("Error %u writing to output file.\n", err);
return err;
}
if (byte_count != bytes_to_transfer)
{
printf("Internal error - partial write.\n");
printf("bytes_to_transfer = %u; byte_count = %u.\n", bytes_to_transfer, byte_count);
return ERROR_INVALID_FUNCTION;
}
offset.QuadPart += bytes_to_transfer;
}
overlapped.Offset = offset.LowPart;
overlapped.OffsetHigh = offset.HighPart;
if (!ReadFile(hdevice, buffer, source_diskgeometry.BytesPerSector, NULL, &overlapped))
{
err = GetLastError();
if (err == ERROR_HANDLE_EOF)
{
printf("Save successfully completed.\n");
return 0;
}
printf("Error %u initiating read from input disk past end of file.\n", err);
return err;
}
if (!GetOverlappedResult(hdevice, &overlapped, &byte_count, TRUE))
{
err = GetLastError();
if (err == ERROR_HANDLE_EOF)
{
printf("Save successfully completed.\n");
return 0;
}
printf("Error %u reading from input disk past end of file.\n", err);
return err;
}
if (byte_count == 0)
{
printf("Save successfully completed.\n");
return 0;
}
printf("WARNING: the expected amount of data was successfully copied,\n"
"but end of file not detected on input disk. The copy might\n"
"not be complete.");
return ERROR_MORE_DATA;
}
DWORD write(const wchar_t * filename, const wchar_t * target_device_name) {
DWORD err;
HANDLE hinput, houtput;
WIN32_FILE_ATTRIBUTE_DATA fad;
DWORD bytes_to_transfer, byte_count;
LARGE_INTEGER filelength;
GET_LENGTH_INFORMATION target_disklength;
DISK_GEOMETRY target_diskgeometry;
LARGE_INTEGER transfer_length;
LARGE_INTEGER offset;
OVERLAPPED overlapped;
BYTE * buffer;
if (!SetProcessWorkingSetSize(GetCurrentProcess(), dump_workingsetsize, dump_workingsetsize))
{
err = GetLastError();
printf("Error %u trying to expand working set.\n", err);
return err;
}
buffer = VirtualAlloc(NULL, dump_buffersize, MEM_COMMIT, PAGE_READWRITE);
if (buffer == NULL)
{
err = GetLastError();
printf("Error %u trying to allocate buffer.\n", err);
return err;
}
if (!VirtualLock(buffer, dump_buffersize))
{
err = GetLastError();
printf("Error %u trying to lock buffer.\n", err);
return err;
}
if (!GetFileAttributesEx(filename, GetFileExInfoStandard, &fad))
{
err = GetLastError();
fprintf(stderr, "Error %u reading input file attributes.\n", err);
return err;
}
filelength.HighPart = fad.nFileSizeHigh;
filelength.LowPart = fad.nFileSizeLow;
fprintf(stderr, "\nInput file has %I64i bytes.\n", filelength.QuadPart);
hinput = CreateFile
(
filename,
GENERIC_READ,
0,
NULL,
OPEN_EXISTING,
FILE_FLAG_NO_BUFFERING | FILE_FLAG_OVERLAPPED,
NULL
);
if (hinput == INVALID_HANDLE_VALUE)
{
err = GetLastError();
fprintf(stderr, "Error %u opening input file.\n", err);
return err;
}
houtput = CreateFile
(
target_device_name,
GENERIC_READ | GENERIC_WRITE,
0,
NULL,
OPEN_EXISTING,
FILE_FLAG_NO_BUFFERING,
NULL
);
if (houtput == INVALID_HANDLE_VALUE) {
err = GetLastError();
fprintf(stderr, "Error %u opening output device.\n", err);
