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:
[+*$\ ; R=.iOn 一、实现方法
BG^C9*ZuP R.[Z]-X 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
_{vkX<s :M{Y,~cP #pragma data_seg("shareddata")
qzw'zV HHOOK hHook =NULL; //钩子句柄
iGDLZE+? UINT nHookCount =0; //挂接的程序数目
c H-@V< static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
]{
BEr* static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
0,s$T2 static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
;VO.!5W@eg static int KeyCount =0;
aKUS5jDu static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
;?}l #pragma data_seg()
XS0xLt= )4?x5# 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。
Ed0I WPx 9jp:k><\(c 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:
@\oz4^ v]%WH~> BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
dLsn\m> cKey,UCHAR cMask)
xCzebG[" {
b96%") BOOL bAdded=FALSE;
B()/.w?A for(int index=0;index<MAX_KEY;index++){
fW`&'! if(hCallWnd[index]==0){
1Kvx1p
hCallWnd[index]=hWnd;
i`/+,< HotKey[index]=cKey;
xt'tL:d HotKeyMask[index]=cMask;
.,~(%#Wl$ bAdded=TRUE;
A`}yBSb KeyCount++;
3Y)PU= break;
S0g'r
!;6 }
aw?=hXR! }
=z{JgD/ return bAdded;
+5.t. d }
:0K8h //删除热键
E|YdcS BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
bsxTqJ {
#>Y'sd5'A BOOL bRemoved=FALSE;
)5%C3/Dl! for(int index=0;index<MAX_KEY;index++){
6*l^1;U if(hCallWnd[index]==hWnd){
4`Nt{ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
vvB(r! hCallWnd[index]=NULL;
-16K7yk HotKey[index]=0;
/sR%]q
|L HotKeyMask[index]=0;
j`
E +qk bRemoved=TRUE;
O=) KeyCount--;
H$ftGwS8 break;
qj01] }
'`Bm'Dd }
ky>wOaTmN6 }
NVIK>cT6 return bRemoved;
o ]Jv;Iy@? }
4>^K:/y r4x3$M c \^1+U JU DLL中的钩子函数如下:
&`Y!;@K9W# xX0-]Y h: LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
PqNFyQkl {
H7+Xs% BOOL bProcessed=FALSE;
E^_wI> if(HC_ACTION==nCode)
iFSJL,QZ3 {
D2YZ9e
if((lParam&0xc0000000)==0xc0000000){// 有键松开
@
P@c.*}s switch(wParam)
%puLr'Y {
DlMe5=n-u case VK_MENU:
#X:
'aj98 MaskBits&=~ALTBIT;
@4%L36k break;
ULc`~] case VK_CONTROL:
J68j=`Y MaskBits&=~CTRLBIT;
I"AYWo? break;
Ub0/r$]DK case VK_SHIFT:
D7]#Xk2 MaskBits&=~SHIFTBIT;
l?Y_~Wuw break;
^^i6|l1 default: //judge the key and send message
d;Hn#2C break;
syx\gz }
G.+l7bnZM for(int index=0;index<MAX_KEY;index++){
9 7%0;a8 if(hCallWnd[index]==NULL)
JB</euyV continue;
BY\:dx)mK if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
oRN-xng {
%CZ-r"A SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
,3v+PIcMM+ bProcessed=TRUE;
s#h8%[' }
ka\OJ7u }
s57N) 0kP }
sGY_{CZ: else if((lParam&0xc000ffff)==1){ //有键按下
k>}g\a, switch(wParam)
rA0,`}8\ {
N-lGa@ j case VK_MENU:
NRnRMY- MaskBits|=ALTBIT;
0U66y6 break;
)PkNWj6%y case VK_CONTROL:
-B#yy]8 MaskBits|=CTRLBIT;
g]* break;
eRbGZYrJ case VK_SHIFT:
^n#1<K[E MaskBits|=SHIFTBIT;
]!:oYAm break;
qo+N,x9o default: //judge the key and send message
&m3.h!dq break;
;TQf5|R\K }
qZ@0]"h for(int index=0;index<MAX_KEY;index++){
zWw2V}U! if(hCallWnd[index]==NULL)
BhpOXqg continue;
@/J[t if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
`&M{cfp_ {
2Zuq?1= SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
,O1O8TwUB0 bProcessed=TRUE;
r%wA&FQ8U }
^IZ)#1U }
6
y"-I!& }
LL!.c if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
g}&hl"j for(int index=0;index<MAX_KEY;index++){
k.h`Cji@ if(hCallWnd[index]==NULL)
Z>F^C}8f continue;
C7T(+Wd!, if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
@J[6,$UVu SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
:Ud[f`t //lParam的意义可看MSDN中WM_KEYDOWN部分
YF#HSf7 }
F0~k1TDw }
l>lW]W }
]!1OH
