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:
VWshFI
;1.>"zX( 一、实现方法
%]ayW$4 ,z1!~gIal 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
,w%oSlOu i$ L]X[ #pragma data_seg("shareddata")
eUkoVr HHOOK hHook =NULL; //钩子句柄
j/9QV UINT nHookCount =0; //挂接的程序数目
KupMndK static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
p{a]pG+3 static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
Ys$YI{ static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
v1C.\fL static int KeyCount =0;
nr>{ uTa static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
@LKG\zYBu #pragma data_seg()
H\I!J@6g <8)s 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。
F36ViN\b yb{Q, Dz 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:
=$8@JF' [S]!+YBK BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
}IN_5o(( cKey,UCHAR cMask)
{TncqA {
5!ubY
6Ph BOOL bAdded=FALSE;
HJ qQlEq for(int index=0;index<MAX_KEY;index++){
z"K(
bw6 if(hCallWnd[index]==0){
q{GSsDo-:V hCallWnd[index]=hWnd;
p%"yBpSK HotKey[index]=cKey;
b;L>%; HotKeyMask[index]=cMask;
}E5#X R bAdded=TRUE;
)_v\{N KeyCount++;
)@qup _M@ break;
*e<Eu>fW#& }
fcICFReyV }
W3/ 7BW` return bAdded;
^ MT9n }
ChTXvkdH //删除热键
ch>Vv"G> BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
+SQjX7]% {
20VVOnDY BOOL bRemoved=FALSE;
Lq-33#n/ for(int index=0;index<MAX_KEY;index++){
oM<!I0"gC+ if(hCallWnd[index]==hWnd){
A*;?U2 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
cVay=5]. hCallWnd[index]=NULL;
o}=. HotKey[index]=0;
?Hi}nsw HotKeyMask[index]=0;
u:k:C bRemoved=TRUE;
Mjj}E
>& KeyCount--;
y-# break;
"XNu-_$N<a }
NaA+/: }
i~)NQmH< }
Px?Ao0)Z, return bRemoved;
A)zPaXZ }
ADGnBYE !\0F.* VD24X DLL中的钩子函数如下:
poD\C;o" d9Z&qdxTKq LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
_(6`{PWY {
90s;/y( BOOL bProcessed=FALSE;
"#twY|wW if(HC_ACTION==nCode)
Cqgk {
|rFR8srPG if((lParam&0xc0000000)==0xc0000000){// 有键松开
-2\ZzK0tM switch(wParam)
/zG+] {
gcg>Gjp case VK_MENU:
^Cg^`n?@b MaskBits&=~ALTBIT;
e3eVvl5] break;
ejklpa ./ case VK_CONTROL:
$(gGoL< MaskBits&=~CTRLBIT;
uuSR%KK]| break;
1OJ*wI* case VK_SHIFT:
8?7kIin MaskBits&=~SHIFTBIT;
3Q"F(uE v^ break;
a*Ss -y default: //judge the key and send message
RzS|dGNQE break;
YOV : }
st?gA"5w for(int index=0;index<MAX_KEY;index++){
dk_,YU'z if(hCallWnd[index]==NULL)
$;Vc@mYGW; continue;
i3Hz"Qs; if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
yI8m%g% {
a@#Q:O)4 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
py{eX`(MS bProcessed=TRUE;
x_==Ss }
)nwZ/&@ }
H&X:!xa5 }
AJyq>0p else if((lParam&0xc000ffff)==1){ //有键按下
F>dwL bnb switch(wParam)
:N@U[Wx0A {
%bP~wl~ case VK_MENU:
MZ|\S/ MaskBits|=ALTBIT;
Yb[n{.%/g break;
d/{Q
t case VK_CONTROL:
\=!H 2M MaskBits|=CTRLBIT;
5`{vE4A]q break;
p jKt:R} case VK_SHIFT:
mG)8U{L MaskBits|=SHIFTBIT;
M$Fth*q{GD break;
MO[kr2T default: //judge the key and send message
$!G` D= break;
9Ct_$.Q. }
Xb}!0k/{ for(int index=0;index<MAX_KEY;index++){
4xm&pQo{V6 if(hCallWnd[index]==NULL)
'>3`rsu continue;
x;]x_fz if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
&%^K,Q" {
6eQsoKK SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
]9jZndgC bProcessed=TRUE;
__!m*!sd }
Y@Y`gF6F }
$$JIBf8 }
ll^DY
hx} if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
4`nqAX~'f for(int index=0;index<MAX_KEY;index++){
?6i;)eIOI if(hCallWnd[index]==NULL)
L=,OZ9aA continue;
}Y Q:6I if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
&=6%> SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
mD7}t //lParam的意义可看MSDN中WM_KEYDOWN部分
*z0K%@M }
D(Qa>B"1 }
%3M95UZ2 }
