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:
5AS[\CB4
4to% `)] 一、实现方法
Xv <G-N4 N..j{FE 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:
/yz=Cj oz UtB6V)YI #pragma data_seg("shareddata")
=(a1+.O HHOOK hHook =NULL; //钩子句柄
aV o;~h~ UINT nHookCount =0; //挂接的程序数目
*%w69#D static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
heaR X4 static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
U-k+9f 0 static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
UX3BeUi.) static int KeyCount =0;
;@,Q&B2eM static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
07Gv* . #pragma data_seg()
w;}@'GgL 93+"D` 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。
b `2|I { c^rOImZ 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:
9=w|)p ) +uWDP. BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
RCTQhTy= cKey,UCHAR cMask)
v%k9M{ {
N"/-0(9[ BOOL bAdded=FALSE;
8zLY6@ for(int index=0;index<MAX_KEY;index++){
^=n+T7"J if(hCallWnd[index]==0){
@D-AO_ hCallWnd[index]=hWnd;
GLn{s HotKey[index]=cKey;
i&njqK!wS HotKeyMask[index]=cMask;
>-_d CNZ bAdded=TRUE;
F62V3 Xy KeyCount++;
IW8+_#d break;
7"7rmZ }
cYx4~ V^ }
^_5L"F]sP return bAdded;
ihh4pD27g }
mNf8kwr //删除热键
k4qp u=@U BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
\Gm-MpW {
%p^.\ch9 BOOL bRemoved=FALSE;
9jN)I(^D6 for(int index=0;index<MAX_KEY;index++){
R(P%Csbqh if(hCallWnd[index]==hWnd){
$Y=T&O if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
:+{ ? hCallWnd[index]=NULL;
,*4p?|A HotKey[index]=0;
ZT02"3F HotKeyMask[index]=0;
1:NrP'W^ bRemoved=TRUE;
=NbI% KeyCount--;
a9n^WOJ6 break;
qQpnLV 4 }
B63pgPX }
YY?a>j."a }
/&u<TJ4 return bRemoved;
N=:5eAza }
0JgL2ayIVI `28};B> %}86D[PF DLL中的钩子函数如下:
M
:3u@06a B!gGK|8 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
$F.([?)k? {
ELh8ltLY BOOL bProcessed=FALSE;
Xi?b]Z if(HC_ACTION==nCode)
pE{yv1Yg {
)$w*V9d if((lParam&0xc0000000)==0xc0000000){// 有键松开
"#v=IJy&r switch(wParam)
vHAg-Avc {
7iHK_\t n case VK_MENU:
2L AYDaS MaskBits&=~ALTBIT;
k5kdCC0FCk break;
-(`OcGM'L case VK_CONTROL:
L=2y57&Y MaskBits&=~CTRLBIT;
{_(\`> break;
as=m`DqOh case VK_SHIFT:
?[*0+h`en MaskBits&=~SHIFTBIT;
&t5{J53 break;
!-m&U4Ku6o default: //judge the key and send message
7&KT0a* break;
'(f/~"9B }
2tROT][J% for(int index=0;index<MAX_KEY;index++){
ZKg{0DY if(hCallWnd[index]==NULL)
Ca%g_B0t continue;
}SI GPVM if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
axHK_1N{ {
]$U xCu SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
0-LpqX bProcessed=TRUE;
7W6cM%_B }
R*|LI }
Z~A@o""F }
\4"S7.% | else if((lParam&0xc000ffff)==1){ //有键按下
`@i5i(( switch(wParam)
Z%GTnG|rG {
A2}Rl%+X]6 case VK_MENU:
MNH1D!} MaskBits|=ALTBIT;
Y(\T-
bI break;
jjJ2>3avY case VK_CONTROL:
qQ!1t>j+H MaskBits|=CTRLBIT;
Soie^$
Y break;
{0! ~C=P case VK_SHIFT:
bYz&P`o} MaskBits|=SHIFTBIT;
Zo KcJA break;
~&\ f|% default: //judge the key and send message
a[lY S{ break;
x8;`i$ }
'0$?h9" for(int index=0;index<MAX_KEY;index++){
&V>fYgui if(hCallWnd[index]==NULL)
yr#5k`&\_ continue;
"EU{8b if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
G/%iu;7ZCb {
.I}:m%zv SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
%4\OPw& bProcessed=TRUE;
9WJz~SP+vR }
E~<`/s }
IrMl:+t\ }
1FtM>&%4 if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
uxg9yp@| for(int index=0;index<MAX_KEY;index++){
X0-IRJ[ if(hCallWnd[index]==NULL)
dD<fn9t
continue;
TO2c"7td if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
Mg#j3W}] SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
2MA]j T //lParam的意义可看MSDN中WM_KEYDOWN部分
9w9jpe# }
)otb>w5 }
DO7W}WU }
