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这是源代码

#include

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

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,

PSTR szCmdLine, int iCmdShow)

{

static TCHAR szAppName[] = TEXT("HelloWin");

HWND hwnd;

MSG msg;

WNDCLASS wndclass;

wndclass.style = CS_HREDRAW | CS_VREDRAW;

wndclass.lpfnWndProc = WndProc;

wndclass.cbClsExtra = 0;

wndclass.cbWndExtra = 0;

wndclass.hInstance = hInstance;

wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);

wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);

wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);

wndclass.lpszMenuName = NULL;

wndclass.lpszClassName = szAppName;

if (!RegisterClass(&wndclass)){

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

return 0;

}

hwnd = CreateWindow(szAppName,

TEXT("Get System Metrics No.1"),

WS_OVERLAPPEDWINDOW,

CW_USEDEFAULT,

CW_USEDEFAULT,

CW_USEDEFAULT,

CW_USEDEFAULT,

NULL,

NULL,

hInstance,

NULL);

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)

{

static int cxCher,cxCaps,cyCher;

HDC hdc;

int i;

PAINTSTRUCT ps;

TCHAR szBuffer[10];

TEXTMETRIC tm;

switch (message)

{

case WM_CREATE:

hdc = GetDC(hwnd);

GetTextMetrics(hdc, &tm);

cxCher = tm.tmAveCharWidth;

cxCaps =(tm.tmPitchAndFamily & 1 ? 3 : 2) * cxCher / 2;

cyCher = tm.tmHeight + tm.tmExternalLeading;

ReleaseDC(hwnd, hdc);

return 0;

case WM_PAINT:

hdc = BeginPaint(hwnd, &ps);

for (i = 0; i

{

TextOut(hdc, 0, cyCher*i,

sysmetrics[i].szLabel,

lstrlen(sysmetrics[i].szLabel));

TextOut(hdc, 22 * cxCaps, cyCher*i,

sysmetrics[i].szDesc,

lstrlen(sysmetrics[i].szDesc));

SetTextAlign(hdc, TA_RIGHT | TA_TOP);

TextOut(hdc, 22 * cxCaps + 40 * cxCher, cyCher*i,

szBuffer, wsprintf(szBuffer, TEXT("%5d"),

GetSystemMetrics(sysmetrics[i].iIndex)));

SetTextAlign(hdc, TA_LEFT | TA_TOP);

}

EndPaint(hwnd, &ps);

return 0;

case WM_DESTROY:

PostQuitMessage(0);

return 0;

}

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

}