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:
sdBB(
qm6 X5T 一、实现方法
KjK-#F,@ iBk1QRdn 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:
#'5{
?Cb /pWKV>tjj #pragma data_seg("shareddata")
h,ipQ> HHOOK hHook =NULL; //钩子句柄
CsJ&,(s( UINT nHookCount =0; //挂接的程序数目
Q"QZ^!zRl static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
98*C/=^TH{ static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
6lm<>#_ static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
moCR64n static int KeyCount =0;
M Al4g+es static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
YRyaOrl$< #pragma data_seg()
skF}_ '3=@UBs 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。
a(AYY<g /<k]mY cu 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:
m>f8RBp]' +ZR>ul-c BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
ojx2[a\ cKey,UCHAR cMask)
~{ucr#]C {
FK@Gd)( BOOL bAdded=FALSE;
1 fTf+P for(int index=0;index<MAX_KEY;index++){
;NF:98 if(hCallWnd[index]==0){
ZU;nXqjc hCallWnd[index]=hWnd;
tu^C<MV HotKey[index]=cKey;
G5NAwpZf HotKeyMask[index]=cMask;
Ry40:;MYN bAdded=TRUE;
$lg{J$
h8 KeyCount++;
A}[x))r break;
y\=^pla }
s)#TT9BbV }
U
U3o (Yq return bAdded;
<=!FB8 . }
"%w E>E //删除热键
L|p+;ex BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
EUbyQL {
Bo;{ QoB BOOL bRemoved=FALSE;
E-deXY for(int index=0;index<MAX_KEY;index++){
\F14]`i if(hCallWnd[index]==hWnd){
-d[Gy-
J if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
13A~."b hCallWnd[index]=NULL;
jd.w7.8 HotKey[index]=0;
=
O|}R HotKeyMask[index]=0;
Yv3P]6c. bRemoved=TRUE;
!$p E=~1C KeyCount--;
%zN~%mJG break;
A]MX^eY }
M4e8PRlI }
,4r 4 < }
z8j7K'vV1 return bRemoved;
PnH5[4&k }
L-Mf{z |Y30B,=M ^nLk{<D35 DLL中的钩子函数如下:
~&WBA]w'+ \eXuNv_ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
q!WiX|P {
Hq|{Nt%Q BOOL bProcessed=FALSE;
@[#)zO if(HC_ACTION==nCode)
t')%;N {
>VJ"e` if((lParam&0xc0000000)==0xc0000000){// 有键松开
\"9ysePI switch(wParam)
CYdYa| {
6M[OEI5 case VK_MENU:
Bqw/\Lxwlf MaskBits&=~ALTBIT;
SP4(yJy& break;
P&Wf.qr{: case VK_CONTROL:
SmV}Wf MaskBits&=~CTRLBIT;
'jYKfq~_cJ break;
nq\~`vH|Gd case VK_SHIFT:
xu@+b~C\ MaskBits&=~SHIFTBIT;
vBV_aB1{ break;
MC1&X' default: //judge the key and send message
@DKph!cr break;
x??H%'rP }
p-h(C'PqF for(int index=0;index<MAX_KEY;index++){
#e[igxwi if(hCallWnd[index]==NULL)
Jm 1n|f continue;
HMw}pp: if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
gRwRhA/ {
lr=quWDY SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
cHJ4[x= bProcessed=TRUE;
Y8/&1s_ }
u6
4{w, }
2>)::9e4 }
P}vk5o' else if((lParam&0xc000ffff)==1){ //有键按下
,Y@4d79 switch(wParam)
/5~j"|
U' {
G1:"Gxja case VK_MENU:
K<v:RbU|[1 MaskBits|=ALTBIT;
T+>W(w
i break;
@Py?.H case VK_CONTROL:
w}U'>fj MaskBits|=CTRLBIT;
cRSgP{hy break;
a[J_H$6H! case VK_SHIFT:
<FwAV=}6p MaskBits|=SHIFTBIT;
"YN6o_*] break;
A",R2d default: //judge the key and send message
Ci?RuZ" break;
" t,ZO }
,D' bIk for(int index=0;index<MAX_KEY;index++){
fz%e?@>q if(hCallWnd[index]==NULL)
9
xFX"_J continue;
AbB+<0 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
[6%y RQ_ {
?+L7Bd(EF% SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
[jTZxH< bProcessed=TRUE;
)Mh5q&ow }
{"_V,HmEF+ }
Is!+`[ma }
7TA&u' if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
ckbD/+ for(int index=0;index<MAX_KEY;index++){
,S1'SCwVdJ if(hCallWnd[index]==NULL)
7e H j"_; continue;
G5UNW<P2C if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
v %S$5 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
-pQ0,/}K //lParam的意义可看MSDN中WM_KEYDOWN部分
pEY zB; }
=91f26c!~ }
