在Windows操作系统中,当用户按下"PrintScreen"按钮后,Windows自动将当前屏幕的图像拷贝到系统剪贴板中,这时可以通过"画笔"这个小程序将剪贴板中的内容保存成图像文件,可以看出,如果需要将当前屏幕保存下来还是比较麻烦的,能否可以自己编写一个应用程序,自动将当前屏幕的内容保存到一个图像文件中去呢?这个答案是肯定的,本实例应用程序就是利用通用的热键管理DLL库实现的热键功能,在收到热键通知后截取屏幕的内容并保存到bmp文件中。例如我们设置图片保存路径为c:\,热键为F9 + Control,然后按Change按钮设置好热键,那么当我们按下CTRL+F9后,当前界面将以BMP图像文件的格式被保存在C:\目录下。程序编译运行后的界面效果如图一所示:
U4%P0}q/
oA`Ncu5 一、实现方法
Dzb@H$BQ7 S);bcowf_ 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
(Ys0|I3 ^,,|ED\M{m #pragma data_seg("shareddata")
&6h,' U HHOOK hHook =NULL; //钩子句柄
eP6>a7gc UINT nHookCount =0; //挂接的程序数目
y/E%W/3 static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
q^EG'\<^ static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
/1Ndir^c static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
y "gYv static int KeyCount =0;
GDhg
VOW( static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
'(=krM9; #pragma data_seg()
tMC<\e 5s8k^n"A 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
fAXF_wj g+U6E6}1 DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
UkeX"> A+>+XA' BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
pLNv\M+ cKey,UCHAR cMask)
FK>8(M/ {
TtlZum\ BOOL bAdded=FALSE;
7h0LR7 for(int index=0;index<MAX_KEY;index++){
[8![UcMq if(hCallWnd[index]==0){
p%8y!^g hCallWnd[index]=hWnd;
/ F9BbG{ HotKey[index]=cKey;
V4iN2 HotKeyMask[index]=cMask;
0jG8Gmh! bAdded=TRUE;
Z+JPxe#7 KeyCount++;
<$R'y6U: break;
\vsfY }
"p0e6Z= }
R FWJ ZN" return bAdded;
o^H.uBO{ }
OUQySac //删除热键
/GqW1tcO BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
L~=h?C< {
c#Y/?F2p BOOL bRemoved=FALSE;
PIl:z?q({ for(int index=0;index<MAX_KEY;index++){
g=Rl4F] if(hCallWnd[index]==hWnd){
]9F$/M# if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
xbsp[0I, hCallWnd[index]=NULL;
yO.q{|kX HotKey[index]=0;
\9jEpE^Ju( HotKeyMask[index]=0;
"KSzn bRemoved=TRUE;
H+6+I53 KeyCount--;
qYF150 break;
w`x4i fZ0q }
Gg$4O 8 }
90X<Qs }
J4"?D9T3G return bRemoved;
&C6Z-bS" }
LB$#]
Z Z7J8%ywQ K+p7yZJ DLL中的钩子函数如下:
f@rR2xZoQ
}Ox5,S}ra LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
f:bUM/Ud {
k>SPtiAs BOOL bProcessed=FALSE;
!59u z4 if(HC_ACTION==nCode)
=~yRgGwJ {
?$J#jhR? if((lParam&0xc0000000)==0xc0000000){// 有键松开
QbrR=[8b switch(wParam)
[3o^06V8j {
#%5[8~& case VK_MENU:
0w<vc}{t MaskBits&=~ALTBIT;
&P' d&B1
break;
6 b-'Hu i+ case VK_CONTROL:
wkc)2z MaskBits&=~CTRLBIT;
z>}H[0[# break;
Y#7sDd!N| case VK_SHIFT:
=jz [}5 MaskBits&=~SHIFTBIT;
)jm!bR` break;
N.(wR default: //judge the key and send message
-Ph"#R& break;
bS7%%8C }
@?e+;Sx for(int index=0;index<MAX_KEY;index++){
k}18
~cWM if(hCallWnd[index]==NULL)
ld continue;
=e*S h0dK if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
hX4V}kj {
[`(W(0U% SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
3'2>3Y/7Bb bProcessed=TRUE;
`cgyiJ }
sYa;vg4[ }
<Ukeq0 }
Smg z} else if((lParam&0xc000ffff)==1){ //有键按下
#7v=#Jco switch(wParam)
o&-D[|E| {
<!;NJLe` case VK_MENU:
r?7tI0 MaskBits|=ALTBIT;
SJ*qgI?}T break;
;T hn C>U case VK_CONTROL:
`]F}O \H MaskBits|=CTRLBIT;
M,w5F5 break;
nOTe 3?i> case VK_SHIFT:
f0M5^ MaskBits|=SHIFTBIT;
<*_DC)&79 break;
o*_arzhA default: //judge the key and send message
Be;l!]i break;
Y+)qb); }
40=*Ul U- for(int index=0;index<MAX_KEY;index++){
*{x8@|K8 if(hCallWnd[index]==NULL)
tY@+d*u continue;
jEMnre3/ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
;suY
{
i4Da 'Uk SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
E\1e8Wyh bProcessed=TRUE;
1 EL#T& }
!:2_y'hA }
fD3>g{ }
F81Kxcs if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
pgd9_'[5 for(int index=0;index<MAX_KEY;index++){
{c}n."` if(hCallWnd[index]==NULL)
s.$:.*k continue;
1$_|h@ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
