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:
}j`#s
u;G-46 一、实现方法
2QIx~Er Ci9]#)"c 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:
%n B}Hq ; hEhvA6f, #pragma data_seg("shareddata")
_ci8!PP HHOOK hHook =NULL; //钩子句柄
GtLnh~) UINT nHookCount =0; //挂接的程序数目
a1dkB"Zp.p static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
j"5 $m@lgn static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
vX;~m7+ static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
}Gf9.ACQ static int KeyCount =0;
89Ch'D static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
)dh_eqnX #pragma data_seg()
}}b &IA# sD=iHO
Am 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
[cso$Tv 6^vz+oN 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:
HRg< f= oz >xCc#]v& BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
AFdBf6/"i cKey,UCHAR cMask)
8," 5z_ {
n?mV(? N BOOL bAdded=FALSE;
9f #6Q*/ for(int index=0;index<MAX_KEY;index++){
4Ai#$SHLm if(hCallWnd[index]==0){
Lj2Au_5 hCallWnd[index]=hWnd;
zvOSQxGQ HotKey[index]=cKey;
+'V ,z HotKeyMask[index]=cMask;
]@A31P4t| bAdded=TRUE;
}cO}H2m KeyCount++;
kO}QOL4 break;
|%$mN{ }
jI!WE$dt }
}AGdWt@ return bAdded;
Q@ghQGn# }
-izZ D //删除热键
w%?6s 3 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
]I:h4hgw {
|R3A$r#- BOOL bRemoved=FALSE;
M
_e^KF for(int index=0;index<MAX_KEY;index++){
!n3J6%b9y/ if(hCallWnd[index]==hWnd){
>A.m`w if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
2)T.Ci cx hCallWnd[index]=NULL;
+`&-xq76 HotKey[index]=0;
pxV@ fH+` HotKeyMask[index]=0;
dOFK; bRemoved=TRUE;
"JpnmE[` KeyCount--;
e)#f`wM break;
NR.YeKsBq }
-F&*>?I }
lG R6S }
chszP{-@X return bRemoved;
D:#e;K }
' }T6dS uePa4e! +
0 |d2_]E DLL中的钩子函数如下:
GF17oMi ?TMrnR/d LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
!b{7gUjyI {
&BE'~G BOOL bProcessed=FALSE;
IRK(y*6 if(HC_ACTION==nCode)
}0
b[/ZwQ {
;oivG)hJl if((lParam&0xc0000000)==0xc0000000){// 有键松开
V1 O]L66 switch(wParam)
U}:e- {
Bs;.oK5!n@ case VK_MENU:
hZ~\Z
S7 MaskBits&=~ALTBIT;
|.{[%OJP break;
~9JLqN" case VK_CONTROL:
LgJUMR8vUO MaskBits&=~CTRLBIT;
%y[
t+)!E break;
ByivV2qd{ case VK_SHIFT:
~@ML>z7 MaskBits&=~SHIFTBIT;
l g43 break;
Ja%(kq[v default: //judge the key and send message
c=u'#|/eb break;
q %hxU.h }
"!z9UiA for(int index=0;index<MAX_KEY;index++){
D)GD9MJ if(hCallWnd[index]==NULL)
g3kF&+2i continue;
KiYz]IM$4 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
m$H(l4wB> {
o 4cqLMu SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
P<MNwdf(+ bProcessed=TRUE;
dZ{yNh.] }
,+o*>fD }
TW!>~|U)y }
%Kc 2n9W else if((lParam&0xc000ffff)==1){ //有键按下
Hmv@7$9s\ switch(wParam)
~]C m {
qV7nF
}V{ case VK_MENU:
H-'~c\) MaskBits|=ALTBIT;
@ZtDjxN
& break;
#n6<jF1G case VK_CONTROL:
gF8n{b MaskBits|=CTRLBIT;
<Kt;uu> break;
"Oq>i9v;|$ case VK_SHIFT:
gvy c(d MaskBits|=SHIFTBIT;
6+
C7vG` break;
~spfQV~ default: //judge the key and send message
'J(B{B7| break;
<p\iB'y }
09w<@# for(int index=0;index<MAX_KEY;index++){
(@ixV$Y if(hCallWnd[index]==NULL)
N3?@CM^hHw continue;
~[3B<^e if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
m\;@~o'k {
vj4n=F,Z SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
WN9K*Tt~o& bProcessed=TRUE;
C
]+J }
| x/Z
qY }
?nV& :~eY }
THf*<| if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
\%$z!]S> for(int index=0;index<MAX_KEY;index++){
6rg?0\A< if(hCallWnd[index]==NULL)
KQ2jeJ/pj continue;
+"F 9yb if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
JVt(!%K}& SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
nWb0S //lParam的意义可看MSDN中WM_KEYDOWN部分
D/Hob }
|nq}# }