|&~);>Cq2 }
wvH*<,8Vq return CallNextHookEx( hHook, nCode, wParam, lParam );
'&Tz8.jp~ }
~/!jKH7`j 7lAn GP.; 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
q5.5%W \7Fp@ .S3 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
5Z[HlN|-! BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
"F?p Y@4 |al'_s}I 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
:!fU+2$`^( W\O.[7JP LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
*7C l1o {
6G:7r [ if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
;JX2ebx {
$Q`\- //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
VW:Voc SaveBmp();
>|hqt8lY return FALSE;
2lxA/.f }
Rc}#4pM8 …… //其它处理及默认处理
3#idXc }
Bb7Vf7>
gh%Q9Ni- UM. Se(kS 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。
@Z89cTO o3.b='HAm 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。
BUXlHh%<R L]=LY 二、编程步骤
N._^\FRyn "SpsSQ 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";
[L?WM>]% V QbKrnX 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
/Mw0<# FwDEYG 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;
.FvIT]k- <\L=F8[ 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;
LF!S`|FF MYUL y2) 5、 添加代码,编译运行程序。
dDqT#N?Y z*WQ=l2 三、程序代码
XpdjWLO]C< $~T|v7Y% ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
SKJ'6*6 #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
xsg55` #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
kj`h{Wc[) #if _MSC_VER > 1000
K?=g
IC: #pragma once
1fV\84m^ #endif // _MSC_VER > 1000
oi%IHX(` #ifndef __AFXWIN_H__
xgWVxX^) #error include 'stdafx.h' before including this file for PCH
LHq*E` #endif
t=n@<1d #include "resource.h" // main symbols
f4^\iZ{`G class CHookApp : public CWinApp
{QT:1U\. {
s+a#x(7{ public:
tS[@?qP CHookApp();
%D[6;PT // Overrides
w=ZK=@ // ClassWizard generated virtual function overrides
+\Je
B/F //{{AFX_VIRTUAL(CHookApp)
j`-9. public:
0fx.n virtual BOOL InitInstance();
kQ .3J.Q5 virtual int ExitInstance();
1P/4,D@ //}}AFX_VIRTUAL
+P=I4-?eX //{{AFX_MSG(CHookApp)
qhNYQ/uS // NOTE - the ClassWizard will add and remove member functions here.
/z4n?&tM // DO NOT EDIT what you see in these blocks of generated code !
3EyVoS6D //}}AFX_MSG
m"vWu0/# DECLARE_MESSAGE_MAP()
BSg3 };
}1YQ?:@ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
nb(Od,L BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
y&2O)z!B BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
gm}zF%B" BOOL InitHotkey();
6"V86b0)h} BOOL UnInit();
z_87;y;= #endif
Uy$?B"Z 0lpUn74F //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
{Lvta4}7( #include "stdafx.h"
yu=(m~KX
#include "hook.h"
f6%7:B d #include <windowsx.h>
D=~3N #ifdef _DEBUG
S{JBV@@tC #define new DEBUG_NEW
-nk0Q_7N #undef THIS_FILE
p;LF-R static char THIS_FILE[] = __FILE__;
:JzJ(q/ #endif
2%@<A #define MAX_KEY 100
@;{iCVW #define CTRLBIT 0x04
g;!,2,De} #define ALTBIT 0x02
L_fiE3G|> #define SHIFTBIT 0x01
X1GM\*BE #pragma data_seg("shareddata")
nY_+V{F HHOOK hHook =NULL;
>\>!Q V1@ UINT nHookCount =0;
ljjnqQ% static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
>>0c)uC|W static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
}E\u2] static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
TuzH'F static int KeyCount =0;
;h7O_|<% static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
E^t}p[s #pragma data_seg()
2$?j'i! HINSTANCE hins;
Ve4@^Jy; void VerifyWindow();
+<n8O~h BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
qr?RU .W //{{AFX_MSG_MAP(CHookApp)
F vHd` // NOTE - the ClassWizard will add and remove mapping macros here.