r_EcMIuk return CallNextHookEx( hHook, nCode, wParam, lParam );
fw oQ'& }
8A{_GH{: qyHZ M}/ 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
nUq<TJ c*d9'}E BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
iYnEwAoN; BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
;,&8QcSVY &[2U$ `P`V 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:
iJnU% uP\lCqK, LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
iqnJ~g {
T]Nu) if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
?^:h\C^a" {
&D%(~|' //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
K
~ 44i SaveBmp();
&rDM<pO #- return FALSE;
:b[`
v }
H A}f,),G …… //其它处理及默认处理
,3I^?5 }
pf4 ^Bk}e oJKa"H-jL "m{,~'x 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。
7VK}Dy/Vvn .oEmU+ 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。
X0{/ydGF8 k`". 二、编程步骤
nN$Y(2ZN 8Ry74|`=R 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";
5>6PH+Oq Iqs+r? 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
mVtXcP4b e&eW|E 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;
xUF_1hY RvJ['(- 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;
N8KQz_]9I @`FCiH M 5、 添加代码,编译运行程序。
vaf&X]p )'l*Tl 三、程序代码
A?G IBjs b]E|* ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
?)'~~@NkH #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
39{{7(hh #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
B7\k< Nit0 #if _MSC_VER > 1000
OdMO=Hy6d #pragma once
?Z\Yu' #endif // _MSC_VER > 1000
2!N8rHRt #ifndef __AFXWIN_H__
J==SZ v #error include 'stdafx.h' before including this file for PCH
UR(-q #endif
W~_t~Vg5 #include "resource.h" // main symbols
1GEK:g2B class CHookApp : public CWinApp
R];Oxe {
elG;jB public:
UEak^Mm;=2 CHookApp();
$ _8g8r} // Overrides
<"o"z2 // ClassWizard generated virtual function overrides
hO{cvHy` //{{AFX_VIRTUAL(CHookApp)
.s/fhk, public:
*9ywXm&? virtual BOOL InitInstance();
Ba\6?K virtual int ExitInstance();
3p?KU- //}}AFX_VIRTUAL
=O|c-k,f@ //{{AFX_MSG(CHookApp)
j?b\+rr // NOTE - the ClassWizard will add and remove member functions here.
`"vZ);i< // DO NOT EDIT what you see in these blocks of generated code !
pIWI //}}AFX_MSG
Es 5 DECLARE_MESSAGE_MAP()
KCe13! };
1Xy]D LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
_DRrznaw BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
W;?(,xx BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
:5GZ \Z8F BOOL InitHotkey();
'2hbJk BOOL UnInit();
>Ps7I #endif
uhN%Aj\iu( NGYyn`Lx //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
h5
Vv:C #include "stdafx.h"
+b;hBb]R #include "hook.h"
W{XkVKe1a #include <windowsx.h>
S\y%4}j #ifdef _DEBUG
Z,N$A7SBE #define new DEBUG_NEW
7iuQ9q^& #undef THIS_FILE
w^K^I_2ge static char THIS_FILE[] = __FILE__;
I
PE}gp #endif
_eLWQ|6Fx #define MAX_KEY 100
ashcvn~z #define CTRLBIT 0x04
fJjgq)9 #define ALTBIT 0x02
iq?#rb P#I #define SHIFTBIT 0x01
9^P2I)aD #pragma data_seg("shareddata")
!BU)K'mj HHOOK hHook =NULL;
Kex[ >L10G UINT nHookCount =0;
0ZAj=u@O static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
l2b{u
GE static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
R)!`JKeO/ static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
t?;T3k[RM static int KeyCount =0;
4X
NxI1w) static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
b(GFMk #pragma data_seg()
Np)3+!^1" HINSTANCE hins;
'#\D]5 void VerifyWindow();
OH<?DcfeL BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
T0j2a&Pv //{{AFX_MSG_MAP(CHookApp)
3L-^<'~-k; // NOTE - the ClassWizard will add and remove mapping macros here.
yh;Y,;4 // DO NOT EDIT what you see in these blocks of generated code!
