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:
(]7@0d88
M\`6H8aLn 一、实现方法
fi bR:8 ulj`+D?H 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:
\GMudN n8:2Z> #pragma data_seg("shareddata")
/)oxuk&}c HHOOK hHook =NULL; //钩子句柄
[]dRDe;# UINT nHookCount =0; //挂接的程序数目
da I-* static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
gvcT_' static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
_I$]L8hC static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
>@oO7<WB static int KeyCount =0;
][?GJ"O+U static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
o,aI<5" #pragma data_seg()
HH+rib'u i^QcW!X& 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。
brTB
/(E $7BD~U DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
IloHU6h' A@DIq/^xM BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
UI!EIZ*~ cKey,UCHAR cMask)
[,1j(s`N5 {
gl!3pTC BOOL bAdded=FALSE;
l;|1C[V for(int index=0;index<MAX_KEY;index++){
Q2fa]*Z5 if(hCallWnd[index]==0){
%"KBX~3+Kj hCallWnd[index]=hWnd;
7XwFO0== HotKey[index]=cKey;
OKf/[hyu HotKeyMask[index]=cMask;
nZ%<2 bAdded=TRUE;
fq F1-% KeyCount++;
vkt)!hl ` break;
LXK+WB/s }
:^ cA\2= }
G7),!Qol return bAdded;
]"YG7|E U }
^T<<F}@q //删除热键
wiFckF/
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
?EpY4k8, {
ZAiQofQ:2 BOOL bRemoved=FALSE;
3F4I{L for(int index=0;index<MAX_KEY;index++){
1= <Qnmw if(hCallWnd[index]==hWnd){
;ga~ae=Fg if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
r-!8in2 hCallWnd[index]=NULL;
s\KV\5\o HotKey[index]=0;
t=yM}#r$ HotKeyMask[index]=0;
X GO_n{x bRemoved=TRUE;
zb9$ KeyCount--;
E8V,".!+E break;
@,s[l1P }
QGYmQ9m{kL }
|\b*p:el }
43(+3$V M7 return bRemoved;
$Itehy }
fo5!d@Nv 1YS{;
y[o l9SbuT$U DLL中的钩子函数如下:
q'1rSK >Ks| yNJ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
mT)iN`$Y@ {
yTmoEy. q BOOL bProcessed=FALSE;
Dpof~o,f if(HC_ACTION==nCode)
u/``*=Y@ {
km8[azB o if((lParam&0xc0000000)==0xc0000000){// 有键松开
%*Y:Rm'> switch(wParam)
q5QYp {
a|66[ case VK_MENU:
z?+N3p9 MaskBits&=~ALTBIT;
B'&%EW] break;
-,p(PK case VK_CONTROL:
d7l0;yR&+ MaskBits&=~CTRLBIT;
:;]6\/ky break;
b~cN#w
# case VK_SHIFT:
U*,5t81 MaskBits&=~SHIFTBIT;
:~g=n&x break;
- x7b6o>$ default: //judge the key and send message
S^~GI$ break;
uZg Kex;c }
NbfV6$jo for(int index=0;index<MAX_KEY;index++){
uE+]]ir if(hCallWnd[index]==NULL)
up`!r;5- continue;
!7Ta Vx}`( if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Lymy/9 {
YB~}!F [( SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
qifX7AXHr bProcessed=TRUE;
`2UzJ~ }
lS9rgq<n }
rsA K0R+ }
#(!> else if((lParam&0xc000ffff)==1){ //有键按下
nIKh<ws4z switch(wParam)
l *.#g {
BPe5c :z case VK_MENU:
leX&py MaskBits|=ALTBIT;
{_l@ws break;
a\aJw[d{ case VK_CONTROL:
b=`h""u MaskBits|=CTRLBIT;
i5q
VQo break;
-+ -@Yq$ case VK_SHIFT:
5c!~WckbJ MaskBits|=SHIFTBIT;
XeKIue@_ break;
pjWqI6, default: //judge the key and send message
n<uF9N< break;
gI<TfcC }
| Fm( for(int index=0;index<MAX_KEY;index++){
=gw'MA if(hCallWnd[index]==NULL)
(%YFcE)SRS continue;
+r"{$'{^ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
2D>WIOX {
#jv~FR`4v^ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
g%Sl+gWdJ bProcessed=TRUE;
I!|_C~I` 2 }
VkZrb2]v }
5O%Q*\( }
bO8 g#rO if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
,dLh`t<\ for(int index=0;index<MAX_KEY;index++){
nGZZCsf < if(hCallWnd[index]==NULL)
@~qlSU& continue;
GBFYa6\4sT if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
q
okgu$2 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
3Gubq4r //lParam的意义可看MSDN中WM_KEYDOWN部分
L#1YR}m }
?4P*,c }
$h"tg9L^) }
?suNA return CallNextHookEx( hHook, nCode, wParam, lParam );
:GBWQXb G }
NTkGLD1e. N.vt5WP 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:
yZj:Kp+7 >7[.