H)i%\7F5 // DO NOT EDIT what you see in these blocks of generated code!
>FReGiK$T //}}AFX_MSG_MAP
q%MLj./?[ END_MESSAGE_MAP()
$(;0;!t. ,%,.c^- CHookApp::CHookApp()
9C\@10 D {
Xldz&&@ // TODO: add construction code here,
yUu+68Z6 // Place all significant initialization in InitInstance
IoWK 8x }
ehQ~+x @'FO M CHookApp theApp;
/7Ft1f LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
r r(UE {
JAI ;7 BOOL bProcessed=FALSE;
q%k _C0 if(HC_ACTION==nCode)
hB-<GGcO < {
9d&}CZr if((lParam&0xc0000000)==0xc0000000){// Key up
j'|`:^
Sy switch(wParam)
`Qo}4nuRs {
4AuJ1Z case VK_MENU:
<k-hRs2d MaskBits&=~ALTBIT;
$|}PL[aA# break;
}B2qtb3 case VK_CONTROL:
|BA<> WE MaskBits&=~CTRLBIT;
>y
iE} break;
kB;!EuL case VK_SHIFT:
of?0 y-LT% MaskBits&=~SHIFTBIT;
FY <77i break;
xi"Ug41) default: //judge the key and send message
W&Kjh|[1QZ break;
1TL~I-G&n }
N1u2=puJY for(int index=0;index<MAX_KEY;index++){
ah0 if(hCallWnd[index]==NULL)
"QCVi R continue;
y7Y g$)sL if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
%B-m- =gz {
f`8mES'gc8 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
"SN+ ^` bProcessed=TRUE;
VtJyE} }
HDT-f9%}<4 }
D^\2a;[AxA }
a1#
'uS9W else if((lParam&0xc000ffff)==1){ //Key down
;U$EM+9 switch(wParam)
Ems0"e {
2~2j?\AEd. case VK_MENU:
y,=TB[d# MaskBits|=ALTBIT;
f2RIOL, break;
uM('R;<^ case VK_CONTROL:
?FwjbG< MaskBits|=CTRLBIT;
Af7&;8pM break;
M]M(E) *5 case VK_SHIFT:
wT-@v,$ MaskBits|=SHIFTBIT;
@2)ImgK[ break;
^Ts8nOGMh default: //judge the key and send message
J9yB'yE8 break;
dX5|A_Ex }
9U~sRj=D for(int index=0;index<MAX_KEY;index++)
vP{;'R {
9aZ^m$tAt if(hCallWnd[index]==NULL)
}uk]1M2= continue;
lF.yQ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
;B@-RfP {
,]|*~dd>G SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
xl;0&/7e bProcessed=TRUE;
c %.vI }
\h 1 T/_4 }
My JG2C#R }
6pY<,7t0 if(!bProcessed){
Y'v;!11#
for(int index=0;index<MAX_KEY;index++){
D'3. T{*rH if(hCallWnd[index]==NULL)
R3Ka^l8R| continue;
< .B^\X$ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
_=;lt O SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
Ug,23 }
zV"oB9\9O }
,?zOJ,wl }
Z@bGLS return CallNextHookEx( hHook, nCode, wParam, lParam );
&u7oa }
\]+57^8r N(BCe\FV BOOL InitHotkey()
#Ez+1 {
cWNWgdk,`V if(hHook!=NULL){
Qv>rww] nHookCount++;
IYk^eG:; return TRUE;
K5SP8<. }
;IX*4E'4s else
Z* L{; hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
H{nYZOf/ if(hHook!=NULL)
UAq%Y8KA nHookCount++;
^NPbD<~Lb return (hHook!=NULL);
H.8Vm[W }
d65t"U BOOL UnInit()
hpOUz% {
"[BDa}Il if(nHookCount>1){
Kk_h&by? nHookCount--;
}MV=I$S2U return TRUE;
Ar VNynQ }
A/#Xr BOOL unhooked = UnhookWindowsHookEx(hHook);
sCE2 F_xjL if(unhooked==TRUE){
-!b@\= nHookCount=0;
@CU~3Md* hHook=NULL;
y:3d`E4Xw }
%:WM]dc return unhooked;