Z.&\=qiY //}}AFX_MSG_MAP
x@P{l&:> END_MESSAGE_MAP()
6FfOH<\z6i } :iBx CHookApp::CHookApp()
NTs;FX~g[ {
nbofYI$rd& // TODO: add construction code here,
v4?iOD // Place all significant initialization in InitInstance
^CzYDq }
~Y5l+EF# V6iL5& CHookApp theApp;
kL@Wb/K JP LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
dOa!htx] {
S_J :&9L BOOL bProcessed=FALSE;
"YFls#4H- if(HC_ACTION==nCode)
h?@G$%2 {
;mm!0]V if((lParam&0xc0000000)==0xc0000000){// Key up
&!7+Yb(1 switch(wParam)
<*'cf2Q$Av {
@%tXFizh case VK_MENU:
q5&Ci` MaskBits&=~ALTBIT;
OKuD" break;
HgJb4Fi case VK_CONTROL:
~pP0|B*% MaskBits&=~CTRLBIT;
w=r&?{ break;
2x$x;
\*j case VK_SHIFT:
L3y5 a?G MaskBits&=~SHIFTBIT;
^<V9'Ut break;
_|c&@M default: //judge the key and send message
vfvlB[ break;
<FFJzNc+ }
cErI%v}v0 for(int index=0;index<MAX_KEY;index++){
bk#xiuwT if(hCallWnd[index]==NULL)
fhp)S", continue;
mAqDjRV1 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
sB}]yw {
$,1dQeE SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
wV<7pi bProcessed=TRUE;
&R$Q\, }
kv|,b }
_ P ,@ }
^,s?e.u$8` else if((lParam&0xc000ffff)==1){ //Key down
g%J./F=@3 switch(wParam)
sn\;bq {
o sdOw8 case VK_MENU:
tR`S#rk MaskBits|=ALTBIT;
#JNy break;
gzfb zt}? case VK_CONTROL:
-R+zeu(e' MaskBits|=CTRLBIT;
;'kI/(;;C break;
T@+ClZi case VK_SHIFT:
OS7RQw1 MaskBits|=SHIFTBIT;
10N,?a break;
u?Hb(xZtg= default: //judge the key and send message
nW;kcS*A break;
3_ 2hC!u!K }
VAj<E0> for(int index=0;index<MAX_KEY;index++)
&/F_*=VE {
P@ypk^v if(hCallWnd[index]==NULL)
tbj=~xYf continue;
.Oo/y0E^ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
i*tv,f.( {
~@c-* SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
g,lY ut bProcessed=TRUE;
0%Q9}l#7 }
8Pmwzpk02 }
9 pKm*n& }
X B I;Lg if(!bProcessed){
@6.]!U4w for(int index=0;index<MAX_KEY;index++){
}0eg{{g8 if(hCallWnd[index]==NULL)
oj.lj! continue;
)5l u.R% if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
~@M7&%] SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
k&Jo"[i&WO }
)LFD6\z1pl }
R$0U<(/ }
t{(Mf2GR1
return CallNextHookEx( hHook, nCode, wParam, lParam );
0<P(M: a }
g{ (@uzqG ?iz<
BOOL InitHotkey()
OhWC}s {
|$w*RI0C if(hHook!=NULL){
aPBX=;( nHookCount++;
JieU9lA^&B return TRUE;
gA
+:CgQ }
`ut)+T V else
i&F~=Q` hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
fGO*%) if(hHook!=NULL)
g5}7y\ nHookCount++;
FN{/.?w( return (hHook!=NULL);
>ZCo 8aK }
9+VF<;Xw BOOL UnInit()
JLW$+62 {
K`+vfqX if(nHookCount>1){
?[SVqj2- nHookCount--;
./iXyta return TRUE;
BR3mAF }
wixD\t59X BOOL unhooked = UnhookWindowsHookEx(hHook);
rgR?wXW]jE if(unhooked==TRUE){
elKx]%k*) nHookCount=0;
y9
uVCR hHook=NULL;
i7v/A&Rc }
~= 9Vv return unhooked;
02M7gBS }
&t[|%c*D& &wGg6$ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
rt;gC[3\ {
vl~%o@*_ BOOL bAdded=FALSE;
