Perhaps you are using the incorrect version of the winscard.lib. There exist several versions under this name. Try to change the librarty search directory order to ensure you are use the correct one. Hope helps.

DWORD d;
CString cstrExample;
cstrExample.Format(_T("%d"), d);

S O C K E T !

Ah, really?

Simple way: They are just plain text files. Use general file operations. Complete way: Office Automation. You can find a sample in the MSDN.

For example you have two header file: h1.h h2.h Their contents are something like: content1 content2 respectly. You load it at the begining of your program to two vars. Then you can use any of them when you need. You can also load either of them when you need, it depends on the size of the header files and other things. Hope it helps.

DirectShow in the Windows SDK. XAudio/Dsound in the DirectXSDK or you can just use a plain WaveIn/Out API to record the sound for you. Yes, you need sockets.