|Ad return CallNextHookEx( hHook, nCode, wParam, lParam );
?wMHS4 }
K*K1(_x= 5_K5?N 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:
F}Mhs17!| Jsg
I' BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
;S$Ll*f>D BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
:/YO ni1h JnD{J`: 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
&a> lWE y$Zj?Dd# LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
>1L=,M {
PZ:u_*Vu` if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
O|kKwadC {
Q^}%c
U0 //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
71FeDpe SaveBmp();
\a"Ct' return FALSE;
G"
b60RQ }
BOlAm*tFt …… //其它处理及默认处理
lw8"'0 }
x9>\(-uU VCNT4m pvWau1ArNq 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。
<Pqv;WI|R `znB7VQ0 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。
?9j{V7h
&'|B =7 二、编程步骤
h4&;?T S ;'T{li2 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";
v|Jlf$> hSqY$P 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
&Y|Xd4: x!S;SU 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;
Ftb%{[0}u3 L/}iy} 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;
xIbMs4'iEx k@!r#`j3 5、 添加代码,编译运行程序。
4YG/`P x
FJg 三、程序代码
F
SMj KM?1/KZ/~ ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
9G?ldp8 #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
V+MK'<#B #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
t
*6loS0+ #if _MSC_VER > 1000
"vF
MSY #pragma once
=?}twC$ #endif // _MSC_VER > 1000
ux2013C_ #ifndef __AFXWIN_H__
?4t-caK^u #error include 'stdafx.h' before including this file for PCH
1V&PtI3!! #endif
U0B2WmT~Q #include "resource.h" // main symbols
GrJ#. class CHookApp : public CWinApp
UgHf*m {
cleOsj;S public:
.,2V5D-${ CHookApp();
?v]-^X=& // Overrides
rp!
LP#* // ClassWizard generated virtual function overrides
E,G<_40 //{{AFX_VIRTUAL(CHookApp)
;#?M)o:q public:
ucYkxi`x virtual BOOL InitInstance();
Ry;$^.7% virtual int ExitInstance();
Q ~|R Z7G //}}AFX_VIRTUAL
O_@2;iD^^ //{{AFX_MSG(CHookApp)
T(X:Yw // NOTE - the ClassWizard will add and remove member functions here.
-mNQ;zI1 // DO NOT EDIT what you see in these blocks of generated code !
IY(h~O //}}AFX_MSG
dT@UK^\ DECLARE_MESSAGE_MAP()
4z4v\IpB };
o.:p_(|hI LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
S4vbN BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
85U.wpG BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
O??vm?eo BOOL InitHotkey();
'E]A.3-Mt BOOL UnInit();
Ng<1Sd|MV #endif
:{g7lTM g#^|oYuH6 //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
9V!-ZG #include "stdafx.h"
`_AM` >_ #include "hook.h"
0LVE@qEL #include <windowsx.h>
0A$SYF$O+[ #ifdef _DEBUG
oN2=DYC41 #define new DEBUG_NEW
,\ldz(D?+ #undef THIS_FILE
CDg AGy static char THIS_FILE[] = __FILE__;
SBKeb|H8 #endif
rnhFqNT: #define MAX_KEY 100
$%qg" #define CTRLBIT 0x04
E{^^^"z P #define ALTBIT 0x02
E:A!wS`" #define SHIFTBIT 0x01
IhonnLLW #pragma data_seg("shareddata")
L ^Y3=1#"g HHOOK hHook =NULL;
Z[#IfbYt UINT nHookCount =0;
Ueyw;Y static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
n[k1np$7?6 static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
?T*";_o,B static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
XF,<i1ZlM static int KeyCount =0;
)q^ Bj$ static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
P;91~``b- #pragma data_seg()
f@z*3I; HINSTANCE hins;
L/r{xS void VerifyWindow();
vE\lp8j+ BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
q(]f]Vl|0 //{{AFX_MSG_MAP(CHookApp)
`| 9K u // NOTE - the ClassWizard will add and remove mapping macros here.
