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:
0\wi am-
^]7,1dH}M 一、实现方法
gLx/w\l6 |!xpYT: 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:
s ^3[W0hL RpAiU #pragma data_seg("shareddata")
%yvA HHOOK hHook =NULL; //钩子句柄
HT&p{7kFm UINT nHookCount =0; //挂接的程序数目
O4N-_Kfp/ static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
)7w@E$l" static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
.HCaXFW static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
> [8#hSk static int KeyCount =0;
eQ\jZ0s;p static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
*;P2+cE>H3 #pragma data_seg()
?rQc<;b Ge0Lb+<G 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。
pX^=be_ 0#
l#,Y6#I 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:
Ph
Ttx(! shNE~TA BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
KqK9X cKey,UCHAR cMask)
lZvS0JS {
gg(k7e BOOL bAdded=FALSE;
q-H&5K for(int index=0;index<MAX_KEY;index++){
yYk|YX(7U if(hCallWnd[index]==0){
.v\PilF hCallWnd[index]=hWnd;
C
rfRLsN] HotKey[index]=cKey;
[n!x&f8Xh HotKeyMask[index]=cMask;
#EFMgQO bAdded=TRUE;
4]IKh,jT KeyCount++;
)6 k1 P break;
Y!it!9 }
*V -ds8AQ }
!%V*UR9 return bAdded;
]Ly8s#<g]N }
~ttKI4 //删除热键
QheDF7'z BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
j)BQMtt&U {
s_v}=C^ BOOL bRemoved=FALSE;
VmYBa( for(int index=0;index<MAX_KEY;index++){
BJ2Q 2WW if(hCallWnd[index]==hWnd){
G\):2Qz!| if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
Z>&K&ttJ hCallWnd[index]=NULL;
4]]b1^vVj HotKey[index]=0;
{>A
8g({i HotKeyMask[index]=0;
Wkww&Y bRemoved=TRUE;
@~hz_Nm@8 KeyCount--;
x.o3iN[= break;
g&XhQ.aa }
BPqwDjW }
1MpX] j8C# }
'cYQ?; return bRemoved;
l%@dE7<Z }
}.OxJ=M 4V1|jy3 &%}bRPUl DLL中的钩子函数如下:
^h`!f vyH y6\ [1nZ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
UFos
E|r: {
OkkhP BOOL bProcessed=FALSE;
ThbP;CzI# if(HC_ACTION==nCode)
5"[yFmP* {
[1mIdwS if((lParam&0xc0000000)==0xc0000000){// 有键松开
A=W5W5l(> switch(wParam)
z}D#WWSxf {
W;91H'`?H case VK_MENU:
D)h["z|F MaskBits&=~ALTBIT;
9W$mDw6f break;
UUD\bWfn case VK_CONTROL:
FDl,Ey^r/ MaskBits&=~CTRLBIT;
Z5yt]-WN& break;
juR case VK_SHIFT:
q;IhLBl' MaskBits&=~SHIFTBIT;
9*f2b.Aj break;
6NU8HJp default: //judge the key and send message
eK\|SQb break;
gW/QFZjY }
a
pKa4nI
for(int index=0;index<MAX_KEY;index++){
%}\ vW if(hCallWnd[index]==NULL)
!'Gb$l! continue;
t7sUtmq
if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
_T_PX$B {
2lX[hFa5 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
kbD*=d}3{ bProcessed=TRUE;
2&suo!ig }
M^Q&A R'F }
u=1B^V,6V }
Z#srQD3].( else if((lParam&0xc000ffff)==1){ //有键按下
=ZFcxGo switch(wParam)
*;>V2!N=U {
Mr#oT? case VK_MENU:
yp( ?1 MaskBits|=ALTBIT;
sj#{TTW break;
YK(XS"Kl case VK_CONTROL:
S(@*3]!q MaskBits|=CTRLBIT;
Kc%tnVyGh: break;
eUzU]6h case VK_SHIFT:
v=dKcruR: MaskBits|=SHIFTBIT;
p_D
on3 break;
/h{go]&Nb default: //judge the key and send message
$71i+h]_ break;
]C9%]` }
MoC*tImWR for(int index=0;index<MAX_KEY;index++){
PR48~K,? if(hCallWnd[index]==NULL)
azz#@f1 continue;
#
|[`1 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
DQL06`pX/ {
p,M3#^ q SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
'vqj5YTj bProcessed=TRUE;
~YR <SV\{ }
@5<]W+jk4 }
k~'?"' }
P_:?}h\ if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
FZeN, for(int index=0;index<MAX_KEY;index++){
+?4*,8Tmmz if(hCallWnd[index]==NULL)
~v{C6) continue;
+ MOe{:/6 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
o|b[(t$;O SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
<lg"M;&Ht //lParam的意义可看MSDN中WM_KEYDOWN部分
9RCB$Ka6X }
]4LT# }
u&l>cJ' }
Bd N{[2 return CallNextHookEx( hHook, nCode, wParam, lParam );
0+VncL)u }
F3H:I"4 3:02`;3 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