V>:ubl8j0l }
]}HuK# return CallNextHookEx( hHook, nCode, wParam, lParam );
mrId`<L5l{ }
6ujePi <U #P5tTCM 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:
!/wR[`s9w E'wJ+X9 + BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
:y8wv|m BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
TYN~c( jw$[b=sa 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:
w//L2. 1k?k{Ri LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
iES?}K/q {
iU9> qJ] if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
GEQ3r'B| {
$9Asr07 //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
F2Nb]f SaveBmp();
_7Rp.)[& return FALSE;
\SQ wIM }
(OT&:WwW …… //其它处理及默认处理
zcE[wM }
w;4FN'
\'.#of e9@7GaL`"S 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。
8nQjD<- 0VBbSn}Z< 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。
jce^Xf flzHZH 二、编程步骤
d/!R;,^ VMb r@9 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";
G~fM!F0 uIb,n5 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
p`}'-A|@ +ew9%={zB 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;
Ql.abU i_kKE+Q 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;
76j5 FatLc|[ 5、 添加代码,编译运行程序。
(S=RFd 0Z<&M|G 三、程序代码
y8|?J\eRy $2lPUQZ<5 ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
Uf<hzP #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
{B,r #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
]v,>!~8r #if _MSC_VER > 1000
QfHO3Y6h[ #pragma once
MPI=^rc2 #endif // _MSC_VER > 1000
csNB
\ #ifndef __AFXWIN_H__
afNqK~ #error include 'stdafx.h' before including this file for PCH
l1MVC@'pvP #endif
l\%LT{$e #include "resource.h" // main symbols
SFQYrY class CHookApp : public CWinApp
]F81N(@:F {
$bd2TVNV: public:
E3==gYCe* CHookApp();
~qj09 // Overrides
=
gbB)u-Pc // ClassWizard generated virtual function overrides
_)6 N&u8 //{{AFX_VIRTUAL(CHookApp)
2qkZ B0[ public:
L}x,>hbT virtual BOOL InitInstance();
Fy8$'oc virtual int ExitInstance();
klwNeGF]N //}}AFX_VIRTUAL
_0: }"!Gq //{{AFX_MSG(CHookApp)
S#wy+* // NOTE - the ClassWizard will add and remove member functions here.
/
Hg/) // DO NOT EDIT what you see in these blocks of generated code !
M)v4>Rw+ //}}AFX_MSG
;LjTsF' DECLARE_MESSAGE_MAP()
eK=<a<tx };
vl67Xtk4 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
"-HmXw1+t BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
(;.wsz&K BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
CW9vC BOOL InitHotkey();
D8S3YdJ BOOL UnInit();
- IF3'VG #endif
nnol)|C{5Y %zCV>D //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
eG05} #include "stdafx.h"
isiehKkD #include "hook.h"
zIE{U #include <windowsx.h>
TC$)::C1 #ifdef _DEBUG
U'K{>"~1a #define new DEBUG_NEW
!CO1I-yL #undef THIS_FILE
E)}& p\{E static char THIS_FILE[] = __FILE__;
IVblSiFF #endif
-4IHs=`;I #define MAX_KEY 100
/suW{8A(E #define CTRLBIT 0x04
eKw!%97> #define ALTBIT 0x02
#lld*I"d #define SHIFTBIT 0x01
b)1v:X4Bv= #pragma data_seg("shareddata")
F\G-. 1 HHOOK hHook =NULL;
AZgeu$:7p< UINT nHookCount =0;
+thkx$o static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
f+K vym. static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
jqeR{yo&0b static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
!i{9wI static int KeyCount =0;
KqI<#hUl static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
ZJ
Ke}F`l #pragma data_seg()
N">4I) HINSTANCE hins;
l1?$quM^V void VerifyWindow();
`{GI^kgJ9 BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
^KRe( //{{AFX_MSG_MAP(CHookApp)
*@1(!A // NOTE - the ClassWizard will add and remove mapping macros here.
