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:
}
:@s
5D32d1A 一、实现方法
Wp[R$/uT ` 5.PPI\h2 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:
UE[5Bw?4X qx $-% P #pragma data_seg("shareddata")
k9ThWo/#u HHOOK hHook =NULL; //钩子句柄
0~5'O[NhF UINT nHookCount =0; //挂接的程序数目
?x|8"*N static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
EN =oA P static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
P sLMV:O9S static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
v ;q<h static int KeyCount =0;
8Q%rBl. static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
g0P^O@8 #pragma data_seg()
;;9W/m~] o6PDCaT7 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。
Tjfg[Z/x LyRU2A 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:
&{Zt(%\ ' fg mIx BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
d&dp#)._8 cKey,UCHAR cMask)
&3Q!'pJJ {
Z*}5M4 BOOL bAdded=FALSE;
$:#{Y;d for(int index=0;index<MAX_KEY;index++){
8%dE$smH if(hCallWnd[index]==0){
}CiB+ hCallWnd[index]=hWnd;
me+F0:L HotKey[index]=cKey;
=2
3H/ HotKeyMask[index]=cMask;
43"`gF] bAdded=TRUE;
V?a+u7*U& KeyCount++;
X_}2xo|T break;
UKBVCAK }
}w0>mA0=H }
G/2| *H return bAdded;
Iq@: n_~ }
ZZ<uiN$ //删除热键
5w\>Whbd BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
;<JyA3i^V, {
nty^De% BOOL bRemoved=FALSE;
1@j0kTJ~m for(int index=0;index<MAX_KEY;index++){
cBl
F if(hCallWnd[index]==hWnd){
=,/08Cs if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
D{]t50a. hCallWnd[index]=NULL;
~JJuM HotKey[index]=0;
GvL)SVv? HotKeyMask[index]=0;
_k0X)N+li bRemoved=TRUE;
q"|,HpQ KeyCount--;
t4a/\{/#9| break;
#+vIq? }
RJo"yB$1e6 }
SIBNU3;DL }
bOt6q/f return bRemoved;
oJcDs-! }
.o(XnY)cgJ s)=fs#% (8(7:aE$ DLL中的钩子函数如下:
D5wy7`c kjo,?$r
% LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
d+1q[,- {
9aED6 BOOL bProcessed=FALSE;
FCC9Ht8U? if(HC_ACTION==nCode)
}/ p>DMN {
&i&k 4 if((lParam&0xc0000000)==0xc0000000){// 有键松开
QJL%J switch(wParam)
5AvbKT {
!$/1Q+ case VK_MENU:
:N \j@yJK MaskBits&=~ALTBIT;
U#I8Rd I, break;
/B$9B case VK_CONTROL:
`aj;FrF MaskBits&=~CTRLBIT;
2VrO8q( break;
J33enQd case VK_SHIFT:
Xndgs}zz MaskBits&=~SHIFTBIT;
mVg$z break;
_I$\O5 default: //judge the key and send message
^
|k7g break;
wj-=#gyAoo }
tgy= .o] for(int index=0;index<MAX_KEY;index++){
@a08*"lbp if(hCallWnd[index]==NULL)
2yu\fu continue;
V
&K:~[ M if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
#1INOR9 {
7QXA*.'
F SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
j-egsKR bProcessed=TRUE;
wA+QUN3#n }
O
"jX|5 }
U*G8}W }
Y#>'.$(Az else if((lParam&0xc000ffff)==1){ //有键按下
C@{#OOa switch(wParam)
wABaNB=9; {
hL1q9% case VK_MENU:
*hhPCYOm MaskBits|=ALTBIT;
LL|uMe"Jb break;
qSB]Zm< case VK_CONTROL:
HLL[r0P`F MaskBits|=CTRLBIT;
=J2\"6BnzA break;
T6gugDQ~. case VK_SHIFT:
}:5_vH0 MaskBits|=SHIFTBIT;
zYCrfr break;
:[;]6; default: //judge the key and send message
1o&]=( break;
&+@~;p5F }
f`zH#{u for(int index=0;index<MAX_KEY;index++){
v8
Q/DJ~ if(hCallWnd[index]==NULL)
MIblx continue;
,/d
R if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
CdxEY {
4eZ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
[I4:R_\ bProcessed=TRUE;
[(Z sQK }
aR3R,6ec }
f}jo18z% }
{s=n "*Qp) if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
s:_M+_7_ for(int index=0;index<MAX_KEY;index++){
6`/nA4S4. if(hCallWnd[index]==NULL)
E5-f{Qc continue;
4NY00d/R if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
vx:MLmZ. SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
@8IYJ{= //lParam的意义可看MSDN中WM_KEYDOWN部分
tY?_#rc }
(7C&I-l }
gmU_# J%~ }
'S_kD! BO return CallNextHookEx( hHook, nCode, wParam, lParam );
wz!a;]agg }
wv.FL$f[@ udRum7XW3 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:
l>l)m-;O aNZJs<3;'D BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
3kAmRU BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
yv.Y-c= m!{}Y]FZn 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:
cY%[UK $l c\X0*GX LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
m7zx,bz> {
ooJ ^8L if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
$~h\8 {
x"hZOgFZ //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
4)'8fi SaveBmp();
2_^{Vez@I return FALSE;
SfKm]Z>Hp }
d>ltL`xn …… //其它处理及默认处理
1!u}~E_ }
',?9\xEB K\Oz
~,z (C<~:Y?% 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
6kW <i,A
- 1-_op!N 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
ZTCzD8 d3A= (/>D 二、编程步骤
6`sOhVD czMu<@c [ 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
bFivHms 8.Q;o+NU 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
f1cQ*#2~ %s.hqr,I 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
g+5{&YD zzf;3S? 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
k+X=8()k {`Ekv/XWa 5、 添加代码,编译运行程序。
yY,O=yOjq pdcP;. 三、程序代码
H*#L~!] Ri$wt.b ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
Qo*,2B9R L #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
JCjQR`) #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
]+1?T)<! #if _MSC_VER > 1000
6S-1Wc4 #pragma once
s?;rP,{:p #endif // _MSC_VER > 1000
. &dh7`l #ifndef __AFXWIN_H__
2o0.ttBAqZ #error include 'stdafx.h' before including this file for PCH
# 2As-9 #endif
aGK =VN}r #include "resource.h" // main symbols
_xgF?# class CHookApp : public CWinApp
ML6V,V/e {
i^c public:
K6#9HF'2I CHookApp();
7X3<8:% // Overrides
@(XX68 // ClassWizard generated virtual function overrides
&Gp~)% //{{AFX_VIRTUAL(CHookApp)
wRgh`Hc\} public:
t`b>iX%(1t virtual BOOL InitInstance();
&3x
\wH/_ virtual int ExitInstance();
cY+vnQm //}}AFX_VIRTUAL
wGd4:W //{{AFX_MSG(CHookApp)
V K/;ohTTP // NOTE - the ClassWizard will add and remove member functions here.
W~15[r0 // DO NOT EDIT what you see in these blocks of generated code !
D- )jmz>R //}}AFX_MSG
Lod$&k@@ DECLARE_MESSAGE_MAP()
q6Q;9 , };
9N(<OY+Dgm LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
hZ0p /Bdv BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
FA 1E`AdU BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
LOY+^ BOOL InitHotkey();
L8<Yk`jx BOOL UnInit();
3y!yz3E #endif
[aM_.[bf AXBv']Y //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
\cq
gCab/2 #include "stdafx.h"
3nfw:. #include "hook.h"
b6Jv|1w' #include <windowsx.h>
z/bJDSQ #ifdef _DEBUG
#u8|cs! #define new DEBUG_NEW
jr@u #undef THIS_FILE
#JAU5d static char THIS_FILE[] = __FILE__;
(bfHxkR. #endif
c5_?jKpl #define MAX_KEY 100
>G`=8Ku #define CTRLBIT 0x04
m?;aTSa #define ALTBIT 0x02
po~l8p> #define SHIFTBIT 0x01
8l|v#^v #pragma data_seg("shareddata")
7
4rmxjiN HHOOK hHook =NULL;
h1 \)_jxA UINT nHookCount =0;
S5eQHef static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
zx7*Bnu0 static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
%G9:M;|' static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
=>ooB/ static int KeyCount =0;
vF, !8e'v static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
?#@JH #pragma data_seg()
n7~!klF- HINSTANCE hins;
0mB]*<x8 void VerifyWindow();
|RqCw7 BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
{p-b,J9~a //{{AFX_MSG_MAP(CHookApp)
(5@9j // NOTE - the ClassWizard will add and remove mapping macros here.
