希望大家能说说C语言能与系统之间联系的编程技巧来!

我只知道用system()命令调用一些DOS命令处理一些系统的东西像:del,dir,copy等,此外就不怎么使C语言与系统联系起来了,要是C语言只能处理一些回文呀,字符串的话,那也太无聊了吧,希望有高手来发表一下高论,让我等见识一下C语言的威力

知道API吗？
这个程序是创建一个窗体，并在窗体里面画一条直线的。

#include <windows.h>

LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,

PSTR szCmdLine, int iCmdShow)

{
static TCHAR szAppName[] = TEXT ("Herbert") ;

HWND hwnd ;

MSG msg ;

WNDCLASS wndclass ;

wndclass.cbClsExtra = 0;
wndclass.cbWndExtra = 0;
wndclass.hbrBackground = (HBRUSH) GetStockObject(WHITE_BRUSH);
wndclass.hCursor = LoadCursor(NULL, IDC_CROSS);
wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
wndclass.hInstance = hInstance;
wndclass.lpfnWndProc = WndProc;
wndclass.lpszClassName = szAppName;
wndclass.lpszMenuName = NULL;
wndclass.style = CS_HREDRAW | CS_VREDRAW;

if (!RegisterClass(&wndclass))
{

MessageBox ( NULL, TEXT ("This program requires Windows NT!"),

szAppName, MB_ICONERROR) ;

return 0 ;

}

hwnd = CreateWindow( szAppName, // window class name

TEXT ("The Hello Program"), // window caption

WS_OVERLAPPEDWINDOW, // window style

CW_USEDEFAULT,// initial x position

CW_USEDEFAULT,// initial y position

CW_USEDEFAULT,// initial x size

CW_USEDEFAULT,// initial y size

NULL, // parent window handle

NULL, // window menu handle

hInstance, // program instance handle

NULL) ; // creation parameters

ShowWindow (hwnd, iCmdShow) ;

UpdateWindow (hwnd) ;

while (GetMessage (&msg, NULL, 0, 0))
{

TranslateMessage (&msg) ;
DispatchMessage (&msg) ;
}

return msg.wParam ;

}

LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
HDC hdc ;
PAINTSTRUCT ps ;

switch (message)
{
case WM_PAINT:
hdc = BeginPaint (hwnd, &ps) ;

MoveToEx(hdc, 10, 10, NULL);
LineTo(hdc, 200, 200);

EndPaint (hwnd, &ps) ;
return 0 ;

case WM_DESTROY:
PostQuitMessage (0) ;
return 0 ;
}

return DefWindowProc (hwnd, message, wParam, lParam) ;

}

API知道一点点,你所写的应该是用VC++写的吧,我现在对C++不了解啊

我也没有深入地学c＋＋，学了一些皮毛，
然后又学其它的去了，还是先多了解一些东西吧！