V@C8HTg
// DO NOT EDIT what you see in these blocks of generated code!
.nG14i7C //}}AFX_MSG_MAP
6J""gyK. END_MESSAGE_MAP()
rUL_=>3 Jdc{H/10 CHookApp::CHookApp()
gFQ\zOlY8a {
f}%paE" // TODO: add construction code here,
:Ou[LF.O // Place all significant initialization in InitInstance
b:6NVHb% }
f2f2&|7 T>cO{I CHookApp theApp;
Am @o}EC LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
Z,Z4Sp {
>=+:lD BOOL bProcessed=FALSE;
vv
FH (W if(HC_ACTION==nCode)
aF!Im} {
WNmG'hlA if((lParam&0xc0000000)==0xc0000000){// Key up
N R0"yJV> switch(wParam)
nd4Z5=X {
r\."=l case VK_MENU:
ZCC T MaskBits&=~ALTBIT;
618k- break;
#q
mv(VB4 case VK_CONTROL:
:Q-QY)hH MaskBits&=~CTRLBIT;
=Sp+$:q* break;
FBP'AL| case VK_SHIFT:
bK69Rb@\A MaskBits&=~SHIFTBIT;
k+5l
break;
q4y sTm default: //judge the key and send message
)kpNg:2p break;
$3'xb/3| }
Qt+i0xd for(int index=0;index<MAX_KEY;index++){
V7}]39m(s if(hCallWnd[index]==NULL)
lh`ZEvt continue;
nQaryL if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
ZR8%h< {
xMr=tU1C SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
kE`Fg(M bProcessed=TRUE;
8W"Xdv{ }
\WPy9kRU }
/Y#Q<=X }
`37%|e 3bQ else if((lParam&0xc000ffff)==1){ //Key down
B{hV|2 switch(wParam)
]VcuD05"C {
l&Cy K#B:\ case VK_MENU:
F(DM$5z[ MaskBits|=ALTBIT;
9@^N*
E+ break;
;BmPP, case VK_CONTROL:
{\u6Cj x MaskBits|=CTRLBIT;
X@pcL{T! break;
i[4t`v'Dk case VK_SHIFT:
@=NTr MaskBits|=SHIFTBIT;
K3.z>.F'h break;
k@
So l6 default: //judge the key and send message
C-sFTf7 break;
~oX`Gih }
[R(d Cq> for(int index=0;index<MAX_KEY;index++)
dh-?_|" {
S[5OTwa8L if(hCallWnd[index]==NULL)
q5G`N>"V continue;
Y1-=H)G if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
3S=$ng {
W!R7D%nX SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
's\rQ-TV bProcessed=TRUE;
%%+@s }
h )% e }
-_^#7] }
Y;1s=B9 if(!bProcessed){
u-u:7VtH0= for(int index=0;index<MAX_KEY;index++){
">v-CSHY if(hCallWnd[index]==NULL)
o\N^Uu continue;
E4N"|u| if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
SNrX(V::z SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
gHox>r6.A }
cXIuGvE&= }
f#&@Vl(i& }
E^C [G)7n return CallNextHookEx( hHook, nCode, wParam, lParam );
`1i\8s&O6@ }
<~hx ~"c _+ERX[i BOOL InitHotkey()
R@
MXwP {
'byao03 if(hHook!=NULL){
0
} |21YED nHookCount++;
(YY!e2 return TRUE;
MZ%S3' }
(vPE?^}b else
z0 J:"M hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
FvyC$vip if(hHook!=NULL)
P/[}$(&: nHookCount++;
xzb{g,c return (hHook!=NULL);
T!1Np'12zF }
c?}{>ig/) BOOL UnInit()
i;<K)5Z {
0~Iq9}{*P if(nHookCount>1){
G7k.YtW nHookCount--;
bW2Msv/H return TRUE;
]T>|Y0 | }
c|F2 6$rv BOOL unhooked = UnhookWindowsHookEx(hHook);
{4B7a6 if(unhooked==TRUE){
')Qb,#/,% nHookCount=0;
B*^8kc:)L hHook=NULL;
e/Y&d9`
I }
0Ci:w|J return unhooked;
(G 9Ku 8Y }
f!bGH-.r5 mMtva}=* BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
6.M!WK{+ {
ch)#NHZ9F BOOL bAdded=FALSE;
2>vn'sXdj for(int index=0;index<MAX_KEY;index++){
B&sa|'0U if(hCallWnd[index]==0){
9=9R"X>L hCallWnd[index]=hWnd;
LDbo=w HotKey[index]=cKey;
OyATb{`' HotKeyMask[index]=cMask;
yJ2A!id bAdded=TRUE;