{Y BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
wt0^R<28 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
33z)F AKk6kI8F 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:
r({!ejT{U WwG78b-OA LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
xDD3Y{K {
s<Px au+A if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
;}"_hLX {
B"rnSui //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
"7mYs)= SaveBmp();
$6e&sDJ return FALSE;
WvQK$}Ax4N }
j6]+fo&3 …… //其它处理及默认处理
<5X?6*Qvr }
QV,X> !Nz VJmX@zX9 bw\fKZ 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。
veIR)i@dx {>PN}fk2QP 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。
(L} ufyqfID 二、编程步骤
_:DnF =@q 9,H 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";
qkVGa%^ J6J[\ 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
a$H*C(wL F9@,T8I 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;
+y'V ;43Ye
^= 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;
|U)m'W-(q D1]%2: 5、 添加代码,编译运行程序。
41Bp^R}^/ golr,+LSo 三、程序代码
H<T9$7Yr%r #2l6'gWE0 ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
\i_y(; #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
GO0Spf_Gh #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
|<tZ| #if _MSC_VER > 1000
Rj6:.KEJ #pragma once
jR-DH]@y #endif // _MSC_VER > 1000
DY1?37h #ifndef __AFXWIN_H__
k.=67L #error include 'stdafx.h' before including this file for PCH
yZkHBG4 #endif
banie{ e #include "resource.h" // main symbols
C/V{&/5w class CHookApp : public CWinApp
=5=D)x~ {
hpp>+= public:
jusP
aAdW CHookApp();
;ELQIHnD" // Overrides
*AX)QKQ@ // ClassWizard generated virtual function overrides
Cx$C+ //{{AFX_VIRTUAL(CHookApp)
w20E]4" public:
]yu,YZ@7 virtual BOOL InitInstance();
wUkLe-n,dE virtual int ExitInstance();
s!S,;H //}}AFX_VIRTUAL
F%QZe*m[ //{{AFX_MSG(CHookApp)
2_Me
4 // NOTE - the ClassWizard will add and remove member functions here.
St/<\Y,wr // DO NOT EDIT what you see in these blocks of generated code !
<qZ"W6&& //}}AFX_MSG
K|*Cka{ DECLARE_MESSAGE_MAP()
E-h`lDoJ };
DF D5">g@ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
+SCUS] BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
!g:UkU\J BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
_YF~DU BOOL InitHotkey();
pL` snVz BOOL UnInit();
Q]X0O10 #endif
xR+=F1y ?m-kpW8 //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
=w&%29BYq #include "stdafx.h"
<}'hkEh{d= #include "hook.h"
$$C5Q;7w! #include <windowsx.h>
YbZ<=ZzO4 #ifdef _DEBUG
+kCVi #define new DEBUG_NEW
:H[E
W3Q #undef THIS_FILE
'Rk~bAX static char THIS_FILE[] = __FILE__;
E\!:MCL #endif
Bm%.f!` #define MAX_KEY 100
u:H@]z(x #define CTRLBIT 0x04
L^PZ\OC #define ALTBIT 0x02
A(AyLxB47* #define SHIFTBIT 0x01
Gjuc"JR7 #pragma data_seg("shareddata")
\phG$4(7+ HHOOK hHook =NULL;
]*a)'k_@[ UINT nHookCount =0;
bu"Jb4_a> static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
I%xrDiK97 static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
<x@\3{{U static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
X70 vDoW static int KeyCount =0;
z79L2lJn static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
b!hxx Z #pragma data_seg()
g-xbb&] HINSTANCE hins;
qS{lay void VerifyWindow();
Q(m} Sr4 BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
DoWY*2E //{{AFX_MSG_MAP(CHookApp)
[:$j<}UmB // NOTE - the ClassWizard will add and remove mapping macros here.