TPHYz>D] return CallNextHookEx( hHook, nCode, wParam, lParam );
-!cIesK;< }
!!FR[NK Dl%?OG< 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:
9x=3W?K:, S'o ]=& BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
o{V#f_o BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
bM"fk& 2MuO*.9D 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:
d.`&0 HsnG4OE LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
\c{R <Hh {
BCx!0v?9 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
`<^*jB@P {
u_.HPA //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
6xarYh( SaveBmp();
iJ)0Y~ return FALSE;
&<Mt=(qY1 }
#{x5L^v>] …… //其它处理及默认处理
@l~7x }
%M9;I zPVd(V~(T >AG^fUArH 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。
LeSHRoD 1Bg_FPu 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。
y"vX~LR P-'_}*wxi 二、编程步骤
"cMNdR1^,y xuUx4,Z 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";
S[mM4et| vZ@g@zB4o0 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
q#NR32byF aG!
*WHt 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;
mc
ZGg;3 D{p5/#|r 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;
e1unzpWN \ZSTKi? 5、 添加代码,编译运行程序。
R\5Vq$Q "Sjr_!u 三、程序代码
Jx$iwu .x}gg\ ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
+K^h!d] #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
,r=re!QI7 #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
tz4
]hF #if _MSC_VER > 1000
+TN^NE #pragma once
~c*
UAowS #endif // _MSC_VER > 1000
bLbR IY"l #ifndef __AFXWIN_H__
6tn+m54_ #error include 'stdafx.h' before including this file for PCH
t`5j4bdG #endif
vXdZmYrC #include "resource.h" // main symbols
A59gIp*> class CHookApp : public CWinApp
9t K>gwb {
/r^[a,Q#x public:
dl0FQNz8@B CHookApp();
8o|P&q(v* // Overrides
,Ff n)+ // ClassWizard generated virtual function overrides
gn ?YF` //{{AFX_VIRTUAL(CHookApp)
~Ky4+\6o> public:
uZIJoT virtual BOOL InitInstance();
_BS
9GB virtual int ExitInstance();
7,'kpyCj //}}AFX_VIRTUAL
{%b
}Z2
//{{AFX_MSG(CHookApp)
Jdj?I'XtY // NOTE - the ClassWizard will add and remove member functions here.
|~K(F<;j // DO NOT EDIT what you see in these blocks of generated code !
oM,- VUr //}}AFX_MSG
2z_2.0/3 DECLARE_MESSAGE_MAP()
5~+XZA#2 };
cin2>3Z$ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
WUEHB BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
\Q&,ISO\ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
%8mm Hh BOOL InitHotkey();
VWi2(@R^ BOOL UnInit();
!tNd\}@ #endif
T3N"CUk ONX8}Ob~ //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
>7b)y #include "stdafx.h"
ZFvyL8o #include "hook.h"
mR+Jws' #include <windowsx.h>
9+qOP>m #ifdef _DEBUG
>jx.R #define new DEBUG_NEW
gR Nv-^ #undef THIS_FILE
8SC%O\, static char THIS_FILE[] = __FILE__;
" aq'R(/`c #endif
Dl C@fZD #define MAX_KEY 100
".U^ifF #define CTRLBIT 0x04
B4g8
~f #define ALTBIT 0x02
Br5o7(AE #define SHIFTBIT 0x01
,^$|R32 #pragma data_seg("shareddata")
(\,BxvhG= HHOOK hHook =NULL;
osHCg UINT nHookCount =0;
9}P"^N static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
^6;V}2>v} static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
3l4NC03I& static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
@T:faJ5\' static int KeyCount =0;
B_^]C9C| static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
x,8<tSW)Z #pragma data_seg()
#=,imsW) HINSTANCE hins;
p_2pU)% void VerifyWindow();
u\1>gDI )| BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
H !)=y //{{AFX_MSG_MAP(CHookApp)
<
<Y}~N // NOTE - the ClassWizard will add and remove mapping macros here.
