Win32 SDK 学习笔记5

要在指定位置显示文字，用的更多是TextOut()函数。它与DrawText()函数特点不同，作用也不同。

一、TextOut()函数的基本用法

TextOut()函数既不处理回车符、TAB键等，也不自动回行，以指定的位置作基准点，在其附近显示，默认时基准点是这一行字的左上角。要知道当前文字的对齐方式，可以用GetTextAlign()函数，本节先学习与之相对的SetTextAlign()函数。

TextOut(hdc, 30, 20, str1, (int)strlen(str1) );

二、文字的对齐方式

SetTextAlign()函数用来设置文字的对齐方式。下面我们以窗口正中间作为基准点来了解这个函数基本内容。

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) {

HDC hdc;
PAINTSTRUCT ps;
TCHAR str1[] = "My first GDI is so easy and cool!";
RECT rc;//
int x;//

switch(message) {
case WM_PAINT:
hdc = BeginPaint(hWnd, &ps);
GetClientRect(hWnd, &rc);//
x = rc.right / 2;//

SetTextAlign(hdc, TA_LEFT);//左对齐
TextOut(hdc, x, 20, str1, (int)strlen(str1) );//
EndPaint(hWnd, &ps);
break;
//其中"//"表示左对齐新加的代码

三、设置文字的字体、大小、方向

#include <windows.h>

TCHAR szWindowClass[] = "My first window's name";
TCHAR szTitle[] = "My first window";

ATOM MyRegisterClass(HINSTANCE);
BOOL InitInstance(HINSTANCE, int);
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
HFONT SetMyFont(HDC, LPCTSTR, int, int, int);

int CALLBACK WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd ) {
MSG msg;

MyRegisterClass(hInstance);

if ( !InitInstance(hInstance, nShowCmd) ) {
return FALSE;
}

while ( GetMessage(&msg, NULL, 0, 0) ) {
TranslateMessage(&msg);
DispatchMessage(&msg);
}

return (int)msg.wParam;
}

ATOM MyRegisterClass(HINSTANCE hInstance) {
WNDCLASSEX wc;

wc.cbSize = sizeof(WNDCLASSEX);
wc.style = CS_VREDRAW | CS_HREDRAW;
wc.lpfnWndProc = (WNDPROC)WndProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = hInstance;
wc.hIcon = LoadIcon(hInstance, IDI_APPLICATION);
wc.hCursor = LoadCursor(hInstance, IDC_SIZEALL);
wc.hbrBackground = (HBRUSH)GetStockObject(GRAY_BRUSH);
wc.lpszMenuName = NULL;
wc.lpszClassName = szWindowClass;
wc.hIconSm = LoadIcon(wc.hInstance, IDI_APPLICATION);

return RegisterClassEx(&wc);
}

BOOL InitInstance(HINSTANCE hInstance, int ncmdshow) {
HWND hWnd;

hWnd = CreateWindow(szWindowClass,
szTitle,
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT,
CW_USEDEFAULT,
200,
200,
NULL,
NULL,
hInstance,
NULL);
if (!hWnd) {
return FALSE;
}
ShowWindow(hWnd, ncmdshow);
UpdateWindow(hWnd);

return TRUE;
}

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) {

HDC hdc;
PAINTSTRUCT ps;

HFONT hFont, hFontOld;
TCHAR str1[] = "My first GDI";
TCHAR str2[] = "星期三";
TCHAR str3[] = "Configuration";
int width, height;

switch(message) {
case WM_PAINT:
RECT rc;
hdc = BeginPaint(hWnd, &ps);
GetClientRect(hWnd, &rc);
SetBkMode(hdc, TRANSPARENT);

width = (rc.right - 20) / (int)strlen(str1);
height = rc.bottom - 20;

hFont = SetMyFont(hdc, (LPCTSTR)"黑体", width, height, 90);
hFontOld = (HFONT)SelectObject(hdc, hFont);
SetTextColor(hdc, 0xC0C0C0);
TextOut(hdc, 10, 10, str1, (int)strlen(str1));
DeleteObject(hFont);

hFont = SetMyFont(hdc, (LPCTSTR)"楷体", width, height, 450);
hFontOld = (HFONT)SelectObject(hdc, hFont);
SetTextColor(hdc, 0xF00000);
TextOut(hdc, 16, 0, str2, (int)strlen(str2));
DeleteObject(hFont);

hFont = SetMyFont(hdc, (LPCTSTR)"宋体", width, height, -90);
hFontOld = (HFONT)SelectObject(hdc, hFont);
SetTextColor(hdc, 0x0F0000);
TextOut(hdc, 0, 10, str3, (int)strlen(str3));
DeleteObject(hFont);

break;
case WM_DESTROY:
PostQuitMessage(0);
break;

default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
return 0;
}

HFONT SetMyFont(HDC hdc, LPCTSTR face, int width, int height, int angle)
{
HFONT hFont;
hFont = CreateFont(
height,      //字体的逻辑高度
width,       //逻辑平均字符宽度
angle,       //与水平线的角度
0,           //基线方位角度
FW_REGULAR,  //字形：常规
FALSE,       //字形：斜体
FALSE,       //字形：下划线
FALSE,       //字形：粗体
GB2312_CHARSET,          //字符集
OUT_DEFAULT_PRECIS,      //输出精度
CLIP_DEFAULT_PRECIS,     //剪截精度
PROOF_QUALITY,           //输出品质
FIXED_PITCH | FF_MODERN, //倾斜度
face                     //字体
);
return hFont;
}