BXueOvO8 // DO NOT EDIT what you see in these blocks of generated code!
%kD WUJZ //}}AFX_MSG_MAP
#V-qS/ q" END_MESSAGE_MAP()
4@#1G*OO "d'xT/l
" CHookApp::CHookApp()
HCQv"i}- {
OB3AZH$ // TODO: add construction code here,
XboOvdt^| // Place all significant initialization in InitInstance
xt
+fuL }
Tp~yn )Y~q6D K CHookApp theApp;
Rz`<E97- LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
Wf_aEW&n {
Ed#%F-1sX BOOL bProcessed=FALSE;
!_<. 6ja if(HC_ACTION==nCode)
H_;Dq* {
;~z>GJox if((lParam&0xc0000000)==0xc0000000){// Key up
0]8+rWp|Nz switch(wParam)
=B1t?(" {
H*|Bukgt/M case VK_MENU:
,Z_nV+l_ MaskBits&=~ALTBIT;
A4';((OXy break;
/(n)I case VK_CONTROL:
c%pW'UE& MaskBits&=~CTRLBIT;
KGi@H%NN break;
\,
n'D case VK_SHIFT:
lGG1d MaskBits&=~SHIFTBIT;
!QVd'e break;
sLbz@5 4 default: //judge the key and send message
*sJx0<!M} break;
=i%2/kdi0b }
nIph[Vs-Z for(int index=0;index<MAX_KEY;index++){
pY =?r{@ if(hCallWnd[index]==NULL)
nS?HH6H continue;
b{sE#m%r if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
`k\]I |6 {
ZM;EjS1 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
m)_1->K bProcessed=TRUE;
>;xEzc!W3* }
l$m^{6IYc }
Zz?+,-$_*& }
3=bzIU else if((lParam&0xc000ffff)==1){ //Key down
n^&QOII@> switch(wParam)
cIM5;"gLP {
8" 8{Nf-" case VK_MENU:
Qg6m MaskBits|=ALTBIT;
yvDzxu break;
)CR8-z1` case VK_CONTROL:
aE{b65'Dt MaskBits|=CTRLBIT;
iT^lk'?{O break;
sef!hS06 case VK_SHIFT:
?U-p
jjM MaskBits|=SHIFTBIT;
8-?n<h%8E break;
'3hvR4P default: //judge the key and send message
jHz] break;
b:O4d<+% }
;prp6(c for(int index=0;index<MAX_KEY;index++)
Ds}6{']K {
8#Z$}?W if(hCallWnd[index]==NULL)
,+'f unH continue;
;'o>6I7Ph if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
}f-rWe{gs> {
'.kbXw0} SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
aO<d`DTyJ bProcessed=TRUE;
7H>dv' }
9h0|^ttF }
=u;q98r }
N@d4) if(!bProcessed){
xq~=T:>/A for(int index=0;index<MAX_KEY;index++){
YYM if(hCallWnd[index]==NULL)
`7
B
[< continue;
"V:UQ<a\ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
%xk]y&jv SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
6w]]KA }
qob!!A14p }
u8,T>VNVw }
)7`~U"r return CallNextHookEx( hHook, nCode, wParam, lParam );
7olA@;$ }
WYzY#-j 4@W.{|2~ BOOL InitHotkey()
rU~"A {
Sqge5 v if(hHook!=NULL){
1bDc ct nHookCount++;
LnyA 5T return TRUE;
Q@j:b]Y9 }
:-
5Mn3* else
&a(w0< hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
s3knh&'zb if(hHook!=NULL)
~g,QwaA[ nHookCount++;
Ebk@x=E return (hHook!=NULL);
[{c8:)ar }
p,0 \NUC BOOL UnInit()
07MLK8jS {
a&cV@~ if(nHookCount>1){
Bh.'%[', nHookCount--;
tvH)I px return TRUE;
q>X:z0H }
jGWLYI=V2 BOOL unhooked = UnhookWindowsHookEx(hHook);
H9Z3.F(2 if(unhooked==TRUE){
~iSW^mi nHookCount=0;
8]L.E hHook=NULL;
?=G H{
%E }
3HiW1*5W return unhooked;
7/yd@#$X }
9c 6V&b WT)")0)[ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