+K~NV?c // DO NOT EDIT what you see in these blocks of generated code!
Ev9> @~^ //}}AFX_MSG_MAP
}-DE`c END_MESSAGE_MAP()
izZ=d5+K D'_Bz8H!p CHookApp::CHookApp()
h|;qG)f^ {
C~4PE>YtTv // TODO: add construction code here,
%.HJK // Place all significant initialization in InitInstance
pz|'l:v^ }
E JK0 #8h;Bj CHookApp theApp;
p(JlvJjo LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
c EnkU] {
<a^Oj LLU BOOL bProcessed=FALSE;
BR5BJX if(HC_ACTION==nCode)
LT@OWH {
x/fX`y|(}* if((lParam&0xc0000000)==0xc0000000){// Key up
;_?MX/w|& switch(wParam)
K^[#]+nQ {
{+.r5py case VK_MENU:
Ao9R:|9 MaskBits&=~ALTBIT;
DcD{*t?x break;
%O[N}_XHEh case VK_CONTROL:
JXqr3Np1 MaskBits&=~CTRLBIT;
l$xxrb9P! break;
GqKsK
r2% case VK_SHIFT:
zaimGMJ , MaskBits&=~SHIFTBIT;
B 0ee?VC break;
Wp0
Dq( default: //judge the key and send message
]wVk+%e break;
YT#3n }
]lO h&Cz[ for(int index=0;index<MAX_KEY;index++){
s5&@Cxzl if(hCallWnd[index]==NULL)
`~BZ1)@ continue;
tY|8s]{2 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
~x:DXEV, {
w.{&=WTr SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
m#!=3P7T bProcessed=TRUE;
YB( Gk;] }
|N /G'>TS }
BU Z
_) }
K=::)/{P else if((lParam&0xc000ffff)==1){ //Key down
U(>4s]O6 switch(wParam)
,:Z^$ {
&53]sFZ
case VK_MENU:
3VO2,PCZ MaskBits|=ALTBIT;
G6 0S|d break;
0%Ll case VK_CONTROL:
fxcc<h4 MaskBits|=CTRLBIT;
yay<GP? break;
r=uN9ro case VK_SHIFT:
o{qr!*_3 MaskBits|=SHIFTBIT;
X2sH E break;
n/d`qS default: //judge the key and send message
?%tMohL break;
2B0W~x2= }
Sl2iz? for(int index=0;index<MAX_KEY;index++)
-fI`3# {
7cDU2l if(hCallWnd[index]==NULL)
{Azn&|%.t continue;
9pn>-1NJ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
BaI $S>/Q {
$ ,Ck70_ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
mEG6 bProcessed=TRUE;
^2D1`,|N }
"ww|&-W9 }
K)tQ]P }
"p&Y^] if(!bProcessed){
uA tV". for(int index=0;index<MAX_KEY;index++){
d[^KL;b?6 if(hCallWnd[index]==NULL)
z4%uN|V continue;
C$h<Wt=< if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
C*=Xk/0 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
Qd _6)M- }
CvSIV7zYo }
!^#jwRpeN }
>^Q&nkB"B return CallNextHookEx( hHook, nCode, wParam, lParam );
PX:'/{V }
QfM zF (_kp{0r# BOOL InitHotkey()
g,tjm( {
Pt:e!qX) if(hHook!=NULL){
M-L2w" nHookCount++;
-H^oXeN return TRUE;
mYN7kYR}<` }
<#=N
m0S$ else
e1(Q(3 hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
f),TO if(hHook!=NULL)
Ei}/iBG@ nHookCount++;
|:[tNs*,O return (hHook!=NULL);
+CH},@j }
g6@Fp7T BOOL UnInit()
c .3ZXqpI; {
,u }XWV if(nHookCount>1){
oBQ#eW aY nHookCount--;
p^<yj0Y return TRUE;
fqX"Lus `= }
y.5/?{GL BOOL unhooked = UnhookWindowsHookEx(hHook);
00I}o%akO if(unhooked==TRUE){