return err;
}
if (!DeviceIoControl
(
houtput,
FSCTL_LOCK_VOLUME,
NULL,
0,
NULL,
0,
&byte_count,
NULL
))
{
err = GetLastError();
fprintf(stderr, "Error %u locking volume.\n", err);
return err;
}
if (!DeviceIoControl
(
houtput,
IOCTL_DISK_GET_DRIVE_GEOMETRY,
NULL,
0,
&target_diskgeometry,
sizeof(target_diskgeometry),
&byte_count,
NULL
))
{
err = GetLastError();
fprintf(stderr, "Error %u getting output device geometry.\n", err);
return err;
}
switch (target_diskgeometry.MediaType)
{
case Unknown:
case RemovableMedia:
case FixedMedia:
if (!DeviceIoControl
(
houtput,
IOCTL_DISK_GET_LENGTH_INFO,
NULL,
0,
&target_disklength,
sizeof(target_disklength),
&byte_count,
NULL
))
{
err = GetLastError();
fprintf(stderr, "Error %u getting output device length.\n", err);
return err;
}
fprintf(stderr, "Output disk has %I64i bytes.\n\n", target_disklength.Length.QuadPart);
break;
default:
target_disklength.Length.QuadPart =
target_diskgeometry.Cylinders.QuadPart *
target_diskgeometry.TracksPerCylinder *
target_diskgeometry.SectorsPerTrack *
target_diskgeometry.BytesPerSector;
fprintf(stderr,
"\n"
"Output device appears to be a floppy disk. WARNING: if this is not a\n"
"floppy disk the calculated output device size is probably incorrect,\n"
"which might result in an incomplete copy.\n"
"\n"
"Output disk has %I64i bytes.\n"
"\n",
target_disklength.Length.QuadPart);
break;
}
if (filelength.QuadPart == target_disklength.Length.QuadPart)
{
transfer_length.QuadPart = filelength.QuadPart;
}
else if (filelength.QuadPart < target_disklength.Length.QuadPart)
{
fprintf(stderr, "Image is smaller than target. Part of the target will not be written to.\n\n");
transfer_length.QuadPart = filelength.QuadPart;
}
else
{
fprintf(stderr, "Image is larger than target. Part of the image will not be copied.\n\n");
transfer_length.QuadPart = target_disklength.Length.QuadPart;
}
offset.QuadPart = 0;
overlapped.hEvent = 0;
for (;;)
{
overlapped.Offset = offset.LowPart;
overlapped.OffsetHigh = offset.HighPart;
if (transfer_length.QuadPart - offset.QuadPart < dump_buffersize)
{
bytes_to_transfer = (DWORD)(transfer_length.QuadPart - offset.QuadPart);
if (bytes_to_transfer == 0) break;
}
else
{
bytes_to_transfer = dump_buffersize;
}
if (!ReadFile(hinput, buffer, bytes_to_transfer, NULL, &overlapped))
{
err = GetLastError();
if (err != ERROR_IO_PENDING)
{
printf("Error %u initiating read from input file.\n", err);
return err;
}
}
if (!GetOverlappedResult(hinput, &overlapped, &byte_count, TRUE))
{
err = GetLastError();
printf("Error %u reading from input file.\n", err);
return err;
}
if (byte_count != bytes_to_transfer)
{
err = GetLastError();
printf("Internal error - partial read. Last error code %u.\n", err);
printf("bytes_to_transfer = %u; byte_count = %u.\n", bytes_to_transfer, byte_count);
if (byte_count == 0) return ERROR_INVALID_FUNCTION;
bytes_to_transfer = byte_count;