Lyoor1 // DO NOT EDIT what you see in these blocks of generated code!
QXQ //}}AFX_MSG_MAP
Bku'H END_MESSAGE_MAP()
hw,^G5m >]$aoA# CHookApp::CHookApp()
}C6@c1myq- {
Q7Ij4 // TODO: add construction code here,
c?6d2jH. // Place all significant initialization in InitInstance
Q_P5MLU> }
L7q | ^` H^(L90 CHookApp theApp;
v[#)GB
_5 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
cdp0!W4Gi {
D1"7s,Hmu BOOL bProcessed=FALSE;
/8e W@IO.F if(HC_ACTION==nCode)
c~tAvDX {
vjK, I9 if((lParam&0xc0000000)==0xc0000000){// Key up
0-xCp ~vE switch(wParam)
vA?_-. J {
n6f3H\/P& case VK_MENU:
#ooc)), MaskBits&=~ALTBIT;
f'{>AKi=C break;
'h*Zc}Q: case VK_CONTROL:
'U)8rR MaskBits&=~CTRLBIT;
:m`/Q_y" break;
gue(C(~.k_ case VK_SHIFT:
1L[S*X MaskBits&=~SHIFTBIT;
MW@ DXbKVl break;
XVUf,N, default: //judge the key and send message
~775soN break;
J?jeYW }
:R+],m il for(int index=0;index<MAX_KEY;index++){
\C/z%Hf7- if(hCallWnd[index]==NULL)
g_ M-F continue;
6E+=Xi if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
*T4ge|zUc {
5u,sx664 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
R;THA! bProcessed=TRUE;
JSjYC0e }
q|{tQJfYg }
k>{-[X,/OV }
Z=9dMND else if((lParam&0xc000ffff)==1){ //Key down
G[6=u|(M switch(wParam)
tA qs2 {
< l[`"0 case VK_MENU:
V\zsDP MaskBits|=ALTBIT;
`^%GN8d}nm break;
"6V_/u5M;= case VK_CONTROL:
hEOJb
@:R MaskBits|=CTRLBIT;
$FCw$ +w break;
^Kw(&v case VK_SHIFT:
/=M.-MU2 MaskBits|=SHIFTBIT;
v MWC(m break;
faVS2TN4 default: //judge the key and send message
s^PmnFR break;
Y'_ D<Mp }
g{a d0.y, for(int index=0;index<MAX_KEY;index++)
{Gkn_h-^ {
)6G+ tU' if(hCallWnd[index]==NULL)
|Ow$n continue;
7SHo%bA if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Gg+YfY_ {
n\~yX<;X3 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
m|dF30~A bProcessed=TRUE;
1UyH0`& }
Fe4esg-B< }
w4}(Ab<Y }
>@Khm"/T if(!bProcessed){
JS2!)aqc for(int index=0;index<MAX_KEY;index++){
{G.{ad if(hCallWnd[index]==NULL)
6QptKXu7 continue;
y Hw!#gWM if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
bV7QVu8 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
rxkBg0Z`a }
mt .,4 }
4`0;^K. }
D[W}[r return CallNextHookEx( hHook, nCode, wParam, lParam );
2$Y3[$ }
%0(>!SY 6cZ C BOOL InitHotkey()
HjPH {
L4mTs-M. if(hHook!=NULL){
hGKdGu`0 nHookCount++;
+}]wLM}\UF return TRUE;
@}{VM)Fc+ }
I)uASfT$ else
Y;PDZbK3 hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
5oa]dco if(hHook!=NULL)
Sl~C0eO nHookCount++;
-(ER4# return (hHook!=NULL);
h=mv9=x }
Faw. GU BOOL UnInit()
Q
}8C {
nTQ (JDf if(nHookCount>1){
&`5 :GLV nHookCount--;
lc-*8eS return TRUE;
+{bh }
v_.j/2U BOOL unhooked = UnhookWindowsHookEx(hHook);
[ 1D)$" if(unhooked==TRUE){
A'(k
Yc nHookCount=0;
vev8l\ hHook=NULL;
,XP@ pi }
'|+=B u return unhooked;