8+Lig // DO NOT EDIT what you see in these blocks of generated code!
w7Nb+/,sg //}}AFX_MSG_MAP
.Z=D|&! END_MESSAGE_MAP()
WeGT} L]{ 1"`# CHookApp::CHookApp()
A8JEig 3Ix {
Zmf\A // TODO: add construction code here,
6[BQx)7T // Place all significant initialization in InitInstance
OZ?4"1$.t }
|;q*Zy( {Y{*(5YV CHookApp theApp;
k[oU}~*U+ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
b&u o^G, {
<Sn5ME<* BOOL bProcessed=FALSE;
azMrY< if(HC_ACTION==nCode)
3 wVN:g7 {
kq6K<e4jO if((lParam&0xc0000000)==0xc0000000){// Key up
jREj]V> switch(wParam)
qX{m7 {
6T 2jVNg case VK_MENU:
>j1\]uo MaskBits&=~ALTBIT;
i][7S mN break;
y4`<$gL case VK_CONTROL:
>So)KB MaskBits&=~CTRLBIT;
Ww*='lz break;
[T', ZLR| case VK_SHIFT:
ocwRU0+j MaskBits&=~SHIFTBIT;
R4,j break;
^.Y"<oZSS default: //judge the key and send message
>LxYP7M break;
jqHg'Fq }
X#mm
Z;P for(int index=0;index<MAX_KEY;index++){
Z(AI]wk3< if(hCallWnd[index]==NULL)
hvu>P { continue;
70 !& if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Oqzz9+ {
}9fH`C/m SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
gH-e0134% bProcessed=TRUE;
DB'pRo+U }
}Jt( H }
<Gzy*1Q& }
m`UNdFS else if((lParam&0xc000ffff)==1){ //Key down
Z~o*$tF/ switch(wParam)
k))*Sg {
'j=7'aX>K case VK_MENU:
juuBLv MaskBits|=ALTBIT;
JDVMq=ui break;
"H>L!v case VK_CONTROL:
pYV$sDlD MaskBits|=CTRLBIT;
q4vu r>m6 break;
10dVV[= case VK_SHIFT:
6~\z]LZ MaskBits|=SHIFTBIT;
UM%[UyYQ break;
cOra`7L` default: //judge the key and send message
i> Ssp break;
G~T]m . }
p~M1}mE for(int index=0;index<MAX_KEY;index++)
^GdU$%aa {
}NPF]P; if(hCallWnd[index]==NULL)
y'4H8M2? continue;
Iw~3y{\ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
]H7_bix {
8Dpf{9Y-E SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
ABEC{3fWpu bProcessed=TRUE;
W?{:HV }
}AG$E}~/ }
Lys4l$J] }
=flgKRKk.r if(!bProcessed){
y|b|_eE?{ for(int index=0;index<MAX_KEY;index++){
MrjET!`.jC if(hCallWnd[index]==NULL)
9z5K -s continue;
$DW3H1iW if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
YMP:T?vMVh SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
^a|$z$spf }
/_E:sI9( }
/h%<e }
v'*Q[
(' return CallNextHookEx( hHook, nCode, wParam, lParam );
vBsd.2t~ }
VtF^;
f }(O/ y- BOOL InitHotkey()
Ay<'Z6` {
m`
cw: if(hHook!=NULL){
dC@aQi6{6 nHookCount++;
9Qp39(l: return TRUE;
O
z%K* }
rKq/=Avv else
?_ [xpK() hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
UiS9uGj if(hHook!=NULL)
8WV1OIL nHookCount++;
a8aEZ724 return (hHook!=NULL);
qVC_K/w
7 }
&V1N
a1` BOOL UnInit()
S{j|("W"[ {
evPr~_ if(nHookCount>1){
a>`\^>G4 nHookCount--;
1d!7GrD F
return TRUE;
WZ5[tZf }
Mw7!w-1+ BOOL unhooked = UnhookWindowsHookEx(hHook);
$*K5 if(unhooked==TRUE){
vP&dvAUF nHookCount=0;
|x["fWK hHook=NULL;
=<(:5ive }
C1P{4 U return unhooked;
7P9n.