`fRy"44nR {
^
Q}1&w% BOOL bAdded=FALSE;
3$b(iI< " for(int index=0;index<MAX_KEY;index++){
`sXx,sV?B if(hCallWnd[index]==0){
5C&f-* Bh hCallWnd[index]=hWnd;
{V&7JZl,/ HotKey[index]=cKey;
|)_R
bqZ HotKeyMask[index]=cMask;
#(H_w4 bAdded=TRUE;
ig,|3( KeyCount++;
IO'Q}bU4vs break;
nXS%>1o, }
P:TpB6.=q }
vB{b/xmah return bAdded;
K6U>Qums }
._3NqE; #Q"vwek BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
(D{}1sZBQ {
5HN<*u%z BOOL bRemoved=FALSE;
85
hYYB0v for(int index=0;index<MAX_KEY;index++){
Y<+4>Eh if(hCallWnd[index]==hWnd){
bM-Rj1#Lo if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
Uk9g^\H<D hCallWnd[index]=NULL;
B`aAvD`7 HotKey[index]=0;
WdAGZUp HotKeyMask[index]=0;
pYG,5+g bRemoved=TRUE;
t["Df;"O KeyCount--;
(0Cszm. break;
VZoOdR:d }
->8q, W2A }
3Y-v1.^j }
E'8Bw7Tz return bRemoved;
m #QI*R
XP }
G{.+D2 s>\g03= void VerifyWindow()
O:)IRB3 {
e 63|Z[8 for(int i=0;i<MAX_KEY;i++){
(Y)h+}n5N if(hCallWnd
!=NULL){ D8Rmxq!
if(!IsWindow(hCallWnd)){ uN
62>
hCallWnd=NULL; a`*WpP \+
HotKey=0; m!60.
HotKeyMask=0; sV[Z|$&Z
KeyCount--; XB-|gPk
} PEEY;x
} Nh9!lB m*]
} 0
0&$SE
} %}XMhWn{
+3>/,w(x
BOOL CHookApp::InitInstance() ~iZF~PQ1_
{ F |81i$R
AFX_MANAGE_STATE(AfxGetStaticModuleState()); Qu FCc1Q
hins=AfxGetInstanceHandle(); RCYbRR4y
InitHotkey(); -/c1qLdQ
return CWinApp::InitInstance(); tQ
JH'YV
} lO> 7`2x=F
(B,t
1+%
int CHookApp::ExitInstance() sDm},=X}
{ $S8bp3)
VerifyWindow(); \BaN5+B6
UnInit(); "!6~*!]c
return CWinApp::ExitInstance(); j :Jdwf
} ptyDv
;n{j,HB
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 0C+yq'D~[
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Q
EGanpz
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ `OReSg
2
#if _MSC_VER > 1000 Z?c=t-yqp
#pragma once y'|W['
#endif // _MSC_VER > 1000 `Mn{bd
C%?D E@k
class CCaptureDlg : public CDialog ,tF" 4|#
{
"rDzrz
// Construction (Zn3-t*
public: lEbR) B,
BOOL bTray; k;AiG8jb
BOOL bRegistered; k>;r9^D
BOOL RegisterHotkey(); IA 9v1:>
UCHAR cKey; 7K]U|K#
UCHAR cMask; VE"0VB.
void DeleteIcon(); $_7d! S"
void AddIcon(); _B7?C:8Q-
UINT nCount; `{Di*
void SaveBmp(); P}WhE
CCaptureDlg(CWnd* pParent = NULL); // standard constructor 4U
a~*58
// Dialog Data l)PFzIz=V
//{{AFX_DATA(CCaptureDlg) JS7}K)A2B6
enum { IDD = IDD_CAPTURE_DIALOG }; <\9Ijuq}k
CComboBox m_Key; QRZTT qG
BOOL m_bControl; "ko?att~
BOOL m_bAlt; ><
_Z
BOOL m_bShift; :f
!=_^}
CString m_Path; A"<)(M+kG
CString m_Number; ^%8Hvy
//}}AFX_DATA Y=Ar3O*F
// ClassWizard generated virtual function overrides -f;j1bQ
//{{AFX_VIRTUAL(CCaptureDlg) p<0kmA<B/
public: i_'R"ob{S
virtual BOOL PreTranslateMessage(MSG* pMsg); c>WpO Z,
protected: UFIAgNKl
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Up/u|A$0V
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); >&Ui*
//}}AFX_VIRTUAL wI]R+.