cB0"vbdO SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
-J":'xCP! //lParam的意义可看MSDN中WM_KEYDOWN部分
Lrjp }
z"\<GmvB }
k5g vo }
p54e'Zb return CallNextHookEx( hHook, nCode, wParam, lParam );
Lo*vt42{4 }
&iO53I^r/
#sm@|'Q% 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
|BEoF[1 ] kdU]}z BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
+OaBA>Jh9 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
gY {/)" U _sM==~ 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
}Jo}K)>! fA)4'7UT LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
K?@x'q1 {
O^Y@&S RrQ if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
=xjtPmZ5X {
G?+0#?'Y //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
~P fk
SaveBmp();
\=c@ return FALSE;
)0o|u > }
*4y0Hq …… //其它处理及默认处理
?>Bt|[p:s) }
]|QA`5=$ O:j=L{,d^ q|_Cj]{ 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
o0kKf+[ +2#pP 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
&ox5eX( .efbORp 二、编程步骤
7V%b!R} <YAs0 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
a\m0X@Q ,a3M*}Y~3 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
]D_
AZI
=AP0{ 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
[{PmU~RMYf iw^"?:'% 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
'tDVSj xzw2~(lo 5、 添加代码,编译运行程序。
0zpA<"S b"(bT6XO! 三、程序代码
$Yj4&Two< *5mJA -[B+ ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
T5eJIc3a" #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
^S:I38gR#q #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
QSx4M #if _MSC_VER > 1000
%GigRA@no #pragma once
v*&WqVg #endif // _MSC_VER > 1000
2OwO|n #ifndef __AFXWIN_H__
ow9Vj$m #error include 'stdafx.h' before including this file for PCH
OouR4 #endif
YR"IPyj #include "resource.h" // main symbols
vMYEP_lhK, class CHookApp : public CWinApp
6$G@>QCBS {
Z8:'_#^@a[ public:
)U+&XjK CHookApp();
u>.>hQ // Overrides
}LwKi-G? // ClassWizard generated virtual function overrides
snVeOe#'S //{{AFX_VIRTUAL(CHookApp)
es1'z.U J public:
-+n?Q; virtual BOOL InitInstance();
7#sb},J{ virtual int ExitInstance();
Uc0Sb //}}AFX_VIRTUAL
]GiDfYs7% //{{AFX_MSG(CHookApp)
\4|osZ0y // NOTE - the ClassWizard will add and remove member functions here.
Lf+3nN // DO NOT EDIT what you see in these blocks of generated code !
6oLZH6fG //}}AFX_MSG
Bg}(Sy DECLARE_MESSAGE_MAP()
x8Nij:K# };
i}kMo@ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
%(~8a BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
b/UjKNf@ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
jN%+)Kj0C) BOOL InitHotkey();
L[Y|K%;~ BOOL UnInit();
sf,9Ym #endif
pW5PF)([ i&Me7=~ //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
=UV=F/Af^ #include "stdafx.h"
(!koz'f #include "hook.h"
98%6Z8AS6U #include <windowsx.h>
l)qGG$7$ #ifdef _DEBUG
jO5Wemqf #define new DEBUG_NEW
eB5<N?;s #undef THIS_FILE
tVHQ$jJY% static char THIS_FILE[] = __FILE__;
zfA"xD #endif
`$>cQwB,D #define MAX_KEY 100
r' J3\7N!u #define CTRLBIT 0x04
+\66; 7]s #define ALTBIT 0x02
An=Q`Uxt/ #define SHIFTBIT 0x01
ZIJTGa}B
q #pragma data_seg("shareddata")
@,SN8K0T HHOOK hHook =NULL;
x=3+@'
UINT nHookCount =0;
}J] P`v static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
XaYgl&x'!x static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
p/?TU static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
'p4b8:X static int KeyCount =0;
l?zWi[Zf static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
N4wMAT:h #pragma data_seg()
&$. x1$% HINSTANCE hins;
lPn&,\9@~ void VerifyWindow();
V5]:^= BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
6EkD(w //{{AFX_MSG_MAP(CHookApp)
dMoN19F // NOTE - the ClassWizard will add and remove mapping macros here.
