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:
$hq'9}ASOL
IT=<p60" 一、实现方法
.}ePm( )H|cri~D 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:
c-q=Ct 8D6rShx = #pragma data_seg("shareddata")
G"D=ozr HHOOK hHook =NULL; //钩子句柄
WI}cXXUKm0 UINT nHookCount =0; //挂接的程序数目
caXSt2|' static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
&$8YW]1M static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
>N8*O3 static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
\zx$]|AQ static int KeyCount =0;
|cIv&\ x static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
8c^Hfjr0 #pragma data_seg()
^< wn $BUm, 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。
O#72h] A8U\/GP 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:
s>c0K@ADO 3*!w c.= BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
]@A}v\wa cKey,UCHAR cMask)
>Pf\"%* {
iM(Q-%HP_ BOOL bAdded=FALSE;
r%412# for(int index=0;index<MAX_KEY;index++){
t5;)<N` if(hCallWnd[index]==0){
gUHx(Fi[4 hCallWnd[index]=hWnd;
dBNx2T}_0 HotKey[index]=cKey;
L5 Q^cY]p HotKeyMask[index]=cMask;
jHQnD]Hr bAdded=TRUE;
j`:D BO&)\ KeyCount++;
l _g JC. break;
20?@t.aMp }
$~)YI/b }
W@FSQ8b>$m return bAdded;
0AD8X+M{P }
^\C Fke= //删除热键
gi #dSd1\& BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
SI,
t:=D {
vtF|:*h BOOL bRemoved=FALSE;
EaKbG> for(int index=0;index<MAX_KEY;index++){
i)th] 1K% if(hCallWnd[index]==hWnd){
am+w<NJ(us if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
P^[y~I#{ hCallWnd[index]=NULL;
Kn,td:( HotKey[index]=0;
14z
?X% HotKeyMask[index]=0;
9|NH5A"H. bRemoved=TRUE;
?4cj"i KeyCount--;
bZW dd6 break;
|qz&d=> }
{@ Z=b5/P }
J>8kJCh9g }
8e32NJ^k~ return bRemoved;
E{BX $R_8 }
2Og<e| ,#U[)}im W^YaC
(I DLL中的钩子函数如下:
RmRPR<vGW $0XR<D LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
wDDNB1_E {
NOFuX9/'w BOOL bProcessed=FALSE;
#7['M;_ if(HC_ACTION==nCode)
`!Yd$=*c_& {
=z[$o9 if((lParam&0xc0000000)==0xc0000000){// 有键松开
eI,H switch(wParam)
2{<o1x,Ym {
\![ p-mW{ case VK_MENU:
l1vI MaskBits&=~ALTBIT;
K.Tob,5` break;
i
?PgYk&} case VK_CONTROL:
:}z`4S@b MaskBits&=~CTRLBIT;
nrg$V>pD break;
FxmHy{JG case VK_SHIFT:
OJiwI)a9 MaskBits&=~SHIFTBIT;
lokKjs break;
9DdR"r'7 default: //judge the key and send message
nh*6`5yj break;
A DVUx} }
ZvwU for(int index=0;index<MAX_KEY;index++){
Mj`g84 if(hCallWnd[index]==NULL)
3,?LpdTS continue;
IG&twJR if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
D)tL}X$ {
"!ks7:}v SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
)H(i)$I bProcessed=TRUE;
iDWM-Ytx }
CaC \\5wl }
HD'adj_, }
cx]H8]ch7 else if((lParam&0xc000ffff)==1){ //有键按下
//'&a-%$^ switch(wParam)
+xd@un[r< {
RM;Uq>l case VK_MENU:
=0az5td MaskBits|=ALTBIT;
WK0:3q(P break;
6MNr H case VK_CONTROL:
$0k7W?tu MaskBits|=CTRLBIT;
lffw
" break;
cn: L]%< case VK_SHIFT:
60 %VG MaskBits|=SHIFTBIT;
q%LjOPE
V break;
[*M': default: //judge the key and send message
BA[ uO3\4 break;
N\|BaZ%>| }
V!l?FOSZ for(int index=0;index<MAX_KEY;index++){
jZD)c_'U if(hCallWnd[index]==NULL)
/DjsnU~3 continue;
!yd]~t
5Q if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
(D:-p:q. {
Gt)ij?~ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
w' E(9gV bProcessed=TRUE;
F^Bk @ }
v: veKA }
=R<92v }
}2Tq[rl~s if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
Fv*Et-8tN5 for(int index=0;index<MAX_KEY;index++){
e_"m\e#N if(hCallWnd[index]==NULL)
$01csj continue;
1_};!5$. if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
