For the past 3 hours or so I've been attempting to send keyboard input by writing to the keyboard device. I have successfully found and opened the keyboard device, but I'm stuck at the final step. I don't know exactly how to format the DeviceIoControl parameters and I don't really know where to start getting the values.
Currently I have the following taken partly from a library called Interception posted in another answer here. I left out all the device opening stuff to save space.
#define IOCTL_WRITE CTL_CODE(FILE_DEVICE_UNKNOWN, 0x820, METHOD_BUFFERED, FILE_ANY_ACCESS)
if(device != INVALID_HANDLE_VALUE) {
DWORD dwReturned;
KEYBOARD_INPUT_DATA kbinput;
kbinput.UnitId = 0;
kbinput.MakeCode = 0x2D;
kbinput.Flags = KEY_MAKE;
kbinput.Reserved = 0;
kbinput.ExtraInformation = 0;
DeviceIoControl(device, IOCTL_WRITE, &kbinput, sizeof(KEYBOARD_INPUT_DATA), NULL, 0, &dwReturned, NULL);
kbinput.Flags = KEY_BREAK;
DeviceIoControl(device, IOCTL_WRITE, &kbinput, sizeof(KEYBOARD_INPUT_DATA), NULL, 0, &dwReturned, NULL);
}
If I call GetLastError after the DeviceIoControl calls I get a return value of ERROR_INVALID_FUNCTION(1). I assume that means IOCTL_WRITE isn't the correct value, but I haven't the faintest idea on how to find the correct value and no amount of searching has gotten me any further.
Related
I am trying to get the Channel using the windows API. So far, I have tried to use the wlan_intf_opcode_channel_number with the WlanQueryInterface function.
I am not too sure what the reply means on that thread and was hoping someone could clarify.
ULONG channel = 0;
DWORD dwSizeChannel = sizeof(channel);
dwResult = WlanQueryInterface(
hClient,
InterfaceGuid,
wlan_intf_opcode_channel_number,
NULL,
&dwSizeChannel,
(PVOID*)&channel,
NULL);
I am not sure what to do after here. Any help would be appreciated!
After checking i found out that i always get the same value as channel has befor calling the WlanQueryInterface
The MS docs for the op-code seems to be wrong. If you try something similar here:
ULONG *channel = NULL;
DWORD dwSizeChannel = sizeof(*channel);
DWORD rc = WlanQueryInterface (
hClient, InterfaceGuid,
wlan_intf_opcode_channel_number,
NULL, &dwSizeChannel, &channel, NULL);
if (rc == ERROR_SUCCESS && channel) {
printf ("Channel: %lu\n", *channel):
WlanFreeMemory (channel);
}
I do get the expected Channel: 5.
The same goes for wlan_intf_opcode_current_operation_mode and possibly other op-codes that's simply an ULONG.
I tried out WlanQueryInterface with the inputs from the documentation:
https://msdn.microsoft.com/en-us/library/windows/desktop/ms706765(v=vs.85).aspx
When query based on "wlan_intf_opcode_channel_number" was triggered, I got the data as "13". And the frequency could be made out as 2472Mhz from the WLAN information provided by the following wikipedia link:
https://en.wikipedia.org/wiki/List_of_WLAN_channels
Hope this helps.
I am trying to open a com port for reading and writing using C++ but I can't seem to pass the first stage of actually opening it. I get an INVALID_HANDLE_VALUE on the handle
with GetLastError FILE_NOT_FOUND. I have searched around the web for a couple of days I'm fresh out of ideas. I have searched through all the questions regarding COM on this website too.
I have scanned through the existing ports (or so I believe) to get the name of the port right.
