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:
y^hCO:`l3
JWvL 一、实现方法
{:c5/
,7c; BBlYy5x 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:
ppK`7J>Z v<tr1cUT #pragma data_seg("shareddata")
jk fc=O6^ HHOOK hHook =NULL; //钩子句柄
RD0=\!w *5 UINT nHookCount =0; //挂接的程序数目
8(""ui8 static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
pt=H?{06 static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
]}0QrD static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
&Z6s\r% static int KeyCount =0;
tkKiuh?m static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
C0 %yGLh& #pragma data_seg()
SK;c
D>) o==:e 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。
p5\B0G<m @pO2A6Ks 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:
4|Ay;}X \ I7e.pm BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
.FpeVjR'' cKey,UCHAR cMask)
?I332,,q {
T43Jgk, BOOL bAdded=FALSE;
6_kv~`"t Z for(int index=0;index<MAX_KEY;index++){
z6;6 o!ej if(hCallWnd[index]==0){
B6xM#) hCallWnd[index]=hWnd;
oZ,_ G,b^ HotKey[index]=cKey;
#l#8-m8g) HotKeyMask[index]=cMask;
JBt2R= bAdded=TRUE;
$bsD'Io KeyCount++;
ME.a * v break;
fv/Nf" }
qvG@kuz8g5 }
4Be'w`Q { return bAdded;
`R6dnbH }
R]<N";- //删除热键
jiqE^j3; BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
! N'HL-oT {
|Q?^B a BOOL bRemoved=FALSE;
XDohfa_ for(int index=0;index<MAX_KEY;index++){
}ej>uZVe< if(hCallWnd[index]==hWnd){
&hu>yH>j if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
~kFL[Asnaf hCallWnd[index]=NULL;
!\5w<*p8 HotKey[index]=0;
liU8OXBl HotKeyMask[index]=0;
&OsO _F bRemoved=TRUE;
<sli!rv KeyCount--;
F(KsB5OY? break;
w?:tce }
@A'@%Zv- }
M`)/^S9 }
T7~H|% return bRemoved;
@L?KcGD }
7BkY0_KK RG_.0'5=hc B-UsMO DLL中的钩子函数如下:
WT63ve a(uZ}yS$ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
5yk#(i7C {
zd|n!3; BOOL bProcessed=FALSE;
5y8VA4L/o if(HC_ACTION==nCode)
c*.-mS~Z` {
@L$!hTaP if((lParam&0xc0000000)==0xc0000000){// 有键松开
yQ0:M/r;0 switch(wParam)
G&
m~W {
je85G`{DC case VK_MENU:
s>*xAIx
MaskBits&=~ALTBIT;
5Ky(C6E$s break;
* o{7 a$V case VK_CONTROL:
/]oQqZHv MaskBits&=~CTRLBIT;
O',Vce$ break;
LyH1tF case VK_SHIFT:
!|Wf
mU MaskBits&=~SHIFTBIT;
%2y5a`b break;
KX
J7\} default: //judge the key and send message
2F
:8=_sA break;
gCq'#G\Z }
'^)}"sZ@G for(int index=0;index<MAX_KEY;index++){
o$Ju\(Y$<+ if(hCallWnd[index]==NULL)
^B:;uyG]M continue;
G>Hg0u0!, if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
YD;G+"n?T {
g%<n9AUl SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
YPW
UncV bProcessed=TRUE;
X|-[i hp; }
m?kyAW'| }
yzT4D>1, }
k%BU&%?1 else if((lParam&0xc000ffff)==1){ //有键按下
)k;;O7Ck switch(wParam)
Ec2;?pvd%J {
c?N,Cd~q case VK_MENU:
V';l H2 MaskBits|=ALTBIT;
|]?zH~L break;
@{W"mc+ case VK_CONTROL:
.cbC2t95 MaskBits|=CTRLBIT;
Evd|_ W- break;
Q8MIpa!: case VK_SHIFT:
)+R n[MMp MaskBits|=SHIFTBIT;
Uo71C 4ev break;
hJsP;y:@Lm default: //judge the key and send message
,J8n}7aI break;
=3 Vug2*wd }
YZ`SF"Bd( for(int index=0;index<MAX_KEY;index++){
tj$[szo if(hCallWnd[index]==NULL)
s&Y"a,|Z continue;
kg
8Dn if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
BM'!odRv {
2?SbkU/3|P SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
'NZ=DSGIy bProcessed=TRUE;
+:"0%( }
J>5 rkR@/ }
G bclR:G }
S'5Zy}
+x if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
%IZd-N7i^ for(int index=0;index<MAX_KEY;index++){
uKXNzz if(hCallWnd[index]==NULL)
nwh @F1| continue;
^sB0$|DU if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
3H`{
A/r SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
vENf3;o0 //lParam的意义可看MSDN中WM_KEYDOWN部分
mf)+ 5On }
pQK SPr }
QW$p{ zo }