// Implementation `\4JwiPo
protected: 0O['-x
HICON m_hIcon; {cyo0-9nv
// Generated message map functions x [{q&N!"`
//{{AFX_MSG(CCaptureDlg) <&Y}j&(
virtual BOOL OnInitDialog(); z1SMQLk
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); HSr"M.k5
afx_msg void OnPaint(); lfpt:5a9&
afx_msg HCURSOR OnQueryDragIcon(); ug6f
virtual void OnCancel(); ZaUcP6[h
afx_msg void OnAbout(); .1z$ A
afx_msg void OnBrowse(); lgjoF_D
afx_msg void OnChange(); ?4,*RCaI
//}}AFX_MSG 2c>H(t h=
DECLARE_MESSAGE_MAP() &DbGyV8d"|
}; [>M*_1F
#endif $G-N0LV
ox\B3U%`p}
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file fdq^!MWTi
#include "stdafx.h" X\3,NR,
#include "Capture.h" #-gGsj;F
#include "CaptureDlg.h" nzE,F\k
#include <windowsx.h> Ky'3z"
#pragma comment(lib,"hook.lib") H ?=pWB
#ifdef _DEBUG #EQx
#define new DEBUG_NEW sQ>B_Y!
#undef THIS_FILE _L:i=.hxN
static char THIS_FILE[] = __FILE__; Z*)y.i `
#endif BudWbZ5>Ep
#define IDM_SHELL WM_USER+1 I"F
.%re
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); )S wG+k,
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); kh>SrW]B%
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; &8X
.!r`f
class CAboutDlg : public CDialog 9#EHXgz
{ "3Xv%U9@
public: LpiHoavv
CAboutDlg(); #E$Z[G]
// Dialog Data 94p:| 5@
//{{AFX_DATA(CAboutDlg) x#:BE
enum { IDD = IDD_ABOUTBOX }; [`hE^chd
//}}AFX_DATA sx[&4 k[
// ClassWizard generated virtual function overrides /+x#V!zM
//{{AFX_VIRTUAL(CAboutDlg) [yYH>~SuwZ
protected: ;Txv-lfS
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support =YXe1$ $
//}}AFX_VIRTUAL x:A-p..e
// Implementation {w |dM#
protected: k"q!|+&Fs
//{{AFX_MSG(CAboutDlg) nL":0!DTRD
//}}AFX_MSG $TD~k;
DECLARE_MESSAGE_MAP() +&7[lsD*
}; FUyB"-<
Xx3g3P
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) /i-xX*
{ }XGMa?WR
//{{AFX_DATA_INIT(CAboutDlg) t
g
KG&
//}}AFX_DATA_INIT MG7 ?N #
} <THZ2`tTK3
H[BD)
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ZR;8rZ](
{ QQg8+{>
CDialog::DoDataExchange(pDX); &dhcKO<4
//{{AFX_DATA_MAP(CAboutDlg) b!'l\~`{i
//}}AFX_DATA_MAP A9\]3 LY
} Pl rkgS0J
X(Y#9N"
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) v`#j
//{{AFX_MSG_MAP(CAboutDlg) ia%z+:G
// No message handlers HE#,(;1i
//}}AFX_MSG_MAP DS#cm3
END_MESSAGE_MAP() {fGd:2dh
_ztZ>'
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) B :.@Qi^
: CDialog(CCaptureDlg::IDD, pParent) GVmC }>z
{ CS/Mpmsp
//{{AFX_DATA_INIT(CCaptureDlg) {]wIM^$6+
m_bControl = FALSE; _GVE^yW~z
m_bAlt = FALSE; B.89_!/:p
m_bShift = FALSE; f4]N0
m_Path = _T("c:\\"); /y}"M
m_Number = _T("0 picture captured."); #O2wyG)oU
nCount=0; uije#cj#O
bRegistered=FALSE; 2v0!` &?M{
bTray=FALSE; ifXW
//}}AFX_DATA_INIT XDPL;(?
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 j|:dYt`WM
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); K(<$.