,ik\MSS KeyCount++;
s@K #M break;
2$O6%0 }
:9W)CwZ)V }
W:1GY#Pe return bAdded;
kj@m5`G }
:o_6
~-BIUZ; BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
z<u@:: {
E@8< BOOL bRemoved=FALSE;
vJg^uf) for(int index=0;index<MAX_KEY;index++){
5[A4K%EL if(hCallWnd[index]==hWnd){
`_E@cZ4 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
fYzZW hCallWnd[index]=NULL;
,,~|o3cfq HotKey[index]=0;
Zrp9`~_g<! HotKeyMask[index]=0;
E|ZLz~ bRemoved=TRUE;
%5/h;4
KeyCount--;
p2j=73$ break;
Wa'm]J }
r~sQdf }
!;B^\
8{ }
qdwjg8fo4Z return bRemoved;
cB4p.iO
}
e2Df@8> O^4Ko} void VerifyWindow()
JDm7iJxc_ {
UP@-@syGw for(int i=0;i<MAX_KEY;i++){
g({dD; if(hCallWnd
!=NULL){ Y-G;;~
if(!IsWindow(hCallWnd)){ K2ry@haN
hCallWnd=NULL; 8p.O rdp
HotKey=0; ek]CTUl*
HotKeyMask=0; ym6gj#2m
KeyCount--; uDG#L6
} T^.W'
} c{cJ>d 0
} vY(xH>Fd
}
qh9Ix
Z{
b($po
BOOL CHookApp::InitInstance() ?iaD;:'qE
{ S1W(]%0/
AFX_MANAGE_STATE(AfxGetStaticModuleState()); Hh0a\%!
hins=AfxGetInstanceHandle(); ['_G1_p
InitHotkey(); Hbi2amfBu
return CWinApp::InitInstance(); #AUa'qBt
} P:2 0i*QU
S`&YY89{&
int CHookApp::ExitInstance() 4&^BcWqA*f
{ l;'c6o0e
VerifyWindow(); c!=^C/5Ee
UnInit(); &HYs^|ydrr
return CWinApp::ExitInstance(); Avi8&@ya
} Wf:I
0
O)9{qU:[b
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file VH5Vg We
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Dv[ 35[Yh
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ t"]~e"
#if _MSC_VER > 1000 K;#9:
Z^+
#pragma once XV*uu "F
#endif // _MSC_VER > 1000 tS&rR0<OW
mLL?n)
class CCaptureDlg : public CDialog +)l6%QKcW
{ oN
" /w~
// Construction tQrkRg(E:
public: {h *Pkn1
BOOL bTray; m@^!?/as
BOOL bRegistered; VJ$UpqVm
BOOL RegisterHotkey(); Ee -yP[2
*
UCHAR cKey; PK|"+I0
UCHAR cMask; Ae 3:"
void DeleteIcon(); xk$U+8K
void AddIcon(); cG~-OHU
UINT nCount; H}B%OFI \+
void SaveBmp(); [_?dp aTt
CCaptureDlg(CWnd* pParent = NULL); // standard constructor q/HwcX+[b
// Dialog Data mo-
Y %
//{{AFX_DATA(CCaptureDlg) 0N19R 5NN8
enum { IDD = IDD_CAPTURE_DIALOG }; nnPY8pdjSD
CComboBox m_Key; T?'Vb
BOOL m_bControl; o$-!E(p
BOOL m_bAlt; ds" q1
BOOL m_bShift; sZ9VXnz24
CString m_Path; )I`Ma6bX
CString m_Number; Zqnwf
//}}AFX_DATA x-HN]quhe
// ClassWizard generated virtual function overrides x)Ls(Xh+g
//{{AFX_VIRTUAL(CCaptureDlg) MUfhk)"
public: @>sZ'M2mq
virtual BOOL PreTranslateMessage(MSG* pMsg); I,d5Y3mC
protected: FOx&'dH%@
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support O$,MdhyXC
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); >|@i8?|E
//}}AFX_VIRTUAL ~i y]X:U
// Implementation ?#0|A?U
protected: 0O:')R&
HICON m_hIcon; .y~vn[q N
// Generated message map functions zs~v6y@
//{{AFX_MSG(CCaptureDlg) uWE
:3
virtual BOOL OnInitDialog(); }L.&@P<
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); *c6o#[l
afx_msg void OnPaint(); eAD uk!Iq
afx_msg HCURSOR OnQueryDragIcon(); j"c30AY
virtual void OnCancel(); @?r[
$Ea1M
afx_msg void OnAbout(); l4+Bs!i`
afx_msg void OnBrowse(); mE}@}@(
afx_msg void OnChange(); ^N\$oV$
//}}AFX_MSG a{FCg%vD)
DECLARE_MESSAGE_MAP() Gn8'h
TM
}; 1||\3L/
#endif mjtmN0^SR
_rU%DL?