I also tried combinations of _T("COM1") with the slashes, without the slashes, with colon, without colon and without the _T
I'm using windows 7 on 64 bit machine.
this is the code i got
I'll be glad for any input on this
void SendToCom(char* data, int len)
{
DWORD cbNeeded = 0;
DWORD dwPorts = 0;
EnumPorts(NULL, 1, NULL, 0, &cbNeeded, &dwPorts);
//What will be the return value
BOOL bSuccess = FALSE;
LPCSTR COM1 ;
BYTE* pPorts = static_cast<BYTE*>(malloc(cbNeeded));
bSuccess = EnumPorts(NULL, 1, pPorts, cbNeeded, &cbNeeded, &dwPorts);
if (bSuccess){
PORT_INFO_1* pPortInfo = reinterpret_cast<PORT_INFO_1*>(pPorts);
for (DWORD i=0; i<dwPorts; i++)
{
//If it looks like "COMX" then
size_t nLen = _tcslen(pPortInfo->pName);
if (nLen > 3)
{
if ((_tcsnicmp(pPortInfo->pName, _T("COM"), 3) == 0) ){
COM1 =pPortInfo->pName;
//COM1 ="\\\\.\\COM1";
HANDLE m_hCommPort = CreateFile( COM1 ,
GENERIC_READ|GENERIC_WRITE, // access ( read and write)
0, // (share) 0:cannot share the COM port
NULL, // security (None)
OPEN_EXISTING, // creation : open_existing
FILE_FLAG_OVERLAPPED, // we want overlapped operation
NULL // no templates file for COM port...
);
if (m_hCommPort==INVALID_HANDLE_VALUE)
{
DWORD err = GetLastError();
if (err == ERROR_FILE_NOT_FOUND) {
MessageBox(hWnd,"ERROR_FILE_NOT_FOUND",NULL,MB_ABORTRETRYIGNORE);
}
else
if(err == ERROR_INVALID_NAME) {
MessageBox(hWnd,"ERROR_INVALID_NAME",NULL,MB_ABORTRETRYIGNORE);
}
else
{
MessageBox(hWnd,"unkown error",NULL,MB_ABORTRETRYIGNORE);
}
}
else{
WriteAndReadPort(m_hCommPort,data);
}
}
pPortInfo++;
}
}
}
}
The Solution is to use
The Problem is, if your port is Bigger then 9 then you have to use the Syntax
LPCWSTR szPortName = L"\\\\.\\COM11";.
If you are on Windows 10 - running all system updates might help !
I had the same issue that opening port "COM4" returned an error ERROR_FILE_NOT_FOUND. When running the program as "Administrator" it worked. Now after a updating to 1511 the program can open "COM4" even not running as "Administrator".
http://www.cplusplus.com/forum/windows/163855/
Use CreateFileA(...) instead of CreateFile(...)
ERROR_FILE_NOT_FOUND can be produced from CreateFile(L"\\\\.\\COM1", ...) and CreateFile(L"COM1:", ...) after using the Device Manager to change the assigned COM Port number. Disabling and re-enabling the device, or unplugging and reconnecting the USB adapter resolves the issue.
A useful test to confirm whether it is your program or the system is to send data to the port in command prompt. A successful test will show an empty line. A failed test will show an error message.
C:\drop>echo > \\.\COM1
The system cannot find the file specified.
C:\drop>echo > \\.\COM1
C:\drop>
I'm looking for a programmatic way to get the version number of a driver. I want the same number that device manager shows in the driver properties for a device.
Background: I have an application that talks to some custom hardware. The device driver for the custom hardware has known bugs before a certain version number. I want the application to check the driver version and warn the user if they need to update it. The application runs on Windows XP and 7 and is written in C++.
A previous hack I used was to read the .sys file directly from system32/drivers and search for "FileVersion" directly. This is bad for many reasons. In particular it seems to need admin privileges on Windows 7.
I know the class GUID and the hardware ID (ie "USB\VID_1234&PID_5678").
The application currently uses SetupDiGetClassDevs, SetupDiEnumDeviceInterfaces and then SetupDiGetDeviceInterfaceDetail to get the "DevicePath". It then calls CreateFile with that path to talk to the driver.