Ars687WB nHookCount=0;
E1dD7r\ hHook=NULL;
n~"$^Vr }
<?-YTY| return unhooked;
w{[=l6L m }
f0<hE2 2]GdD* BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
1_fZm+oW! {
;{i'#rn{ BOOL bAdded=FALSE;
0nn okN^ for(int index=0;index<MAX_KEY;index++){
mpAR7AG6 if(hCallWnd[index]==0){
W>r#RXmh hCallWnd[index]=hWnd;
?]fF3 SJk HotKey[index]=cKey;
2XTPBZNe HotKeyMask[index]=cMask;
bmN q[} bAdded=TRUE;
7{e{9QbJ4 KeyCount++;
3!Sp0P break;
:q8b;*: }
iHwLZ[O{ }
UNijFGi return bAdded;
=PRx?q`d }
S)QAXjH /,!qFt BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
pi=-#g(2 {
R1nJUOE4w^ BOOL bRemoved=FALSE;
]{"Br$ for(int index=0;index<MAX_KEY;index++){
LmlXMia if(hCallWnd[index]==hWnd){
}kw/W#)J if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
A(?\>X
9g hCallWnd[index]=NULL;
{o5V7*P;_ HotKey[index]=0;
hjaT^(Y HotKeyMask[index]=0;
.s#;s'>g bRemoved=TRUE;
1h6^>()^ KeyCount--;
>fH=DOz$& break;
D:k3"
E"S }
`D9]*c
!mO }
:4~g;2oag }
<;E return bRemoved;
`_b`kzJ }
hN['7:bQ 3qY K_M^[ void VerifyWindow()
V"p!Bf {
1;Pv0&[q/ for(int i=0;i<MAX_KEY;i++){
>zDF2Y[ if(hCallWnd
!=NULL){ h;=6VgXZ
if(!IsWindow(hCallWnd)){ : ^ 8
hCallWnd=NULL; (`SRJ$~f
HotKey=0; q o<&J f
HotKeyMask=0; *x)Ozfe
KeyCount--; UzXE_S
} &/Ro lIHF
} 2X:4CC%5
} t){"Tfc:
} -(O-%
83;NIE;
BOOL CHookApp::InitInstance() }FzqW*4~
{ WL` 9~S
AFX_MANAGE_STATE(AfxGetStaticModuleState()); \*,=S52
hins=AfxGetInstanceHandle(); p>_;^&>&
InitHotkey(); Vy_2 .
return CWinApp::InitInstance(); JG9` h#
} VmzbZTup
:4^\3~i1X
int CHookApp::ExitInstance() P2nft2/eu?
{ 2e$w?W0^
VerifyWindow(); P"<U6zM\sP
UnInit(); M$0u1~K
return CWinApp::ExitInstance(); -s 6![eV
} aR\\<due
L`th7d"
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file J9K3s_SN
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ^(*n]
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ oI^4pwn h
#if _MSC_VER > 1000 VCtH%v#S;.
#pragma once PjN =k;
#endif // _MSC_VER > 1000 +7t6k7]c
7}*6#KRG
class CCaptureDlg : public CDialog :ss,Hl
{ 54rkC/B>
// Construction C>[Uvc
public: _|"Y]:j_
BOOL bTray; -l%J/ :
BOOL bRegistered; |+`c3*PV
BOOL RegisterHotkey(); ID.n1i3
UCHAR cKey; .S(,o.
UCHAR cMask; ~+Z{Q25R
void DeleteIcon(); 1heS*Fwn'
void AddIcon(); "B_K
XL
UINT nCount; cUDoN`fSl,
void SaveBmp(); V/LQ<Yke
CCaptureDlg(CWnd* pParent = NULL); // standard constructor xoOJauSX1
// Dialog Data
-Ij&
//{{AFX_DATA(CCaptureDlg) rHP%0f9:
enum { IDD = IDD_CAPTURE_DIALOG }; &-5_f*{
CComboBox m_Key; _-5,zPR
BOOL m_bControl; rp5(pV7*
BOOL m_bAlt;
BUwONF
BOOL m_bShift; RxMH!^
CString m_Path; ORu2V#Z[
CString m_Number; -{`@=U
//}}AFX_DATA |Yq$sU
// ClassWizard generated virtual function overrides c{[q>@y
pK
//{{AFX_VIRTUAL(CCaptureDlg) A>{p2?`+!