}
if (!WriteFile(houtput, buffer, bytes_to_transfer, NULL, &overlapped))
{
err = GetLastError();
if (err != ERROR_IO_PENDING)
{
printf("Error %u initiating write to output disk.\n", err);
return err;
}
}
if (!GetOverlappedResult(houtput, &overlapped, &byte_count, TRUE))
{
err = GetLastError();
printf("Error %u writing to output disk.\n", err);
return err;
}
if (byte_count != bytes_to_transfer)
{
printf("Internal error - partial write.\n");
printf("bytes_to_transfer = %u; byte_count = %u.\n", bytes_to_transfer, byte_count);
return ERROR_INVALID_FUNCTION;
}
offset.QuadPart += bytes_to_transfer;
}
printf("Write successfully completed.\n");
return 0;
}
DWORD clone(const wchar_t * source_device_name, const wchar_t * target_device_name) {
DWORD err;
HANDLE hinput, houtput;
DWORD bytes_to_transfer, byte_count;
GET_LENGTH_INFORMATION source_disklength;
DISK_GEOMETRY source_diskgeometry;
GET_LENGTH_INFORMATION target_disklength;
DISK_GEOMETRY target_diskgeometry;
LARGE_INTEGER transfer_length;
LARGE_INTEGER offset;
OVERLAPPED overlapped;
BYTE * buffer;
DWORD result;
if (!SetProcessWorkingSetSize(GetCurrentProcess(), dump_workingsetsize, dump_workingsetsize))
{
err = GetLastError();
printf("Error %u trying to expand working set.\n", err);
return err;
}
buffer = VirtualAlloc(NULL, dump_buffersize, MEM_COMMIT, PAGE_READWRITE);
if (buffer == NULL)
{
err = GetLastError();
printf("Error %u trying to allocate buffer.\n", err);
return err;
}
if (!VirtualLock(buffer, dump_buffersize))
{
err = GetLastError();
printf("Error %u trying to lock buffer.\n", err);
return err;
}
hinput = CreateFile
(
source_device_name,
GENERIC_READ,
0,
NULL,
OPEN_EXISTING,
FILE_FLAG_NO_BUFFERING,
NULL
);
if (hinput == INVALID_HANDLE_VALUE) {
err = GetLastError();
fprintf(stderr, "Error %u opening input device.\n", err);
return err;
}
if (!DeviceIoControl
(
hinput,
FSCTL_LOCK_VOLUME,
NULL,
0,
NULL,
0,
&byte_count,
NULL
))
{
err = GetLastError();
fprintf(stderr, "Error %u locking input volume.\n", err);
return err;
}
if (!DeviceIoControl
(
hinput,
IOCTL_DISK_GET_DRIVE_GEOMETRY,
NULL,
0,
&source_diskgeometry,
sizeof(source_diskgeometry),
&byte_count,
NULL
))
{
err = GetLastError();
fprintf(stderr, "Error %u getting device geometry.\n", err);
return err;
}
switch (source_diskgeometry.MediaType)
{
case Unknown:
case RemovableMedia:
case FixedMedia:
if (!DeviceIoControl
(
hinput,
IOCTL_DISK_GET_LENGTH_INFO,
NULL,
0,
&source_disklength,
sizeof(source_disklength),
&byte_count,
NULL
))
{
err = GetLastError();
fprintf(stderr, "Error %u getting input device length.\n", err);
return err;
}
fprintf(stderr, "\nInput disk has %I64i bytes.\n", source_disklength.Length.QuadPart);
break;
default:
source_disklength.Length.QuadPart =
source_diskgeometry.Cylinders.QuadPart *
source_diskgeometry.TracksPerCylinder *
source_diskgeometry.SectorsPerTrack *
source_diskgeometry.BytesPerSector;