} &&[zT/]P
ojHhT\M`
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) O^5UB~
{ ^_v[QV
CDialog::DoDataExchange(pDX); 6cM<>&e
//{{AFX_DATA_MAP(CCaptureDlg) \+-zRR0
DDX_Control(pDX, IDC_KEY, m_Key); f|OI`
DDX_Check(pDX, IDC_CONTROL, m_bControl); 4-mVB wq
DDX_Check(pDX, IDC_ALT, m_bAlt); 3sH\1)Zz
DDX_Check(pDX, IDC_SHIFT, m_bShift); D^Te%qnW
DDX_Text(pDX, IDC_PATH, m_Path); PU W[e%
DDX_Text(pDX, IDC_NUMBER, m_Number); vxZg &SRK
//}}AFX_DATA_MAP .*BA 1sjE
} nqT> qS[Z
/Rj#sxtdw
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) XAe\s`
//{{AFX_MSG_MAP(CCaptureDlg) $9K(F~/
ON_WM_SYSCOMMAND() v:E;^$6Vn
ON_WM_PAINT() [F+(^- (
ON_WM_QUERYDRAGICON() >OV<_(S4
ON_BN_CLICKED(ID_ABOUT, OnAbout) #ZJMlJ:q`"
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) $B\ H
ON_BN_CLICKED(ID_CHANGE, OnChange) *ZaaO^!
//}}AFX_MSG_MAP h4_b!E@
END_MESSAGE_MAP() |( G2K'Ab
(89Ji'dc
BOOL CCaptureDlg::OnInitDialog() &)n_]R#)
{ }Z\wH*s`
CDialog::OnInitDialog(); l
_+6=u
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Y25^]ON*\^
ASSERT(IDM_ABOUTBOX < 0xF000); iK#/w1`
CMenu* pSysMenu = GetSystemMenu(FALSE); FZF @
if (pSysMenu != NULL) ef=K_,
_
{ `5q
;ssu
CString strAboutMenu; `1Zhq+s
strAboutMenu.LoadString(IDS_ABOUTBOX); Q$~n/
if (!strAboutMenu.IsEmpty()) yhpz5[AuO
{ kZLMtj-
pSysMenu->AppendMenu(MF_SEPARATOR); V|'1tB=;*1
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); }g|nz8
} Ha%F"V*
} 8Hi!kc;f6>
SetIcon(m_hIcon, TRUE); // Set big icon i^)WPP>4Aw
SetIcon(m_hIcon, FALSE); // Set small icon ]N^*tO
m_Key.SetCurSel(0); j(eFoZz,
RegisterHotkey(); Ye5jB2Z
CMenu* pMenu=GetSystemMenu(FALSE); <xo-Fv
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); + H_MV=A^
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); o%`Xa#*Ly
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); (u hd "
return TRUE; // return TRUE unless you set the focus to a control Ya#h'+}
} "0CjP+1k
eS'yGY0b
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) \L # INP4~
{ t{dSX?<nt
if ((nID & 0xFFF0) == IDM_ABOUTBOX) 2 rN ,D(
{ w8Vw1wW
CAboutDlg dlgAbout; !2tW$BP^
dlgAbout.DoModal(); sbj";h=E
} RO&H5m r%@
else ;apzAF
{ jjzA .8?(7
CDialog::OnSysCommand(nID, lParam); 9zBMlc$X
} 1u|V`J)0
} ~+G#n"P n
w%y\dIeI'
void CCaptureDlg::OnPaint() _Ov;4nt!
{ XL$* _c <)
if (IsIconic()) D)@XoM(
{ w Q+8\ s=
CPaintDC dc(this); // device context for painting i3VW1~ .8
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); "*z_O
// Center icon in client rectangle ememce,Np
int cxIcon = GetSystemMetrics(SM_CXICON); b'YE9E
int cyIcon = GetSystemMetrics(SM_CYICON); !#2=\LUC
CRect rect; T ?Fcohz(
GetClientRect(&rect); 1f'Hif*r_X
int x = (rect.Width() - cxIcon + 1) / 2; ziE*'p
int y = (rect.Height() - cyIcon + 1) / 2; CO:u1?
// Draw the icon N K]B?
dc.DrawIcon(x, y, m_hIcon); S6d`ioi-
} k S#
CEU7
else L!Cz'm"Nl
{ o Y}]UB>
CDialog::OnPaint(); nmU_N:Y
} +pm[f["C.
