Hello VC++

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Swap Mouse Button

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#include <tchar.h>
#include "windows.h"


using namespace std;

int main() {

  // a handler
	HKEY key;
  // target key
	LPCTSTR SubKey = _T("Control Panel\\Mouse");
	if (::RegOpenKeyEx(HKEY_CURRENT_USER, SubKey, 0, KEY_ALL_ACCESS, &key) !=
		ERROR_SUCCESS) {
		::RegCloseKey(key);
	}

	char dwValue[256];
	DWORD dwSize = sizeof(DWORD);
	DWORD dwType = REG_SZ;
	if (::RegQueryValueEx(key, _T("SwapMouseButtons"), 0, &dwType,
		(LPBYTE)&dwValue, &dwSize) != ERROR_SUCCESS) {
		::RegCloseKey(key);
	}


	if (dwValue[0] == '1') {

		DWORD value = '0';
		if (ERROR_SUCCESS
			!= ::RegSetValueEx(key, _T("SwapMouseButtons"), 0, REG_SZ,
			(CONST BYTE*) &value, 1)) {
			::RegCloseKey(key);
		}

		SwapMouseButton(0);
	} else {
		DWORD value = '1';
		if (ERROR_SUCCESS
			!= ::RegSetValueEx(key, _T("SwapMouseButtons"), 0, REG_SZ,
			(CONST BYTE*) &value, 1)) {
			::RegCloseKey(key);
		}

		SwapMouseButton(1);
	}
  // release
	::RegCloseKey(key);

}
  • RegOpenKeyEx/ RegQueryValueEx/ RegSetValueEx is register table function.
  • RegCloseKey when function above failed release handler.
  • SwapMouseButton used to control which button’s left right.

LPCTSTR

  • L Long no actual meaning
  • P pointer
  • C constant
  • T base on UNICODE macro, define char or wchar_t
  • STR string char*

So LPCTSTR almost const char*

If macro not define UNICODE, lead to

const char* value can’t initial LPCTSTR instance class.

Solution

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#include <tchar.h>
LPCTSTR SubKey = _T("Control Panel\\Mouse");

or

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LPCWSTR SubKey = L"Control Panel\\Mouse";

_T("ABC") the letter in _T() obtain 2 bytes same as chinese characters.