p``;!3~~ -.+KCt G$+ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
B5?c'[V9 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
sqMNon`5 5VoOJ_hq 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:
yNb#Ia eNlF2M LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
cLN[o8ZU {
Qw{\sCH> if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
.SRuyioF& {
a|]%/[G@ //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
h[[/p {z SaveBmp();
%$9)1"T0Y return FALSE;
sJjl)Qs)T }
)N%1%bg^- …… //其它处理及默认处理
8KGv?^M
6W }
hK9t}NE.O uP%;QBb ]C!Y~ 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
X&FuqB ]y)R C-N 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
tc49Ty9$[ QB.*R? A 二、编程步骤
@88z{ 'nj&}A' 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";
4LB9w21 .$ P2W0G 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
Y/eN) {TxVRpiP{Z 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;
>w]k3MC R1b
) 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;
,$zSJzS -$]DO5fY 5、 添加代码,编译运行程序。
\aJ-q?= 2*7s9g 三、程序代码
/PB3^d>Q2 #K,qF* ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
65`'Upu #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
uX5--o=C #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
%\zCOfN #if _MSC_VER > 1000
Ow .)h(y/ #pragma once
L_zmU_zD #endif // _MSC_VER > 1000
'i h #ifndef __AFXWIN_H__
lWyP[>* #error include 'stdafx.h' before including this file for PCH
$X<<JnsK #endif
dc@wf;o #include "resource.h" // main symbols
by:xD25 class CHookApp : public CWinApp
|uBot#K| {
b]qfcV public:
Mbi+Vv- CHookApp();
^D>M Dj6 // Overrides
\qd)l // ClassWizard generated virtual function overrides
E.Q}
\E //{{AFX_VIRTUAL(CHookApp)
,%b1 ]zZQ public:
8IIdNd virtual BOOL InitInstance();
aXid;v, virtual int ExitInstance();
Kg0\Pvg8?T //}}AFX_VIRTUAL
7J!d3j2TR //{{AFX_MSG(CHookApp)
]!Aze^7; // NOTE - the ClassWizard will add and remove member functions here.
Y*X6lo // DO NOT EDIT what you see in these blocks of generated code !
o)'=D( //}}AFX_MSG
#O974f8 DECLARE_MESSAGE_MAP()
~\s &]L };
#uw*8&%0 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
[j+0EVwB BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
aFc'_FrQ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
Z
a
y'/b BOOL InitHotkey();
uKAHJ$% BOOL UnInit();
Ko1?jPE #endif
m4.V$U,H] Ywb)h^{! //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
?(L?X&)v #include "stdafx.h"
*Lk&@(
#include "hook.h"
n\)f.}YD8d #include <windowsx.h>
7X3l&J2C4l #ifdef _DEBUG
j9fL0$+FI #define new DEBUG_NEW
;8xn"G0}a #undef THIS_FILE
::b;4QL static char THIS_FILE[] = __FILE__;
F^v{ Jqc #endif
CvSG!l.6f< #define MAX_KEY 100
/(L1!BPP9m #define CTRLBIT 0x04
c+M@{EbuN #define ALTBIT 0x02
e&7}N Za #define SHIFTBIT 0x01
=,;3z/k% #pragma data_seg("shareddata")
(#Kvm HHOOK hHook =NULL;
xF>w r
r UINT nHookCount =0;
',ybHW%D%i static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
'eXw`kw( static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
.4)P=* static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
WW/m
/+ static int KeyCount =0;
IIEU{},}z static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
^?0,G>I%- #pragma data_seg()
^[NmNi* HINSTANCE hins;
Xg#([}b void VerifyWindow();
,<WykeC BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
L}pFb@ //{{AFX_MSG_MAP(CHookApp)
)8>f // NOTE - the ClassWizard will add and remove mapping macros here.
b#'a4j-u // DO NOT EDIT what you see in these blocks of generated code!
lGgKzi9VD //}}AFX_MSG_MAP
-~aEqj#? END_MESSAGE_MAP()
qq{N; C `d;izQ1_= CHookApp::CHookApp()
i 58CA? {
g2_df3Q // TODO: add construction code here,
JEkVj']? // Place all significant initialization in InitInstance
!@ '2 }
F!t13%yeu?