m"1
? }
p!V)55J* @@xF#3 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
`}n0=E {
/3;=xZq BOOL bAdded=FALSE;
l>33z_H^ for(int index=0;index<MAX_KEY;index++){
";58B}ki if(hCallWnd[index]==0){
_"`/^L`Q? hCallWnd[index]=hWnd;
P:vX }V |[ HotKey[index]=cKey;
k.ww-nH HotKeyMask[index]=cMask;
j[BgP\&, bAdded=TRUE;
!-@SS> KeyCount++;
wf^cyCR0 break;
_4De!q0( }
lHRK'?Q }
^&e;8d|f{ return bAdded;
QTJrJD }
ol1AD: Ho ]dQZ8yVK BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
|Yg}WHm {
<`b|L9 BOOL bRemoved=FALSE;
f61]`@Bk for(int index=0;index<MAX_KEY;index++){
ug>]U ~0 if(hCallWnd[index]==hWnd){
E ,Dlaq if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
)z|_*||WU^ hCallWnd[index]=NULL;
J\9jsx!WQ HotKey[index]=0;
F\l!A'Q+t HotKeyMask[index]=0;
ZlUFJ*pk bRemoved=TRUE;
I\)N\move KeyCount--;
+# A|Zp< break;
jh-kCF }
mRNHq3 }
S:DcfR=a }
+ 4++Z return bRemoved;
d
u_O} x }
vHoT@E#}' !k ;[^> void VerifyWindow()
',<{X(#( {
P[r}(@0rJ for(int i=0;i<MAX_KEY;i++){
A89Y;_4y if(hCallWnd
!=NULL){ 4{uJ||!
if(!IsWindow(hCallWnd)){ ei(|5h
hCallWnd=NULL; R#rh
HotKey=0; \Gv- sA
HotKeyMask=0; s"gKonwI2
KeyCount--; 15RI(BN
} Hd96[Uo
} B/[hi%~
} ^!XU+e+:0
} HE4`9$kVLr
qLU15cOM
BOOL CHookApp::InitInstance() Ul7,k\q@
{ pvK \fSr
AFX_MANAGE_STATE(AfxGetStaticModuleState()); 1j_aH#Fz:
hins=AfxGetInstanceHandle(); }C9VTJs|
InitHotkey(); &n,xGIG
return CWinApp::InitInstance(); ' h0\4eu
} /6?tgr
C8O7i[uc
int CHookApp::ExitInstance() "@F*$JGT y
{ OD>u$tI9
VerifyWindow(); !:R^}pMhIk
UnInit(); U]1>?,Nk'3
return CWinApp::ExitInstance(); N GX-'w
} b*9m2=6
:C}KI)
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file $L $j
KNwf
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) S+4I[|T]Y
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Ta!m%=8
#if _MSC_VER > 1000 pO@k@JZ
#pragma once +^o3}`
#endif // _MSC_VER > 1000 ]a&x'
@8T
Vr2uy
class CCaptureDlg : public CDialog qhv4R| )
{ il 8A&`%
// Construction vUA)#z<
public: d7n4zx1Hh
BOOL bTray; LL6ON
}
BOOL bRegistered; fbW,0
BOOL RegisterHotkey(); MV:<w3!
UCHAR cKey; Lk$Je
O
UCHAR cMask; S.?\>iH[
void DeleteIcon(); |>m# m*{S
void AddIcon(); !ds"88:5^
UINT nCount; 1VPfa
void SaveBmp(); t/EMBfLc
CCaptureDlg(CWnd* pParent = NULL); // standard constructor Y:#kel<
// Dialog Data ~`W6O>
//{{AFX_DATA(CCaptureDlg) 2xz%'X%
enum { IDD = IDD_CAPTURE_DIALOG }; '2i)#~YO<
CComboBox m_Key; !rN#PF>
BOOL m_bControl; `t/@ L:
BOOL m_bAlt; pEqr0Qwh
BOOL m_bShift; '=@H2T6=
CString m_Path; !nqm ;96
CString m_Number; C_g"omw40
//}}AFX_DATA rA>A=,
// ClassWizard generated virtual function overrides uH~ TugQ~
//{{AFX_VIRTUAL(CCaptureDlg) +A.a~Stt
public: @8x6#|D
virtual BOOL PreTranslateMessage(MSG* pMsg); 3e!a>Gl*
protected: Q:Nwy(,I