[ }
Vn? %w~0! I"@X~Y7} BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
y|q4d(P. {
-h*Yd) BOOL bAdded=FALSE;
r9@O`i for(int index=0;index<MAX_KEY;index++){
gBHev1^y if(hCallWnd[index]==0){
y4)M,+O5 hCallWnd[index]=hWnd;
FQB)rxP HotKey[index]=cKey;
BDxrS q,H HotKeyMask[index]=cMask;
2F^
%d9`
bAdded=TRUE;
;6t>!2I>C KeyCount++;
PC/fb-J break;
%f\{ ] }
GmtMA| }
2.}<VivT return bAdded;
`3kE$h# }
]R}#3(]1 Ri4_zb BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
UT [7 J {
m\7-/e2a BOOL bRemoved=FALSE;
rB?u.jn0T for(int index=0;index<MAX_KEY;index++){
E!Hq%L!/ if(hCallWnd[index]==hWnd){
xq=+M!V if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
F/ 2@%,2n hCallWnd[index]=NULL;
Km]N scq1 HotKey[index]=0;
JWy$` "{ HotKeyMask[index]=0;
1O45M/5\o bRemoved=TRUE;
I!jSAc{ KeyCount--;
M! gX4 break;
:q~qRRmjBe }
"$+naY{w }
'0X!_w6W }
w>; :mf return bRemoved;
+@]1!|@( }
n<8$_?- mLk@&WxG void VerifyWindow()
( y^oGY; {
Ol9U^ for(int i=0;i<MAX_KEY;i++){
f1=BBQY
> if(hCallWnd
!=NULL){ x`PIJE
if(!IsWindow(hCallWnd)){ 51.F,uY
hCallWnd=NULL; a\vf{2
HotKey=0; CB_(9T72H
HotKeyMask=0; :tdx:
KeyCount--; t2p/NIn
} ]~8bh*,=
} >?'q P ]
} g}Hk4+
} tzi+A;>c(v
WRh&4[G'
BOOL CHookApp::InitInstance() 0-0 )E&2
{ #"ayq,GC<
AFX_MANAGE_STATE(AfxGetStaticModuleState()); |/arxb&
hins=AfxGetInstanceHandle(); aen(Mcd3bg
InitHotkey(); 8 jqt=}b
return CWinApp::InitInstance(); 2P$l XGjh
} 0o At=S
fj0+a0h
int CHookApp::ExitInstance() i0-!!
{ j6Jz
VerifyWindow(); =t@m:
UnInit(); ~0ZEnejy
return CWinApp::ExitInstance(); D\(,:_ge
} 78+H|bH8
*IGxa
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file =d~]*[8
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ifTVTd7O
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ |rdG+>
#if _MSC_VER > 1000 eno*JK
#pragma once M =yZ5~3
#endif // _MSC_VER > 1000 $@x3<}X;
aZ@4Z=LK
class CCaptureDlg : public CDialog 2@08 V|
{ `"AjbCL
// Construction }S*6+4
public: FPaj
p
BOOL bTray; -J[zJ4z#
BOOL bRegistered; P(X#w
BOOL RegisterHotkey(); PC\Xm,,
UCHAR cKey; IS&`O=7
UCHAR cMask; 0#K@^a
void DeleteIcon(); W{ eu_
void AddIcon(); {Hp?rY@
UINT nCount; kjNA~{
void SaveBmp(); Zt lS*id_
CCaptureDlg(CWnd* pParent = NULL); // standard constructor ]|u}P2
// Dialog Data "oz@w'rG
//{{AFX_DATA(CCaptureDlg) 7;CeQx/W)W
enum { IDD = IDD_CAPTURE_DIALOG }; sB0+21'R
CComboBox m_Key; cnLC> _hY
BOOL m_bControl; =#BeAsFfO
BOOL m_bAlt; rO]C`bg
BOOL m_bShift; 1Dt"Rcn"4
CString m_Path; yp@mxI@1
CString m_Number; $k'f)E
//}}AFX_DATA 3Xd+>'H
// ClassWizard generated virtual function overrides R%#c~NOO
//{{AFX_VIRTUAL(CCaptureDlg) ?b#?Vz
public: 7IK<9i4O
virtual BOOL PreTranslateMessage(MSG* pMsg);
dZ%b|CUb
protected: *N>Qj-KAM_
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support =7e8N&-nv
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ^]U2Jd
//}}AFX_VIRTUAL !-N!80
// Implementation iS=T/<|?