fprintf(stderr,
"\n"
"Input device appears to be a floppy disk. WARNING: if this is not a\n"
"floppy disk the calculated disk size is probably incorrect, resulting\n"
"in an incomplete copy.\n"
"\n"
"Input disk has %I64i bytes.\n",
source_disklength.Length.QuadPart);
break;
}
houtput = CreateFile
(
target_device_name,
GENERIC_READ | GENERIC_WRITE,
0,
NULL,
OPEN_EXISTING,
FILE_FLAG_NO_BUFFERING,
NULL
);
if (houtput == INVALID_HANDLE_VALUE) {
err = GetLastError();
fprintf(stderr, "Error %u opening output device.\n", err);
return err;
}
if (!DeviceIoControl
(
houtput,
FSCTL_LOCK_VOLUME,
NULL,
0,
NULL,
0,
&byte_count,
NULL
))
{
err = GetLastError();
fprintf(stderr, "Error %u locking output volume.\n", err);
return err;
}
if (!DeviceIoControl
(
houtput,
IOCTL_DISK_GET_DRIVE_GEOMETRY,
NULL,
0,
&target_diskgeometry,
sizeof(target_diskgeometry),
&byte_count,
NULL
))
{
err = GetLastError();
fprintf(stderr, "Error %u getting output device geometry.\n", err);
return err;
}
switch (target_diskgeometry.MediaType)
{
case Unknown:
case RemovableMedia:
case FixedMedia:
if (!DeviceIoControl
(
houtput,
IOCTL_DISK_GET_LENGTH_INFO,
NULL,
0,
&target_disklength,
sizeof(target_disklength),
&byte_count,
NULL
))
{
err = GetLastError();
fprintf(stderr, "Error %u getting output device length.\n", err);
return err;
}
fprintf(stderr, "Output disk has %I64i bytes.\n\n", target_disklength.Length.QuadPart);
break;
default:
target_disklength.Length.QuadPart =
target_diskgeometry.Cylinders.QuadPart *
target_diskgeometry.TracksPerCylinder *
target_diskgeometry.SectorsPerTrack *
target_diskgeometry.BytesPerSector;
fprintf(stderr,
"\n"
"Output device appears to be a floppy disk. WARNING: if this is not a\n"
"floppy disk the calculated output device size is probably incorrect,\n"
"which might result in an incomplete copy.\n"
"\n"
"Output disk has %I64i bytes.\n"
"\n",
target_disklength.Length.QuadPart);
break;
}
if (source_disklength.Length.QuadPart == target_disklength.Length.QuadPart)
{
transfer_length.QuadPart = source_disklength.Length.QuadPart;
}
else if (source_disklength.Length.QuadPart < target_disklength.Length.QuadPart)
{
printf("Input shorter than output. Part of the output disk will not be written to.\n\n");
transfer_length.QuadPart = source_disklength.Length.QuadPart;
}
else
{
printf("Output shorter than input. Copy will be truncated to output length.\n\n");
transfer_length.QuadPart = target_disklength.Length.QuadPart;
}
offset.QuadPart = 0;
overlapped.hEvent = 0;
for (;;)
{
overlapped.Offset = offset.LowPart;
overlapped.OffsetHigh = offset.HighPart;
if (transfer_length.QuadPart - offset.QuadPart < dump_buffersize)
{
bytes_to_transfer = (DWORD)(transfer_length.QuadPart - offset.QuadPart);
if (bytes_to_transfer == 0) break;
}
else
{
bytes_to_transfer = dump_buffersize;
}
if (!ReadFile(hinput, buffer, bytes_to_transfer, NULL, &overlapped))
{
err = GetLastError();
