Making GetRawInputDeviceInfo and RIDI_DEVICEINFO work with C#

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I have the problem that I can't seem to make GetRawInputDeviceInfo work in combination with RIDI_DEVICEINFO (to try to retrieve a RID_DEVICE_INFO) is not working at all.

I get the error -1 back from the function, what should mean that there is not enough space to store the RID_DEVICE_INFO, buy I tried already to increase it to the more then needed but the effect the same.

I used the following DLLImports :

C#

[DllImport("User32.dll")]
extern static uint GetRawInputDeviceInfo(IntPtr hDevice, uint uiCommand, IntPtr pData, ref uint pcbSize);

[DllImport("User32.dll")]
unsafe extern static uint GetRawInputDeviceInfo(IntPtr hDevice, uint uiCommand, IntPtr pData, IntPtr pcbSize);

Both with no result, but when I try these with RIDI_DEVICENAME they both work just fine. In this case I call the function like this :

first to get the size:

C#

GetRawInputDeviceInfo(rid.hDevice, RIDI_DEVICENAME, IntPtr.Zero, pSize);

and then :

C#

GetRawInputDeviceInfo(rid.hDevice, RIDI_DEVICENAME, pData, pSize);

to get the name. Both work fine, but when I call the function like this :

C#

int intReturn = (int)GetRawInputDeviceInfo(rid.hDevice, RIDI_DEVICEINFO, IntPtr.Zero, pInfoSize);
intReturn = (int)GetRawInputDeviceInfo(rid.hDevice, RIDI_DEVICEINFO, pInfoData, pInfoSize);

Then at first I get 0 into intReturn and also can get the correct size, but then I get -1 into return, and whan I do a PtrToStructure it just returns wrong and seemingly random values.

Also when I after that do a GetLastWin32Error(), it return sometime 1008 or 87 , what also seems not to make any logic to me, because I don't see where I could have made the wrong parameters.

I defined RIDI_DEVICENAME and RIDI_DEVICEINFO as :

C#

internal const uint RIDI_DEVICENAME = 0x20000007;
internal const uint RIDI_DEVICEINFO = 0x2000000b;

Can anyone help with this problem or show me a working C# example for GetRawInputDeviceInfo ?

Thanks, Peter

Posted 3-Sep-12 23:30pm

jedike

Updated 3-Sep-12 23:31pm

v2

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Richard Chambers · Answer 1 · 2015-07-24T01:55:00

Here is the way that I am using the RIDI_DEVICEINFO parameter with the GetRawInputDeviceInfo() function. What I found was that the cbSize member of the RIDI_DEVICEINFO struct needed to be initialized with the size of the struct.

Just now looking at the Microsoft MSDN on-line documentation it mentions the following:

Quote:
If uiCommand is RIDI_DEVICEINFO, set the cbSize member of RID_DEVICE_INFO to sizeof(RID_DEVICE_INFO) before calling GetRawInputDeviceInfo.

C++

UINT             cbDataSize = 1000;
RID_DEVICE_INFO  DevInfo = {0};

DevInfo.cbSize = cbDataSize = sizeof(DevInfo);  // specify the buffer size
GetRawInputDeviceInfo(pRawInputDeviceList[i].hDevice, RIDI_DEVICEINFO, &DevInfo, &cbDataSize);