*zht(~% CHookApp theApp;
?uBC{KQ}Y LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
X~4:sJ\P= {
iR =aYT~ BOOL bProcessed=FALSE;
hfc!M2/w if(HC_ACTION==nCode)
k&;L(D {
daNIP1Qn if((lParam&0xc0000000)==0xc0000000){// Key up
w`_9 *AF9 switch(wParam)
' .<"jZ {
8TvPCZ$x case VK_MENU:
?P]md9$(+e MaskBits&=~ALTBIT;
aN3{\^ break;
q|2C>{8 case VK_CONTROL:
l.)!jWY MaskBits&=~CTRLBIT;
5X-(@GwN break;
Q;M\P/f case VK_SHIFT:
A*i_-;W) MaskBits&=~SHIFTBIT;
R>q'Y mu~ break;
ti%
e.p0[ default: //judge the key and send message
L
*@>/N break;
}y/t~f+ }
B9-=.2.WU for(int index=0;index<MAX_KEY;index++){
d(XWt;K K if(hCallWnd[index]==NULL)
_ji%BwJ continue;
V [>5 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
vX%gcs/@ {
M
XQ7%G SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
&YMj\KmlSg bProcessed=TRUE;
ii scm\ }
p}uw-$O }
&y+eE?j }
ma~`&\xE else if((lParam&0xc000ffff)==1){ //Key down
W&#Nk5d switch(wParam)
DK1)9< {
q[ZYlF,Ho case VK_MENU:
Az[z} r4 MaskBits|=ALTBIT;
)-oNy-YL break;
%Et]w case VK_CONTROL:
w@We,FUJN MaskBits|=CTRLBIT;
@pz2}Hd| break;
,sK-gw case VK_SHIFT:
?`$4ZDM MaskBits|=SHIFTBIT;
@<L.#gtP break;
gy.;
"W default: //judge the key and send message
E~ kmU{D break;
x1h!_^(QfF }
M\3!elp2z for(int index=0;index<MAX_KEY;index++)
Jt"Wtr {
"mA/:8` Q if(hCallWnd[index]==NULL)
2~ a4ib continue;
,*30Q if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
"( xu {
!Fi)-o SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
wSDDejg bProcessed=TRUE;
gqG"t@Y+ }
Cpl)byb }
dhbJ1/z^ }
6822xk if(!bProcessed){
(TPD!= for(int index=0;index<MAX_KEY;index++){
_+i-) if(hCallWnd[index]==NULL)
Uka4iya continue;
u CXd%
CzE if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
i2DR}%U SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
_>.%X45xi }
IftPN6(Z }
{#MViBhd% }
EifYK return CallNextHookEx( hHook, nCode, wParam, lParam );
$HRpG
}
2B#WWb +e\u4k {3V BOOL InitHotkey()
@47TDCr {
Kmtr.]Nj if(hHook!=NULL){
2mRso.Ah nHookCount++;
BLRrHaX0 return TRUE;
.|K5b]na }
$[d}g else
lWR hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
`&o|= if(hHook!=NULL)
Aq-v3$XL nHookCount++;
2
UgjH return (hHook!=NULL);
-M4#dHR_! }
z9gZ/d BOOL UnInit()
{VFpfo {
aaBBI S if(nHookCount>1){
uBM1;9h nHookCount--;
3jQ
|C= return TRUE;
)S]c'}^ }
rpvm].4 BOOL unhooked = UnhookWindowsHookEx(hHook);
+1rJ ;G if(unhooked==TRUE){
'{|87kI nHookCount=0;
TS-[p d hHook=NULL;
@`T6\ 1 }
2iUF%> return unhooked;
7M4iBk4I }
QRRZMdEGs[ te`4*t BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Lczcz"t {
tlW}lN} BOOL bAdded=FALSE;
V{8mx70 for(int index=0;index<MAX_KEY;index++){
vt1!|2{
h if(hCallWnd[index]==0){
$h2h&6mH hCallWnd[index]=hWnd;
u+]zi"k^s HotKey[index]=cKey;
aW"BN 5eM> HotKeyMask[index]=cMask;
f}fM%0/5 bAdded=TRUE;
% $J^dF_0 KeyCount++;
[P<oyd@# break;
se?nx7~ }
=lzjMRX(? }
,Rf<6 /A return bAdded;
vnKUD| }
\X(.%5xC [ [Z*n/tr BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