printf("Error %u initiating read from input file.\n", err);
return err;
}
if (!GetOverlappedResult(hinput, &overlapped, &byte_count, TRUE))
{
err = GetLastError();
printf("Error %u reading from input file.\n", err);
return err;
}
if (byte_count != bytes_to_transfer)
{
err = GetLastError();
printf("Internal error - partial read. Last error code %u.\n", err);
printf("bytes_to_transfer = %u; byte_count = %u.\n", bytes_to_transfer, byte_count);
if (byte_count == 0) return ERROR_INVALID_FUNCTION;
bytes_to_transfer = byte_count;
}
if (!WriteFile(houtput, buffer, bytes_to_transfer, NULL, &overlapped))
{
err = GetLastError();
if (err != ERROR_IO_PENDING)
{
printf("Error %u initiating write to output disk.\n", err);
return err;
}
}
if (!GetOverlappedResult(houtput, &overlapped, &byte_count, TRUE))
{
err = GetLastError();
printf("Error %u writing to output disk.\n", err);
return err;
}
if (byte_count != bytes_to_transfer)
{
printf("Internal error - partial write.\n");
printf("bytes_to_transfer = %u; byte_count = %u.\n", bytes_to_transfer, byte_count);
return ERROR_INVALID_FUNCTION;
}
offset.QuadPart += bytes_to_transfer;
}
if (transfer_length.QuadPart == source_disklength.Length.QuadPart)
{
overlapped.Offset = offset.LowPart;
overlapped.OffsetHigh = offset.HighPart;
if (!ReadFile(hinput, buffer, source_diskgeometry.BytesPerSector, NULL, &overlapped))
{
err = GetLastError();
if (err == ERROR_HANDLE_EOF)
{
printf("Copy successfully completed.\n");
return 0;
}
printf("Error %u initiating read from input disk past end of file.\n", err);
return err;
}
if (!GetOverlappedResult(hinput, &overlapped, &byte_count, TRUE))
{
err = GetLastError();
if (err == ERROR_HANDLE_EOF)
{
printf("Copy successfully completed.\n");
return 0;
}
printf("Error %u reading from input disk past end of file.\n", err);
return err;
}
if (byte_count == 0)
{
printf("Copy successfully completed.\n");
return 0;
}
printf("WARNING: the expected amount of data was successfully copied,\n"
"but end of file not detected on input disk. The copy might\n"
"not be complete.");
result = ERROR_MORE_DATA;
return 0;
}
printf("Copy successfully completed.\n");
return 0;
}
int wmain(int argc, wchar_t ** argv)
{
if (argc < 4)
{
printf("Syntax: \n"
"To save an image of a physical drive:\n"
"diskimage /save \\\\.\\PhysicalDrive0 file.img\n"
"diskimage /save \\\\.\\A: file.img\n"
"To write from an image file to a physical drive:\n"
"diskimage /write file.img \\\\.\\PhysicalDrive0\n"
"diskimage /write file.img \\\\.\\A:\n"
"To clone input drive 0 to output drive 1:\n"
"diskimage /clone \\\\.\\PhysicalDrive0 \\\\.\\PhysicalDrive1\n"
);
return 1;
}
if (_wcsicmp(argv[1], L"/save") == 0)
{
return save(argv[2], argv[3]);
}
else if (_wcsicmp(argv[1], L"/write") == 0)
{
return write(argv[2], argv[3]);
}
else if (_wcsicmp(argv[1], L"/clone") == 0)
{
return clone(argv[2], argv[3]);
}
else
{