It looks like I need to get a SP_DRVINFO_DATA structure from somewhere. I've tried various functions from setupapi.h, such as SetupDiGetDeviceInterfaceDetail. Here's some code I've tried that fails:
int main(void)
{
HDEVINFO DeviceInfoSet = SetupDiGetClassDevs((LPGUID)&GUID_DEVINTERFACE_USBSPI, NULL, NULL,
DIGCF_PRESENT | DIGCF_DEVICEINTERFACE);
SP_INTERFACE_DEVICE_DATA InterfaceDeviceData;
InterfaceDeviceData.cbSize = sizeof(SP_INTERFACE_DEVICE_DATA);
// Cycle through all devices.
for (int i = 0; i < 32; i++)
{
if (!SetupDiEnumDeviceInterfaces(DeviceInfoSet, 0, (LPGUID)&GUID_DEVINTERFACE_USBSPI, i, &InterfaceDeviceData))
break;
PSP_DEVICE_INTERFACE_DETAIL_DATA DeviceInterfaceDetailData;
DWORD RequiredSize;
SetupDiGetDeviceInterfaceDetail(DeviceInfoSet, &InterfaceDeviceData, NULL, 0, &RequiredSize, NULL);
DeviceInterfaceDetailData = (PSP_DEVICE_INTERFACE_DETAIL_DATA)HeapAlloc(GetProcessHeap(), HEAP_GENERATE_EXCEPTIONS | HEAP_ZERO_MEMORY, RequiredSize);
try
{
DeviceInterfaceDetailData->cbSize = sizeof(SP_DEVICE_INTERFACE_DETAIL_DATA);
SetupDiGetDeviceInterfaceDetail(DeviceInfoSet, &InterfaceDeviceData, DeviceInterfaceDetailData, RequiredSize, NULL, NULL);
// Try to get the driver info. This part always fails with code
// 259 (ERROR_NO_MORE_ITEMS).
SP_DRVINFO_DATA drvInfo;
drvInfo.cbSize = sizeof(SP_DRVINFO_DATA);
if (!SetupDiEnumDriverInfo(DeviceInfoSet, NULL, SPDIT_CLASSDRIVER, i, &drvInfo))
printf("error = %d\n", GetLastError());
printf("Driver version is %08x %08x\n", drvInfo.DriverVersion >> 32, drvInfo.DriverVersion & 0xffffffff);
}
catch(...)
{
HeapFree(GetProcessHeap(), 0, DeviceInterfaceDetailData);
throw;
}
HeapFree(GetProcessHeap(), 0, DeviceInterfaceDetailData);
}
SetupDiDestroyDeviceInfoList(DeviceInfoSet);
return 0;
}
Edit - My updated code now looks like this:
HDEVINFO devInfoSet = SetupDiGetClassDevs(&GUID_DEVINTERFACE_USBSPI, NULL, NULL,
DIGCF_PRESENT | DIGCF_DEVICEINTERFACE);
// Cycle through all devices.
for (int i = 0; ; i++)
{
// Get the device info for this device
SP_DEVINFO_DATA devInfo;
devInfo.cbSize = sizeof(SP_DEVINFO_DATA);
if (!SetupDiEnumDeviceInfo(devInfoSet, i, &devInfo))
break;
// Get the first info item for this driver
SP_DRVINFO_DATA drvInfo;
drvInfo.cbSize = sizeof(SP_DRVINFO_DATA);
if (!SetupDiEnumDriverInfo(devInfoSet, &devInfo, SPDIT_COMPATDRIVER, 0, &drvInfo))
printf("err - %d\n", GetLastError()); // Still fails with "no more items"
}
SetupDiDestroyDeviceInfoList(devInfoSet);
You're incorrectly reusing i as index in SetupDiEnumDriverInfo. That should be an inner loop for each driver info element per driver. As a result, you fail to retrieve driver info #0 for device #1.
Still, that doesn't explain why info #0 for device #0 fails. For that, you have to look at the second parameter of SetupDiEnumDriverInfo. That is a SP_DEVINFO_DATA structure for your device, but you leave it set to NULL. That gets you the list of drivers associated with the device class, not the device. I.e. that works for mice and USB sticks, which have class drivers. Your device probably has a vendor-specific driver, so you need the driver for that specific device.