HWbBChDF for(int index=0;index<MAX_KEY;index++){
(4ZLpsbJ if(hCallWnd[index]==0){
aJQXJ,>Lv hCallWnd[index]=hWnd;
# ITLz!gE HotKey[index]=cKey;
s>J3\PC HotKeyMask[index]=cMask;
;G Qm[W([ bAdded=TRUE;
Oy'0I, KeyCount++;
_W+Q3Jx-( break;
$~o3}&az }
^Ezcy? }
R<j<.h return bAdded;
sN@j5p^jc }
MgP{W=h2 0~i q G BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
TQ~&Y)". {
,lP7 ri BOOL bRemoved=FALSE;
#Y: ~UVV for(int index=0;index<MAX_KEY;index++){
U,ELqi \ if(hCallWnd[index]==hWnd){
%JaE4& if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
8>v7v&Bh| hCallWnd[index]=NULL;
!h/dZ`# HotKey[index]=0;
%
&+|==- HotKeyMask[index]=0;
qa;EI ;8 bRemoved=TRUE;
{jUvKB_x KeyCount--;
'Aet{A=9 break;
"o<D;lO }
_DrnL}9I7 }
y3AL) }
:+1bg&wQ return bRemoved;
JOgmF_(>Z }
f-s~Q4 kI]=&Rw void VerifyWindow()
{"}+V`O{ {
7(5]Ry: for(int i=0;i<MAX_KEY;i++){
X@eg<]'m if(hCallWnd
!=NULL){ ZK!4>OuH`
if(!IsWindow(hCallWnd)){ / (.'*biQ
hCallWnd=NULL; /J8o_EV
HotKey=0; q4zSS #]A
HotKeyMask=0; nYgx9Q"<om
KeyCount--; gm}C\q9
} FBbm4NB
} &BTfDsxAK
} B~BUWWMfp
} .yG8B:7N2
{;;eOxOP|
BOOL CHookApp::InitInstance() \hu':@}
{ 8}J(c=4Gk
AFX_MANAGE_STATE(AfxGetStaticModuleState()); .8%vd
hins=AfxGetInstanceHandle(); ?^ eJ:
InitHotkey(); f5N<3 m=
return CWinApp::InitInstance(); MsSoX9A{D
} +:b(%|
LP8o7%sv!
int CHookApp::ExitInstance() p0?o<AA%O
{ >Ziy1Dp
VerifyWindow(); 6J]~A0vsi}
UnInit(); V9gVn?O0
return CWinApp::ExitInstance(); @eA %(C
} mnQal>0~
vB]3Xb3a
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file vr<)Ay
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) @ >
cdHv
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ H2s*s[T
-
#if _MSC_VER > 1000 $kM'
#pragma once S]tkz*w0*
#endif // _MSC_VER > 1000 `7F@6n
S54gqc1S]
class CCaptureDlg : public CDialog 4h(jw
{ T R+Q4Y:
// Construction /1H9z`qV
public: rn[$x(G
BOOL bTray; ,WzG.3^m
BOOL bRegistered; `s#sE.=o
BOOL RegisterHotkey(); ]9dx3<2_I
UCHAR cKey; t4C<#nfo
UCHAR cMask; VoWA tNU
void DeleteIcon(); m]Hb+Y=;h
void AddIcon(); o8iig5bp
UINT nCount; oPp!*$V
void SaveBmp(); Qs~d_;
CCaptureDlg(CWnd* pParent = NULL); // standard constructor <e$5~Spc
// Dialog Data ^7J~W'hI
//{{AFX_DATA(CCaptureDlg) 5XhK#X%:A
enum { IDD = IDD_CAPTURE_DIALOG }; i#Ne'q;T
CComboBox m_Key; ll 6]W~[ZC
BOOL m_bControl; EaJDz`T}
BOOL m_bAlt; ~r{\WZ.
BOOL m_bShift; J~M H_N
CString m_Path; |;X?">7NW
CString m_Number; N:"M&EUM
//}}AFX_DATA 7AS.)Q#=x
// ClassWizard generated virtual function overrides Smi%dp.
//{{AFX_VIRTUAL(CCaptureDlg) H^]Nmd8Q)
public: ce 7Yr*ZB
virtual BOOL PreTranslateMessage(MSG* pMsg); n.=e)*
protected: o",f(v&u%
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support N`y}Gs
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); !5yRWMO9X~
//}}AFX_VIRTUAL bEoB;]
// Implementation />2A<{6\=P
protected: Xp<A@2wt?