ZqSczS7uf {
7,:QFV BOOL bRemoved=FALSE;
oRCj]9I$ for(int index=0;index<MAX_KEY;index++){
LEY$St if(hCallWnd[index]==hWnd){
\=w|Zeu{l if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
OH&&d=~ hCallWnd[index]=NULL;
+] FdgmK: HotKey[index]=0;
qLcs)&}/A HotKeyMask[index]=0;
]":PO4M$* bRemoved=TRUE;
<FP&1Eg!| KeyCount--;
. }^m8PP break;
XXO
}
/W fpA\4S }
aC;OFINK }
|A"zxNeS" return bRemoved;
JVN0];IL} }
<_h P#iBwmwN+. void VerifyWindow()
X'O3)Yg {
mzDbw-# for(int i=0;i<MAX_KEY;i++){
V4_ZBeWA if(hCallWnd
!=NULL){ \\6/"
if(!IsWindow(hCallWnd)){ p?ICZg:
hCallWnd=NULL; G/b
$cO}
HotKey=0; ^`ny]3JA
HotKeyMask=0; 0ZTT^2R
KeyCount--; 7V?TLGgd$
} d7A vx
} bIR7g(PJ.b
} Y'0H2B8
} r"c<15g2'
CnN PziB
BOOL CHookApp::InitInstance() `i;f
{ |BN^5mqP6
AFX_MANAGE_STATE(AfxGetStaticModuleState()); BVU>M*k
hins=AfxGetInstanceHandle(); DYx3NDX7
InitHotkey(); 4~4D1
return CWinApp::InitInstance(); yHe%e1
} JZB7?@h%
zr2oU '+
int CHookApp::ExitInstance() |bDUekjR
{ IBZ_xU\2
VerifyWindow(); h_n`E7&bG
UnInit(); f<?v.5($
return CWinApp::ExitInstance(); @#rF8;
} {W,&jC
c <Fr^8
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file },+ &y^
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) _c,c;
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ k^K>*mcJ
#if _MSC_VER > 1000 l$
^LY)i
#pragma once HHzAmHt
#endif // _MSC_VER > 1000 B:;$5PUTc
MfNsor
class CCaptureDlg : public CDialog mQUI9
{ "n'kv!?\
// Construction UU'0WIbY6
public: n<3qr}ZG^
BOOL bTray; ip8%9fG\>
BOOL bRegistered; -c4g;;%
BOOL RegisterHotkey(); {9B"'65o
UCHAR cKey; kn%i#Fz
UCHAR cMask; 0i[v,eS
void DeleteIcon(); v(=?@tF}E
void AddIcon(); "lLwgh;
UINT nCount; jzvrJ14
void SaveBmp(); }l"pxp1K
CCaptureDlg(CWnd* pParent = NULL); // standard constructor sBm)D=Kll
// Dialog Data A1g.ww:
//{{AFX_DATA(CCaptureDlg) [3 D*DyQt
enum { IDD = IDD_CAPTURE_DIALOG }; _3%eIyk4T
CComboBox m_Key; V$0mcwH
BOOL m_bControl; !:baG]Y
BOOL m_bAlt; _59f.FsVR
BOOL m_bShift; #;D@`.#\
CString m_Path; z|bAZKSRYx
CString m_Number; 717S3knlv
//}}AFX_DATA k~Z;S QyN
// ClassWizard generated virtual function overrides )5Wt(p:T6_
//{{AFX_VIRTUAL(CCaptureDlg) X~g U$
public: /#}o19(-d
virtual BOOL PreTranslateMessage(MSG* pMsg); )s N}ClgJ
protected: P"[\p|[U
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support X{Ij30Bmv
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); InA=ty]"_U
//}}AFX_VIRTUAL L.2!Q3&
// Implementation *47HN7
protected: AcP d(Pc
HICON m_hIcon; twMDEw#VL
// Generated message map functions O!se-h5mW8
//{{AFX_MSG(CCaptureDlg) vN&(__3((
virtual BOOL OnInitDialog(); = IJ}b=:
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); S ^]mF>xX8
afx_msg void OnPaint(); AZ>F+@ d
afx_msg HCURSOR OnQueryDragIcon(); :Z%-&)F
virtual void OnCancel(); ?t)Mt]("
afx_msg void OnAbout(); p(>D5uN_}5
afx_msg void OnBrowse(); LEuDDJ-
afx_msg void OnChange(); "^Vnnb:Z*o
//}}AFX_MSG i^@hn>s$
DECLARE_MESSAGE_MAP() m$bYx~K
}; IY
hwFw
5O
