masm造weak symbol

masm或ml.exe可以用alias造weak external symbol,这样可以起到链接时有就选用户提供的，无就选系统默认的这样一个功能。这个语法很简单，但不好找。以前找了又忘了，特记下：

alias <sym2> = <sym1>

这次是在这里搜到的：

http://rs1.szif.hu/~tomcat/win32/win32asm.txt

php和mysql支持utf8

老生常谈了，网上很多文，我再多写一篇！

1. my.cnf里加上：
[client]
default-character-set=utf8

[mysqld]
default-character-set=utf8

重启mysqld，连上去看看：

mysql> SHOW VARIABLES LIKE '%character%';SHOW VARIABLES LIKE 'collation%';
+--------------------------+----------------------------+
| Variable_name            | Value                      |
+--------------------------+----------------------------+
| character_set_client     | utf8                       |
| character_set_connection | utf8                       |
| character_set_database   | utf8                       |
| character_set_filesystem | binary                     |
| character_set_results    | utf8                       |
| character_set_server     | utf8                       |
| character_set_system     | utf8                       |
| character_sets_dir       | /usr/share/mysql/charsets/ |
+--------------------------+----------------------------+
8 rows in set (0.00 sec)

+----------------------+-----------------+
| Variable_name        | Value           |
+----------------------+-----------------+
| collation_connection | utf8_general_ci |
| collation_database   | utf8_general_ci |
| collation_server     | utf8_general_ci |
+----------------------+-----------------+
3 rows in set (0.00 sec)

2. php里也要改，写个函数：

<?php
function connect_db($dbname)
{
 global $mysql_addr, $mysql_user, $mysql_pass;
 $dbcon = mysql_connect($mysql_addr, $mysql_user, $mysql_pass);
 mysql_query("SET NAMES 'utf8'; SET CHARACTER_SET_CLIENT=utf8; "
."SET CHARACTER_SET_RESULTS=utf8; ", $dbcon);
 if ($dbname)
 {
  mysql_select_db($dbname, $dbcon);
 }
 return $dbcon;
}
?>

3. 数据库可以改一下:

alter database mydb CHARACTER SET  ‘utf8′ ;      

alter table tablename CHARACTER SET ‘utf8′;

不过这两句不会改内容,如果内容原来不是utf8的字节,就要导出导入了.

修改了一个setacl的BUG

setacl在处理注册表时有问题，写得不对。修改如下：

csetacl.cpp:

--- CSetACL.cpp.old     2009-04-06 23:44:41.000000000 +0800
+++ CSetACL.cpp 2009-04-06 23:57:16.000000000 +0800
@@ -2288,7 +2288,7 @@
        m_nAPIError                     =       RegOpenKeyEx (hRemoteKey ? hRemoteKey : hMainKey,  sSubkeyPath, 0, KEY_ENUMERATE_SUB_KEYS | KEY_EXECUTE, &hOpenStd);
 
        // We now know the key exists. Let's try some black magic and open it like a backup program
-       if (hOpenStd && (m_nAPIError == ERROR_SUCCESS || m_nAPIError == ERROR_ACCESS_DENIED))
+       if (hOpenStd || m_nAPIError == ERROR_ACCESS_DENIED)
        {
                DWORD   nNewCreated     =       0;
                DWORD nErrTmp   =       0;
@@ -2307,6 +2307,7 @@
                if (hOpenBckp && nErrTmp == ERROR_SUCCESS)
                {
                        *hSubKey                =       hOpenBckp;
+                       m_nAPIError = ERROR_SUCCESS;
 
                        // The standard key is not needed
                        RegCloseKey (hOpenStd);

新exe在这里.

设置注册表权限方法：

setacl -ot reg -on HKEY_LOCAL_MACHINE\aaaa\hehe  -rec yes  -actn setowner  -ownr n:Administrators -actn clear -clr dacl -actn setprot -op dacl:np

使hdtune扫硬盘时可以从某个位置开始

hdtune扫硬盘坏道，很慢。为了让它可以从某个位置开始，调了一下：

004089F5                            . 57                      PUSH EDI                                 ; /lParam
004089F6 <blockpos>                 . 8B7C24 1C               MOV EDI,DWORD PTR SS:[ESP+1C]            ; |
004089FA                            . 8946 1A                 MOV DWORD PTR DS:[ESI+1A],EAX            ; |
004089FD                            . 57                      PUSH EDI                                 ; |wParam
004089FE                            . 68 0E040000             PUSH 40E                                 ; |Message = WM_USER+14.
00408A03                            . 51                      PUSH ECX                                 ; |hWnd
00408A04                            . FF15 FC964700           CALL DWORD PTR DS:[4796FC]               ; \SendMessageA

 在 blockpos处，修改esp+1c里的值，就可以了。

总的来说，hdtune把硬盘分为很多个格子，每行５０个，总共有很多行。每一个小格扫完后，就发送这个自定义的消息 WM_USER+14来通知主线程画一个色块。绿色表示无问题，红色表示有问题。运行到blockpos这一行时，把这个值改掉，即可定义到第n个格子。第０个为左上，第４９个为第一行最后一个，依此类推。