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ReadProcessMemory only returning one byte

Posted on 2011-03-16
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Last Modified: 2012-05-11
Hi, I have the following C# code. It's meant to return an Integer, but it only returns 256 at the most.
It appears that I'm missing the next byte.
Does anybody have any ideas?

Thanks
byte[] buffer = new byte[200];
fixed (byte* cptr = &buffer[0])
{
int x = 0;
int* xptr = &x;
IntPtr hProcess = OpenProcess(PROCESS_VM_READ, false, p[0].Id);
bool result = ReadProcessMemory(hProcess, baseAddress, cptr, 8, null);

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Question by:Netlink2
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Accepted Solution

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MedievalWarrior earned 500 total points
ID: 35147319
You don't need to allocate the buffer just pass the pointer to the Integer variable ( This may require some modification to P/Invoke siganture) and it will copy it but make sure you have the correct baseAddress and your using the correct Length of the data type...

** It's meant to return an Integer **

Which type of Integer ? Your code indicates you want a LONG integer because your requesting 8 bytes. If you want Integer then request 4 bytes. You can use the Integer variable as the buffer instead of a byte array and request to read 4 bytes or use a Long variable and request 8 bytes. If you use byte buffer then you could use BitConverter.ToInt32() but make sure you specify the correct offsets. You might also want to allow the last parameter of ReadProcessMemory() to fill in the amount of bytes read so that you can make sure that what you request is the same as what has been returned.


bool result = ReadProcessMemory(hProcess, baseAddress, xptr, 4, cbRead); 

// If cbRead = 4 then you know the call returned you the correct amount of bytes requested

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