#endif i&KBMx
o-<XR9,N*
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file %6\L^RP
#include "stdafx.h" 068DC_
#include "Capture.h" {4 {X`$
#include "CaptureDlg.h" "m>BE
#include <windowsx.h> v]\T&w%9
#pragma comment(lib,"hook.lib") Y0yu,
#ifdef _DEBUG v:"Y
#define new DEBUG_NEW vddl9"V)
#undef THIS_FILE Lb#PiTJI
static char THIS_FILE[] = __FILE__; =6a=`3r!I
#endif &o]fBdn
#define IDM_SHELL WM_USER+1 b#-=Dbe
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); lWDSF]ZYV
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); _6m{zvyX>
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ASB3|uy _
class CAboutDlg : public CDialog ):\+%v^
{ j-d542"
public: yU>ucuF
CAboutDlg(); 1HLU
&
// Dialog Data uS JLIb
//{{AFX_DATA(CAboutDlg) l{QlJ>%~{;
enum { IDD = IDD_ABOUTBOX }; /[5\T2GI
//}}AFX_DATA >>c%Ic
// ClassWizard generated virtual function overrides Ej $.x6:
//{{AFX_VIRTUAL(CAboutDlg) Gd`s01GKQ
protected: ydMhb367|
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support JQ|*XU
//}}AFX_VIRTUAL /IlO
// Implementation .l,]yWwfK
protected: F-XMy>9
//{{AFX_MSG(CAboutDlg) xt6%[)
//}}AFX_MSG #\ECQF
DECLARE_MESSAGE_MAP() K#Xl)h}y7
}; =3nA5'UZ
+i[@+`
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) W6RjQ1
{ '!`| H 3
//{{AFX_DATA_INIT(CAboutDlg) &UVqFo
//}}AFX_DATA_INIT _88X-~.
} fymmAfaR
:Dfl ,=S
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ]f5vk
{ .$1S-+(kV
CDialog::DoDataExchange(pDX); {P3gMv;
//{{AFX_DATA_MAP(CAboutDlg) !}5+hj!6
//}}AFX_DATA_MAP ~i.rk#{?D
} 2V~uPZ
,."wxP2u
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) (w`_{%T
//{{AFX_MSG_MAP(CAboutDlg) i6S["\h>
// No message handlers pU<GI@gU
//}}AFX_MSG_MAP b~{nS,_Rn
END_MESSAGE_MAP() 6\Tq,I7
'$VP\Gj.
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) t*fH&8(
: CDialog(CCaptureDlg::IDD, pParent) p&\DG
{ {].]`#4Jx
//{{AFX_DATA_INIT(CCaptureDlg) b>9?gmR{
m_bControl = FALSE; '3~m},0
m_bAlt = FALSE; .J=QWfqt
m_bShift = FALSE; F&C< = l\X
m_Path = _T("c:\\"); 1@}<CWE9
m_Number = _T("0 picture captured."); [;l;kom
nCount=0; 'Hgk$Im+
bRegistered=FALSE; =BbXSwv'(
bTray=FALSE; a/3yn9`sQ
//}}AFX_DATA_INIT hu7oJ H
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 :;IZ|hU
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); .krEfY&
} .yHK
99%R/m
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) f(\S+4
{ />uE)R$
CDialog::DoDataExchange(pDX); `=Rxnl,<U
//{{AFX_DATA_MAP(CCaptureDlg) 79D;0
DDX_Control(pDX, IDC_KEY, m_Key); roBbo
DDX_Check(pDX, IDC_CONTROL, m_bControl); ?T,a(m<i{
DDX_Check(pDX, IDC_ALT, m_bAlt); xgtx5tg
DDX_Check(pDX, IDC_SHIFT, m_bShift); N7GZ'-t^Er
DDX_Text(pDX, IDC_PATH, m_Path); 5g;mc.Cvt
DDX_Text(pDX, IDC_NUMBER, m_Number); Pa=xc>m^
//}}AFX_DATA_MAP A<(Fn_&W
} K,+z^{Hvh
mnw(x#%P
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) X_)I"`
//{{AFX_MSG_MAP(CCaptureDlg) }*!_M3O
ON_WM_SYSCOMMAND() Hq&MePl[
ON_WM_PAINT() VMS3Q)Ul
ON_WM_QUERYDRAGICON() o#D'"Tn!