} `d]IX^;
e({9]
HCURSOR CCaptureDlg::OnQueryDragIcon() xNK1h-t
{ Ycr3HLJy
return (HCURSOR) m_hIcon; %V`F!D<D
} %+>s#Q2d
}A=y=+4j
void CCaptureDlg::OnCancel() /iC;%r1L
{ + @9.$6N
if(bTray) 2&PPz}Sw
DeleteIcon(); !" #9<~Q,p
CDialog::OnCancel(); rl#vE's6.e
} $rF=_D6
j(:I7%3&(*
void CCaptureDlg::OnAbout() f3j{V N
{ OO dSKf8
CAboutDlg dlg; KlV:L 4a~
dlg.DoModal(); '^BV_ QQ
} acP+3u?r
le +R16Z
void CCaptureDlg::OnBrowse() 3A:q7#m
{ =*qD4qYA
CString str; =gfI!w
BROWSEINFO bi; u]
:m"LM
char name[MAX_PATH]; n+@F`]Ke
ZeroMemory(&bi,sizeof(BROWSEINFO)); {>LIMG-f
bi.hwndOwner=GetSafeHwnd(); X"gCRn%tn
bi.pszDisplayName=name; hz;|NW{u
bi.lpszTitle="Select folder"; 1g##sSa6
bi.ulFlags=BIF_RETURNONLYFSDIRS; D(p\0V
LPITEMIDLIST idl=SHBrowseForFolder(&bi); `RU[8@ 2%
if(idl==NULL) V.ht,
~l
return; 8l}1c=A}Vi
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); E$9Ys
str.ReleaseBuffer(); [b{CkX06
m_Path=str; iGB_{F~t4}
if(str.GetAt(str.GetLength()-1)!='\\') 4'$g(+z
m_Path+="\\"; J"=1/,AS
UpdateData(FALSE); %ms'n
} }$MN|s
X[#zCM
void CCaptureDlg::SaveBmp() H&r,FmI@
{ m)V/L]4
CDC dc; D=:04V}2+
dc.CreateDC("DISPLAY",NULL,NULL,NULL); ,+`61J3W
CBitmap bm; [."[pY
int Width=GetSystemMetrics(SM_CXSCREEN); x^Yl*iq
int Height=GetSystemMetrics(SM_CYSCREEN); ]yjl~3
bm.CreateCompatibleBitmap(&dc,Width,Height); KH\b_>wU2
CDC tdc; %WqNiF0-
tdc.CreateCompatibleDC(&dc); iAT)VQ&
CBitmap*pOld=tdc.SelectObject(&bm); #r
PP*
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); + OV')oE
tdc.SelectObject(pOld); tm7u^9]
BITMAP btm; Oj<S.fi
bm.GetBitmap(&btm); QwhRNnE=
DWORD size=btm.bmWidthBytes*btm.bmHeight; ARcv;H 5
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); )54%HM_$k
BITMAPINFOHEADER bih; vI$t+m:
bih.biBitCount=btm.bmBitsPixel; ?"?6,;F(4
bih.biClrImportant=0; Kwc6mlw~M
bih.biClrUsed=0; GGhM;%H_99
bih.biCompression=0; =^H4 Yck/5
bih.biHeight=btm.bmHeight; -hC,e/+
bih.biPlanes=1; iC
iZJ"
bih.biSize=sizeof(BITMAPINFOHEADER); }j,[ 1@S
bih.biSizeImage=size; g$dsd^{O7
bih.biWidth=btm.bmWidth; Z|RY2P>E
bih.biXPelsPerMeter=0; 52upoU>}2
bih.biYPelsPerMeter=0; ~=R SKyzt
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 8kP3+
static int filecount=0; iNwqF0
CString name; zhY+x<-
name.Format("pict%04d.bmp",filecount++); s1?[7yC
name=m_Path+name; `9k0Gd
BITMAPFILEHEADER bfh; ;[RZ0Uy=
bfh.bfReserved1=bfh.bfReserved2=0; r>GZ58i
bfh.bfType=((WORD)('M'<< 8)|'B'); qRbf2;
bfh.bfSize=54+size; !mXxAo
bfh.bfOffBits=54; ?eV4SH
CFile bf; j5@:a
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ lI>SUsQFfm
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); =_YG#yS
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); I(=V}s2
bf.WriteHuge(lpData,size); 1:Si,d,wh
bf.Close(); !x'/9^i~v
nCount++; )}9rwZ
} ?WE
GlobalFreePtr(lpData); BB|?1"neg
if(nCount==1) VY)s+Bx
m_Number.Format("%d picture captured.",nCount); ,^icPQSwc
else !nAX$i~
m_Number.Format("%d pictures captured.",nCount); eW|^tH
UpdateData(FALSE); r H ~" 4
} '=P7""mN5
LkQX?2>]
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) [
Bl c^C{f
{ y!]CJigpZ
if(pMsg -> message == WM_KEYDOWN) /PsnD_s]5
{ vX ] Gf4,
if(pMsg -> wParam == VK_ESCAPE) %c[ V
return TRUE; vzmc}y G
if(pMsg -> wParam == VK_RETURN) aM4k *|H?
return TRUE; /r_~:3F
} h,"4SSL
return CDialog::PreTranslateMessage(pMsg); 2k<;R':
} }%D^8>S
<oz!H[!