l<BV{Gl return CallNextHookEx( hHook, nCode, wParam, lParam );
VX&PkGi?o }
),-gy~ )Qd
x 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:
ddyX+.LMk PO?_i>mA BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
r5Tdp)S BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
A4cOnG,
HA*L*:0 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:
,T`,OZm y?3.W LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
,|B-Nq {
H#DvCw if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
8'HS$J;C {
{eV8h}KIl //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
`/ayg:WSU SaveBmp();
P/girce0 return FALSE;
hd u2?v@ }
8M@'A5] …… //其它处理及默认处理
[d8Q AO1;) }
tw>2<zmSi% {X&lgj p*&0d@'r 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
?UZt30|1
dw3Hk$"h 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。
(rd
[tc Ca
PHF@6WN 二、编程步骤
weSq|f kB> ~Tb0 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";
IF|6iKCE yjg&/6 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
6FQi=}O 1 *Bq}.Yn 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;
s:Ml\['x +7^p d9F. 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;
1J4Pnl+hN -(8I ?{"4i 5、 添加代码,编译运行程序。
jk{(o09 %)x9u$4W2 三、程序代码
sfj+-se(K. DzQBWY]
) ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
/N"3kK,N #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
UnF8#~ #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
"(^XZAU#W #if _MSC_VER > 1000
(Z
SaAn), #pragma once
"|L"C+tE #endif // _MSC_VER > 1000
DS<1"4 b| #ifndef __AFXWIN_H__
K"H\gmV_g #error include 'stdafx.h' before including this file for PCH
);\c{QF #endif
AQlB_@ b #include "resource.h" // main symbols
&(rWl`eTY` class CHookApp : public CWinApp
i(^U<DW$ {
{P]C> public:
W(`QbNJ CHookApp();
#_@cI(P // Overrides
S3E,0%yo+) // ClassWizard generated virtual function overrides
xi=ApwNj //{{AFX_VIRTUAL(CHookApp)
lUm(iYv;H public:
~,b^f{7`! virtual BOOL InitInstance();
t?W}=%M[ virtual int ExitInstance();
{`QHg O //}}AFX_VIRTUAL
X#lNS+&=' //{{AFX_MSG(CHookApp)
P5h|* ?= // NOTE - the ClassWizard will add and remove member functions here.
d9#Vq=H / // DO NOT EDIT what you see in these blocks of generated code !
xzm]v9k& //}}AFX_MSG
z%%O-1 DECLARE_MESSAGE_MAP()
W]9*dabem };
ff\~`n~WZ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
hm`=wceK BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
4VWk/HK-! BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
LH8jT BOOL InitHotkey();
RZm%4_p4s BOOL UnInit();
[@vz0!@s5 #endif
NQk aW) GiV%Hcx //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
zTF{ g+ #include "stdafx.h"
O?JJE8~'] #include "hook.h"
=|S%Rzsk #include <windowsx.h>
3/kT'r #ifdef _DEBUG
}}JMwT
#define new DEBUG_NEW
=?<WCR
C* #undef THIS_FILE
`Vb static char THIS_FILE[] = __FILE__;
]:<!( #endif
h[ DNhR #define MAX_KEY 100
T{k
P9
4 #define CTRLBIT 0x04
<v:VA!] #define ALTBIT 0x02
5ilGWkb`'X #define SHIFTBIT 0x01
N+|NI?R?} #pragma data_seg("shareddata")
GM%+yS}(P HHOOK hHook =NULL;
}02`ve* UINT nHookCount =0;
1F^Q* t{ static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
9-KhJq% static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
}}AIpYp,P static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
,c p2Fac static int KeyCount =0;
FzT.9Vz7 static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
U(#<D7} #pragma data_seg()
{ez$kz HINSTANCE hins;
t4WB^dHYp void VerifyWindow();
5p;AON BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
'o>)E> //{{AFX_MSG_MAP(CHookApp)
K}~$h,n // NOTE - the ClassWizard will add and remove mapping macros here.
zX>W 8P // DO NOT EDIT what you see in these blocks of generated code!