ON_BN_CLICKED(ID_ABOUT, OnAbout) @RCZ![XYWg
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) "*TP@X?@f
ON_BN_CLICKED(ID_CHANGE, OnChange) 1c*:"
k
//}}AFX_MSG_MAP O7od2fV(i7
END_MESSAGE_MAP() '5A&c(
uTdz$Nh
BOOL CCaptureDlg::OnInitDialog() x]608I
T
{ P%d3fFzK
CDialog::OnInitDialog(); aU$8 0
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 9lkl-b6xG
ASSERT(IDM_ABOUTBOX < 0xF000); [<}W S}
.
CMenu* pSysMenu = GetSystemMenu(FALSE); dZddoz_
if (pSysMenu != NULL) };'~@%U]/
{ }h|HT
CString strAboutMenu; aU#r`D@0
strAboutMenu.LoadString(IDS_ABOUTBOX); tiRi_
if (!strAboutMenu.IsEmpty()) Wd7qpWItjQ
{ j9}.U \
pSysMenu->AppendMenu(MF_SEPARATOR); :3b\ pEO9\
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); /N")uuv
} !G<gp4Js+N
} 9U@>&3[v
SetIcon(m_hIcon, TRUE); // Set big icon 5!57<n
SetIcon(m_hIcon, FALSE); // Set small icon j#l1KO^y
m_Key.SetCurSel(0); Y$fF"pG?
RegisterHotkey(); jS|jPk|I.
CMenu* pMenu=GetSystemMenu(FALSE); l{\k\Q !4
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); -AQ
7Bd
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); =`!#V/=
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); n8q%>.i7
return TRUE; // return TRUE unless you set the focus to a control `2j"Z.=
}
=A_{U(>
<AHdz/N
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ,8DjQz0ZPo
{ ;Wn0-`_1,
if ((nID & 0xFFF0) == IDM_ABOUTBOX) ~!e(e2
{ Zlv`yC*r
CAboutDlg dlgAbout; GwG(?_I"
dlgAbout.DoModal(); w-Q=oEt
} TUQe.oAi
else ("=B,%F_
{ JycC\s+%E
CDialog::OnSysCommand(nID, lParam); g{hbq[>X]
} &hWYw+yH\
} kcP&''
Slp_o\s$@
void CCaptureDlg::OnPaint() NRs%q}lX
{ {y<E_y
x1
if (IsIconic()) b\xse2#
{ ^>s{o5H&
CPaintDC dc(this); // device context for painting j^Ln\N]^
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); |e2s{J2
// Center icon in client rectangle ALKzR433/
int cxIcon = GetSystemMetrics(SM_CXICON); wy""02j
int cyIcon = GetSystemMetrics(SM_CYICON); V)mi1H|m
CRect rect; :eSwXDy&
GetClientRect(&rect); ~b9fk)z!