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 2!"\;/
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ,AFC 1t[0
//}}AFX_VIRTUAL ~ L i%
// Implementation : Oz7R:
protected: Sj=69>m]5
HICON m_hIcon; ?Sd~u1w8K
// Generated message map functions !Sr0Im0
//{{AFX_MSG(CCaptureDlg) 2rE~V.)%
virtual BOOL OnInitDialog(); H8Z Z@@ qm
afx_msg void OnSysCommand(UINT nID, LPARAM lParam);
!EyGJa[i
afx_msg void OnPaint(); 8M(|{~~3:
afx_msg HCURSOR OnQueryDragIcon(); is_dPc
virtual void OnCancel(); Q'%5"&XFD
afx_msg void OnAbout(); J7 zVi
afx_msg void OnBrowse(); !<UEq`2
afx_msg void OnChange(); Z1MJ!{@6
//}}AFX_MSG ?AM8*w
DECLARE_MESSAGE_MAP()
EY[Q%
}; Bb2r95h}^
#endif aZ`_W|
olQ8s*
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file AD4L`0D
#include "stdafx.h" 6@Z'fT4
#include "Capture.h" s5Bmv\e.i5
#include "CaptureDlg.h" Z2pN<S{5
#include <windowsx.h> \w@_(4")Qb
#pragma comment(lib,"hook.lib") ]oWZ{#r2
#ifdef _DEBUG :6Pc m3
#define new DEBUG_NEW #|*,zIYo
#undef THIS_FILE Q i'WV9ke
static char THIS_FILE[] = __FILE__; ,VcDvZ7
#endif ^:rNoo
#define IDM_SHELL WM_USER+1 GJl@ag5h]!
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); +8@`lDnr
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); +e3WwUx
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; o-e,
class CAboutDlg : public CDialog [C~)&2wh>
{ ^Hhw(@`qf
public: %JA&O
CAboutDlg(); >[P7Zlwv4
// Dialog Data ws=9u-
//{{AFX_DATA(CAboutDlg) GVHfN5bTqn
enum { IDD = IDD_ABOUTBOX }; +68K[s,FD
//}}AFX_DATA ~)_ ?:.Da
// ClassWizard generated virtual function overrides :pF]TY"K.
//{{AFX_VIRTUAL(CAboutDlg) O]r3?=
protected: la"A$Tbu~
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support G*wW&R)
//}}AFX_VIRTUAL re 1k]
// Implementation g:3'x/a1
protected: A>1p]#
//{{AFX_MSG(CAboutDlg) .0*CT:1=0
//}}AFX_MSG GPqB\bxb'
DECLARE_MESSAGE_MAP() A(@gv8e[H^
}; UEYM;$_@4o
EwBN+v;)
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) tP^mq>
{ p31rhe
//{{AFX_DATA_INIT(CAboutDlg) SAo\H
//}}AFX_DATA_INIT I3rnCd(
}
I~5fz4Q
O[(HE8E
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ?e|:6a+[f
{ E<G@LT
CDialog::DoDataExchange(pDX); -$MC
//{{AFX_DATA_MAP(CAboutDlg) "i<3}6/*
//}}AFX_DATA_MAP MHT,rqG
} w5/X{
`zOAltfd
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) <B{VL8IA>
//{{AFX_MSG_MAP(CAboutDlg) Wv*BwiQ
// No message handlers $^D(%
//}}AFX_MSG_MAP (>5VS
END_MESSAGE_MAP() 3L%r_N*a
FC-*?
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) po$ynp756
: CDialog(CCaptureDlg::IDD, pParent) mW(_FS2%,
{ ?OYwM?Uf
//{{AFX_DATA_INIT(CCaptureDlg) RDZh>K
PG
m_bControl = FALSE; a4qpnr]0
m_bAlt = FALSE; sluZ-,zE
m_bShift = FALSE; j[ZniD
m_Path = _T("c:\\"); xW;[}t-QS
m_Number = _T("0 picture captured."); G~hILW^
nCount=0; > FcA,
bRegistered=FALSE; C05{,w?
