C++ struct marshaling in C#

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Hi All,

Please give me the C# equivalent of below code. GetAvailableDevices() method is using the out param pointer to struct.

C++

typedef unsigned long deviceid;
struct DeviceList 
{
	DWORD count;
	DWORD padding;
	struct DeviceInfo *DeviceInfo;
};
struct DeviceInfo 
{
	deviceid DevID;
	DWORD Status;
	const char * Description;
	const char * LongDescription;
};
ERRORID WINAPI GetAvailableDevices(struct DeviceList **DeviceList);

Posted 13-May-10 11:35am

Member 2975111

Updated 14-May-10 6:09am

Moak

v4

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Henry Minute · Answer 1 · 2010-05-13T13:27:00

Solution 1

I am not familiar with GetAvailableDevices() but a quick Google found this[^] on stackoverflow.

Any help?

Posted 13-May-10 13:27pm

Henry Minute

Updated 13-May-10 14:54pm

v2

DaveyM69 · Answer 2 · 2010-05-14T00:03:00

You can use the PtrToStructure method in the Marshal class. Alternatively you can use the Copy method to construct the struct instances from a byte[].

It looks like you'll have to do some pointer aritmetic to increment the pointer DeviceList.count -1 number of times to get each device's info.

Without knowing what API this is part of so we have all the reference material it is hard to help any further.