>lQo _p(; //}}AFX_MSG_MAP
1-KNXGb' END_MESSAGE_MAP()
KA5)]UF`l gg'1q3OjM CHookApp::CHookApp()
~VGnE: {
zfIo]M` // TODO: add construction code here,
yn4T!r " // Place all significant initialization in InitInstance
xM*_1+<dT$ }
B$4*U"tk 3S0.sU~_U CHookApp theApp;
U0~_'&Fe LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
?+yr7_f3* {
.DCHc,DxA BOOL bProcessed=FALSE;
0#,a#P if(HC_ACTION==nCode)
8Bf> {
3Vb4zZsl if((lParam&0xc0000000)==0xc0000000){// Key up
> H!sD\b switch(wParam)
b_0THy.Z {
Xz+%Ym case VK_MENU:
*o6}>; MaskBits&=~ALTBIT;
bx0.(Nv/X break;
u6qK4*eAD case VK_CONTROL:
]?eZDf~ MaskBits&=~CTRLBIT;
q2qi~}l break;
6j<9Y case VK_SHIFT:
M tN>5k c MaskBits&=~SHIFTBIT;
CVj^{||eF break;
$~/2!T_ default: //judge the key and send message
RJrz ~,} break;
SK<Rk }
n
~t{]if" for(int index=0;index<MAX_KEY;index++){
qpjY &3SI if(hCallWnd[index]==NULL)
1Ms[$$b$ continue;
*LT~:Gs# if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
_5oTNL2 {
F^i3e31*t SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
Wv;0PhF bProcessed=TRUE;
sZ.<:mu[ }
(m~>W"x/ }
=
tv70d' }
D tsZP
( else if((lParam&0xc000ffff)==1){ //Key down
I= mz^c{ switch(wParam)
M&Uy42,MR {
/x<g$!`X case VK_MENU:
mxa~JAlN_ MaskBits|=ALTBIT;
]-=L7a break;
|.<_$[v[x case VK_CONTROL:
mzgt>Qtkz= MaskBits|=CTRLBIT;
H?$dnwR break;
xEb>6+-F@ case VK_SHIFT:
#8$?#
dT MaskBits|=SHIFTBIT;
Y"Cf84E break;
@=-(H<0 default: //judge the key and send message
P"YdB|I break;
YW}$e W* }
x.Sf B[SZ for(int index=0;index<MAX_KEY;index++)
i'>6Qo {
zp:dArh0 if(hCallWnd[index]==NULL)
=Tj{)=^/# continue;
&,X}M if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
mG~_*8}e< {
("$/sT SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
`MtzA^X r bProcessed=TRUE;
8fC4j`! }
OgQdyU }
]?9*Vr:P^ }
e~r/!B5X if(!bProcessed){
XJ18(Q|w' for(int index=0;index<MAX_KEY;index++){
K$"#SZEi if(hCallWnd[index]==NULL)
Ayz*2N`% continue;
> I2rj2M# if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
S|85g1}t SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
*t@A-Sn }
T(J'p4 }
Q@D7\<t }
EX8JlA\-W return CallNextHookEx( hHook, nCode, wParam, lParam );
?=u?u
k<- }
)M0YX?5AR r`H}f#.KR BOOL InitHotkey()
#M,&g{ {
inh0p^ if(hHook!=NULL){
p{f R$-d nHookCount++;
HJL! ;i return TRUE;
,OE&e*1 }
tKbxC>w else
/cjz=r1U> hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
P/%7kD@5; if(hHook!=NULL)
1\}vU nHookCount++;
FO!Td return (hHook!=NULL);
A*JOp8\) }
/{T&l*' BOOL UnInit()
iaGA9l<b {
j=WxtMS if(nHookCount>1){
coP->&(@U# nHookCount--;
+m=b
"g return TRUE;
%(CC }
f56yI]*N=< BOOL unhooked = UnhookWindowsHookEx(hHook);
$?= $F if(unhooked==TRUE){
^q7V%{54 nHookCount=0;
~_ THvx1 hHook=NULL;
byHc0ktI\ }
i3-5~@M return unhooked;
2)}n"ibbT }
MxTJgY ]OAU&t{ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Z@~gN5@,M {
Kb~nC6yJc BOOL bAdded=FALSE;
_4{0He`q for(int index=0;index<MAX_KEY;index++){
73Dxf - if(hCallWnd[index]==0){
uGU2 hCallWnd[index]=hWnd;
0.MB;gm: HotKey[index]=cKey;
<)qa{,GX\ HotKeyMask[index]=cMask;
K#3^GB3P bAdded=TRUE;
:1' KeyCount++;
L+t
/
E` break;