*Bx'g|
u // DO NOT EDIT what you see in these blocks of generated code!
o88Dz}a //}}AFX_MSG_MAP
YL@d+
-\ END_MESSAGE_MAP()
\?NT,t=3J ?]2OT5@&s CHookApp::CHookApp()
mG+hLRTXP {
l&m'?.gf // TODO: add construction code here,
"dBCS // Place all significant initialization in InitInstance
4W+%`x_U] }
ppPzI, )4bZ;'B5 CHookApp theApp;
{#%;Hq P LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
}$1Aw%p^ {
Gq^#.o] BOOL bProcessed=FALSE;
ai~JY[ if(HC_ACTION==nCode)
}NETiJ"6 {
8A|i$#.& if((lParam&0xc0000000)==0xc0000000){// Key up
2s8(r8 AI switch(wParam)
!d=Q@oy5 {
M^~ case VK_MENU:
!Mk:rO-L MaskBits&=~ALTBIT;
.@;,'Xw1~ break;
s`"ALn8m case VK_CONTROL:
.X(ocs$} MaskBits&=~CTRLBIT;
da53XEF& break;
pd
X"M> case VK_SHIFT:
&<%U7?{~ MaskBits&=~SHIFTBIT;
kC2_&L break;
Mq$Nra default: //judge the key and send message
m7~[f7U break;
1w|V'e?kb }
&)|3OJ'o for(int index=0;index<MAX_KEY;index++){
o*1t)HL < if(hCallWnd[index]==NULL)
&-6D'@ continue;
O"x/O#66 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
|A@Gch fd {
Zc57] ~ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
3a#j&] bProcessed=TRUE;
9@|X~z5E }
Y/w) VV }
9 ulr6 }
P1mPC else if((lParam&0xc000ffff)==1){ //Key down
_G5MQ%z switch(wParam)
Gg9NG`e6I {
G0eJ<*|_ 3 case VK_MENU:
JTg0T+ MaskBits|=ALTBIT;
1eDc:!^SD break;
rKys:is case VK_CONTROL:
:cK;|{f MaskBits|=CTRLBIT;
R0*+GIRA( break;
O[fgn;@| case VK_SHIFT:
]]Da/^K=Z MaskBits|=SHIFTBIT;
+kTa>U<? break;
}qOC*k: default: //judge the key and send message
$0K%H break;
0IEFCDeCO }
^R4eW|H for(int index=0;index<MAX_KEY;index++)
k6 f;A {
|79!exVMBp if(hCallWnd[index]==NULL)
]=g|e continue;
K*Tvo` if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
(FAd'$lhX} {
x 1"ikp} SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
{G%!M+n< bProcessed=TRUE;
')w*c }
Y">;2Pt; }
*ad"3> }
&p$SFH?s if(!bProcessed){
t9()?6H\ for(int index=0;index<MAX_KEY;index++){
B$ )6X if(hCallWnd[index]==NULL)
-zVa[& continue;
[\&Mo]"0 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
X+K$y:UZ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
a;`-LOO5& }
(UV+/[, }
0Fh*8a}?b }
5!*5mtI return CallNextHookEx( hHook, nCode, wParam, lParam );
N+PW,a }
?%h JZm; B"I>mw BOOL InitHotkey()
:*!u\lV \ {
Y2Y2>^ if(hHook!=NULL){
f. =4p^ nHookCount++;
pstQithS return TRUE;
w%k)J{\ }
^q,KRut else
$0Y&r]' hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
0PnW|N0 if(hHook!=NULL)
~R cd nHookCount++;
3HA$k[%7P return (hHook!=NULL);
[#td }
s%z'1KPS BOOL UnInit()
_rqOzE) {
)8yee~+TN if(nHookCount>1){
OR^Wd nHookCount--;
-j[n^y'v return TRUE;
6mBX{-Z[ }
MOG[cp BOOL unhooked = UnhookWindowsHookEx(hHook);
K0\a+6kh if(unhooked==TRUE){
Wx/!Myu nHookCount=0;
z[S,hD\w hHook=NULL;
\wNn c" }
Co19^g* return unhooked;
iEki<e/ }
LZG^\c$ v-)eT BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
g}3c r. {
*ma/_rjK BOOL bAdded=FALSE;
Em@h5V for(int index=0;index<MAX_KEY;index++){
K.R2)o` if(hCallWnd[index]==0){
E!VAA= hCallWnd[index]=hWnd;
[JVI@1T HotKey[index]=cKey;