HICON m_hIcon; ~R"]LbeY
// Generated message map functions :|*Gnu
//{{AFX_MSG(CCaptureDlg) /8 e2dw:
\
virtual BOOL OnInitDialog(); s
ZlJ/_g
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); a3b2nAI l
afx_msg void OnPaint(); u^j8
XOT
afx_msg HCURSOR OnQueryDragIcon(); ^D%}V- "
virtual void OnCancel(); *#ob5TBq[
afx_msg void OnAbout(); 9;>@"e21R
afx_msg void OnBrowse(); #rSasucr
afx_msg void OnChange(); 61ON
//}}AFX_MSG z }FiU[Hs
DECLARE_MESSAGE_MAP() UrD=|-r`
}; ;PuyA
#endif U-wq- GT
M63s(f
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 7.w*+Z>z
#include "stdafx.h" *u:;:W&5y
#include "Capture.h" ;:#?~%7>
#include "CaptureDlg.h" oi33{#%t
#include <windowsx.h> ^&f{beU9
#pragma comment(lib,"hook.lib") *qeic e%E
#ifdef _DEBUG bIvJs9L
#define new DEBUG_NEW uzzWZ9Tv
#undef THIS_FILE yv6Zo0s<J
static char THIS_FILE[] = __FILE__; mq|A8>g
#endif BK`Q)[
#define IDM_SHELL WM_USER+1 0~PXa(!^K
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); I?^Q084
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 3D 4]yR5
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; _WRR
3
class CAboutDlg : public CDialog 4Zv.[V]iOO
{ kxr6sO~
public: =8$(i[;6w
CAboutDlg(); gQ[]
// Dialog Data 97:t29N
//{{AFX_DATA(CAboutDlg) }QX2:a
enum { IDD = IDD_ABOUTBOX }; c<JM1
//}}AFX_DATA KZp,=[t
// ClassWizard generated virtual function overrides XwKZv0ub
//{{AFX_VIRTUAL(CAboutDlg) kuKnJWv
protected: _rWM]
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support (R;)
9I\
//}}AFX_VIRTUAL ShEaL&'J
// Implementation _G-b L;
protected: kz$6}&uk
//{{AFX_MSG(CAboutDlg) Ti9:'I
//}}AFX_MSG ZTgAZ5_cz
DECLARE_MESSAGE_MAP() ;*<{*6;=?
}; Nf/hr%jL
CA~em_dC
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 0x3 h8fs
{ h=iA;B^>
//{{AFX_DATA_INIT(CAboutDlg) Xa@ _^oL
//}}AFX_DATA_INIT 0~@L%~
} [t"_}t =w
lzr>WbM{{p
void CAboutDlg::DoDataExchange(CDataExchange* pDX) :$GL.n-?
{ RJ=c[nb
CDialog::DoDataExchange(pDX); wM2)KM}$
//{{AFX_DATA_MAP(CAboutDlg) U 3wsWSO
//}}AFX_DATA_MAP B4\:2hBq
} ]|((b/L3
hX'z]Am<
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) _4XoUE\\
//{{AFX_MSG_MAP(CAboutDlg) `ohF?5J,
// No message handlers do?S,'(g
//}}AFX_MSG_MAP (:j+[3Ht
END_MESSAGE_MAP() +_-)0[+p
BW;=i.
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) (TbB?X}
: CDialog(CCaptureDlg::IDD, pParent) ||*&g2Y
{ A^= Hu,"e
//{{AFX_DATA_INIT(CCaptureDlg) U:pLnNp`
m_bControl = FALSE; fRv
S@
m_bAlt = FALSE; :)
Fp
B"
m_bShift = FALSE; YQB]t=Ha
m_Path = _T("c:\\"); QJ(e*/
m_Number = _T("0 picture captured."); 'EH
nCount=0; Gg3?2h"d
bRegistered=FALSE; ~'Qpf 8)
bTray=FALSE; ^%4(
%68
//}}AFX_DATA_INIT 5wE !_ng>|
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 &ESR1$)'P
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); @LkW_
} ![X.%
]Nd'%M
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) tx|"v|&e2
{ mAYr<=
CDialog::DoDataExchange(pDX); X"qbB4(I
//{{AFX_DATA_MAP(CCaptureDlg)
J7
*G/F
DDX_Control(pDX, IDC_KEY, m_Key); oRvm*"8B
DDX_Check(pDX, IDC_CONTROL, m_bControl); x#}j3"
PP
DDX_Check(pDX, IDC_ALT, m_bAlt); 2Xj-A\Oh~
DDX_Check(pDX, IDC_SHIFT, m_bShift); qu#@F\gX
DDX_Text(pDX, IDC_PATH, m_Path); ,G!_ SZ
DDX_Text(pDX, IDC_NUMBER, m_Number); ,<
)/45
//}}AFX_DATA_MAP <=y58O]x
} Z>MJ0J76]
$V {- @=
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) T0np<l]A
//{{AFX_MSG_MAP(CCaptureDlg) w'!}(Z5X?