]U?nYppV }
}$ y.qqG }
G[64qhTC return bAdded;
pPReo) }
~q>jXi :;$MUOps BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
2&6D`{"P {
TTf
j5 BOOL bRemoved=FALSE;
NdK`-RT for(int index=0;index<MAX_KEY;index++){
(,At5T if(hCallWnd[index]==hWnd){
w,%"+tY_ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
,NO[Piok hCallWnd[index]=NULL;
c`E>7Hjr- HotKey[index]=0;
0h-NT\m HotKeyMask[index]=0;
gtKih bRemoved=TRUE;
D*l(p5[ KeyCount--;
y?sz&*: break;
dXyMRGRUq }
2&hv6Y1 }
R
iZ)FW }
GT6; I7 return bRemoved;
j{C~wy!J }
>+O0W)g{o '}cSBbl&/n void VerifyWindow()
:ez76oGyc {
3.Fko<D4jD for(int i=0;i<MAX_KEY;i++){
Th_@'UDa if(hCallWnd
!=NULL){ Agd"m4!
if(!IsWindow(hCallWnd)){ <bcf"0A
hCallWnd=NULL; lMv6QL\>'
HotKey=0; \VPw3
HotKeyMask=0; "8QRYV~Z
KeyCount--; =!Ik5LiD
} {i>AQ+z61f
} wgz]R
} *q}yfa35eR
} ydWr&E5
GRc)3
2,
BOOL CHookApp::InitInstance() L15)+^4n
{ s}zR@ !`
AFX_MANAGE_STATE(AfxGetStaticModuleState()); |
BaEv\$K
hins=AfxGetInstanceHandle(); yY]x''K
InitHotkey(); &dB@n15'A
return CWinApp::InitInstance(); lDS y$
} LWr YKi
("`"?G
int CHookApp::ExitInstance() d=1\= d/K
{ =svFw&q"
VerifyWindow(); JMAdsg/
UnInit(); Csyh
'v
return CWinApp::ExitInstance(); 6;E3|st1X
} ,Uh^e]pC
+9/K|SB{$
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file l!1_~!{y
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 6AIqoX*p
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ y[J9"k(@
#if _MSC_VER > 1000 XT/t\\Z`U
#pragma once lhM5a
\
#endif // _MSC_VER > 1000 S @[]znH
%
J\G[dl
class CCaptureDlg : public CDialog W@!qp
{ UVDMYA0
// Construction + 149 o2
public: 8Hq4ppC
BOOL bTray; ?;#Q3Y+
BOOL bRegistered; !\ b-Ot(
BOOL RegisterHotkey(); 2K4Xu9-i:b
UCHAR cKey; =2q#- ,t
UCHAR cMask; m{oe|UVcmr
void DeleteIcon(); auI`'O`/
void AddIcon(); iKq_s5|sW
UINT nCount; }a OBQsnO
void SaveBmp(); r?KRK?I
CCaptureDlg(CWnd* pParent = NULL); // standard constructor 8B ,S_0!
// Dialog Data uV|F3'jT
//{{AFX_DATA(CCaptureDlg) j6s j 2D
enum { IDD = IDD_CAPTURE_DIALOG }; x,: k/]
CComboBox m_Key; H2iIBGu|L
BOOL m_bControl; U_jW5mgsG
BOOL m_bAlt; tOXyle~C
BOOL m_bShift; e@c8Ce|0
CString m_Path; !- [ZQ
CString m_Number; lP=,|xFra
//}}AFX_DATA ;nl JD#
// ClassWizard generated virtual function overrides xM{[~Kh_x
//{{AFX_VIRTUAL(CCaptureDlg) '7' 73
public: <Z[Z&^
virtual BOOL PreTranslateMessage(MSG* pMsg); SN|!FW.*:
protected: C;ab-gh
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support -qpvVLR,
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); H M(X8iNt
//}}AFX_VIRTUAL hxdjmc-
// Implementation kM-8%a2i
protected: vEjf|-Mb9
HICON m_hIcon; )4o8SF7lz
// Generated message map functions ;\"5)S
//{{AFX_MSG(CCaptureDlg) 5%wA"_
virtual BOOL OnInitDialog(); 9t`yv@.>N
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ty[%:eG#
afx_msg void OnPaint(); Ud"_[JtGM
afx_msg HCURSOR OnQueryDragIcon(); <|'ETqP<+
virtual void OnCancel(); ,or;8aYc#
afx_msg void OnAbout(); [-`s`g-
afx_msg void OnBrowse(); (4z_2a(Dl,
afx_msg void OnChange(); =f@71D1
//}}AFX_MSG 2cu2S"r
DECLARE_MESSAGE_MAP() =H: N!!:
}; Obu 6k[BE.