public: o!4!"O'E
virtual BOOL PreTranslateMessage(MSG* pMsg); lY*[tmz)
protected:
&YDK (&>
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support JsO
*1{6g
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); "bDs2E+W
//}}AFX_VIRTUAL d~h:~
// Implementation >a3p >2
protected: V5 U?F6
HICON m_hIcon; %%cHoprDa
// Generated message map functions ={hX}"*D
//{{AFX_MSG(CCaptureDlg) JoSJH35=:
virtual BOOL OnInitDialog(); OLI$1d_
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ,RN:^5 p
afx_msg void OnPaint(); "QvmqI>
afx_msg HCURSOR OnQueryDragIcon(); >AJSqgHQ,
virtual void OnCancel(); S~]mWxgZ
afx_msg void OnAbout(); WW~+?g5
afx_msg void OnBrowse(); G|\^{5
afx_msg void OnChange(); =V"(AuCVE
//}}AFX_MSG t'm;:J1
DECLARE_MESSAGE_MAP() Gn;@{x6
}; &CwFdx:Ff
#endif jq08=
mqq;H}
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file Qv-@Zt!8
#include "stdafx.h" 97)/"i e
#include "Capture.h" :W@#) 1=
#include "CaptureDlg.h" Kt0(gQOr0
#include <windowsx.h> ?'"X"@r5
#pragma comment(lib,"hook.lib") 9;xM%
#ifdef _DEBUG y,pZTlE
#define new DEBUG_NEW N?X~ w <
#undef THIS_FILE |pa$*/!NT
static char THIS_FILE[] = __FILE__; uytE^
#endif @(C1_
#define IDM_SHELL WM_USER+1 GElvz'S~
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); W5#611
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); I7^zU3]Ul
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Hi]cxD*`
class CAboutDlg : public CDialog mw5?[@G-
{ WL{(Ob
public: h_d<!
CAboutDlg(); CkswJ:z)sc
// Dialog Data j1 =`|
//{{AFX_DATA(CAboutDlg) cwV]!=RtO
enum { IDD = IDD_ABOUTBOX }; 5[n(7;+gw
//}}AFX_DATA gl&5l1&
// ClassWizard generated virtual function overrides r <
cVp^
//{{AFX_VIRTUAL(CAboutDlg) 3Tq\BZ
protected: ^9-&o
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support X>?b#Eva
//}}AFX_VIRTUAL n&A'C\
// Implementation ^T~gEv
protected: q64k7<C,
//{{AFX_MSG(CAboutDlg) 16SOIT
//}}AFX_MSG /s];{m|>
DECLARE_MESSAGE_MAP() >&!RWH9*q
}; vy,&N^P
Bvt@X
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ;60.l!
{ R/`q/0T.
//{{AFX_DATA_INIT(CAboutDlg) Y
wkyq>Rv
//}}AFX_DATA_INIT M# 18H<]
} .@-$5Jw
qaim6a
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 21RP=0Q:
{ ` ]Ppau
CDialog::DoDataExchange(pDX); 0P>OJYFr'
//{{AFX_DATA_MAP(CAboutDlg) +y 87~]]
//}}AFX_DATA_MAP Vb
qto|X@
} h$N0D !
w-@6|o,S
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) sE{ pzPq!
//{{AFX_MSG_MAP(CAboutDlg) kM`l
// No message handlers g,:j/vR
//}}AFX_MSG_MAP M/Pme&%
END_MESSAGE_MAP() "n:{!1VGw
6oSQQhge
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) c%*($)#
: CDialog(CCaptureDlg::IDD, pParent) l^J75$7
{ OGiV{9U
//{{AFX_DATA_INIT(CCaptureDlg) 8P:
Rg%0)
m_bControl = FALSE; %P;Q|v6/|
m_bAlt = FALSE;
Quf_'
m_bShift = FALSE; )bx_;9Y{
m_Path = _T("c:\\"); RllY-JBO
m_Number = _T("0 picture captured."); ;WL1B
nCount=0; W(RF n`g\
bRegistered=FALSE; Xtq{%
bTray=FALSE; ?X?&~3iD%
//}}AFX_DATA_INIT (6v(9p
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 c"!lwm3b
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 09o~9z0
} }IEbyb
G;3~2^lB\
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) zY+Fl~$S
{ >+5?F*`\D*
CDialog::DoDataExchange(pDX); ;V<iL?
//{{AFX_DATA_MAP(CCaptureDlg) ~el3I=KC}
DDX_Control(pDX, IDC_KEY, m_Key); Jw~( G9G
DDX_Check(pDX, IDC_CONTROL, m_bControl); ``ekR6[ 8c
DDX_Check(pDX, IDC_ALT, m_bAlt); [#YE^[*qK
DDX_Check(pDX, IDC_SHIFT, m_bShift); ^w~23g.