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file kg^VzNX
#include "stdafx.h" qu:nV"~_
#include "Capture.h" F+3}Gkn
#include "CaptureDlg.h" Lradyo44u\
#include <windowsx.h> .sOEqwO}>
#pragma comment(lib,"hook.lib") ?]]d
s]
#ifdef _DEBUG )IH|S5mG?
#define new DEBUG_NEW C>:'@o
Z
#undef THIS_FILE b,Vg3BS
static char THIS_FILE[] = __FILE__; }[gk9uM_7
#endif ecRY,MN
#define IDM_SHELL WM_USER+1 #{BHH;J+
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); J>XMaI})U
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); d^sm;f
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; P@wu k1
class CAboutDlg : public CDialog 2/W5E-tn
{ }; ;Thfd
public: g VPtd[r
CAboutDlg();
:ENdF `nC
// Dialog Data KtO|14R:
//{{AFX_DATA(CAboutDlg) (L3Etan4RE
enum { IDD = IDD_ABOUTBOX }; c?0.>^,B Q
//}}AFX_DATA o'SZsG
// ClassWizard generated virtual function overrides AYP*J
//{{AFX_VIRTUAL(CAboutDlg) (:P-ef$]C
protected: Gjh8>(
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support <X b B;
//}}AFX_VIRTUAL _vV3A3|Ec,
// Implementation v{[:7]b_=
protected: t)
:'XGk@
//{{AFX_MSG(CAboutDlg) Sb& $xWL
//}}AFX_MSG y9xvGr[l
DECLARE_MESSAGE_MAP() W#.+C6/
}; y`|86`
Y
,&5\`
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) R#^.8g)t
{ !\6<kQg#
//{{AFX_DATA_INIT(CAboutDlg) f"}g5eg+
//}}AFX_DATA_INIT ac%6eW0#
} 7B)m/%>3s
1z5Oi u
void CAboutDlg::DoDataExchange(CDataExchange* pDX) FP_q?=~rFs
{ 4Nun-(q
CDialog::DoDataExchange(pDX); _/>JM0
//{{AFX_DATA_MAP(CAboutDlg) #{DX*;1m
//}}AFX_DATA_MAP u9zEhfg8
} p"UdD
L<62-+e`
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) o<8('j
//{{AFX_MSG_MAP(CAboutDlg) e>] gCa
// No message handlers <1%(%KdN[
//}}AFX_MSG_MAP Z.l4<
END_MESSAGE_MAP() S<Os\/*
w$##GM=Tq
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) x,% %^(
: CDialog(CCaptureDlg::IDD, pParent) a7@':Rb n
{ LN0pC}F
//{{AFX_DATA_INIT(CCaptureDlg) /L yoTBG
m_bControl = FALSE; BtA_1RO
m_bAlt = FALSE; BH"OphE
m_bShift = FALSE; h%%ryQQ&<
m_Path = _T("c:\\"); J6[V7R[\
m_Number = _T("0 picture captured."); {KGEv%
nCount=0; tSVWO]<
bRegistered=FALSE; [Xyu_I-c
bTray=FALSE; U5RLM_a@M
//}}AFX_DATA_INIT >_J9D?3S
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 SIridZ*%
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); $Vp*,oRL
} 90[6PSXk
~~\C.6c#
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) H-&T)
{ v6C$Y+5~
CDialog::DoDataExchange(pDX); 'w z6Zt
//{{AFX_DATA_MAP(CCaptureDlg) }]
p9
DDX_Control(pDX, IDC_KEY, m_Key); Fc6o6GyL|o
DDX_Check(pDX, IDC_CONTROL, m_bControl); S 6CI+W
DDX_Check(pDX, IDC_ALT, m_bAlt); -^aJ}[uaI
DDX_Check(pDX, IDC_SHIFT, m_bShift); [o"<DP6w
DDX_Text(pDX, IDC_PATH, m_Path); ?:$\
t?e^
DDX_Text(pDX, IDC_NUMBER, m_Number); D
0 O^=v|
//}}AFX_DATA_MAP Fd86P.Df
} ]?6Pt:N2
&.l^> #
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 'L@kZ
//{{AFX_MSG_MAP(CCaptureDlg) DYDeb i6
ON_WM_SYSCOMMAND() F1)5"7f
ON_WM_PAINT() 8g0VTY4$jP
ON_WM_QUERYDRAGICON() r@a]fTf
ON_BN_CLICKED(ID_ABOUT, OnAbout) YO'aX
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) bEKh U\@=J
ON_BN_CLICKED(ID_CHANGE, OnChange) %b[>eIJU#
//}}AFX_MSG_MAP 2{Y~jYt{h
END_MESSAGE_MAP() z?^oy.