#endif =2*2$
_e8Gt6>
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file nUs=PD3)
#include "stdafx.h"
6x5Q*^w
#include "Capture.h" BZOl&G(
#include "CaptureDlg.h" },<Y
\
#include <windowsx.h> l_((3e[)
#pragma comment(lib,"hook.lib") Vh01y f
#ifdef _DEBUG W rT_7
#define new DEBUG_NEW alxIc.[
#undef THIS_FILE '"q+[zwv
static char THIS_FILE[] = __FILE__; Li8/GoJW-T
#endif fx:vhEX
#define IDM_SHELL WM_USER+1 U4Zx1ieCKH
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); HI1|~hOb'
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); /g0' +DP
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; %X}D(_
class CAboutDlg : public CDialog XiV*d06{
{ J*ofa>
public: lX.1B&T9Lr
CAboutDlg(); |-v/
// Dialog Data UU}Hs}
//{{AFX_DATA(CAboutDlg) A?-t`J
enum { IDD = IDD_ABOUTBOX }; /: -ig .YY
//}}AFX_DATA AN,3[Sh
// ClassWizard generated virtual function overrides s!W{ru
//{{AFX_VIRTUAL(CAboutDlg) {y|.y~vW
protected: f% 8n?f3;u
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Dd
OK&
//}}AFX_VIRTUAL J;V#a=I
// Implementation \{(cz/]G/
protected: ^tyqc8&
//{{AFX_MSG(CAboutDlg) H[R6 ?H@$F
//}}AFX_MSG dtQ3iuV %
DECLARE_MESSAGE_MAP() 'e>'JZR
}; )MV `'i
79Aa~ +i'_
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Oo!]{[}7
{ kQ[23
//{{AFX_DATA_INIT(CAboutDlg) \HMuVg'Q
//}}AFX_DATA_INIT #cikpHLXG
} .K_50%s
+pv..\
void CAboutDlg::DoDataExchange(CDataExchange* pDX) #BEXj<m+J
{ G=Xas"|
CDialog::DoDataExchange(pDX); Nog{w
//{{AFX_DATA_MAP(CAboutDlg) <e|B7<.
//}}AFX_DATA_MAP .F/l$4CQ
} wlwgYAD
On;7
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) L>`inrpz=w
//{{AFX_MSG_MAP(CAboutDlg) AB.ZmR9|
// No message handlers [xDn=)`{V
//}}AFX_MSG_MAP C61E=$
END_MESSAGE_MAP() oJc v D
Jk`0yJi$q
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) %pxHGO=)E
: CDialog(CCaptureDlg::IDD, pParent) %8KbVjn
{ cS",Bw\
//{{AFX_DATA_INIT(CCaptureDlg) 5n=~l[O
m_bControl = FALSE; wWJM./y
m_bAlt = FALSE; -+Ox/>k
m_bShift = FALSE; ocj^mxh=O
m_Path = _T("c:\\"); tY`%vI [
m_Number = _T("0 picture captured."); S8e ?-rC
nCount=0; YB9)v5Nz(
bRegistered=FALSE; G'iE`4`2
bTray=FALSE; tRR<4}4R
//}}AFX_DATA_INIT _]kw |[)
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ?J5E.7o
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); T
mH5+
} zrA=?[
P9gAt4i
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) d`xDv$QZ
{ *kNXju
CDialog::DoDataExchange(pDX); RPTIDA))
//{{AFX_DATA_MAP(CCaptureDlg) u0Opn=(_
DDX_Control(pDX, IDC_KEY, m_Key); 8J0#lu
DDX_Check(pDX, IDC_CONTROL, m_bControl); &*qAB)**
DDX_Check(pDX, IDC_ALT, m_bAlt); ou\~^
DDX_Check(pDX, IDC_SHIFT, m_bShift); kybDw{(}gc
DDX_Text(pDX, IDC_PATH, m_Path); LII4sf]