,/W<E HotKeyMask[index]=cMask;
lrh6lt) bAdded=TRUE;
fu=}E5ScK KeyCount++;
tTyu,%/m break;
.KT+,Y }
c)SSi@<
cv }
:*&wnQMKR return bAdded;
im+2)9f }
_'H<zZo u ?g!E."v BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
H8K<.RY {
@\!wW-:A BOOL bRemoved=FALSE;
0 $e;#} for(int index=0;index<MAX_KEY;index++){
z[v5hhI)4 if(hCallWnd[index]==hWnd){
uU.9*B=H9 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
W'XMC" hCallWnd[index]=NULL;
,mYoxEB kl HotKey[index]=0;
!Y]}&pUP HotKeyMask[index]=0;
+ZE&]BO{ bRemoved=TRUE;
d0 V>;Q KeyCount--;
:/%Vpdd@ break;
\Zf&&7v }
qW7"qw= }
;$&-c/]F# }
sD{b0mZT return bRemoved;
pN0c'COy^ }
:
1fik d<7J)zUm3 void VerifyWindow()
+H&_Z38n {
i8B%|[nm for(int i=0;i<MAX_KEY;i++){
rpEFyHorJ if(hCallWnd
!=NULL){ +zs6$OI]V
if(!IsWindow(hCallWnd)){ 6eDIS|/
hCallWnd=NULL; GYO\l.%V5y
HotKey=0; 4E
|6l
HotKeyMask=0; ;7`<.y
KeyCount--; g=Qga09
} -Ez|
} f6L_uk`{
} zW0AB8l
} &vMH
AZd
INbjk;k
BOOL CHookApp::InitInstance() ~2H7_+.#
{ Jl]]nOBQ/
AFX_MANAGE_STATE(AfxGetStaticModuleState()); &YT7>z,
hins=AfxGetInstanceHandle(); Bd
NuhV`0
InitHotkey(); i9!Urq-
return CWinApp::InitInstance(); p fBO5Ys
} _kY5
6
zi?'3T%Ie
int CHookApp::ExitInstance() 3yKI2en"
{ AVyZ#`,
VerifyWindow(); MW`a>'0t?
UnInit(); 7 $9fGo
return CWinApp::ExitInstance(); "}OFwes
} q5vs;,_
|
/2@%:b)
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file >|Jw,,uf
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 4|$D.`Wu
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 0[1!K&(L
#if _MSC_VER > 1000 d(@A
#pragma once m@O\Bi}=}
#endif // _MSC_VER > 1000 9>i6oF]Oq
L\Jl'r|
class CCaptureDlg : public CDialog Pm1
"
0
{ <Y#R]gf1
// Construction !GIsmqVY
public: HQ
s)T
BOOL bTray; Z@[,"{Sn
BOOL bRegistered; :>X7(&j8
BOOL RegisterHotkey(); I
}/Oi]jA6
UCHAR cKey; li%-9Jd
UCHAR cMask; &16bZw
void DeleteIcon(); MtYP3:
void AddIcon();
5pok%g
UINT nCount; "qj[[LQ
void SaveBmp(); `5 6QX'?
CCaptureDlg(CWnd* pParent = NULL); // standard constructor )2FO+_K?T
// Dialog Data tH'VV-!MZ
//{{AFX_DATA(CCaptureDlg) poe Xi\e!(
enum { IDD = IDD_CAPTURE_DIALOG }; OpL 6Y+<
CComboBox m_Key; w//w$}v
BOOL m_bControl; Y=rr6/k
BOOL m_bAlt; -1_Z*?=-
BOOL m_bShift; Z>,X$Y6<
CString m_Path; 4w
z
6%
CString m_Number; qXI30Yo#d
//}}AFX_DATA ^J
RTi'v
// ClassWizard generated virtual function overrides UeICn@)\y
//{{AFX_VIRTUAL(CCaptureDlg) $1?X%8V
public: ~d8>#v=Q`
virtual BOOL PreTranslateMessage(MSG* pMsg); e6R"W9
protected: pMB=iS<E
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 7P`1)juA9
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); (Z$6JNkz
//}}AFX_VIRTUAL {6n \532@
// Implementation ;Bb5KD
protected: qE{cCS
HICON m_hIcon; jkP70Is
// Generated message map functions KNg5Ptk
//{{AFX_MSG(CCaptureDlg) 5qr!OEF2
virtual BOOL OnInitDialog(); vf yva
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 2wBU@T1
afx_msg void OnPaint(); w+37'vQ
afx_msg HCURSOR OnQueryDragIcon(); yo.SPd="Vx
virtual void OnCancel(); ,>UmKrYo
afx_msg void OnAbout(); *i{.@RX?