DDX_Text(pDX, IDC_PATH, m_Path); qz4^{
DDX_Text(pDX, IDC_NUMBER, m_Number); CXtU"X
//}}AFX_DATA_MAP S]sk7
} %7`f{|.
}6 5s'JB
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 63?)K s
//{{AFX_MSG_MAP(CCaptureDlg) :Sg_tOf
ON_WM_SYSCOMMAND() p
(FlR?= S
ON_WM_PAINT() (wmBjQ]B<
ON_WM_QUERYDRAGICON()
wiX ~D
ON_BN_CLICKED(ID_ABOUT, OnAbout) 9{j66
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) c.\O/N
ON_BN_CLICKED(ID_CHANGE, OnChange) 9t@:4O
//}}AFX_MSG_MAP i~J;G#b
END_MESSAGE_MAP() YGc^h(d
?t@v&s
BOOL CCaptureDlg::OnInitDialog() h;lirvO|
{ *b}>cn)<v
CDialog::OnInitDialog(); (yo;NKq,@
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); <ktzT&A
ASSERT(IDM_ABOUTBOX < 0xF000); )x#5Il
H
CMenu* pSysMenu = GetSystemMenu(FALSE); ]<DNo&fw
if (pSysMenu != NULL) Pag63njg?
{ a'\By?V]
CString strAboutMenu; ')S;[= v
strAboutMenu.LoadString(IDS_ABOUTBOX); vhr+g 'tf
if (!strAboutMenu.IsEmpty()) 6{d6s#|%
{ U-wLt(Y<
pSysMenu->AppendMenu(MF_SEPARATOR); t)oa pIeIe
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); "x'),
} B@Nt`ky0*
} h?\2_s
SetIcon(m_hIcon, TRUE); // Set big icon S~$'WA
SetIcon(m_hIcon, FALSE); // Set small icon :PbDU$x
m_Key.SetCurSel(0); Vv$HR
RegisterHotkey(); 0%s|Zbo!>
CMenu* pMenu=GetSystemMenu(FALSE); nRhrWS
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); q^rl)
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); k&hc m
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 2Ha5yaTL
return TRUE; // return TRUE unless you set the focus to a control +)nT|w45
} iV.p5FD
.'[/|4H
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ,G^[o,hS
{
>95TvJ
if ((nID & 0xFFF0) == IDM_ABOUTBOX) Hg}I]!B
{ {mE! Vf
CAboutDlg dlgAbout; p<WFqLe(":
dlgAbout.DoModal(); 7=4 A;Ybq
} VVWM9x
else RaSz>-3d
{ e2$]g>
CDialog::OnSysCommand(nID, lParam); .V6-(d
} gM;}#>6
} XM
Vq-8B0
[AEBF2OIv
void CCaptureDlg::OnPaint() TY;U2.Ud
{ BdbJ< Is
if (IsIconic()) !a1i Un9
{ VS?@y/\In
CPaintDC dc(this); // device context for painting `29TY&p+"
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); '!vc/Hw
// Center icon in client rectangle LU!1s@
int cxIcon = GetSystemMetrics(SM_CXICON); -'rj&x{Q)U
int cyIcon = GetSystemMetrics(SM_CYICON); ")s!L"x
CRect rect; d_}a`H
GetClientRect(&rect); |c-LSs'\
int x = (rect.Width() - cxIcon + 1) / 2; Oi:JiD=
int y = (rect.Height() - cyIcon + 1) / 2; cTZ)"^z!