printf("Invalid argument. Use /? for syntax help.\n");
return 1;
}
}
关于c++ - Windows，打开原始磁盘，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/27063419/
我需要在客户计算机上运行Ruby应用程序。通常需要几天才能完成(复制大备份文件)。问题是如果启用sleep，它会中断应用程序。否则，计算机将持续运行数周，直到我下次访问为止。有什么方法可以防止执行期间休眠并让Windows在执行后休眠吗？欢迎任何疯狂的想法;-) 最佳答案 Here建议使用SetThreadExecutionStateWinAPI函数，使应用程序能够通知系统它正在使用中，从而防止系统在应用程序运行时进入休眠状态或关闭显示。像这样的东西:require'Win32API'ES_AWAYMODE_REQUIRED=0x0
使用带有Rails插件的vim，您可以创建一个迁移文件，然后一次性打开该文件吗？textmate也可以这样吗？ 最佳答案 你可以使用rails.vim然后做类似的事情::Rgeneratemigratonadd_foo_to_bar插件将打开迁移生成的文件，这正是您想要的。我不能代表textmate。 关于ruby-使用VimRails，您可以创建一个新的迁移文件并一次性打开它吗？，我们在StackOverflow上找到一个类似的问题： https://sta
我的瘦服务器配置了nginx，我的ROR应用程序正在它们上运行。在我发布代码更新时运行thinrestart会给我的应用程序带来一些停机时间。我试图弄清楚如何优雅地重启正在运行的Thin实例，但找不到好的解决方案。有没有人能做到这一点？ 最佳答案 #Restartjustthethinserverdescribedbythatconfigsudothin-C/etc/thin/mysite.ymlrestartNginx将继续运行并代理请求。如果您将Nginx设置为使用多个上游服务器，例如server{listen80;server
这似乎非常适得其反，因为太多的gem会在window上破裂。我一直在处理很多mysql和ruby-mysqlgem问题(gem本身发生段错误，一个名为UnixSocket的类显然在Windows机器上不能正常工作，等等)。我只是在浪费时间吗？我应该转向不同的脚本语言吗？ 最佳答案 我在Windows上使用Ruby的经验很少，但是当我开始使用Ruby时，我是在Windows上，我的总体印象是它不是Windows原生系统。因此，在主要使用Windows多年之后，开始使用Ruby促使我切换回原来的系统Unix，这次是Linux。Rub
如何将send与+=一起使用？a=20;a.send"+=",10undefinedmethod`+='for20:Fixnuma=20;a+=10=>30 最佳答案 恐怕你不能。+=不是方法，而是语法糖。参见http://www.ruby-doc.org/docs/ProgrammingRuby/html/tut_expressions.html它说Incommonwithmanyotherlanguages,Rubyhasasyntacticshortcut:a=a+2maybewrittenasa+=2.你能做的最好的事情是:
之前在培训新生的时候，windows环境下配置opencv环境一直教的都是网上主流的vsstudio配置属性表，但是这个似乎对新生来说难度略高(虽然个人觉得完全是他们自己的问题)，加之暑假之后对cmake实在是爱不释手，且这样配置确实十分简单(其实都不需要配置)，故斗胆妄言vscode下配置CV之法。其实极为简单，图比较多所以很长。如果你看此文还配不好，你应该思考一下是不是自己的问题。闲话少说，直接开始。0.CMkae简介有的人到大二了都不知道cmake是什么，我不说是谁。CMake是一个开源免费并且跨平台的构建工具，可以用简单的语句来描述所有平台的编译过程。它能够根据当前所在平台输出对应的m
深度学习部署：Windows安装pycocotools报错解决方法1.pycocotools库的简介2.pycocotools安装的坑3.解决办法更多Ai资讯：公主号AiCharm本系列是作者在跑一些深度学习实例时，遇到的各种各样的问题及解决办法，希望能够帮助到大家。ERROR:Commanderroredoutwithexitstatus1:'D:\Anaconda3\python.exe'-u-c'importsys,setuptools,tokenize;sys.argv[0]='"'"'C:\\Users\\46653\\AppData\\Local\\Temp\\pip-instal
我对如何计算通过{%assignvar=0%}赋值的变量加一完全感到困惑。这应该是最简单的任务。到目前为止，这是我尝试过的:{%assignamount=0%}{%forvariantinproduct.variants%}{%assignamount=amount+1%}{%endfor%}Amount:{{amount}}结果总是0。也许我忽略了一些明显的东西。也许有更好的方法。我想要存档的只是获取运行的迭代次数。 最佳答案 因为{{incrementamount}}将输出您的变量值并且不会影响{%assign%}定义的变量，我
我有这个代码File.open(file_name,'r'){|file|file.read}但是Rubocop发出警告:Offenses:Style/SymbolProc:Pass&:readasargumenttoopeninsteadofablock.你是怎么做到的？ 最佳答案 我刚刚创建了一个名为“t.txt”的文件，其中包含“Hello,World\n”。我们可以按如下方式阅读。File.open('t.txt','r',&:read)#=>"Hello,World\n"顺便说一下，由于第二个参数的默认值是'r'，所以这样
我正在为个人笔记创建一个日志应用程序，并且在我的Rakefile中包含以下内容:task:newdoentry_name="Entries/#{Time.now.to_s.gsub(/[-\:]+/,'.').gsub(/.0500+/,'')}.md"`touch#{entry_name}``echo"#$(date)">>#{entry_name}`end我想包括的最后一部分是Vim文本编辑器的打开，但我不知道如何打开它，就像我直接从bash终端调用它一样。我试过:vim#{entry_name}但不幸的是，我认为它们都将其作为后台进程打开。我一直在引用“6WaystoRunShe