Thread: Problem Reading Process Memory

I am having a strange problem. For a fun little test, I decided to see if I could get some minesweeper info out of memory. For some reason though, ReadProcessMemory() fails every time. I am not sure why because with this same code I was previously reading some memory from other processes. I have tried opening the process with PROCESS_ALL_ACCESS but to no avail. Can anyone point me in the right direction?

Also, point out any bad code practices.

Code:

#include <stdio.h>
#include <windows.h>

typedef unsigned long  DWORD;

int main(void)
{
	HWND hWnd = FindWindow(NULL, "Minesweeper");
	HWND pHandle;
	DWORD PID;

	unsigned long lpWidth = 0x1005334;
	unsigned long bytesread;
	unsigned int width;
	
	if (hWnd == NULL)
	{
		printf("Window not found\n");
		return 1;
	}

	printf("Window Handle = %x\n", hWnd);

	GetWindowThreadProcessId(hWnd, &PID);

	printf("Process ID = %x\n", PID);

	pHandle = OpenProcess(PROCESS_ALL_ACCESS, 1, PID);

	printf("Process Handle = %x\n", pHandle);

	if (pHandle == NULL)
	{
		printf("The Process handle could not be retrieved\n");
		return 1;
	}

	if (ReadProcessMemory(pHandle, &lpWidth, &width, sizeof(width), &bytesread))
	{
		printf("Width = %d\n", width);
	}
	else
	{
		printf("ReadProcessMemory Failed\n");
	}


	return 0;
}