afx_msg void OnBrowse(); ^<VE5OM
afx_msg void OnChange(); 2`I;f/Sd
//}}AFX_MSG 1!`768
DECLARE_MESSAGE_MAP() -(uBTO s
}; BLH=:zb5
#endif :'dc=C
1QJ$yr
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file )A0&16<
#include "stdafx.h" /
3k\kkv!
#include "Capture.h" 5lxq-E3
#include "CaptureDlg.h" z{g<y^Im+E
#include <windowsx.h> I7PWOd
#pragma comment(lib,"hook.lib") 5tU"|10m3
#ifdef _DEBUG 5)zB/Ta<
#define new DEBUG_NEW nTU~M~gky
#undef THIS_FILE %'T>kz *A
static char THIS_FILE[] = __FILE__; @L!#i*> 9
#endif W[>Tq T63
#define IDM_SHELL WM_USER+1 |I}+!DDuv
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); SU'1#$69F
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); m[{&xF|_
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; t4k'9Y:\Q
class CAboutDlg : public CDialog <PN;D#2bh
{ />[6uvy#Q
public: 4) iEj
CAboutDlg(); ijqdZ+
// Dialog Data 'TrrOq4
//{{AFX_DATA(CAboutDlg) G
r|@CZq
enum { IDD = IDD_ABOUTBOX }; I=%sDn
//}}AFX_DATA JX)z<Dz$
// ClassWizard generated virtual function overrides Cj1UD;
//{{AFX_VIRTUAL(CAboutDlg) B^(rUR
protected: $l;tP
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support MJ9SsC1
//}}AFX_VIRTUAL %B&?D@
// Implementation I*t)x,~3
protected: _*$B|%k
//{{AFX_MSG(CAboutDlg) ba9<(0`
//}}AFX_MSG 1ysLZ;K
DECLARE_MESSAGE_MAP() ]XGn2U\
}; 9BD|uU;0
}PIB b
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) (I[h.\%
{ '(pdk
//{{AFX_DATA_INIT(CAboutDlg) d+2O^of:T
//}}AFX_DATA_INIT J8v:a`bX&
} h==GdS4
8}oDRN!J
void CAboutDlg::DoDataExchange(CDataExchange* pDX) f5GR#3-h(
{ x0A%kp&w
CDialog::DoDataExchange(pDX); #KNq:@wp6
//{{AFX_DATA_MAP(CAboutDlg) gZEA;N:H%<
//}}AFX_DATA_MAP DVoV:pk
} m=iov2K>
P>T*:!s ;
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 06@0r
//{{AFX_MSG_MAP(CAboutDlg) To8v#.i
// No message handlers wt.{Fqm
//}}AFX_MSG_MAP M}oj!xGB
END_MESSAGE_MAP() c^Gwri4
,q@(L
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ms\/=96F
: CDialog(CCaptureDlg::IDD, pParent) ar
qLp|
{ y[WYH5&DJ
//{{AFX_DATA_INIT(CCaptureDlg) D
,ZNh1xt
m_bControl = FALSE; #8f"}>U9.,
m_bAlt = FALSE; .-u k
m_bShift = FALSE; cevV<Wy+
m_Path = _T("c:\\"); :IT U0%;!+
m_Number = _T("0 picture captured."); lzy$.H"W
nCount=0; DET!br'z5
bRegistered=FALSE; VtzmY
bTray=FALSE; !+45=d 5
//}}AFX_DATA_INIT YNJpQAuSn)
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 YTjuSV
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); CAFE}|
} aH PSnB&
uCP6;~Ns
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ,6orB}w?z
{ LB*#
CDialog::DoDataExchange(pDX); ~2A$R'x b
//{{AFX_DATA_MAP(CCaptureDlg) V0'p1J tD
DDX_Control(pDX, IDC_KEY, m_Key); .FbZVY c]
DDX_Check(pDX, IDC_CONTROL, m_bControl); 8X
?GY8W:
DDX_Check(pDX, IDC_ALT, m_bAlt); :
9?Cm`
DDX_Check(pDX, IDC_SHIFT, m_bShift); ,Z*3,/a