bTray=FALSE; qsRfG~Cg
//}}AFX_DATA_INIT "91Atb;hJ
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 W]Y!ZfGnN
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); @`+$d=rO`
} gsq[ 9
f(MHU
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) LOG*K;v3
{ k@)m- K
CDialog::DoDataExchange(pDX); 714nUA872
//{{AFX_DATA_MAP(CCaptureDlg) 3R[J,go
DDX_Control(pDX, IDC_KEY, m_Key); E9*?G4P{l
DDX_Check(pDX, IDC_CONTROL, m_bControl); 1YD.jU^;HD
DDX_Check(pDX, IDC_ALT, m_bAlt); Tvw2py q
DDX_Check(pDX, IDC_SHIFT, m_bShift); 1~u\]Zi=D
DDX_Text(pDX, IDC_PATH, m_Path); j#>![km Mu
DDX_Text(pDX, IDC_NUMBER, m_Number); &EJ,k'7$
//}}AFX_DATA_MAP 1Y"qQp
} Ri6 br
=ZIFS
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) eV=sDx
//{{AFX_MSG_MAP(CCaptureDlg) ./*,Thc
ON_WM_SYSCOMMAND() jL).B&
ON_WM_PAINT() T:~W.3
ON_WM_QUERYDRAGICON()
(mD:[|.
ON_BN_CLICKED(ID_ABOUT, OnAbout) PL_wa(}y]D
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 3rdxXmx
ON_BN_CLICKED(ID_CHANGE, OnChange) 2DqHqq9m
//}}AFX_MSG_MAP SK}g(X7IWH
END_MESSAGE_MAP() kQ'xs%Fw
? /X6x1PN
BOOL CCaptureDlg::OnInitDialog() MC)W?
{ Y+yvv{01
CDialog::OnInitDialog(); n.UM+2G
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); >#n-4NZ;p9
ASSERT(IDM_ABOUTBOX < 0xF000); ZO6bG$y64
CMenu* pSysMenu = GetSystemMenu(FALSE); Wv/5#_
if (pSysMenu != NULL) ~{$'s p0
{ ZUI9[A?
CString strAboutMenu; 4xn^`xf9
strAboutMenu.LoadString(IDS_ABOUTBOX); a}7KpKCD
if (!strAboutMenu.IsEmpty()) #UeU:RJ1
{ A8/4:>Is
pSysMenu->AppendMenu(MF_SEPARATOR); yf^gU*
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); +~.Jw#HqS
} Tka="eyIj3
} mBkQ
8e
SetIcon(m_hIcon, TRUE); // Set big icon |Qm%G\oB?
SetIcon(m_hIcon, FALSE); // Set small icon 0]0M>vx
u
m_Key.SetCurSel(0); `ViNSr):J
RegisterHotkey(); :>ST)Y@]w
CMenu* pMenu=GetSystemMenu(FALSE); < io8
b|A
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); %=
;K>D
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); :@A;!'zpL
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); M
+q7h+HP
return TRUE; // return TRUE unless you set the focus to a control V)jhyCL
} YVp0}m
:2gO)
'cD
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) vrx3O
{ CnA)>4E*'
if ((nID & 0xFFF0) == IDM_ABOUTBOX) emIbGkH
{ Pg C]@Q%
CAboutDlg dlgAbout; G"sc;nT
dlgAbout.DoModal(); m 4LM10
} RA67w&
else %b4(wn?n:B
{ /UyE- "S
CDialog::OnSysCommand(nID, lParam); ,.F+x}
} $oj<yH<i
} [kkcV5I-
Z}S tA0F_
void CCaptureDlg::OnPaint() ,R6$SrNcd
{ XKIJ6M~5k
if (IsIconic()) k5
l~
{ xF+x I6
CPaintDC dc(this); // device context for painting M_I\:Q
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 9DE)5/c`v
// Center icon in client rectangle @6`@.iZ
int cxIcon = GetSystemMetrics(SM_CXICON); +c_CYkHJ/
int cyIcon = GetSystemMetrics(SM_CYICON); !Ve3:OZ.nO
CRect rect; xWV7#Z7
GetClientRect(&rect); G<1mj!{Vp
int x = (rect.Width() - cxIcon + 1) / 2; >(a_9l;q