As you asked a nearly identical question I post only the link to my answer here:
Why does SetupDiEnumDriverInfo give two version numbers for my driver
I'm trying to use CreateFileMapping and OpenFileMapping to share memory between processes. This isn't working as I want it to - OpenFileMapping returns null and GetLastError is 5 - access denied. Any ideas what I am doing wrong? Name is something like MemoryTest.
Edit:
using CreateFileMapping both times I can read the data written in the other process. The reason this is a problem is that I get Error 183 - memory area already exists. However, it still returns a handle to the existing memory.
var map_handle = CreateFileMapping(INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE, 0, sizeof(int), name.c_str());
....
var handle = MapViewOfFile(map_handle, FILE_MAP_ALL_ACCESS , 0, 0, 0)
*handle = 10;
UnMapViewOfFile(map_handle);
getchar();
Other process:
var map_handle = OpenFileMapping(PAGE_READWRITE, false, name.c_str())
....
var handle = MapViewOfFile(map_handle, FILE_MAP_ALL_ACCESS , 0, 0, 0) //returns null
var out = *handle;
getchar();
This works for the second process though:
var map_handle = CreateFileMapping(INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE, 0, sizeof(int), name.c_str());
....
var handle = MapViewOfFile(map_handle, FILE_MAP_ALL_ACCESS , 0, 0, 0) //returns null
var out = *handle;
getchar();
Simple things to be aware of from the very start:
Error code 5: ERROR_ACCESS_DENIED "Access is denied."
Error code 183: ERROR_ALREADY_EXISTS "Cannot create a file when that file already exists."
ERROR_ALREADY_EXISTS is a documented behavior and is an indication of scenario that you do receive handle, but it is a handle to already existing object, not created.
The problem with not working OpenFileMapping is around its first argument: the API function expects values/flags from another enumeration, it takes FILE_MAP_* values and not PAGE_*. Incorrect argument results in failure to open you the mapping you want.
In case someone else needed, in my case the error has nothing to do with the access to the file, it's with the size provided to the CreateFileMapping, after spending hours with a similar error I'd to use a working sample posted somewhere else and line by line compare what was the difference.
If you don't know the size of the file when executing the CreateFileMapping you need to use 0, this will tell the API to use the file size of the mapped file. Most of the answers in SO around this are wrong and people is not bothering testing what is the problem about, I wasted hours reading other posts with similar suggestions.
To solve the problem the code should look like this:
var map_handle = CreateFileMapping(INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE, 0, 0, name.c_str());
Hope this saves hours to other fellow developers.
I just asked a question earlier today because I wanted to run an executable file that takes parameters from my C++ code and it wasn't working.
It works now, but I'm still having problems since I thought I was going the right way about this, but it seems like what I want to accomplish can't be done the way I'm approaching it...
This is my corrected code from my other question:
#include <stdlib.h>
#include <conio.h>
int main (){
system("\"\"C:\\Users\\Adam\\Desktop\\pdftotext\" -layout \"C:\\Users\\Adam\\Desktop\\week 4.pdf\"\"");
_getch();
}
which is me running "pdftotext -layout myfile.pdf" as if I was running it from a CMD window.
The thing is, I don't actually want the cmd to show up since I have a GUI interface on top of it and I want to display a nicer progress bar instead of seeing the windows pop-up for every file I need to parse.
I looked around and either I don't understand what I'm reading since I'm relatively new to C++, or I just didn't find what I was looking for. I found that using CreateProcess, I should be able to do this, but after copying some code I found somewhere else, the cmd window pops-up anyway.
I'd like it if someone could give me the name of a function I could use to accomplish something like this or if someone could give some example code for this small case in the code I posted since I'm not sure I understand everything as I should, being new to C++ and all.