'4}c1F1T_ }
CiSl0 Yab=p
9V;; BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
j}$Up7pW
{
wz(D
}N5 BOOL bAdded=FALSE;
~M4@hG! for(int index=0;index<MAX_KEY;index++){
V9Gk``F<RZ if(hCallWnd[index]==0){
a4L0Itrp hCallWnd[index]=hWnd;
pRLs*/Bw HotKey[index]=cKey;
lSk<euCYs HotKeyMask[index]=cMask;
czv )D\* bAdded=TRUE;
--9Z KeyCount++;
Nu%:7 break;
hfuGCD6F` }
c@1q8, }
@ dF]X return bAdded;
g2'Q)w }
t[-0/-4 HAr_z@#E BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
}.R].4gT {
<7%4= BOOL bRemoved=FALSE;
p~xrl jP$ for(int index=0;index<MAX_KEY;index++){
:xP$iEA`G if(hCallWnd[index]==hWnd){
w(xRL#% if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
5Si\hk:o hCallWnd[index]=NULL;
'o*:~n HotKey[index]=0;
_noQk3N HotKeyMask[index]=0;
\"u3x.! bRemoved=TRUE;
f!"Y"g:@E KeyCount--;
Ft)Z'&L
break;
_%$(D"^j }
ef;Ta|# }
ttK`*Ng }
BLvI[b|3gn return bRemoved;
r\-25F<e5 }
hIr$^% yw(E} void VerifyWindow()
k v}<u {
KtFxG6a for(int i=0;i<MAX_KEY;i++){
S"z cSkF if(hCallWnd
!=NULL){ ]$vJK
if(!IsWindow(hCallWnd)){ N3`W%ws`~
hCallWnd=NULL; P6E=*^^m(
HotKey=0; *KXg;777
HotKeyMask=0; M:~/e8Xv
KeyCount--; /<s$Am
} 6!3Jr
} I:qfB2tL)O
} n6a*|rE
} 426)H_wx
8zRb)B+
BOOL CHookApp::InitInstance() %ycCNS
{ :~2An-V
AFX_MANAGE_STATE(AfxGetStaticModuleState()); "k${5wk#Fl
hins=AfxGetInstanceHandle(); [?$|
InitHotkey(); Gkr^uXNg#
return CWinApp::InitInstance(); ?"aj&,q+
} iZy`5
/Lc=
K<
int CHookApp::ExitInstance() 2z\4?HJy
{ 7Pc0|Z/
VerifyWindow(); w$5N6
UnInit(); {xC CUU
return CWinApp::ExitInstance(); 'ZHu=UT7_
} WR*|kh
Hhbf9)
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ikGH:{
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) $DfaW3bJ
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ J\%<.S>
#if _MSC_VER > 1000 V+dfV`*k
#pragma once Ur626}
#endif // _MSC_VER > 1000 4R U1tWQ%
8O]U&A@
class CCaptureDlg : public CDialog a9E!2o+,
{ t|X |67W
// Construction sJlX]\RLQ
public: mF>CH]k3
BOOL bTray; FNDLqf!j
BOOL bRegistered; sQA{[l!aj
BOOL RegisterHotkey(); {1GW,T!#
UCHAR cKey; 9rb/h kX&
UCHAR cMask; .'SXRrn&:C
void DeleteIcon(); 3_atv'I
void AddIcon(); 4Pljyq:
UINT nCount; ."Yub];H
void SaveBmp(); xrT_ro8
CCaptureDlg(CWnd* pParent = NULL); // standard constructor j}R4mh
// Dialog Data JXlFo3<
//{{AFX_DATA(CCaptureDlg) v`hv5wQ
enum { IDD = IDD_CAPTURE_DIALOG }; c4LBlLv4
CComboBox m_Key; e^@/Bm+B
BOOL m_bControl; WRAW%?$
BOOL m_bAlt; UZdE^Q[
BOOL m_bShift; 9xg_M=72
CString m_Path; 2`* %NJ
CString m_Number; x~GV#c
//}}AFX_DATA ED/-,>[f
// ClassWizard generated virtual function overrides tji,by#E/%
//{{AFX_VIRTUAL(CCaptureDlg) !dLz ?0
public: mm=Y(G[_%y
virtual BOOL PreTranslateMessage(MSG* pMsg); J1<fE(X
protected: JXeqVKF
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support YF{K9M!