protected: @;rVB
HICON m_hIcon; ykM#EyN
// Generated message map functions g,,cV+
//{{AFX_MSG(CCaptureDlg) m9L+|r
virtual BOOL OnInitDialog(); H~ks"D1
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); M<ad>M
afx_msg void OnPaint(); l$zNsf.
afx_msg HCURSOR OnQueryDragIcon(); YvYav d
virtual void OnCancel(); >F+:ej
afx_msg void OnAbout(); o8s&n3mY}y
afx_msg void OnBrowse(); `4k;`a
afx_msg void OnChange(); s{s0#g
//}}AFX_MSG V ?_%Y<|L
DECLARE_MESSAGE_MAP() LL[+QcH
}; +ixDB0"\
#endif dH`a|SVW9
>,] #~d
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ]6:5<NW
#include "stdafx.h" >p<(CVX[
#include "Capture.h" SN]/~>/
#include "CaptureDlg.h" Gi<f/xQk>
#include <windowsx.h> dt5gQ9(B
#pragma comment(lib,"hook.lib") wSAm[.1i
#ifdef _DEBUG ADR`j;2
#define new DEBUG_NEW "Q/3]hc.
#undef THIS_FILE =pk'a_P8-
static char THIS_FILE[] = __FILE__; CC)9Ks\
#endif y.O? c&!
#define IDM_SHELL WM_USER+1 r p@=
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); i44:VR|
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Z(<ul<?r
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; x _2]G'
class CAboutDlg : public CDialog 7Ru0>4B
{ ,7QnZ=F
public: ]-}a{z
CAboutDlg(); v,M2|x\r}
// Dialog Data t[Q^Xp
//{{AFX_DATA(CAboutDlg) +$UfP(XmH
enum { IDD = IDD_ABOUTBOX }; ;m5M:Z"
//}}AFX_DATA {'b8;x8h
// ClassWizard generated virtual function overrides O Z#?
//{{AFX_VIRTUAL(CAboutDlg) |hdh4P$+|
protected: :w];N|48s
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support kqyMrZ#
//}}AFX_VIRTUAL t
=*K?'ly
// Implementation Wt`D
protected: 3%P?1s
//{{AFX_MSG(CAboutDlg) "(xS[i
//}}AFX_MSG .H>Rqikj
DECLARE_MESSAGE_MAP() djSN{>S
}; Olno9_'
"~[Rwh?
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) -
a=yid
{ t]` 2f3UO
//{{AFX_DATA_INIT(CAboutDlg) q@\_q!
//}}AFX_DATA_INIT sbs"26IE
} fC-^[Af)
p;5WLAF
void CAboutDlg::DoDataExchange(CDataExchange* pDX) b9YpUm7#
{ +p[~hM6?
CDialog::DoDataExchange(pDX); JxvwquI
//{{AFX_DATA_MAP(CAboutDlg) tS9m8(Hr%Q
//}}AFX_DATA_MAP
1y@-
} H,I}R
z=fag'fzM
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) -?]ltn9!
//{{AFX_MSG_MAP(CAboutDlg) lvN{R{7>
// No message handlers W+eN%w5
//}}AFX_MSG_MAP ;+jp,( 7
END_MESSAGE_MAP() {jVFlKP>
\8$`:3,@
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) e56#Qb@$\
: CDialog(CCaptureDlg::IDD, pParent) ((5zwD
{ XgbGC*dQ
//{{AFX_DATA_INIT(CCaptureDlg) 7*5ctc!dG
m_bControl = FALSE; I,S'zHR
m_bAlt = FALSE; dL\8^L
m_bShift = FALSE; w\mF2h
m_Path = _T("c:\\"); N<{`n;
m_Number = _T("0 picture captured."); 9s!/y iP5
nCount=0; 4sAshrUf
bRegistered=FALSE; |")x1'M
bTray=FALSE; `u}x:f !
//}}AFX_DATA_INIT \1Bgs^
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 $W?XxgkB?
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); nx4aGS"F:
} \fhT#/0N
S?{5DxilO
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ep?0@5D}]
{ xHGoCFB
CDialog::DoDataExchange(pDX); 3dbf!
