用VS2008編寫了一個DLL工程，打算加上application進行調試，結果點下F5，DLL工程中的所有斷點都被禁掉了，顯示如下：
The breakpoint will not currently be hit. No symbols have been loaded for this document.
在網上搜了一下有沒有找到合適的結果，自己瞎折騰倒是折騰出來了，再搜，找到了合適的結果，總結如下：
原因
DLL工程中的 pdb 文件的時間戳與application路徑下的dll文件的時間戳 不一致。即當DLL工程新編譯後，沒有將工程下的新編譯的dll文件拷貝至 application路徑下，使得 application路徑下的dll文件仍然爲舊的。
解決辦法
1. 將application exe拷貝至DLL功能debug目錄下，這樣就不會發生上述情況。
或
2. 在每次新編譯dll後及時更新 application路徑下的dll文件。
順帶附上在網上找到的一個英文解決辦法，沒看太懂，是C#，不過道理估計是相通的。
two projects, the first one (A) calls the second (B) as a .dll .Both are projects for PocketPC (Smart device applications).
When i set a Breakpoint in the code of B it looks OK but when i Debug Question Mark appears with the infamous
note: The Breakpoint will not currently be hit. No Symbols have been loaded for this document.
The B.pdb has a timestamp different from B.dll and THIS is the problem. You have to DELETE B.pdb NOT ONLY from the Debug/bin directory because THERE IS ANOTHER COPY of this B.pdb in the obj directory and you CAN'T touch this copy so easily. So here is the complete walkthrough:
1) For your project set "Generate DEBUG information" to FALSE
2) DELETE ALL the occurences of B.pdb under /bin and /obj
3) Set "Generate DEBUG information" back to TRUE
4) BUILD
Between 2 and 3 I also built once but i think this is not necessary.
Now my pdb and dll have the same timestamp and all is working perfectly