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); e76@-fg
//}}AFX_VIRTUAL ![5<\
// Implementation UBRMV
s
protected: (Df<QC`0v
HICON m_hIcon; bq4H4?j
// Generated message map functions 'w%N(N tq
//{{AFX_MSG(CCaptureDlg) JMOP/]%D
virtual BOOL OnInitDialog(); 7/vr!tbL`p
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ?E2k]y6<
afx_msg void OnPaint(); ^BM/K&7^
afx_msg HCURSOR OnQueryDragIcon(); w c%
virtual void OnCancel(); ](0Vm_es
afx_msg void OnAbout(); x#0C+cU
afx_msg void OnBrowse(); 2al~`
afx_msg void OnChange(); x=B+FIJ
//}}AFX_MSG )
Q=G&
DECLARE_MESSAGE_MAP() GxZQ{
\
}; *vhm
#endif LbR/it'}
RQ,(?I*8\
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file >`NY[Mn
#include "stdafx.h" b=T+#Jb
#include "Capture.h" VP 4t~$"
#include "CaptureDlg.h" |->y'V
#include <windowsx.h> p2~Q
#pragma comment(lib,"hook.lib") &SN$D5U'
#ifdef _DEBUG (P#2Am$
#define new DEBUG_NEW i`]M2Q
#undef THIS_FILE ,:\2Lf
static char THIS_FILE[] = __FILE__; ;(0:6P8I
#endif ;D8Nya>%
#define IDM_SHELL WM_USER+1 l*Y~h3
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 0HD1Ob^@
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 5,AQ~_,'\
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ,f?#i%EF&
class CAboutDlg : public CDialog Ql*/{#$
{ z3*G(,
public: Y0B*.H
Ae
CAboutDlg(); mFF]d
// Dialog Data 3/rvSR!
//{{AFX_DATA(CAboutDlg) IVNNiNN*5
enum { IDD = IDD_ABOUTBOX }; paBGJ~{=
//}}AFX_DATA CJKH"'u3^
// ClassWizard generated virtual function overrides Z `\7B e
//{{AFX_VIRTUAL(CAboutDlg) ^}1RDdQ"U
protected: oh@r0`J]x
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support RO.(k!J .
//}}AFX_VIRTUAL vWkKNB
// Implementation "(efd~.]
protected: x#8=drh.:C
//{{AFX_MSG(CAboutDlg) 4\ OELU
//}}AFX_MSG Ok`U*j
DECLARE_MESSAGE_MAP() )vU{JY;
}; Ic=V:
H+5]3>O-$
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) aY:(0en]&
{ f,L
//{{AFX_DATA_INIT(CAboutDlg) +~fu-%,k
//}}AFX_DATA_INIT M.8!BB7\8e
} w|nVK9.
EhFhL4Xdn
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 93WYZNpX
{ dY-a,ch"8p
CDialog::DoDataExchange(pDX); {hg$?4IyQ
//{{AFX_DATA_MAP(CAboutDlg) >A,WXzAK}S
//}}AFX_DATA_MAP 3N*Shzusbt
} G>RYQ{O
C(0Iv[~y/
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 17i^|&J6}:
//{{AFX_MSG_MAP(CAboutDlg) =hs@W)-O
// No message handlers PRz oLzr
//}}AFX_MSG_MAP %xZ.+Ff%
END_MESSAGE_MAP() F{"%ey">
kN$70N7I;
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) >(*jbL]p
: CDialog(CCaptureDlg::IDD, pParent) f<;9q?0V F
{ -KNJCcBJ
//{{AFX_DATA_INIT(CCaptureDlg) a;S^<8
m_bControl = FALSE; twu6z5<!-=
m_bAlt = FALSE; ppnj.tLz;r
m_bShift = FALSE; p 5o;Rvr
m_Path = _T("c:\\"); KFs` u6
m_Number = _T("0 picture captured."); Q~@8t"P
nCount=0; }[DAk~
bRegistered=FALSE; G2^DukK.
