為啥移動滾動條兩者移動速度不一致！
uj5u.com熱心網友回復：
這個沒法猜啊，用一句老話說就是“源代碼說明一切，測驗結果既真理”猜想就是有個變數沒同步。
uj5u.com熱心網友回復：
用的雙緩沖繪圖，就是移動時兩部分移動速度不一致
uj5u.com熱心網友回復：
Setting a Breakpoint on a Message Received by a Windows FunctionYou can set message breakpoints to stop the debugger when a particular WndProc function message is received.
Note Message breakpoints work only on x86- or Pentium-based systems.
To set a breakpoint on a message
From the Edit menu, click Breakpoints.
The Breakpoints dialog box appears.
Click the Messages tab.
In the Break At WndProc text box, type the name of the Windows function.
If you are setting a breakpoint during a debug session, the list contains the exported functions in your project.
In the Set One Breakpoint For Each Message To Watch list box, select the message.
To set another breakpoint, press ENTER, and then repeat steps 3 and 4.
The Breakpoints list displays the currently active breakpoints.
Click OK to set the breakpoints.
Note If you interrupt execution while Windows or other system code is running, the results can be unpredictable.
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