DDX_Text(pDX, IDC_PATH, m_Path); @2~O^5[>
DDX_Text(pDX, IDC_NUMBER, m_Number); M`C~6Mf+
//}}AFX_DATA_MAP $|cp;~ 1
} &Rl3y\
r
[5p7@6:$u
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 'q};L 6
//{{AFX_MSG_MAP(CCaptureDlg) \,%o>M'
ON_WM_SYSCOMMAND() qtwT#z;Y
ON_WM_PAINT() ;[OJ-|Q
ON_WM_QUERYDRAGICON() @maZlw1q
ON_BN_CLICKED(ID_ABOUT, OnAbout) itC *Z6^
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) %I|+_ z&x
ON_BN_CLICKED(ID_CHANGE, OnChange) vBnKu
//}}AFX_MSG_MAP $XQ;~i
END_MESSAGE_MAP() q:-]d0B+
IGK_1@tq
BOOL CCaptureDlg::OnInitDialog() Y0L5W;iM
{ Z}K.^\S9
CDialog::OnInitDialog(); ,+NE: _
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); tgvpf/cQ
ASSERT(IDM_ABOUTBOX < 0xF000); bco[L@6G$
CMenu* pSysMenu = GetSystemMenu(FALSE); @RoRNat
if (pSysMenu != NULL) 0(hv #C4
{ orQV'
CString strAboutMenu; 17n+4J]
strAboutMenu.LoadString(IDS_ABOUTBOX); V^Mf4!A(y
if (!strAboutMenu.IsEmpty()) J+cAS/MYX
{ {Ukc D+.Y
pSysMenu->AppendMenu(MF_SEPARATOR); }[KDE{,V
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 6&
&} P79
} Pi"~/MGP$
} A^4kYOe
SetIcon(m_hIcon, TRUE); // Set big icon EBIa%,
SetIcon(m_hIcon, FALSE); // Set small icon vNK`Y|u@
m_Key.SetCurSel(0); ezg^5o;
RegisterHotkey(); p'Y&Z?8
CMenu* pMenu=GetSystemMenu(FALSE); '?`@7Eol
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); FD
XWFJ
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); E*r
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); @tE&<[e
return TRUE; // return TRUE unless you set the focus to a control Rg8m4x w
} s}[A4`EWH
;o_V!<$
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 43{_Y]
{ PQU3s$
if ((nID & 0xFFF0) == IDM_ABOUTBOX) w;yiX<t<
{ z@Z_] h
CAboutDlg dlgAbout; kyRh k\X
dlgAbout.DoModal(); S6Xb*6
} cXOje"5i
else -40'[a9E
{ ]F"(OWW
CDialog::OnSysCommand(nID, lParam); r sX$fU8
} TXd5v#_vo
} oeu|/\+HW
daA47`+d
void CCaptureDlg::OnPaint() P|e:+G 7
{ LXh@o1
if (IsIconic()) KJ0xp hf
{ (^DLCP#*
CPaintDC dc(this); // device context for painting WA]%,6
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);
JVUZ}#O
// Center icon in client rectangle F_Z&-+,*3t
int cxIcon = GetSystemMetrics(SM_CXICON); `N|U"s;
int cyIcon = GetSystemMetrics(SM_CYICON); nJtEUVMt
CRect rect; 7x[LF ^o
GetClientRect(&rect); ( Lok
int x = (rect.Width() - cxIcon + 1) / 2; \A'|XdQ
int y = (rect.Height() - cyIcon + 1) / 2;
!fQJL
// Draw the icon .6O52E
dc.DrawIcon(x, y, m_hIcon); H )BOSZD
} ),nCq^Bp
else iA55yT+
{ }
*
?n?'
CDialog::OnPaint(); e5qrQwU
} Sk6b`W7$
} ;mf4U85
=_$XP
HCURSOR CCaptureDlg::OnQueryDragIcon() dN$ 1$B^k
{ a"0B?3*r46
return (HCURSOR) m_hIcon; 4
[R8(U[g
} RLYU\@kK?
18DTv6?QG
void CCaptureDlg::OnCancel() M>*0r<qn
{ E^Q@9C<!d
if(bTray) j!zA+hF(
DeleteIcon(); g,t3OnxS?