//{{AFX_DATA_MAP(CCaptureDlg) VZ,T`8"
DDX_Control(pDX, IDC_KEY, m_Key); gfYB|VyWo
DDX_Check(pDX, IDC_CONTROL, m_bControl); 3/AUV%+
DDX_Check(pDX, IDC_ALT, m_bAlt); .$k"+E
DDX_Check(pDX, IDC_SHIFT, m_bShift); ZFON]$Zk
DDX_Text(pDX, IDC_PATH, m_Path); IBqY$K+l
DDX_Text(pDX, IDC_NUMBER, m_Number); /OP*ARoC21
//}}AFX_DATA_MAP 'l:2R,cP
} Cm4*sN.&)
A1q^E(}O
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) P&GZe/6Y
//{{AFX_MSG_MAP(CCaptureDlg)
p4t)Z#0
ON_WM_SYSCOMMAND() sfV.X:ev
ON_WM_PAINT()
=l(JJ
ON_WM_QUERYDRAGICON() *p3P\ H^5
ON_BN_CLICKED(ID_ABOUT, OnAbout) SSXS
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) d0B+syl&4l
ON_BN_CLICKED(ID_CHANGE, OnChange) A|J\X=5
//}}AFX_MSG_MAP OGFKc#
END_MESSAGE_MAP() k~R[5W|'
[FL I+;gY
BOOL CCaptureDlg::OnInitDialog() ,
.I^ekF
{ 2UF94
CDialog::OnInitDialog(); =#tQIhX`
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); DS C4
ASSERT(IDM_ABOUTBOX < 0xF000); ]Yg EnZ
CMenu* pSysMenu = GetSystemMenu(FALSE); 5avO48;Vc
if (pSysMenu != NULL)
u\xm8}A
{ @9h#o5y q
CString strAboutMenu; !`_f\
strAboutMenu.LoadString(IDS_ABOUTBOX); =dBrmMh
if (!strAboutMenu.IsEmpty()) HWhKX:`l
{ [S:)UvB
pSysMenu->AppendMenu(MF_SEPARATOR); {*U:Wm<
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); cnthtv+(~
} 9ojhI=:
} gcxk'd
SetIcon(m_hIcon, TRUE); // Set big icon dmz3O(]$
SetIcon(m_hIcon, FALSE); // Set small icon YZl%JX
m_Key.SetCurSel(0); ,7P^]V1
RegisterHotkey(); !P$xh
CMenu* pMenu=GetSystemMenu(FALSE); \2pFFVT
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); dLf8w>i`T
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); tTH%YtG
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Y2-bU 7mo
return TRUE; // return TRUE unless you set the focus to a control >n~p1: $
} Aa>gN
S=p u
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 7Ca\ (82
{ cEdJn@ ,
if ((nID & 0xFFF0) == IDM_ABOUTBOX) 3.X0!M;x
{ qJU)d
CAboutDlg dlgAbout; YSo7~^1W"
dlgAbout.DoModal(); # &83;uys
} .,Qnn}:l
else F5+_p@!i
{ g i'agB^
CDialog::OnSysCommand(nID, lParam); A#S:_d
} <UJJ],)^1A
} 7[BL 1HI*
]?(F'&
void CCaptureDlg::OnPaint() n-3j$x1Ne
{ wG5RN;`V
if (IsIconic()) kA!(}wRL
{ K<6x4ha
CPaintDC dc(this); // device context for painting 5iddB $
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 2nkj;x{H$
// Center icon in client rectangle EAw#$Aq=
int cxIcon = GetSystemMetrics(SM_CXICON); *t{c}Y&@
int cyIcon = GetSystemMetrics(SM_CYICON); Pki4wDCTW
CRect rect; "GI&S% F
GetClientRect(&rect); V2{#<d-T!