ON_WM_SYSCOMMAND() [r~rIb%Zj
ON_WM_PAINT() \3y=0
ON_WM_QUERYDRAGICON() #`6OC)1J
ON_BN_CLICKED(ID_ABOUT, OnAbout) 6!Tf'#TV~!
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Lct+cKKU
ON_BN_CLICKED(ID_CHANGE, OnChange) 6_`eTL=G
//}}AFX_MSG_MAP qS/71Kv'
END_MESSAGE_MAP() I}g|n0o
45O6TqepN
BOOL CCaptureDlg::OnInitDialog() ^&G O4u
{ x"C93ft[
CDialog::OnInitDialog(); BB73'W8y
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); te)g',#lT
ASSERT(IDM_ABOUTBOX < 0xF000); ~i_R%z:y
CMenu* pSysMenu = GetSystemMenu(FALSE); B"E (Y M
if (pSysMenu != NULL) JY050FL
{ Velbq
CString strAboutMenu; ,n,7.m.D
strAboutMenu.LoadString(IDS_ABOUTBOX); ;uWIl
if (!strAboutMenu.IsEmpty()) <x%my4M
{ loqS?b C]
pSysMenu->AppendMenu(MF_SEPARATOR); -WHwz m
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); \<MTY:
} a\.O L}"
} 8`LLHX1|
SetIcon(m_hIcon, TRUE); // Set big icon !f]3Riw-=,
SetIcon(m_hIcon, FALSE); // Set small icon J\,e/{,X
m_Key.SetCurSel(0); hoD[wAC
RegisterHotkey(); 5-QvQ&eH.
CMenu* pMenu=GetSystemMenu(FALSE); raI~BIfe
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); uwS'*5tU
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); )>A%FL9
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 0 *Yivx6
return TRUE; // return TRUE unless you set the focus to a control C6T 9
} Om?:X!l"
0,D9\ Ebd
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) @}rfY9o'
{ dU04/]modD
if ((nID & 0xFFF0) == IDM_ABOUTBOX) [ Xo
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{ gu.))3D9
CAboutDlg dlgAbout; *.;}OX^X
dlgAbout.DoModal(); Y @ ,e
} h|/*yTuN.y
else ewff(e9
{ UNH}*]u4`
CDialog::OnSysCommand(nID, lParam); Y8CYkJTAD-
} O6/=/-?N=c
} +P6
m5Laq'~0_
void CCaptureDlg::OnPaint() XuAc3~HAd
{ Yr(f iI
if (IsIconic()) +WEO]q?K
{ c.me1fGn
CPaintDC dc(this); // device context for painting 6`$z*C2{
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); FVLA^$5c
// Center icon in client rectangle x?k |i}Q
int cxIcon = GetSystemMetrics(SM_CXICON); P9HPr2
int cyIcon = GetSystemMetrics(SM_CYICON); * jNu?$
CRect rect; P*^UU\x'4I
GetClientRect(&rect); GMp'KEQQ
int x = (rect.Width() - cxIcon + 1) / 2; AxqTPx7`|
int y = (rect.Height() - cyIcon + 1) / 2; MS^hsUj}
// Draw the icon F9G$$%Q-Z
dc.DrawIcon(x, y, m_hIcon); [~r$US
} nv|y@!(
else <h>fip3o
{ "kuBjj2
CDialog::OnPaint(); *q9$SDm
} )da8Ru
} !m.')\4<
2!& ;ZcT,
HCURSOR CCaptureDlg::OnQueryDragIcon() K0!#l Br
{ C&K(({5O
return (HCURSOR) m_hIcon; E]Gq!fA&<
} ;0}"2aGY
Z"8cGN'
void CCaptureDlg::OnCancel() 2OOj8JS
{ y]z# ??
if(bTray) B!C32~[
DeleteIcon(); 3G0\i!*t
CDialog::OnCancel(); [8g\pPQ
} !~DkA7i 55
i*rv_G|(Zj
void CCaptureDlg::OnAbout() +( 7vmC.