re~T,PPM
BOOL CCaptureDlg::OnInitDialog() ZfMs6`Wv
1
{ p9>1a j2a
CDialog::OnInitDialog(); k5%W8dI
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); B[,AR"#b
ASSERT(IDM_ABOUTBOX < 0xF000); uCr :+"C
CMenu* pSysMenu = GetSystemMenu(FALSE); ?o6X_UxW!
if (pSysMenu != NULL) M>_vsI^I'
{ k-Yli21-/|
CString strAboutMenu; 'eo/"~/*w
strAboutMenu.LoadString(IDS_ABOUTBOX); ~].?8C.>*
if (!strAboutMenu.IsEmpty())
CkV5PU
{ Qhq' %LR
pSysMenu->AppendMenu(MF_SEPARATOR); 3_ly"\I\
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); v YJ9G"E
} ;_=N
YG.
} PU,%Y_xR
SetIcon(m_hIcon, TRUE); // Set big icon `/O AgV"`
SetIcon(m_hIcon, FALSE); // Set small icon L^jjf8_
m_Key.SetCurSel(0); "Ccyj /
RegisterHotkey(); 16ZyLt
CMenu* pMenu=GetSystemMenu(FALSE); `Gj(>z*
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); dEZUK vo
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); lrAhdi
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); -VeCX]
return TRUE; // return TRUE unless you set the focus to a control B<Q)z5KK
} 0NeIQr1N_
*`q?`#1&&.
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ", p5}}/
{ %tMx48'N
if ((nID & 0xFFF0) == IDM_ABOUTBOX) lSg[7lt
{ !:PiQ19
'u
CAboutDlg dlgAbout; -.Blj<2ah
dlgAbout.DoModal(); P8(hHuO
} ^Z-oO#)h#
else uzI=.j
{ u"uL,w
1-
CDialog::OnSysCommand(nID, lParam); [!De|,u(^
} 57~y 7/ 0
} Ptc+ypTu
-&COI-P8
void CCaptureDlg::OnPaint() XEnu0gr
{ W=#AfPi$&
if (IsIconic()) }v's>Ae~p
{ 2Rt6)hgY
CPaintDC dc(this); // device context for painting 1uO2I&B
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); #R>x]Nt}
// Center icon in client rectangle R_O=WmD
int cxIcon = GetSystemMetrics(SM_CXICON); jsQHg2Vd
int cyIcon = GetSystemMetrics(SM_CYICON); z %Bzf~N9
CRect rect; @c-
GetClientRect(&rect); +fvD1xHI
int x = (rect.Width() - cxIcon + 1) / 2; qJag>OY
int y = (rect.Height() - cyIcon + 1) / 2; !~&&&85
// Draw the icon xeL"FzF:V
dc.DrawIcon(x, y, m_hIcon); S=0DQ19
} *s,[Uy![
else lLp,sNAj
{ :r@t '
CDialog::OnPaint(); `%
QvCAR
} -72EXO=|
} 1~'jC8&J
9vz\R-un
HCURSOR CCaptureDlg::OnQueryDragIcon() 4-t^?T:qF
{ 5f{P% x(
return (HCURSOR) m_hIcon; :\vs kk),
} |{&M#qXe
)S
7+y6f&*
void CCaptureDlg::OnCancel() 4EHrd;|
{ >1(J
if(bTray) .[}G{%M~[
DeleteIcon(); z)S6f79`Q
CDialog::OnCancel(); f"KrPx!^b
} \XPGA uEo
<^\rv42'(2
void CCaptureDlg::OnAbout() j)2I+[aoB
{ T8|5%Y
CAboutDlg dlg; &iInru3
dlg.DoModal(); NNF"si\FE
} K8aqC{
*68 TTBq(
void CCaptureDlg::OnBrowse() :{2~s
{ 0|RofL&o
CString str; ?+))J~@t
BROWSEINFO bi; CVWT>M<
char name[MAX_PATH]; +rJ6DZ
ZeroMemory(&bi,sizeof(BROWSEINFO)); mwo:+^v(
bi.hwndOwner=GetSafeHwnd(); $'%GB $.