int x = (rect.Width() - cxIcon + 1) / 2; 4oV_b"xz~
int y = (rect.Height() - cyIcon + 1) / 2; &hN&nH"PC
// Draw the icon Tki/d\!+
dc.DrawIcon(x, y, m_hIcon); ~88 Tz+
} %8CT -mQ
else ^r*%BUU9]%
{ nFnF_
CDialog::OnPaint(); VhFRh,J(T
} =veOVv[Q&/
} m}[~A@qD
N5s|a5
HCURSOR CCaptureDlg::OnQueryDragIcon() /Jf`x>eiH
{ v7FRTrqjj
return (HCURSOR) m_hIcon; |vN@2h(|"
} 8UT%:DlxQ
F[D0x26^
void CCaptureDlg::OnCancel() XYHCggy
{ >Y-TwDaE
if(bTray) 2~WFLD
DeleteIcon(); I.+)sB?5
CDialog::OnCancel(); ClMtl59
} *C@[5#CA2z
iW1ih QX
void CCaptureDlg::OnAbout() A?D"j7JD=L
{ 0t COb9
CAboutDlg dlg; .(7C)P{.0
dlg.DoModal(); ix7
e])m(
} j22#Bw
`3y!XET
void CCaptureDlg::OnBrowse() (_qBsng:
{ gSr}p$N
CString str; uxC
BROWSEINFO bi; bq3fiT9
char name[MAX_PATH]; BQ9`DYI b
ZeroMemory(&bi,sizeof(BROWSEINFO)); bI]UO)
bi.hwndOwner=GetSafeHwnd(); Mj
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bi.pszDisplayName=name; )n}]]^Sc
bi.lpszTitle="Select folder"; 4ZJT[zi
bi.ulFlags=BIF_RETURNONLYFSDIRS; )yNw2+ ~5
LPITEMIDLIST idl=SHBrowseForFolder(&bi); >}DjHLTW\
if(idl==NULL) ~"q,<t
return; c >
mu)('U
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); frmqBC VJ:
str.ReleaseBuffer(); {8#N7(%z
m_Path=str; `+hy#1]
if(str.GetAt(str.GetLength()-1)!='\\') Md>f
m_Path+="\\"; `}9 1S
UpdateData(FALSE); ra%R:xX
} B2G5hbaA
+# RlX3P
void CCaptureDlg::SaveBmp() cl8_rt
{ 3W-NS~y
CDC dc; 5G'&9{oB
dc.CreateDC("DISPLAY",NULL,NULL,NULL); 9U7Mu;4
CBitmap bm; /%uZKGP
int Width=GetSystemMetrics(SM_CXSCREEN); c. TB8Ol
int Height=GetSystemMetrics(SM_CYSCREEN); /;<e.
bm.CreateCompatibleBitmap(&dc,Width,Height); _7=pw5[
CDC tdc; J[<pZ
[
tdc.CreateCompatibleDC(&dc); WE 5"A|
=
CBitmap*pOld=tdc.SelectObject(&bm); "6E1W,|{
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); loeLj4""
tdc.SelectObject(pOld); _)#=>$k\
BITMAP btm; O,=Q1*c,&
bm.GetBitmap(&btm); (I7&8$Zl
DWORD size=btm.bmWidthBytes*btm.bmHeight; DO1 JPeIi
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); xMSNrOc
BITMAPINFOHEADER bih; yL;o{
G
bih.biBitCount=btm.bmBitsPixel; V5yxQb
bih.biClrImportant=0; vfJ3idvo*w
bih.biClrUsed=0; oDW<e'Jm
bih.biCompression=0; I(^jOgYU
bih.biHeight=btm.bmHeight; d4p{5F7]^
bih.biPlanes=1; ^A11h6I
bih.biSize=sizeof(BITMAPINFOHEADER); u+z .J4w
bih.biSizeImage=size; K=m9H=IX~T
bih.biWidth=btm.bmWidth; q!hy;K`Jd
bih.biXPelsPerMeter=0; ''(fH$pY
bih.biYPelsPerMeter=0; v?YdLR
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); e7XsyL'|p
static int filecount=0; |D;"D
CString name; ZSF=
name.Format("pict%04d.bmp",filecount++); hy$MV3LP
name=m_Path+name; z;bH<cQ
BITMAPFILEHEADER bfh; ~'^!udF-
bfh.bfReserved1=bfh.bfReserved2=0; l&6U|q`
bfh.bfType=((WORD)('M'<< 8)|'B'); `R=a@DQ
bfh.bfSize=54+size; {DEzuU
bfh.bfOffBits=54; wRXn9
CFile bf; t<!+b@l5
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ YQ 8j
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); mJ8{lXq3!
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); {t844La"
bf.WriteHuge(lpData,size); bmj8WZ
bf.Close(); /<(*/P,>
nCount++; y:g7'+c
} x{NNx:T1
GlobalFreePtr(lpData); + ZR(
if(nCount==1) ^MW\t4pZ
m_Number.Format("%d picture captured.",nCount); ,bZ"8Z"lss
else +CnyK(V
m_Number.Format("%d pictures captured.",nCount); |D;_:x9
UpdateData(FALSE); HA^jk%53
} U^M@um M
E8T"{
R80
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) !j!Z%]7
{ )(h&Q?