CDialog::OnCancel();
Veb+^&
} Lv
`#zgo_f
2-vJv+-
void CCaptureDlg::OnAbout() ~t'#n V
{ <^,o$b
CAboutDlg dlg; ${A5-
dlg.DoModal(); q[{:
} d&}pgb-Md
=y)p>3p}&
void CCaptureDlg::OnBrowse()
F^ I\X
{ 1% $d D2
CString str; &Q\_;
BROWSEINFO bi; ! (2-(LgA
char name[MAX_PATH]; 9
9Ba{qj
ZeroMemory(&bi,sizeof(BROWSEINFO)); !MZ+- dpK
bi.hwndOwner=GetSafeHwnd(); E
S#rs="
bi.pszDisplayName=name; $x?NNS_ "J
bi.lpszTitle="Select folder"; ?8 SK\{9r6
bi.ulFlags=BIF_RETURNONLYFSDIRS; AuoxZ?V
LPITEMIDLIST idl=SHBrowseForFolder(&bi); 1 L+=|*:
if(idl==NULL) A)\>#Dv
return; ;;ER"N
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); "KMLk
str.ReleaseBuffer(); YniZ(
~^K
m_Path=str; |ZS 57c:
if(str.GetAt(str.GetLength()-1)!='\\') 7%{R#$F
m_Path+="\\"; Hze-Ob8
UpdateData(FALSE); G 6Wx3~
} ( MB`hk-d
W3 ^z Ij
void CCaptureDlg::SaveBmp() `d75@0:
{ c5X`_
CDC dc; q:vz?G
dc.CreateDC("DISPLAY",NULL,NULL,NULL); 1*Sr5N[=
CBitmap bm; \n[
392
int Width=GetSystemMetrics(SM_CXSCREEN); ?k
[%\jq{a
int Height=GetSystemMetrics(SM_CYSCREEN); .CVUEK@Z4
bm.CreateCompatibleBitmap(&dc,Width,Height); k1wCa^*gc
CDC tdc; "e~k-\^Y
tdc.CreateCompatibleDC(&dc); S3SV.C:z>
CBitmap*pOld=tdc.SelectObject(&bm); ;knd7SC
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); |J:$MX~
tdc.SelectObject(pOld); RS'} nY}
BITMAP btm; cvKV95bn
bm.GetBitmap(&btm); 1s Br.+p
DWORD size=btm.bmWidthBytes*btm.bmHeight; D+f'*|
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); o:_^gJ+|
BITMAPINFOHEADER bih; sT)6nV
bih.biBitCount=btm.bmBitsPixel; ,VAp>x+O
bih.biClrImportant=0; N*~_\x
bih.biClrUsed=0; >Y}7[XK
bih.biCompression=0; UQ5BH%EPb
bih.biHeight=btm.bmHeight; %moJF1
bih.biPlanes=1; !tI=`Ml[
bih.biSize=sizeof(BITMAPINFOHEADER); 3DH.4@7P
bih.biSizeImage=size; 8O;Vl
bih.biWidth=btm.bmWidth; 0eFb?Z0]
bih.biXPelsPerMeter=0; GP* +
bih.biYPelsPerMeter=0; BEln6zj
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); bFSlf5*H
static int filecount=0; pFpZbU^
CString name; ,!`SY)
name.Format("pict%04d.bmp",filecount++); #e*X0;m
name=m_Path+name; Ejq=*UOP
BITMAPFILEHEADER bfh; lj)f4zu
bfh.bfReserved1=bfh.bfReserved2=0; vK(I3db!
bfh.bfType=((WORD)('M'<< 8)|'B'); CoJ55TAW
bfh.bfSize=54+size; ^"1TPd|
bfh.bfOffBits=54; !(Q l)C
CFile bf; $'^&\U~?
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 3@G;'|z
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); WE")xhV6
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); )%s +?
bf.WriteHuge(lpData,size); B#]_8svO
bf.Close(); tVunh3-
nCount++; :y\09)CJK
} Xem 05%,
GlobalFreePtr(lpData); wy''tqg6
if(nCount==1) `K w7"
m_Number.Format("%d picture captured.",nCount); Y~az!8j;Z
else kBbl+1{H
m_Number.Format("%d pictures captured.",nCount); U h.Sc:trA
UpdateData(FALSE); *wwhZe4V
} yLW/ -%I#u
$&IpX M]
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) va5FxF*%
{ _Fizgs
if(pMsg -> message == WM_KEYDOWN) \83sSw
{
a"QU:<-v
if(pMsg -> wParam == VK_ESCAPE) =O,JAR"ug
return TRUE; uArR\k(
if(pMsg -> wParam == VK_RETURN) MHo1 lrZa+
return TRUE; [h4o7
} 1~'_K9eE
return CDialog::PreTranslateMessage(pMsg); |q_
!.