bi.pszDisplayName=name; ]
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bi.lpszTitle="Select folder"; @uH!n~QV
bi.ulFlags=BIF_RETURNONLYFSDIRS; y-db CYMc
LPITEMIDLIST idl=SHBrowseForFolder(&bi); {$,\Qg
if(idl==NULL) Bz<hP*.O
return; ZRG
Cy5Rk
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); >Jmla~A
str.ReleaseBuffer(); c3 O/#*
m_Path=str; F?|Efpzow?
if(str.GetAt(str.GetLength()-1)!='\\') E`UkL*Q
m_Path+="\\"; H;
NV?CD
UpdateData(FALSE); FDQ=$w}'>
} U\p`YZ
MzD1sWmK
void CCaptureDlg::SaveBmp() a(|6)w-
{ %(1OjfZc
CDC dc; ~<?Zj
dc.CreateDC("DISPLAY",NULL,NULL,NULL); TIKkS*$
CBitmap bm; *3H=t$1G}
int Width=GetSystemMetrics(SM_CXSCREEN); Z^:_,aJ?
int Height=GetSystemMetrics(SM_CYSCREEN); g#=<;X2
bm.CreateCompatibleBitmap(&dc,Width,Height); >I|8yqbfm
CDC tdc; st;iGg
tdc.CreateCompatibleDC(&dc); b2OwLt9
CBitmap*pOld=tdc.SelectObject(&bm); b)<WC$"
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); (T_-`N|
tdc.SelectObject(pOld); hO]F\0+
BITMAP btm; b3^:Bh9
bm.GetBitmap(&btm); `*3A7y
DWORD size=btm.bmWidthBytes*btm.bmHeight; z_!IA
] v
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ?
`p/jA
BITMAPINFOHEADER bih; &em~+83
bih.biBitCount=btm.bmBitsPixel; W;Y^(f
bih.biClrImportant=0; 0&UG=q
bih.biClrUsed=0; TKR#YJQ?K
bih.biCompression=0; KClkPL!jP
bih.biHeight=btm.bmHeight; \ZZ6r^99
bih.biPlanes=1; r8s>s6vm
bih.biSize=sizeof(BITMAPINFOHEADER); 5rows]EJJl
bih.biSizeImage=size; Gr\ ]6
bih.biWidth=btm.bmWidth; y:RW:D&
bih.biXPelsPerMeter=0; z2iMpZ
bih.biYPelsPerMeter=0; hzsQK_;S
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); d}\]!x3t
static int filecount=0; k( :Bl
CString name; 1.du#w
name.Format("pict%04d.bmp",filecount++); lo$G*LWu:
name=m_Path+name; w7Yu} JY^
BITMAPFILEHEADER bfh; ,VS\ mG/}s
bfh.bfReserved1=bfh.bfReserved2=0; J"C9z{[Z&
bfh.bfType=((WORD)('M'<< 8)|'B'); nQ\` ]_C
bfh.bfSize=54+size; mD'nF1o
Ly
bfh.bfOffBits=54; 2Mt$Dah
CFile bf; pG#tMec
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ MJ JC6:
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 4Hz3KKu
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); yv4x.cfI2W
bf.WriteHuge(lpData,size); l zFiZx
bf.Close(); }|Qh+{H*.