Ar
if(pMsg -> message == WM_KEYDOWN) %~#!NX
{ r{K\(UT]!
if(pMsg -> wParam == VK_ESCAPE) Y<p zy8z
return TRUE; pu/m8
if(pMsg -> wParam == VK_RETURN) F=oHl@
return TRUE; WF ?/GN
} T!u'V'Ei2
return CDialog::PreTranslateMessage(pMsg); zW"~YaO%C
} a.
h?4+^bN
xa87xX=a
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) o &BPG@n
{ OW+ e_im}
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ QD$}-D[
SaveBmp(); [c&2i`C
return FALSE; x @1px&^
} tWpl`HH
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ RGT_}ni
CMenu pop; 8w)e/*:j
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ? .c?Pu
CMenu*pMenu=pop.GetSubMenu(0); 8ivRp<9
pMenu->SetDefaultItem(ID_EXITICON); Xtci0eS#V
CPoint pt; )^t!|*1LA
GetCursorPos(&pt); Ms.PO{wb
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); R#Y50hzT
if(id==ID_EXITICON) IXGW2z;
DeleteIcon(); [ 3$.*
else if(id==ID_EXIT) tO?21?AD D
OnCancel(); \e?.hmq
return FALSE; w) =eMdj\o
} f!5F]qP>-
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ;EK(b
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) yB-.sGu
AddIcon();
n=f`AmF;
return res; iKg75%;t
} "#*Nnt
X3P&"}a
void CCaptureDlg::AddIcon() Px'R`1^
{ !+m@AQ:,
NOTIFYICONDATA data; ~k9O5S{
data.cbSize=sizeof(NOTIFYICONDATA); jmkRP"ZnA
CString tip; C=>B_EO
tip.LoadString(IDS_ICONTIP); q&u$0XmV
data.hIcon=GetIcon(0); qovQ9O
data.hWnd=GetSafeHwnd(); $ I#7dJ"*
strcpy(data.szTip,tip); ^fkCyE;=
data.uCallbackMessage=IDM_SHELL; M6# \na
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 'b8R#R\P
data.uID=98; KuA>"X
Shell_NotifyIcon(NIM_ADD,&data); M[A-1]'
ShowWindow(SW_HIDE); Oc7 >S.1
bTray=TRUE; 3"5.eZSOW
} a*V9_Px$&
g<fP:/
void CCaptureDlg::DeleteIcon() Uf# PoQ!y
{ 'KSa8;:=C
NOTIFYICONDATA data; T'hml
data.cbSize=sizeof(NOTIFYICONDATA); P?uf?{
data.hWnd=GetSafeHwnd(); 8|w-XR
data.uID=98; }.'Z=yy
Shell_NotifyIcon(NIM_DELETE,&data); O'fk&&l
ShowWindow(SW_SHOW); |-|jf
SetForegroundWindow(); "hW(S
ShowWindow(SW_SHOWNORMAL); Z,3 CC \
bTray=FALSE; ;vMn/
} .
=&Jo9
6A}eSG3
void CCaptureDlg::OnChange() d;{y`4p)s
{ (/'h4KS@
RegisterHotkey();
KZ]r8
} .%_)*NUZ
$)Wb#B
BOOL CCaptureDlg::RegisterHotkey() @\ }sb]
{ TfL4_IAG.
UpdateData(); X&s7%]n+
UCHAR mask=0; 3:UA<&=s
UCHAR key=0; ^b=XV&{q
if(m_bControl) [KMS<4t'
mask|=4; C(s\LI!r
if(m_bAlt) l1}R2lSEO
mask|=2; jA,|JgN|n
if(m_bShift) )i @1XH"D
mask|=1; L.kD,'G}>
key=Key_Table[m_Key.GetCurSel()]; yOc|*O=]U
if(bRegistered){ Fqo&3+J4
DeleteHotkey(GetSafeHwnd(),cKey,cMask); J2'K?|,m
bRegistered=FALSE; QskUdzQ=
} i (0hvV>'
cMask=mask; BH5w@
cKey=key; prUHjS
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 85}
ii{S
return bRegistered; Bq *[c=(2
} q8/ihA6:
ms7SoYbSu
四、小结 IQIbz{bMx
R3?:\d{
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。