a
} =2,0Wo]$
W<NmsG})_g
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ,d|vP)SS
{ =Ey`M#t;
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ n>P!u71
SaveBmp(); Noh?^@T`Ov
return FALSE; IZ 8y}2
} _R7 w?!t8
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ t}Ss=0dJO
CMenu pop; :mpiAs<%U"
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); =OYQM<q
CMenu*pMenu=pop.GetSubMenu(0); W/r^ugDV
pMenu->SetDefaultItem(ID_EXITICON); t[EfOQ
CPoint pt; &!jq!u$(
GetCursorPos(&pt); c&f
y{}10
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); !%xP}{(7
if(id==ID_EXITICON) ' "'Btxz
DeleteIcon(); H] k'?;
else if(id==ID_EXIT) jJ~Y]dQi
OnCancel();
-4flV D
return FALSE; ;xK_qBIP
} Qw?+!-7TN
LRESULT res= CDialog::WindowProc(message, wParam, lParam); w(BH247`
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) {B0h+. C
AddIcon(); JRO$<
return res; pUCK-rL
} dig~J\
KFDS q"j
void CCaptureDlg::AddIcon() |y"jZT6R}t
{ TY.F pW
NOTIFYICONDATA data; ,=o0BD2q
data.cbSize=sizeof(NOTIFYICONDATA); e7xj_QH
CString tip; bU`=*
tip.LoadString(IDS_ICONTIP); v7IzDz6gF
data.hIcon=GetIcon(0); )`8pd 7<.
data.hWnd=GetSafeHwnd(); F>+2DlA`<e
strcpy(data.szTip,tip); 6GYtY>
data.uCallbackMessage=IDM_SHELL; ([ dT!B#aH
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; EfiU$8y
data.uID=98; \ZD[!w7
Shell_NotifyIcon(NIM_ADD,&data); `HW:^T
ShowWindow(SW_HIDE); Ftv8@l
bTray=TRUE; F98i*K`"
} 1pP1d%
>qR~'$,$
void CCaptureDlg::DeleteIcon() 9s` /~ a@
{ j'GtgT
NOTIFYICONDATA data; j7
d:v7+_
data.cbSize=sizeof(NOTIFYICONDATA); J!h^egP
data.hWnd=GetSafeHwnd(); '<@=vGsye
data.uID=98; dTGA5c
Shell_NotifyIcon(NIM_DELETE,&data); ip``v0Nf
ShowWindow(SW_SHOW); Yv)aAWEa
SetForegroundWindow(); *Msr15
ShowWindow(SW_SHOWNORMAL); Dag`>|my
bTray=FALSE; WM,i:P)b
} 4/*H.Fl
~p*1:ij
void CCaptureDlg::OnChange() Pxhz@":[
{ |d7$*7TvV
RegisterHotkey(); }+RB=#~o
} 6)e5zKW!?
wAYB RY[
BOOL CCaptureDlg::RegisterHotkey() C+%K6/J(
{ lIf(6nm@
UpdateData(); ^0tw%6:
UCHAR mask=0; KJh,,xI>by
UCHAR key=0; mm[SBiFO\
if(m_bControl) otr>3a*'
mask|=4; 7=P^_LcU
if(m_bAlt) o
}@n>R
mask|=2; 6EJVD!#[K
if(m_bShift) ]Kdet"+
mask|=1; Ip?]K*sq
key=Key_Table[m_Key.GetCurSel()]; op7FZHs
if(bRegistered){ UG2w 1xqHw
DeleteHotkey(GetSafeHwnd(),cKey,cMask); lBA +zZ
bRegistered=FALSE; NY.k.
} wJG$c-(\0
cMask=mask; eW8[I'v_&
cKey=key; f h<*8w0H
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); o a<q /
return bRegistered; "T6#
} N/~N7MwJj
Zk?
=
四、小结 QH@>icAb
.px:e)iW
本实例通过一个钩子DLL实现了屏幕抓图的功能,它有一个缺陷,那就是只能保存整个屏幕图像,不过读者朋友可以在此基础上,实现屏幕任意区域的抓图功能,具体方法不再赘述,实现起来很容易的了,呵呵。