bTray=FALSE; VDPN1+1*
//}}AFX_DATA_INIT U KJY.W!w4
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Q]7Q
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 2DC#PX)i
} 3
#wj-
;p_X7N
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) !xc7~D@om(
{ y^A$bTQq
CDialog::DoDataExchange(pDX); ;Pa(nUE@
//{{AFX_DATA_MAP(CCaptureDlg) *=7[Ip<X
DDX_Control(pDX, IDC_KEY, m_Key); ~/x42|t
DDX_Check(pDX, IDC_CONTROL, m_bControl); P&tK}Se^V
DDX_Check(pDX, IDC_ALT, m_bAlt); )g --=w3
DDX_Check(pDX, IDC_SHIFT, m_bShift); aOD"z7}U
DDX_Text(pDX, IDC_PATH, m_Path); VxFy[rP
DDX_Text(pDX, IDC_NUMBER, m_Number); ``<1Lo@
//}}AFX_DATA_MAP ^"l$p,P+
} Qm.kXlsDI
[]]3"n
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) @
tIB'|O
//{{AFX_MSG_MAP(CCaptureDlg) `@eH4}L*
ON_WM_SYSCOMMAND() (
7?%Hg
ON_WM_PAINT() 9>#|~P&FE
ON_WM_QUERYDRAGICON() % KA/
ON_BN_CLICKED(ID_ABOUT, OnAbout) 3-R3Qlr
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) gCJ'wv)6|%
ON_BN_CLICKED(ID_CHANGE, OnChange) yn#h$o<
//}}AFX_MSG_MAP A%PPG+IfA
END_MESSAGE_MAP() u7=[~l&L
'JMa2/7CG
BOOL CCaptureDlg::OnInitDialog() $aA.d^
{ K(d!0S
CDialog::OnInitDialog(); *[5
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); tAA7
ASSERT(IDM_ABOUTBOX < 0xF000); ]2(c$R
CMenu* pSysMenu = GetSystemMenu(FALSE); cBI)?
if (pSysMenu != NULL) yx2.7h3
{ }SV3PdE
CString strAboutMenu; v/czW\z
strAboutMenu.LoadString(IDS_ABOUTBOX); fI1;&{f
if (!strAboutMenu.IsEmpty()) DOerSh_0W
{ zFtGc
pSysMenu->AppendMenu(MF_SEPARATOR); OVyy}1Hx
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 88>Uu!M=f
} 1955(:I
} JLu0;XVK
SetIcon(m_hIcon, TRUE); // Set big icon Ln_l>X6j51
SetIcon(m_hIcon, FALSE); // Set small icon ^PQV3\N
m_Key.SetCurSel(0); _")h
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RegisterHotkey(); |&Pl 4P
CMenu* pMenu=GetSystemMenu(FALSE); OD]J@m
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); BB.TrQM.#
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); a+/|O*>#
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); X6.O;
return TRUE; // return TRUE unless you set the focus to a control :xPvEK[B7
} TyWy5J<
:+
]uvbQ.l_t
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) r(i)9RI+(
{ 4c=kT@=jX
if ((nID & 0xFFF0) == IDM_ABOUTBOX) (@E#O$'
{ "Cc"y* P
CAboutDlg dlgAbout; S7a6ntei
dlgAbout.DoModal(); C):d9OI?
} y^=oYL
else *?D2gaCta
{ 5S]P#8
CDialog::OnSysCommand(nID, lParam); `5-#M/J
} FA9e(Ha
} w.aFaR)04
h!K2F~i{P
void CCaptureDlg::OnPaint() ['emP1g~
{ %h"<
IA
S.
if (IsIconic()) ({KAh?
{ dCP Tpm
CPaintDC dc(this); // device context for painting qm=F6*@}
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 0xUj#)
// Center icon in client rectangle @izi2ND
int cxIcon = GetSystemMetrics(SM_CXICON); Q)BoWd
int cyIcon = GetSystemMetrics(SM_CYICON); 4p8jV*:@{
CRect rect; f*vk1dS:*3
GetClientRect(&rect); mzB#O;3=
int x = (rect.Width() - cxIcon + 1) / 2; pqN[G=0
int y = (rect.Height() - cyIcon + 1) / 2; uS#Cb+*F
// Draw the icon )[sO5X7'^
dc.DrawIcon(x, y, m_hIcon); {H;|G0tR
} t!SQLgA
else pMp9O/u%
{ 3Z:!o$
CDialog::OnPaint(); htYrv5q=M
} -Y=c g;
} d:pm|C|F
$pfe2(8
HCURSOR CCaptureDlg::OnQueryDragIcon() $D s]\j*
{ 8.Ef 5-m
return (HCURSOR) m_hIcon; ?gwbg*
} 6r=)V$K<
%]0U60
void CCaptureDlg::OnCancel() #}7m'F
{ HQ`nq~%&(
if(bTray) ~|{)h^]@
DeleteIcon(); Vfm #UvA
CDialog::OnCancel();
Jf<yTAm
} q>(u>z!