Edit: As requested in a comment, the code for CreateProcess that I tried is what I found at this url:
http://www.goffconcepts.com/techarticles/development/cpp/createprocess.html
Which is (with my own parameters that I think should go there):
#include <windows.h>
#include <string>
#include <conio.h>
size_t ExecuteProcess(std::wstring FullPathToExe, std::wstring Parameters, size_t SecondsToWait)
{
size_t iMyCounter = 0, iReturnVal = 0, iPos = 0;
DWORD dwExitCode = 0;
std::wstring sTempStr = L"";
/* - NOTE - You should check here to see if the exe even exists */
/* Add a space to the beginning of the Parameters */
if (Parameters.size() != 0)
{
if (Parameters[0] != L' ')
{
Parameters.insert(0,L" ");
}
}
/* The first parameter needs to be the exe itself */
sTempStr = FullPathToExe;
iPos = sTempStr.find_last_of(L"\\");
sTempStr.erase(0, iPos +1);
Parameters = sTempStr.append(Parameters);
/* CreateProcessW can modify Parameters thus we allocate needed memory */
wchar_t * pwszParam = new wchar_t[Parameters.size() + 1];
if (pwszParam == 0)
{
return 1;
}
const wchar_t* pchrTemp = Parameters.c_str();
wcscpy_s(pwszParam, Parameters.size() + 1, pchrTemp);
/* CreateProcess API initialization */
STARTUPINFOW siStartupInfo;
PROCESS_INFORMATION piProcessInfo;
memset(&siStartupInfo, 0, sizeof(siStartupInfo));
memset(&piProcessInfo, 0, sizeof(piProcessInfo));
siStartupInfo.cb = sizeof(siStartupInfo);
if (CreateProcessW(const_cast<LPCWSTR>(FullPathToExe.c_str()),
pwszParam, 0, 0, false,
CREATE_DEFAULT_ERROR_MODE, 0, 0,
&siStartupInfo, &piProcessInfo) != false)
{
/* Watch the process. */
dwExitCode = WaitForSingleObject(piProcessInfo.hProcess, (SecondsToWait * 1000));
}
else
{
/* CreateProcess failed */
iReturnVal = GetLastError();
}
/* Free memory */
delete[]pwszParam;
pwszParam = 0;
/* Release handles */
CloseHandle(piProcessInfo.hProcess);
CloseHandle(piProcessInfo.hThread);
return iReturnVal;
}
int main(void){
ExecuteProcess(L"C:\\Users\\Adam\\Desktop\\pdftotext", L"-layout \"C:\\Users\\Adam\\Desktop\\week 4.pdf\"", 0);
_getch();
}
I'm a little bit overwhelmed since it uses some things I've never used before, but I think I understand the core (keyword: think). It doesn't solve my problem, though, because the cmd shows up and by retesting it I actually noticed that the cmd doesn't even run the .exe and doesn't give me an error message.
I hope this bit of code helps... I didn't want to look into it further since it seemed like I wasn't even going in the right direction.
Use CreateProcess instead of system.
--EDIT--
the code for CreateProcess that I tried is what I found at this url:
The code is a mess, I'd advise to avoid that url in future.
At the end of "CreateProcess" article is a link named "Creating Processes", which contains simpler example that is easier to read. Use it as a starting point.
After adding the following lines for siStartupInfo, cmd window won't pop up any more with my own test *.exe.
siStartupInfo.dwFlags = STARTF_USESTDHANDLES | STARTF_USESHOWWINDOW;
siStartupInfo.hStdInput = GetStdHandle(STD_INPUT_HANDLE);
siStartupInfo.hStdOutput = GetStdHandle(STD_OUTPUT_HANDLE);
siStartupInfo.hStdError = GetStdHandle(STD_ERROR_HANDLE);
siStartupInfo.wShowWindow = SW_HIDE;
But I have another problem. As I try to run some other executable, whose command line would be
TEST.exe <input-file> output-file
in a cmd window, WaitForSingleObject() return 258, and GetLastError() return 1813 ("The specified resource type cannot be found in the image file.").
See system() and CreateProcess() / CreateProcessW() for more details.
Any ideas would be highly appreciated!
The only way I found how to execute an external program is:
system("start C:\file path\ file");
The only problem is that the file or directory can't have spaces.