int y = (rect.Height() - cyIcon + 1) / 2; Xq^{P2\w1
// Draw the icon "
N4]e/.V
dc.DrawIcon(x, y, m_hIcon); niBpbsO
} L]")TQ
else 4`]1W,t
{ 1_]l|`Po
CDialog::OnPaint(); e|y~q0Q$
} "ET"dMxU
} #JM*QVzv
biK.HL\V
HCURSOR CCaptureDlg::OnQueryDragIcon()
&|*|
{ wyM3|%RZ
return (HCURSOR) m_hIcon; d<e.`dhc
} /Vc!N)
D~>P/b)v{j
void CCaptureDlg::OnCancel() an~Kc!Oki
{
KguFU
if(bTray) <{uIB;P
DeleteIcon(); YdaJ&
CDialog::OnCancel(); Vtri"G8 aB
} (#k#0T kE
d a9 *>+[
void CCaptureDlg::OnAbout() nfB9M1Svn
{ hiuPvi}
CAboutDlg dlg; w+H=Xh4t
dlg.DoModal();
7]bqs"t
} 0T;WN$W|
&Y$rVBgQ
void CCaptureDlg::OnBrowse() H\vO0 <X
{ 5H2|:GzUc
CString str;
)G&OX
BROWSEINFO bi; Kfl+8UR5=
char name[MAX_PATH]; =QRZ(2Wq
ZeroMemory(&bi,sizeof(BROWSEINFO)); ZS]e}]Zwp
bi.hwndOwner=GetSafeHwnd(); ESI}+
bi.pszDisplayName=name; D%v yO_k
bi.lpszTitle="Select folder"; Wd#6Y}:
bi.ulFlags=BIF_RETURNONLYFSDIRS; ]B||S7idq
LPITEMIDLIST idl=SHBrowseForFolder(&bi); 'Ud5;?{
if(idl==NULL) zFIKB9NUn
return; ]=Q'1%
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); +/tD$
str.ReleaseBuffer(); GS%Dn^l
m_Path=str; I'wAgf6W
if(str.GetAt(str.GetLength()-1)!='\\') X)+N>8o?N
m_Path+="\\"; ^xrR3m*d
UpdateData(FALSE); MiRB*eA
} ~5b %~:
107SXYdhI
void CCaptureDlg::SaveBmp() EzaOg|
{ uPPe"$
CDC dc; gu!A:Q
dc.CreateDC("DISPLAY",NULL,NULL,NULL); arJ[.f9s
CBitmap bm; K(^x)w r-:
int Width=GetSystemMetrics(SM_CXSCREEN); P.0-(
int Height=GetSystemMetrics(SM_CYSCREEN); I(e>ff
bm.CreateCompatibleBitmap(&dc,Width,Height); *RO ~%g
CDC tdc; ~S9nLb:O{
tdc.CreateCompatibleDC(&dc); FKP^f\!M
CBitmap*pOld=tdc.SelectObject(&bm); PhQD}|S
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); K^ lVng
tdc.SelectObject(pOld); frt?*|:
BITMAP btm; =zKp(_[D
bm.GetBitmap(&btm); x$E
l7=.
DWORD size=btm.bmWidthBytes*btm.bmHeight; pFuQ!7Uk
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); $O#h4L_
BITMAPINFOHEADER bih; >*MB_m2|
bih.biBitCount=btm.bmBitsPixel; 6dh PqL
bih.biClrImportant=0; =|V3cM4'
bih.biClrUsed=0; 6`i'
bih.biCompression=0; ZI1RB fR
bih.biHeight=btm.bmHeight; zV]0S o
bih.biPlanes=1; pP#?|
bih.biSize=sizeof(BITMAPINFOHEADER);
tXx9N_/
bih.biSizeImage=size;
O>3'ylBQ
bih.biWidth=btm.bmWidth; q%"nk
bih.biXPelsPerMeter=0; m:t$&
bih.biYPelsPerMeter=0;
1Sy#*
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ,rKN/{M!
static int filecount=0; DCm;dh
CString name; DuWP)#kg
name.Format("pict%04d.bmp",filecount++); ~gf$ L9
name=m_Path+name; LLE~V~j
BITMAPFILEHEADER bfh; e0TnA
N
bfh.bfReserved1=bfh.bfReserved2=0; ) E\pQ5&
bfh.bfType=((WORD)('M'<< 8)|'B'); @l8?\^N
bfh.bfSize=54+size; SCo9[EJ
bfh.bfOffBits=54; UpITx]y?"m
CFile bf; [|YMnV<B
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ">o/\sXeH
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); :X#(T-!t
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ch&r.