int x = (rect.Width() - cxIcon + 1) / 2; raZ0B,;eFu
int y = (rect.Height() - cyIcon + 1) / 2; &Z+.FTo
// Draw the icon ?cD_\~
dc.DrawIcon(x, y, m_hIcon); [t]q#+Zs
} ?Lr:>
else V|;os
{ )u307Lg
CDialog::OnPaint(); lR^W*w4y
} XE;aJ'kt
} w)}@svv"
Bs<LJzS{V
HCURSOR CCaptureDlg::OnQueryDragIcon() 9YwS"~Q =w
{ z|zd=3c
return (HCURSOR) m_hIcon; Kxsj_^&|i
} U5j0i]
v3]~*\!5
void CCaptureDlg::OnCancel() (FOJHjtkM
{ P}D5 j
if(bTray) a&gf0g;@I
DeleteIcon(); zi,":KDz#
CDialog::OnCancel(); wKy4Ic+RV
} <}AmzeHr+
.u;'eVH)a}
void CCaptureDlg::OnAbout() 62>/0_m5
{ 7 '7a`-W
CAboutDlg dlg; kk/vgte-)e
dlg.DoModal(); TK#-;p_
} w%f51Ex
21\?FQrz
void CCaptureDlg::OnBrowse() fq0[7Yb
{ $+HS^m
CString str; 3$kElq[
BROWSEINFO bi; s9Bd mD^|#
char name[MAX_PATH]; [,mcvO;
ZeroMemory(&bi,sizeof(BROWSEINFO)); ,CnUQx0
bi.hwndOwner=GetSafeHwnd(); ]w9syz8X
bi.pszDisplayName=name; %l)~C%T
bi.lpszTitle="Select folder"; jp-]];:aPJ
bi.ulFlags=BIF_RETURNONLYFSDIRS; zKaEh
LPITEMIDLIST idl=SHBrowseForFolder(&bi); K#plSD^f=
if(idl==NULL) Py#iC#g~
return; QEl~uhc3
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ]\:l><
str.ReleaseBuffer(); ,NQ>,}a0
m_Path=str; ,
-S n
if(str.GetAt(str.GetLength()-1)!='\\') /4u:5G
m_Path+="\\"; XBHv V05mv
UpdateData(FALSE); AmT*{Fz8
} +@K8:}lOW
Px"K5c*
void CCaptureDlg::SaveBmp() =v/x&,Uj@6
{ Hxd^oE
CDC dc; 74*iF'f?c
dc.CreateDC("DISPLAY",NULL,NULL,NULL); .@]M'S^1
CBitmap bm; ak;S Ie
int Width=GetSystemMetrics(SM_CXSCREEN); DR#[\RzNI
int Height=GetSystemMetrics(SM_CYSCREEN); 6c&OR2HGqO
bm.CreateCompatibleBitmap(&dc,Width,Height); %q,^A+=
CDC tdc; q"pnFK9/L
tdc.CreateCompatibleDC(&dc); WnC0T5S?U
CBitmap*pOld=tdc.SelectObject(&bm); MFLw^10(T
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); bLyG3~P;0
tdc.SelectObject(pOld); {1`n^j(>
BITMAP btm; <(-4?"1
bm.GetBitmap(&btm); G6x 2!Ny
DWORD size=btm.bmWidthBytes*btm.bmHeight; >@U
lhJtW
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 98eS f
BITMAPINFOHEADER bih;
T89VSB~
bih.biBitCount=btm.bmBitsPixel; EM.rO/qcW
bih.biClrImportant=0; pGGx.&5#82
bih.biClrUsed=0; 9CTvG zkw
bih.biCompression=0; z?8Sie
bih.biHeight=btm.bmHeight; 4Vi&Y')f
bih.biPlanes=1; ?YbZVoD)J
bih.biSize=sizeof(BITMAPINFOHEADER); Dbo.N`
bih.biSizeImage=size; 1
+'HKT}
bih.biWidth=btm.bmWidth; r#[YBaCZJ
bih.biXPelsPerMeter=0; ;F<)BEXC<
bih.biYPelsPerMeter=0; E={W^k!Vz:
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); #`H^8/!e
static int filecount=0; 2nPU $\du
CString name; L)ry!BuHI
name.Format("pict%04d.bmp",filecount++); $R<eXDW6:
name=m_Path+name; SbW6O_
BITMAPFILEHEADER bfh; +C !A@
bfh.bfReserved1=bfh.bfReserved2=0; sIJ37;ZA
bfh.bfType=((WORD)('M'<< 8)|'B'); @*c) s_
bfh.bfSize=54+size; +2ih!$T;7>
bfh.bfOffBits=54; -m~[z
CFile bf; O}3M+
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ &j7l#Urq
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ,FPgbs
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); $0zH2W
bf.WriteHuge(lpData,size); D:HeP:.I
bf.Close(); lFY;O !Y5\
nCount++; <!vAqqljt
} ]X)EO49