{ *} 4;1OVT
CAboutDlg dlg; 8i
'jkyInT
dlg.DoModal(); CMf~Yv
} B'~i Z65
:z5Ibas:
void CCaptureDlg::OnBrowse() =:}DD0o*
{ 97
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CString str; 6B P%&RL
BROWSEINFO bi; 4>eg@s N
char name[MAX_PATH]; 8k}CR)3@C
ZeroMemory(&bi,sizeof(BROWSEINFO)); X~VZ61vNu
bi.hwndOwner=GetSafeHwnd(); >R !I
bi.pszDisplayName=name; :<G+)hIK
bi.lpszTitle="Select folder"; TgG)btQ
bi.ulFlags=BIF_RETURNONLYFSDIRS; ^O9m11
LPITEMIDLIST idl=SHBrowseForFolder(&bi); <}>-ip?
if(idl==NULL) -PuVI5L<
return; Ho{?m^
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); lt2&uYgp
str.ReleaseBuffer(); xg!\C@$
m_Path=str; VH*(>^OfF
if(str.GetAt(str.GetLength()-1)!='\\') 5 `mVe0uI
m_Path+="\\"; i;
uM!d}
UpdateData(FALSE); ;Awzm )Q
} ;{u#~d}
(
I~XwP&
void CCaptureDlg::SaveBmp() 8#3cmpx4
{ b8Ad*f\
CDC dc; `l@t3/
dc.CreateDC("DISPLAY",NULL,NULL,NULL); h.%Qn vL
CBitmap bm; vYun^(_-
int Width=GetSystemMetrics(SM_CXSCREEN); m#(x D~V
int Height=GetSystemMetrics(SM_CYSCREEN); D#(L@{vC
bm.CreateCompatibleBitmap(&dc,Width,Height); K_Gf\x
CDC tdc; @y%qQe/g
tdc.CreateCompatibleDC(&dc); Gs?sO?j
CBitmap*pOld=tdc.SelectObject(&bm); Xc<9[@
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Cf 8-%
tdc.SelectObject(pOld); J8[Xl.
BITMAP btm; dTNgrW`4
bm.GetBitmap(&btm); NWcF9z%@
DWORD size=btm.bmWidthBytes*btm.bmHeight; D'=`O6pK
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); JIkmtZv
BITMAPINFOHEADER bih; :zZM&r>
bih.biBitCount=btm.bmBitsPixel; z>q_]U0
bih.biClrImportant=0; gC:E38u
bih.biClrUsed=0; -Euy5Y
bih.biCompression=0; Msdwv.jM
bih.biHeight=btm.bmHeight; LD"}$vfs
bih.biPlanes=1; g[Y$SgJ
bih.biSize=sizeof(BITMAPINFOHEADER); !SNtJi$;v
bih.biSizeImage=size; 8XE0 p7
bih.biWidth=btm.bmWidth; $a]dxRkz
bih.biXPelsPerMeter=0; /FXfu
bih.biYPelsPerMeter=0; &Vm[5XW
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); =swcmab;
static int filecount=0; Lf<9GYNy>`
CString name; $t?e=#G
name.Format("pict%04d.bmp",filecount++); e1a %Rj~
name=m_Path+name; U%olH >1K
BITMAPFILEHEADER bfh; ?^0Z(<Arz
bfh.bfReserved1=bfh.bfReserved2=0; j|w+=A1
bfh.bfType=((WORD)('M'<< 8)|'B'); 27gm_*
bfh.bfSize=54+size; B) iJH
bfh.bfOffBits=54; -4a&R=%p
CFile bf; YRXe j
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ l#:Q V:
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Z/;SR""wa
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); O`| ri5d
bf.WriteHuge(lpData,size); s!\L1E
bf.Close(); m]vr|:{6/
nCount++; Sy~Mh]{E
} IT"jtV
GlobalFreePtr(lpData); EZFWxR/
if(nCount==1)
YDL)F<Y
m_Number.Format("%d picture captured.",nCount); Gj?q+-d!(5
else ]].21
m_Number.Format("%d pictures captured.",nCount); O2B$c\pw
UpdateData(FALSE); r3)t5P*_
} %dQX d]
w,$1 7+]3
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) @
vudeaup
{ [HfFC3U