// Draw the icon b'>8ZIY
dc.DrawIcon(x, y, m_hIcon); ;i#LIHJ
} %IpSK 0<Sp
else <2
{ ?BCy J
CDialog::OnPaint(); MBk"KF
} ;'RFo?u K
} }F`beoMAkM
<l\N|+7R
HCURSOR CCaptureDlg::OnQueryDragIcon() [UPNd!sy
{ X=qS"O 1
return (HCURSOR) m_hIcon; P`s(kIe
} Ri:p8
DOD6Liau{Q
void CCaptureDlg::OnCancel() =.m6FRsU
{ <z#BsnjW{
if(bTray) Zcd7*EBdx
DeleteIcon(); twqFs
CDialog::OnCancel(); 2?i\@r@E|
} CKARg8o
G=M] 8+h
void CCaptureDlg::OnAbout() !awh*Xj6
{ Oo%!>!Lt,
CAboutDlg dlg; % mn />
dlg.DoModal(); _^uc 0=
} l^ 4OC
&R]pw`mTH
void CCaptureDlg::OnBrowse() f[/.I,9U^
{ hd^x}iK"
CString str; G_oX5:J*
BROWSEINFO bi; $fArk36O#
char name[MAX_PATH]; GXb47_b^
ZeroMemory(&bi,sizeof(BROWSEINFO)); `ypL]$cW
bi.hwndOwner=GetSafeHwnd(); Md(JIlh3
bi.pszDisplayName=name; q&M:17+:Q
bi.lpszTitle="Select folder"; 2tr
:xi@
bi.ulFlags=BIF_RETURNONLYFSDIRS; 9\51Z:>
LPITEMIDLIST idl=SHBrowseForFolder(&bi); J6|JWp
if(idl==NULL) C@@$"}%v2
return; hN4VlNKu
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); &zN@5m$k;
str.ReleaseBuffer(); `!c,y~r[
m_Path=str; .K9l*-e[=
if(str.GetAt(str.GetLength()-1)!='\\') cqQRU
m_Path+="\\"; GfsBQY/
UpdateData(FALSE); n! .2aq
} <Ry$7t,
u7k|7e=xk
void CCaptureDlg::SaveBmp() G:+16XCra
{ 7~.ZE
CDC dc; {;RF
dc.CreateDC("DISPLAY",NULL,NULL,NULL); ^tE_LL+ji|
CBitmap bm; ]t/f<jKN^
int Width=GetSystemMetrics(SM_CXSCREEN); :::>ro*R
int Height=GetSystemMetrics(SM_CYSCREEN); 5-p.MGso
bm.CreateCompatibleBitmap(&dc,Width,Height); CX+9R3pa
CDC tdc; }K8Lm-.=
tdc.CreateCompatibleDC(&dc); 7z<Cu<
CBitmap*pOld=tdc.SelectObject(&bm); {'IFWD. 5
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Yn1?#%%
tdc.SelectObject(pOld); VN|G5*
BITMAP btm; Pf8u/?/
bm.GetBitmap(&btm); fNxw&ke8&
DWORD size=btm.bmWidthBytes*btm.bmHeight; :HZ;Po
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); _'c+fG
\
BITMAPINFOHEADER bih; %8Yyj{^!(
bih.biBitCount=btm.bmBitsPixel; _W9&J&l0so
bih.biClrImportant=0; rbh[j@s@
bih.biClrUsed=0; zUQe0Gc.b^
bih.biCompression=0; ]C)|+`XE@
bih.biHeight=btm.bmHeight; A[9NP-~
bih.biPlanes=1; a;&}zcc*
bih.biSize=sizeof(BITMAPINFOHEADER); vXubY@k2
bih.biSizeImage=size; 1l]C5P}E
bih.biWidth=btm.bmWidth; A9n41,h
bih.biXPelsPerMeter=0; 4Iq5+Q
bih.biYPelsPerMeter=0; VG\mo?G
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); "
Z;uu)NE
static int filecount=0; " dT>KQ
CString name; !Zj#.6c9
name.Format("pict%04d.bmp",filecount++); 5DSuUEvWcL
name=m_Path+name; cj^bh
BITMAPFILEHEADER bfh; &|z|SY]DL
bfh.bfReserved1=bfh.bfReserved2=0; _?Ckq
bfh.bfType=((WORD)('M'<< 8)|'B'); HXP;0B%4
bfh.bfSize=54+size; c! ~T2t
bfh.bfOffBits=54; e?vj+ZlS$f
CFile bf; i puo}
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ WY.5K
=}
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); U3VT*nj'
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); S>EDL
bf.WriteHuge(lpData,size); E!dp~RwZu
bf.Close(); ;Xh5oB\)W
nCount++; [0(mFMC`
} cyb(\ fsC
GlobalFreePtr(lpData); \>;%Ji
if(nCount==1) j]4,6`b\