GlobalFreePtr(lpData); %j=,c{`Q
if(nCount==1) lA<IcW
m_Number.Format("%d picture captured.",nCount); U)p P^:|
else o;JBe"1
m_Number.Format("%d pictures captured.",nCount); i4"xvLK4
UpdateData(FALSE); u[oYVpe)IG
} ~>)GW
Q=9S?p
M
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) VMW?[j
{ "t"=9:_t
if(pMsg -> message == WM_KEYDOWN) QE5
85s5
{ ";e0-t6:
if(pMsg -> wParam == VK_ESCAPE) 6P;1I+5m{q
return TRUE; <_H0Q_/(
if(pMsg -> wParam == VK_RETURN) !`='K
+
return TRUE; ~4*9w3t
} w|PZSOJ
return CDialog::PreTranslateMessage(pMsg); H2RNekck
} [:!#F7O-
y\@;s?QL
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) fK^FD&sF
{ (.!q~G
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Y^S0K'N
SaveBmp(); j&Ayk*
return FALSE; a(8]y.`Tv
} j>R7OGg'
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ sa+:c{
CMenu pop; 2#1FI0,Pa*
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); qTyU1RU$9^
CMenu*pMenu=pop.GetSubMenu(0); ,lA J{5\#
pMenu->SetDefaultItem(ID_EXITICON); fC%;|V'Nd
CPoint pt;
VV]{R'
GetCursorPos(&pt); XW]|Mv[M
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); =GM!M@~,Ab
if(id==ID_EXITICON) Ed*`d>
DeleteIcon(); N M~e
else if(id==ID_EXIT) =4 JVUu~Z
OnCancel(); p|Rxy"}
return FALSE; <k^9l6@
} 9i|6
LRESULT res= CDialog::WindowProc(message, wParam, lParam); o
ohf))
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 2#W%--
AddIcon(); pdnL~sv
return res; >Q5E0 !]
} Z*]n]eS
9R;s;2$.
void CCaptureDlg::AddIcon() YBS]JCO
{ u{p\8v%7
NOTIFYICONDATA data; xI:;%5{LN
data.cbSize=sizeof(NOTIFYICONDATA); "
31C8
CString tip; @1Zf&'/6
tip.LoadString(IDS_ICONTIP); _9
Gy`
data.hIcon=GetIcon(0); l]v
*h0!
data.hWnd=GetSafeHwnd(); }.b[a z\T
strcpy(data.szTip,tip); RXx
+rdF0
data.uCallbackMessage=IDM_SHELL; (uV7N7 <1
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; "F[VqqD
data.uID=98; @fE^w^K7
Shell_NotifyIcon(NIM_ADD,&data); dEe/\i'r9
ShowWindow(SW_HIDE); =h_4TpDQ
bTray=TRUE; w@%W{aUC
} Z p__
A<.Q&4jb
void CCaptureDlg::DeleteIcon() 06Hn:IT18
{ 9I.v?Tap
NOTIFYICONDATA data; Bxa],inuZ
data.cbSize=sizeof(NOTIFYICONDATA); 1@nR.v"$
data.hWnd=GetSafeHwnd(); G0]n4"~+?
data.uID=98; Z(}x7j zW
Shell_NotifyIcon(NIM_DELETE,&data); g:o\ r
(
ShowWindow(SW_SHOW); 1
yzxA(
SetForegroundWindow(); Bnxzy
n
ShowWindow(SW_SHOWNORMAL); aF;TsB
bTray=FALSE; l5h9Eq
} BklB3*n
2bxT%xH:g
void CCaptureDlg::OnChange() wyc,Ir
{ f`IgfJN
RegisterHotkey(); 2Qy!Aa
} quKD\hL$
} 1XLe
BOOL CCaptureDlg::RegisterHotkey() 5r+0^UAO:J
{ 3x=F
UpdateData(); I Mv^ 9T:
UCHAR mask=0; YwF6/JA0^
UCHAR key=0; Q[b({Vj;tG
if(m_bControl) @Op8^8$`
mask|=4; 0zTv'L
if(m_bAlt) pJv?
mask|=2; c^6`"\X^g
if(m_bShift) \YKh'|04
mask|=1; _L=vK=,
key=Key_Table[m_Key.GetCurSel()]; AngECkF-
if(bRegistered){
yCkm|
DeleteHotkey(GetSafeHwnd(),cKey,cMask); V!opnLatYS
bRegistered=FALSE; eN-{
} ZK
?x_`w
cMask=mask; ~NcJLU!au
cKey=key; oOL3O@)w>
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); xBZ9|2Y s
return bRegistered; sTA/2d
} !:n),sFv45
&=?`;K
四、小结 C5WCRg5&
__V]HcP;
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。