bf.WriteHuge(lpData,size); x[X.// :
bf.Close(); $#!~K2$
nCount++; ,ZSuo4
} +38t82%YWo
GlobalFreePtr(lpData); VYwaU^
if(nCount==1) s-*XAnot
m_Number.Format("%d picture captured.",nCount); >dM'UpN@
else +%yh@X6
m_Number.Format("%d pictures captured.",nCount); ps]6,@uyB
UpdateData(FALSE); 3B0%:Jj
} ;#
{x_>M
g^idS:GtX5
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) LCG<
{ _YY)-H
if(pMsg -> message == WM_KEYDOWN) }LRAe3N%8
{ U{x'@/Ld
if(pMsg -> wParam == VK_ESCAPE) kB
2bT}
return TRUE; sw&Qks?V
if(pMsg -> wParam == VK_RETURN) .cb mCFXL
return TRUE; Zj JD@,j
} %F7aFvl*
return CDialog::PreTranslateMessage(pMsg); ^ey\ c1K
} m} V,+E
IH0Uq_
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 0C7"*H0R
{ bhI8b/
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ S$#Awen"@
SaveBmp(); myo/}58Nv
return FALSE; )-9/5Z0v
} &`9lIVB,K
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ = FE,G*
CMenu pop; $$4% .J26Z
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); kO4C^pl"v
CMenu*pMenu=pop.GetSubMenu(0); 4
qnQF]4
pMenu->SetDefaultItem(ID_EXITICON); DFiexOb
CPoint pt; 5u&jNU5m_
GetCursorPos(&pt); mB\5bSFY`
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); }N[sydL
if(id==ID_EXITICON) )*uI/E
DeleteIcon(); bIH2cJ
else if(id==ID_EXIT) 1{wy%|H\
OnCancel(); 5xiYCOy
return FALSE; y`N1I
} `XD$1>
LRESULT res= CDialog::WindowProc(message, wParam, lParam); q<1@ut
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) K,R Ia0)
AddIcon(); D,7! /u'
return res; #8`G&S*
} R'F|z{8
cr!I"kTgD
void CCaptureDlg::AddIcon() ka5>9E
{ ugCc&~`
NOTIFYICONDATA data; R6!3Y/Q@
data.cbSize=sizeof(NOTIFYICONDATA); ":Q70*xSm
CString tip; us]ah~U6A
tip.LoadString(IDS_ICONTIP); xj}N;FWo
data.hIcon=GetIcon(0); aCMcu\rd
data.hWnd=GetSafeHwnd(); $lv
g.u
strcpy(data.szTip,tip); v|hi;l@7E
data.uCallbackMessage=IDM_SHELL; K+7xjFoDIR
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; [;2v[&Po
data.uID=98; u66w('2
Shell_NotifyIcon(NIM_ADD,&data); !87ebo
ShowWindow(SW_HIDE); cz0tnF*&
bTray=TRUE; >#'6jm
} b/ynCf8X
bi5'- .B
void CCaptureDlg::DeleteIcon() cx02b-O
{ .`iq+i~
NOTIFYICONDATA data; l"-D@]"
data.cbSize=sizeof(NOTIFYICONDATA); FrVD~;
data.hWnd=GetSafeHwnd(); iU3co|q7
data.uID=98; NO<myN+N
Shell_NotifyIcon(NIM_DELETE,&data); DQ~@=%?ni
ShowWindow(SW_SHOW); X@cV']#V
SetForegroundWindow(); "ZH1W9A
ShowWindow(SW_SHOWNORMAL); c>^_4QQ
bTray=FALSE; c{E-4PYbah
} t512]eqhb(
T^79p$
void CCaptureDlg::OnChange() )&w\9}B:
{ B1GSZUd^?0
RegisterHotkey(); )~J/,\
} &K7g8x"x.
Lt*H|9
BOOL CCaptureDlg::RegisterHotkey() Ah"RxA
{ j/W#=\xz
UpdateData(); f(3#5288
UCHAR mask=0; &38Fj'l
UCHAR key=0; lmod8B
if(m_bControl) bi_R.sfK&
mask|=4; J/mLB7^R
if(m_bAlt) IXH;QwR:
mask|=2; :O{ :;X)
if(m_bShift) SVR AkP-
mask|=1; ;zGGT^Dn
key=Key_Table[m_Key.GetCurSel()]; gh~C.>W}q+
if(bRegistered){ R &-bA3w$
DeleteHotkey(GetSafeHwnd(),cKey,cMask); s0\X%U("
bRegistered=FALSE;
R)H@'X
} ~"LOw_BRh
cMask=mask; dx~F [
cKey=key; 4(Mt6{q
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); #de]b
return bRegistered; 2Gj&7A3b
} F|"NJ*o}
yn7n
四、小结 ZJx:?*0a
:]]amziP&
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。