DDX_Text(pDX, IDC_NUMBER, m_Number); JF9r[%
//}}AFX_DATA_MAP U;]h/3P
} *5" )3\/
j-/F*P
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) YZc{\~d
//{{AFX_MSG_MAP(CCaptureDlg) Mir(
}E
ON_WM_SYSCOMMAND() <OGXKv@
ON_WM_PAINT() XNkZ^3mq
ON_WM_QUERYDRAGICON() .#Lu/w' -M
ON_BN_CLICKED(ID_ABOUT, OnAbout) ]L!:/k,=S
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) vn.j>;E'
ON_BN_CLICKED(ID_CHANGE, OnChange) 6P`!yBAu
//}}AFX_MSG_MAP CuYSvW
END_MESSAGE_MAP() ghaO#kI
ej]>*n
BOOL CCaptureDlg::OnInitDialog() 'Fa~l'G7X
{ hx!hI1
CDialog::OnInitDialog(); RxGZ#!j/
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); s,8g^aF4
ASSERT(IDM_ABOUTBOX < 0xF000); SuJ4)f;'0
CMenu* pSysMenu = GetSystemMenu(FALSE); 'dd[=vzK
if (pSysMenu != NULL) Vdb X4^V
{ B"Ttr+
CString strAboutMenu; M~djX} #\
strAboutMenu.LoadString(IDS_ABOUTBOX); jGKI|v4U(
if (!strAboutMenu.IsEmpty()) ;<s0~B#9}
{ g$9s}\6B
pSysMenu->AppendMenu(MF_SEPARATOR); KiMEd373-
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Y'x+!&H
} ft Rza
} 9:CM#N~?o
SetIcon(m_hIcon, TRUE); // Set big icon q=/ck
SetIcon(m_hIcon, FALSE); // Set small icon O.'\GM
m_Key.SetCurSel(0); b[my5Ol
RegisterHotkey(); ka| 8 _C^z
CMenu* pMenu=GetSystemMenu(FALSE); FrQRHbp3
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); j<-YK4.t
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ?`=r@
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); F'JceU
return TRUE; // return TRUE unless you set the focus to a control a*{ -r]
} XjJ[7"hs*
F)uS2
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ]|K@0,
{ -<@QR8:
if ((nID & 0xFFF0) == IDM_ABOUTBOX) k`r`ZA(kQ-
{ =o,6iJ^?$m
CAboutDlg dlgAbout; Qg
gx:
dlgAbout.DoModal(); gP>`DPgb^
} h$a%PaVf
else !^(?C@TQ
{ S0p[Kt
CDialog::OnSysCommand(nID, lParam); /\UFJ
} ; +R
} 7Ezy-x2h
,&rHBNS
void CCaptureDlg::OnPaint() rL<a^/b/=
{
bjB4
if (IsIconic()) bLyaJ%pa\/
{ Wt9'-"c
CPaintDC dc(this); // device context for painting 7G
&I]>
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); @LR :^>&*
// Center icon in client rectangle ^ub@Jwe
int cxIcon = GetSystemMetrics(SM_CXICON); N&-J,p~
int cyIcon = GetSystemMetrics(SM_CYICON); hBNA,e:
CRect rect; }:4b_-&Q5
GetClientRect(&rect); ^n<o,K4\}
int x = (rect.Width() - cxIcon + 1) / 2; T8-,t];i
int y = (rect.Height() - cyIcon + 1) / 2; TCetd#;R
// Draw the icon #'oGtFCd`
dc.DrawIcon(x, y, m_hIcon); x10u?@
} "'*w_H0
else Ggp. %kS6F
{ q;=! =aRg
CDialog::OnPaint(); ]Qh0+!SdG
} NmZowh$M
} NVq3h\[X
%H8s_O
HCURSOR CCaptureDlg::OnQueryDragIcon() N9gbj%+
{ y-^m
return (HCURSOR) m_hIcon; PuGc{kt
} s(shgI 3g
~)IiF.I b
void CCaptureDlg::OnCancel() +:#UU;W
{ nx'Yevi0$
if(bTray) ad,pHJ`
DeleteIcon(); >}6V=r3[+
CDialog::OnCancel(); 5 p! rZ