m_Number.Format("%d picture captured.",nCount); S~|tfJpL
else D2?S,9+E_
m_Number.Format("%d pictures captured.",nCount); iPkT*Cl8
UpdateData(FALSE); qzlER
} bZXlJa`'S
. =R=cA7
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 5*XH6g F
{ HqRCjD
if(pMsg -> message == WM_KEYDOWN) IdmD.k0pJ
{ }+JLn%H)
if(pMsg -> wParam == VK_ESCAPE) hG~ Uz
return TRUE; (-'PD_|
if(pMsg -> wParam == VK_RETURN) /xf.\Z7<
return TRUE; wNR=?Z~
} /gX%ABmS
return CDialog::PreTranslateMessage(pMsg); ebD{ pc`&
} %\l0-RA@<
&&*wmnWCS{
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) [[$Mh_MD
{ Y)v%
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Hq-v@@0 *
SaveBmp(); i2U/RXu
return FALSE; E]?2!)mgce
} `{WCrw6)
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 1V\1]J/
CMenu pop; YOlH*cZtg
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); {~"Em'}J
CMenu*pMenu=pop.GetSubMenu(0); YiO3<}Uf
pMenu->SetDefaultItem(ID_EXITICON); U#$:\fT
CPoint pt; P8u"T!G
GetCursorPos(&pt); ?qIGQ/af&
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ^:U;rHY
if(id==ID_EXITICON) g.=!3e&z%
DeleteIcon(); 6iyt2qkh
else if(id==ID_EXIT)
Jb6&
OnCancel(); qWkx:-g]
return FALSE; Mi;Tn;3er
} :g/{(#E@Z
LRESULT res= CDialog::WindowProc(message, wParam, lParam); {YfYIt=.
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 2t.fD@
AddIcon();
TiTYs
return res; 5%#i79z&B
} +
p'\(Z(
@}Pw0vC
void CCaptureDlg::AddIcon() s?HsUD$b
{ 7~L|;^(
NOTIFYICONDATA data; %va[jJ
data.cbSize=sizeof(NOTIFYICONDATA); U<|B7t4M
CString tip; "hfw9Qm
tip.LoadString(IDS_ICONTIP); :
qr}M
data.hIcon=GetIcon(0); Km%8Yw0+
data.hWnd=GetSafeHwnd(); z{AM2Z
strcpy(data.szTip,tip); "^!j5fZ
data.uCallbackMessage=IDM_SHELL; % ghJ*iHR
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; J511AoQ{R
data.uID=98; x[Hhj'
Shell_NotifyIcon(NIM_ADD,&data); miWw6!()
ShowWindow(SW_HIDE); f)qPFM]%z
bTray=TRUE; @i\7k(9:A
} P%ye$SASd
w:n(pLc<
void CCaptureDlg::DeleteIcon() Un~]Q?w
{ ;%M2x5
NOTIFYICONDATA data; K T%i,T
data.cbSize=sizeof(NOTIFYICONDATA); x!Y( Y=i>
data.hWnd=GetSafeHwnd(); #V,LNX)
data.uID=98; 9{T 8M
Shell_NotifyIcon(NIM_DELETE,&data); .`b4h"g:
ShowWindow(SW_SHOW); rGGS]^
SetForegroundWindow(); @^BS#
ShowWindow(SW_SHOWNORMAL); 2J1B$.3'
bTray=FALSE; 5^bh.uF
} 3KB|NS
V,`!rJ
void CCaptureDlg::OnChange() ~D$#>'C#
{ ZE{aS4c
RegisterHotkey(); dVij <! Lu
} r{bgTG
?L`MFR
BOOL CCaptureDlg::RegisterHotkey() jo]m12ps
{ )j$b9ZBk
UpdateData(); p|xs|O6{
UCHAR mask=0; wV7@D[8
UCHAR key=0; >B @i
E
if(m_bControl) R994R@gz
mask|=4;
MYKs??]Y1
if(m_bAlt) +qE,<c}}
mask|=2; p`shYyE
if(m_bShift) n U+pnkMj
mask|=1; &h98.A*&
key=Key_Table[m_Key.GetCurSel()]; MH C.k=
if(bRegistered){ oUnq"]
DeleteHotkey(GetSafeHwnd(),cKey,cMask); L{4),65
bRegistered=FALSE; 3U :YA&K(
} cg>!<T*
cMask=mask; k8!hvJ)?
cKey=key; UUt~W
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ZJiuj!
return bRegistered; <L[T'ZE+
} yBUZVqqDa
r@N39O*Wq
四、小结 v4nvZ6
0(Yh~{
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。