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 0?>dCu\
{ Zdn~`Q{
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ~Ch+5A;
SaveBmp(); 'fPdpnJ<
return FALSE; I[n^{8gz
} "+unS)M;Y
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ I"KN"v^
CMenu pop; E\C9|1)
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); YM
DMH"3
CMenu*pMenu=pop.GetSubMenu(0); >$ 2V%};
pMenu->SetDefaultItem(ID_EXITICON); Uo2GK3nT
CPoint pt; @}kv-*
GetCursorPos(&pt); ;,]P=Ey
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); + T8B:
if(id==ID_EXITICON) 2=_gf
DeleteIcon(); i E CrI3s
else if(id==ID_EXIT) Bp@v,)8*
OnCancel(); 1T[et-
return FALSE; im @h -A]0
} H9CS*|q6r
LRESULT res= CDialog::WindowProc(message, wParam, lParam); T*KMksjxm`
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ciMzf$+G$
AddIcon(); %AQIGBcgL
return res; zk( U8C+
} L5,NP5RC
Qf@
void CCaptureDlg::AddIcon() AFAAuFE"
{ 8(* [Fe9
NOTIFYICONDATA data; ~s5SZK*
data.cbSize=sizeof(NOTIFYICONDATA); |DsnNk0c
CString tip; <n#DT
tip.LoadString(IDS_ICONTIP); tToTxf~
data.hIcon=GetIcon(0); rdJR 2
data.hWnd=GetSafeHwnd(); |6<p(i7
strcpy(data.szTip,tip); ]9@F~)
data.uCallbackMessage=IDM_SHELL; ? YG)I;(
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ghRVso(
data.uID=98; e2A-;4?_
Shell_NotifyIcon(NIM_ADD,&data); rOVVL%@QqJ
ShowWindow(SW_HIDE); 53[~bwD
bTray=TRUE; 9yfJVg
} Q 7?#=N?
K1T4cUo
void CCaptureDlg::DeleteIcon() E@b(1@
{ 5s].
@C8
NOTIFYICONDATA data; |)*fRL,
data.cbSize=sizeof(NOTIFYICONDATA); )>Yu!8i
data.hWnd=GetSafeHwnd(); &Udb9
data.uID=98; 5^x1cUB]
Shell_NotifyIcon(NIM_DELETE,&data); p }~qf
ShowWindow(SW_SHOW); {lc\,F* $
SetForegroundWindow(); %ALwz[~]
ShowWindow(SW_SHOWNORMAL); >m$ 1+30X
bTray=FALSE; j{Q9{}<e
} % S os
v'3J.?N
void CCaptureDlg::OnChange() ruld B,n
{ $\U4hHOo
RegisterHotkey(); $A-J,_:T<
} #}y2)g
sc,vj'r
BOOL CCaptureDlg::RegisterHotkey() k1D@fiz
{ $F5 b
UpdateData(); U3dwI:cG
UCHAR mask=0; ]'=)2
.}
UCHAR key=0; e\:+uVzz
if(m_bControl) R)m'lMi|
mask|=4; m+T;O/lG0{
if(m_bAlt) V6,H}k
mask|=2; mUikA9u5=
if(m_bShift) K42K!8$
mask|=1; ?BZ PwGMs
key=Key_Table[m_Key.GetCurSel()]; ?m\t|/0Q
if(bRegistered){ }WH&iES@P
DeleteHotkey(GetSafeHwnd(),cKey,cMask); JAem0jPC8
bRegistered=FALSE; B e0ND2oo
} m()RU"WY
cMask=mask; !'9Feoez
cKey=key; b?lD(fa&
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); y1+*6|
return bRegistered; oV|4V:G q
} LAS'u"c|
4p,EBn9(
四、小结 f@|A[>"V
LoN< oj5
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。