} \ 3HB
zpBkP-%}E
void CCaptureDlg::OnAbout() 2(K@V6j$M
{ 8)51p+a
CAboutDlg dlg; l"1at eM3
dlg.DoModal(); }q D0-
} Q,<V)
VVDd39q
void CCaptureDlg::OnBrowse() oeIza<:=R
{ o=y0=,:a?9
CString str; _"688u'88
BROWSEINFO bi; 'fr~1pmx#3
char name[MAX_PATH]; H&E3RU>`
ZeroMemory(&bi,sizeof(BROWSEINFO)); ,RIC _26
bi.hwndOwner=GetSafeHwnd(); iFkXt<_A
bi.pszDisplayName=name; _2E*
bi.lpszTitle="Select folder"; 6Dz N.fz
bi.ulFlags=BIF_RETURNONLYFSDIRS; )HJ#|JpxC
LPITEMIDLIST idl=SHBrowseForFolder(&bi); 8a,pDE
if(idl==NULL) L@>$
Aw
return; x4%1P w
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); [ T!0ka
str.ReleaseBuffer(); d@e2+3<
m_Path=str; 5!*@gn
if(str.GetAt(str.GetLength()-1)!='\\') Z[?zaQ$
m_Path+="\\"; 1&#qq*{
UpdateData(FALSE); n,8bQP=&
} XAw0Nn
xmNs<mz
void CCaptureDlg::SaveBmp() e]q(fPK
{ 8m"jd+
CDC dc; '4]_~?&x
dc.CreateDC("DISPLAY",NULL,NULL,NULL); F0]xc
CBitmap bm; LMTz/M
int Width=GetSystemMetrics(SM_CXSCREEN); uwo\FI
int Height=GetSystemMetrics(SM_CYSCREEN); d_aHUmI^"
bm.CreateCompatibleBitmap(&dc,Width,Height); $s"{C"4q
CDC tdc; } za"rU
tdc.CreateCompatibleDC(&dc); c=#V*<
CBitmap*pOld=tdc.SelectObject(&bm); x#c%+
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); y`8bx94jB
tdc.SelectObject(pOld); iTIYq0u|#R
BITMAP btm; E2u9>m4_J
bm.GetBitmap(&btm); 3*!w c.=
DWORD size=btm.bmWidthBytes*btm.bmHeight; ]@A}v\wa
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); >Pf\"%*
BITMAPINFOHEADER bih; xnvG5
bih.biBitCount=btm.bmBitsPixel; $i]G'fj
bih.biClrImportant=0; AtYqD<hl:
bih.biClrUsed=0; Td,s"p>Vq
bih.biCompression=0; iWp
6^g
bih.biHeight=btm.bmHeight; S\R5SRE
bih.biPlanes=1; +
[~)a4#
bih.biSize=sizeof(BITMAPINFOHEADER); fe8}2#<o
bih.biSizeImage=size; 2 pmqP-pKd
bih.biWidth=btm.bmWidth; UWo*%&J
bih.biXPelsPerMeter=0; GvI8W)d3,R
bih.biYPelsPerMeter=0; $~)YI/b
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); W@FSQ8b>$m
static int filecount=0; 0AD8X+M{P
CString name; ,jq:%Y[KZ
name.Format("pict%04d.bmp",filecount++); :b`ywSp`
name=m_Path+name; P87Lo4Rd
BITMAPFILEHEADER bfh; Q.} guI\
bfh.bfReserved1=bfh.bfReserved2=0; fprP$MbI
bfh.bfType=((WORD)('M'<< 8)|'B'); FL E3LH
bfh.bfSize=54+size; o8h`9_
bfh.bfOffBits=54; 7r o&Q%
CFile bf; pj#l s
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Z~1uyr(
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); uZe"M(3r$
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); d3"QCl
bf.WriteHuge(lpData,size); [ahK+J
bf.Close(); TE% i
nCount++; J>8kJCh9g
} a4\j.(w)$D
GlobalFreePtr(lpData); E{BX $R_8
if(nCount==1) YDYN#Ob(;
m_Number.Format("%d picture captured.",nCount); l!mx,O`
else gfJHB3@
m_Number.Format("%d pictures captured.",nCount); L L?