nCount++; }_nBegv
} q-(~w!e
GlobalFreePtr(lpData); _<(xjWp 8
if(nCount==1) 3+Lwtb}XPF
m_Number.Format("%d picture captured.",nCount); ,/?J!W@m
else n+8YTjd
m_Number.Format("%d pictures captured.",nCount); OkciL]
UpdateData(FALSE); h"1}j'2>@
} 8xLQ"
l+"
9
Zo s;
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) j\>&]0-Iq
{ ".>#Qp%
if(pMsg -> message == WM_KEYDOWN) BQ6$T&
{ p6- //0qb
if(pMsg -> wParam == VK_ESCAPE) `,V&@}&"n
return TRUE; }ppApJT
if(pMsg -> wParam == VK_RETURN) !
v![K
return TRUE; 9K&$8aD
} ^UvL1+
return CDialog::PreTranslateMessage(pMsg); 0XA\Ag\`G
} !f/K:CK|
vc: kY
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) >)WE3PT/O"
{ u.2X"
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ k{f1q>gd
SaveBmp(); f!+d*9
return FALSE; fz|*Plv
} D9g*+KM&
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ `:iMGqZN
CMenu pop; (csk
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); /(~
HHN nh
CMenu*pMenu=pop.GetSubMenu(0); Nf4@m|#
pMenu->SetDefaultItem(ID_EXITICON); NuO@Nr
CPoint pt; N6[Z*5efR
GetCursorPos(&pt); vu.ug$T
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); D\G 8p;
if(id==ID_EXITICON) r3Ol?p
DeleteIcon(); 570ja7C:
else if(id==ID_EXIT) vVB WhY]
OnCancel(); gX!K%qJBg
return FALSE; CZzt=9
} w_U#z(W3l
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ^h_rE
|c
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Lj /^cx
AddIcon(); LiEEQ
return res; _Q #[IH9
} *fY*Wy9
s {*rBX8N
void CCaptureDlg::AddIcon() .\`MoH
{ MZ)lNU l
NOTIFYICONDATA data; |3k r*#
data.cbSize=sizeof(NOTIFYICONDATA); :2
\NG}
CString tip; HE*^!2f
tip.LoadString(IDS_ICONTIP); 7IUJHc[R?
data.hIcon=GetIcon(0); [ !~8TF
data.hWnd=GetSafeHwnd(); fhk(<KZvJ
strcpy(data.szTip,tip); Zp/P/97p
data.uCallbackMessage=IDM_SHELL; Zc";R!At
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; >]B_+r0m^
data.uID=98; &|IO+'_
Shell_NotifyIcon(NIM_ADD,&data); DFwiBB6
ShowWindow(SW_HIDE); b 2\J<Nw
bTray=TRUE; A
_7I0^
} W^W.* ?e`
MHE/#G
void CCaptureDlg::DeleteIcon() <&+0[9x
{ (;Bh7Ft
NOTIFYICONDATA data; 6=%\@
data.cbSize=sizeof(NOTIFYICONDATA); 0 Swu]OE
data.hWnd=GetSafeHwnd(); T2?.o.&u
data.uID=98; G~zfPBN0D
Shell_NotifyIcon(NIM_DELETE,&data); _+}o/449
ShowWindow(SW_SHOW); 2(Xu?W 7d
SetForegroundWindow(); 4tkb7D
q
ShowWindow(SW_SHOWNORMAL); akj#.aYk
bTray=FALSE; E?&YcVA
} R<3 -!p1v
iQ;lvOja
void CCaptureDlg::OnChange() s_Z5M2o
{ ~Y1nU-
RegisterHotkey(); a/CY@V-
} rZAP3)dA
9G1ZW=83
BOOL CCaptureDlg::RegisterHotkey() P(\x. d:
{ '0Q/oU
UpdateData(); sCf)#6mI
UCHAR mask=0; e[Z-&'
UCHAR key=0; [IyC}lSW^-
if(m_bControl) aYtW!+#
mask|=4; K=4|GZ~p}`
if(m_bAlt) B%x?VOdBE
mask|=2; ,=pn}\R
if(m_bShift) fHuWBC_YO
mask|=1; D3O)Tj@:}(
key=Key_Table[m_Key.GetCurSel()]; ^]/V-!j
if(bRegistered){ '8^cl:X
DeleteHotkey(GetSafeHwnd(),cKey,cMask); iYW<qgz
bRegistered=FALSE; `/G9*tIR8g
} -lfbn=3
cMask=mask; {rF9[S"h
cKey=key; }_}LaEYAo
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 1vh[sKv9%
return bRegistered; VYK%0S9yH[
} {p$X*2ReB
4y)6!p
四、小结 1Fsa}UK
H.Z<T{y;
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。