oHXW])[
void CCaptureDlg::OnAbout() $a*Q).^
{ c9TAV,/fF*
CAboutDlg dlg; [l%fL9
dlg.DoModal(); /B@%pq
} ~wf~bzs
_@pf1d$
void CCaptureDlg::OnBrowse() kqigFcz!Y
{ &@utAuI
CString str; X,EYa>RSy_
BROWSEINFO bi; a/<pf\O
char name[MAX_PATH]; csX*XiDWm
ZeroMemory(&bi,sizeof(BROWSEINFO)); gQd=0"MV
bi.hwndOwner=GetSafeHwnd(); d<GG(
bi.pszDisplayName=name; q\t>D
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bi.lpszTitle="Select folder"; *DCNu{6
bi.ulFlags=BIF_RETURNONLYFSDIRS; FR,#s^kF
LPITEMIDLIST idl=SHBrowseForFolder(&bi); sx<+ *Trl
if(idl==NULL) zg Y*|{4Sl
return; 0rJ\e
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); \v3>Eo[
str.ReleaseBuffer(); Qv0>Pf
m_Path=str; - )a_ub
if(str.GetAt(str.GetLength()-1)!='\\') 8pL>wL
&C
m_Path+="\\"; pL}j
ZTo
UpdateData(FALSE); FHNuMdFn
} R c:cVK
o*wC{VP_
void CCaptureDlg::SaveBmp() ";?C4%L
{ EM54
CDC dc;
wy_;+ 'Y
dc.CreateDC("DISPLAY",NULL,NULL,NULL); b|ksMB>)
CBitmap bm; &Wv`AoV
int Width=GetSystemMetrics(SM_CXSCREEN); "o# )vA`
int Height=GetSystemMetrics(SM_CYSCREEN); ssX6kgq_(
bm.CreateCompatibleBitmap(&dc,Width,Height); @)Hbgkdi
CDC tdc; E}b>7L&w
tdc.CreateCompatibleDC(&dc); W3{<e"
CBitmap*pOld=tdc.SelectObject(&bm); iWN.3|r
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); $:u7Dv}\
tdc.SelectObject(pOld); 3@TG.)N4
BITMAP btm; ),p]n
bm.GetBitmap(&btm); f-v ND'@
DWORD size=btm.bmWidthBytes*btm.bmHeight; *fvI.cKiGP
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 3w^J"O/T
BITMAPINFOHEADER bih; ^,Y~M_=
bih.biBitCount=btm.bmBitsPixel; ^W[B[Y<k
bih.biClrImportant=0; ghobu}wuF
bih.biClrUsed=0; oY2?W
bih.biCompression=0; kL PO+lg+
bih.biHeight=btm.bmHeight; K!-&Zv
bih.biPlanes=1; %YvSHh;c
bih.biSize=sizeof(BITMAPINFOHEADER); *4hOCQ[
bih.biSizeImage=size; \p@nH%@v
bih.biWidth=btm.bmWidth; X\p`pw$
bih.biXPelsPerMeter=0; 3
!> L?
bih.biYPelsPerMeter=0; 0(U3~k6
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); $~G0#JL
static int filecount=0; h*\TCl)
CString name; ^=izqh5S
name.Format("pict%04d.bmp",filecount++); 3<)@ll
name=m_Path+name; $E`iqRB
BITMAPFILEHEADER bfh; !skb=B#
bfh.bfReserved1=bfh.bfReserved2=0; APQQ:'>N4~
bfh.bfType=((WORD)('M'<< 8)|'B'); wwK~H
bfh.bfSize=54+size; *`g-gk
bfh.bfOffBits=54; (J^Lqh_
CFile bf; <^*+8{*
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ +6#%P
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Mdlt zy=)L
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); w*6!?=jP
bf.WriteHuge(lpData,size); k{}[>))Q
bf.Close(); rtYb"-&
nCount++; ~E3SC@KL
} C:s^s
GlobalFreePtr(lpData); x<{;1F,k3
if(nCount==1) &w;^m/zP3
m_Number.Format("%d picture captured.",nCount); >G4HZE
else 5}X<(q(
m_Number.Format("%d pictures captured.",nCount); anz9lGG#
UpdateData(FALSE); VM<oUKh_3
} V
4\^TO`q=
1%/ NL?8#
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) hk"9D<&i>b
{ 2{sD*8&`
if(pMsg -> message == WM_KEYDOWN) m|nL!Wc
{ J/]o WC`u
if(pMsg -> wParam == VK_ESCAPE)
CSG+bqUG
return TRUE; G%j/eTTf
if(pMsg -> wParam == VK_RETURN) \~z?PA.$
return TRUE; \sHy. {
} VNr
return CDialog::PreTranslateMessage(pMsg); *@ <8&M9x
} MfNpQ: ]c\
75\RG+kQ
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 4+/fP
{ x ^M5D+o
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ')P2O\YS
SaveBmp(); j'#jnP*P
return FALSE; \'s$ZN$k
} xJ=ZQ)&]
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ r}_Lb.1]
CMenu pop; ;l/}Or2
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); +K$5tT6b
CMenu*pMenu=pop.GetSubMenu(0); XQ0#0<
pMenu->SetDefaultItem(ID_EXITICON); u5cVz_S
CPoint pt; To# E@Nw
GetCursorPos(&pt); Nh1e1m?