.E
UpdateData(FALSE); A~({vb'
} ;(&S1Rv9
i "d&U7Q
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) t W}"PKv
{ MFQyB+Z
if(pMsg -> message == WM_KEYDOWN) IxaF*4JG
{ u~7fK
if(pMsg -> wParam == VK_ESCAPE) 2#oU2si
return TRUE; _F},Wp:Oh
if(pMsg -> wParam == VK_RETURN) .t7ME{
return TRUE; s
w{e |
} o[)*Y`xq<w
return CDialog::PreTranslateMessage(pMsg); 3?e~J"WXC5
} c8LMvL
Vw]!Kb7tA
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) eY[kUMo
{ 'P)c'uqd#
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ;zT3Fv\
SaveBmp(); otX/sg.B*
return FALSE; |u]IOw&1
} 3JEg3|M(
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){
JKV&c=I
CMenu pop; `BVXF#sb
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); K[yP{01
CMenu*pMenu=pop.GetSubMenu(0); 1my1m
pMenu->SetDefaultItem(ID_EXITICON); ;Z); k`j
CPoint pt; {2 k]$|
GetCursorPos(&pt); //'&a-%$^
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); +xd@un[r<
if(id==ID_EXITICON) 'xLXj>
DeleteIcon(); !e:_$$j
else if(id==ID_EXIT) ;YW@ 3F-h
OnCancel(); 7\R"RH-
return FALSE; w&Gc#-B
} g%!U7CM6h
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 5/7(>ivn
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) JEMc _ngR!
AddIcon(); )c'E9ZuZ>d
return res; m]8*k=v
} |\G^:V[.
1+XM1(|c`
void CCaptureDlg::AddIcon() cGdYfi
{ rPGj+wL5-
NOTIFYICONDATA data; /@\R
data.cbSize=sizeof(NOTIFYICONDATA); BzO,(bd!PI
CString tip; $gD8[NAIx=
tip.LoadString(IDS_ICONTIP); z0SF2L H
data.hIcon=GetIcon(0); .Y^cs+-o
data.hWnd=GetSafeHwnd(); c:>&YGmhu
strcpy(data.szTip,tip); 8UqH"^9.Q7
data.uCallbackMessage=IDM_SHELL; xSSEDfq
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; tpO'<b
data.uID=98; 7C,giCYU
Shell_NotifyIcon(NIM_ADD,&data); y)CvlI
ShowWindow(SW_HIDE); [A"=!e$<
bTray=TRUE;
6ST(=X_C
} ka8Y+Gs
[0]A-#J
void CCaptureDlg::DeleteIcon() ZILJXX4
{ v~x4Y,m%
NOTIFYICONDATA data; 0BhcXHt
data.cbSize=sizeof(NOTIFYICONDATA); ]W`?0VwF
data.hWnd=GetSafeHwnd(); c1jRj=\
data.uID=98; g,]m8%GHE
Shell_NotifyIcon(NIM_DELETE,&data); J@6j^U
ShowWindow(SW_SHOW); tH.L_< N
SetForegroundWindow(); QeuM',6R
ShowWindow(SW_SHOWNORMAL); 9q_{_%G%
bTray=FALSE; =W:=}ODD
} ?6`B;_m
kROIVO1|`
void CCaptureDlg::OnChange() mTxqcQc:7
{ <r t$~}
RegisterHotkey(); +qC[X~\
} ]S[?tn
0F/[GZ<k
BOOL CCaptureDlg::RegisterHotkey() 3]mprX'
{ T]-MrnO
UpdateData(); ]7Sf)
UCHAR mask=0; 8(L2w|+B<
UCHAR key=0; NjOUe?BQ
if(m_bControl) R]&Csr#~
mask|=4; e(|Z<6
if(m_bAlt) -bHlFNRm
mask|=2; /(51\RYkir
if(m_bShift) [X!w@d= i
mask|=1; gK({InOP
key=Key_Table[m_Key.GetCurSel()]; W.jXO"pN
if(bRegistered){ .O5V;&,
DeleteHotkey(GetSafeHwnd(),cKey,cMask); m:[I$b6AY
bRegistered=FALSE; p^<(.+P4
} -mG`* 0
cMask=mask; p$'S\W|
cKey=key; vJ^~J2#5
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 'g,h
return bRegistered; ^4^N} 7>5
} Q+9:]Bt
".(vR7u'
四、小结 D_czUM
\WE&5
9G
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。