if(pMsg -> message == WM_KEYDOWN) G)`MoVH1
{ #v<+G=r*O
if(pMsg -> wParam == VK_ESCAPE) <WmCH+>?r
return TRUE; )<&QcO_
if(pMsg -> wParam == VK_RETURN) ;U4X
U
return TRUE; Hs` '](
} HBu>BSv:
return CDialog::PreTranslateMessage(pMsg); YG|T;/-
} }Z=Qy;zk
pq`MO
.R
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Ks-><-2+N
{ 19DW~kvYk
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ .j.=|5nVo4
SaveBmp(); c eX*|B@=
return FALSE; BcWReyO<M
} >oNs_{
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ w5Z3e^g
CMenu pop; gsH_pG-jU
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); CaMG$X&O
CMenu*pMenu=pop.GetSubMenu(0); VP&lWPA}\$
pMenu->SetDefaultItem(ID_EXITICON); ShP V!$0
CPoint pt; `.XU|J*z,
GetCursorPos(&pt); Ab)7hCUW
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); xg&vZzcl
if(id==ID_EXITICON) P{ o/F
DeleteIcon(); +aap/sYp
else if(id==ID_EXIT) 5kz`_\&
OnCancel(); 4RNzh``u
return FALSE; }"v"^5
} >XN&QVE
LRESULT res= CDialog::WindowProc(message, wParam, lParam); j3U8@tuG
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) x$*OglaS
AddIcon(); aMWNZv
return res; P[~a'u
} MaM7u:kD#
a6C~!{'nW
void CCaptureDlg::AddIcon() BVDo5^&W
{ <T>f@Dn,
NOTIFYICONDATA data; WqO*vK!t
data.cbSize=sizeof(NOTIFYICONDATA); ^q$sCt}
CString tip; L\5n!(,0
tip.LoadString(IDS_ICONTIP); t!LvV.g+
data.hIcon=GetIcon(0); 2vLn#
data.hWnd=GetSafeHwnd(); #kA+Yqy\)
strcpy(data.szTip,tip); &M0v/!%L
data.uCallbackMessage=IDM_SHELL; ]MyWB<9M
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; [o6d]i!
data.uID=98; ~}fpe>M:
Shell_NotifyIcon(NIM_ADD,&data); q.4DwY5 L
ShowWindow(SW_HIDE);
b%6_LK[
bTray=TRUE; ,==lgM2V>
} <ZLs+|1
qmGB~N|N
void CCaptureDlg::DeleteIcon() x.I-z@\E
{ e BPMT
NOTIFYICONDATA data; "A7tb39*
data.cbSize=sizeof(NOTIFYICONDATA); A'T! og|5
data.hWnd=GetSafeHwnd(); <\u%ZB
data.uID=98; QQcJUOxT9
Shell_NotifyIcon(NIM_DELETE,&data); wSGUNP9
ShowWindow(SW_SHOW); mb/Y
SetForegroundWindow(); tfO
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ShowWindow(SW_SHOWNORMAL); 9ZwhCsO
bTray=FALSE; Ru/3>n
} i*3'O:Gq
a[!':-R`s
void CCaptureDlg::OnChange() YGB|6p(
{ %O-wMl
RegisterHotkey(); G7u7x?E:B`
} 0X;Dr-3<
xM(
BOOL CCaptureDlg::RegisterHotkey() G8@%)$A
{ F -m1GG0s
UpdateData(); e2>gQ p/
UCHAR mask=0; 6xwC1V?:0t
UCHAR key=0;
}0I ! n@
if(m_bControl) 5we1q7
mask|=4; q?wBh^
if(m_bAlt) ^(%>U!<<%,
mask|=2; .[7m4iJf
if(m_bShift) Kgcg:r:
mask|=1; `C3F?Lch
key=Key_Table[m_Key.GetCurSel()]; ~be&T:7.
if(bRegistered){ `#~@f!';
DeleteHotkey(GetSafeHwnd(),cKey,cMask); 7J)-WXk
bRegistered=FALSE; /}V9*mD2
} i^yQ;
2-
cMask=mask; ]0o78(/w2
cKey=key; T
^uBMDYe
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); *<KY^;
return bRegistered; Li}yK[\]
} nG2RBeJV
x\lua
四、小结 FBe1f1
sm
y<Z8+/f`f
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。