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 0okO+QU,a
if(id==ID_EXITICON) ;B|^2i1Wi
DeleteIcon(); #uD)0zdw
else if(id==ID_EXIT) (<]\,pP0_
OnCancel(); u|m[(-`
return FALSE; Xb(CH#*{z
} w&wA >q>&
LRESULT res= CDialog::WindowProc(message, wParam, lParam); {(m+M
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ibZt2@GB)I
AddIcon(); pPi YPfs
return res; R
"/xne
} 5';/@M
SZim>@R
void CCaptureDlg::AddIcon() B^8ZoF
{ GZ/pz+)i&
NOTIFYICONDATA data; y+
6`|
h_
data.cbSize=sizeof(NOTIFYICONDATA); _XH4;uGg
CString tip; eD*?q7
tip.LoadString(IDS_ICONTIP); R/ALR
data.hIcon=GetIcon(0); z9k*1:
data.hWnd=GetSafeHwnd(); b"ol\&1
#
strcpy(data.szTip,tip); msA' 5>
data.uCallbackMessage=IDM_SHELL; ShL1'Z}^{
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; X[GIOPDx
data.uID=98; VZT6;1TD$8
Shell_NotifyIcon(NIM_ADD,&data); G*P[z'K=
ShowWindow(SW_HIDE); h.4qlx|
bTray=TRUE; ysSjc
} 38V $ <w
fbh6Ls/
void CCaptureDlg::DeleteIcon() olD@W
UB
{ l?[{?Luq
NOTIFYICONDATA data; f
pv= P
data.cbSize=sizeof(NOTIFYICONDATA); JYZ2k=zh
data.hWnd=GetSafeHwnd(); T7>48eH
data.uID=98; I!|y;mh:it
Shell_NotifyIcon(NIM_DELETE,&data); :Az8K )
ShowWindow(SW_SHOW); ttK,((=@
SetForegroundWindow(); M(n<Iu4^_
ShowWindow(SW_SHOWNORMAL); b34zhZ
bTray=FALSE; 2x7(}+eD
} c&E*KfOG
bn0"M+7)f
void CCaptureDlg::OnChange() /#-,R,Q
{ o/tVcv
RegisterHotkey(); C-s>1\I
} 3+CSQb8
EpRXjz
BOOL CCaptureDlg::RegisterHotkey() /~H[= Pf
{ /[\6oa
UpdateData(); r+imn&FK8
UCHAR mask=0; g8%MOhg
UCHAR key=0; e+NWmu{<_
if(m_bControl) ?60>'Xjj
mask|=4; ,bB( 24LD
if(m_bAlt) fp.!VOy
mask|=2; tP}Xhn`
if(m_bShift) %iK%$
mask|=1; Hnfvo*6d.e
key=Key_Table[m_Key.GetCurSel()]; T6sr/<#<(
if(bRegistered){ kVV\*"9y
DeleteHotkey(GetSafeHwnd(),cKey,cMask); fC=fJZU7$
bRegistered=FALSE; <T(s\N5B=
} =}~NRmmF
cMask=mask; I["F+kt^^
cKey=key; e(?:g@]-r
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 5Z*
b(R
return bRegistered; |$YyjYK
} BhqhyX\D&y
sFbfFUd
四、小结 xL9:4'I
AyE%0KmraK
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。