1tLEKSo+ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
_xmQGX!| //lParam的意义可看MSDN中WM_KEYDOWN部分
`NTtw;%Y }
+#\7
#Y }
ex
BLj
*] }
H32o7]lT return CallNextHookEx( hHook, nCode, wParam, lParam );
9c%CCZ }
Wm}gnNwA \E[6wB>uN% 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:
e{9~m r@/@b{= BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
Q :.i[ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
Kv2S&P|jXM YUHiD* 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:
SU1N*k#-o iCLH LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
TW|- 0
{
9g\;L:' if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
TyjZ {
*AP"[W //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
F{.\i *$ SaveBmp();
mz+UkA' return FALSE;
+xvn n }
;6~5FTmV …… //其它处理及默认处理
Oxa8u e? }
.cHkh^EDY %`QgG |}.}q 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。
zvVo-{6 bkc*it 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。
hNhEA $X5 {
0-on"o 二、编程步骤
Ctn
4q'Q z:$ibk4#h 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";
hO&_VCk TEh.?
2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
#4lIna%VX p_(En4QSH 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;
rlGv6)vb gO)":!_n W 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;
)$1>6C\ C JER&"em7 5、 添加代码,编译运行程序。
a+cDH lx=tOfj8 三、程序代码
]%y>l j?Y *c [^/ ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
J8i,[,KcE #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
~\8(+qIv%f #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
d,?Tq #if _MSC_VER > 1000
KPI96P #pragma once
#\`kg#& #endif // _MSC_VER > 1000
ZX64kk+ #ifndef __AFXWIN_H__
)UM^#<- #error include 'stdafx.h' before including this file for PCH
Mn/@?K?y #endif
'A^q)hpax #include "resource.h" // main symbols
i#hFpZ6u class CHookApp : public CWinApp
~!!\#IX {
dJ
m9''T') public:
fBctG~CJH CHookApp();
b,YNCb]H // Overrides
0#Lmajs // ClassWizard generated virtual function overrides
aZCq{7Xs //{{AFX_VIRTUAL(CHookApp)
R"9wVM;*c public:
XL^05 virtual BOOL InitInstance();
D%nd7
| virtual int ExitInstance();
gFKJbjT| //}}AFX_VIRTUAL
M:{Aq&. //{{AFX_MSG(CHookApp)
v&'#Gg // NOTE - the ClassWizard will add and remove member functions here.
(S?Y3l| // DO NOT EDIT what you see in these blocks of generated code !
9O:l0
l //}}AFX_MSG
x(vQ%JC DECLARE_MESSAGE_MAP()
g27'il };
9aY8`B LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
{x.0Yh7 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
nvT@'y+ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
)t"-#$,@ BOOL InitHotkey();
1kKfFpN BOOL UnInit();
g+4y^x(X@1 #endif
y/c3x*l.xL <JH,B91 //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
4|E^
#C #include "stdafx.h"
giX[2`^NG #include "hook.h"
xsn=Ji2 F #include <windowsx.h>
)?UoF&c/ #ifdef _DEBUG
CDRbYO #define new DEBUG_NEW
{\(MMTQ #undef THIS_FILE
gWGDm~+ static char THIS_FILE[] = __FILE__;
$q)YC.5$ #endif
} P ," #define MAX_KEY 100
z&tC5]# #define CTRLBIT 0x04
QJRnpN/ #define ALTBIT 0x02
sHc-xnd #define SHIFTBIT 0x01
(X,i,qK/ #pragma data_seg("shareddata")
%&yPl{ HHOOK hHook =NULL;
1QG q;6\ UINT nHookCount =0;
'2*OrY static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
!43!JfD static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
l^9gFp~I static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
z'_Fg0kR{ static int KeyCount =0;
qrYbc~jI7 static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
uW(-? #pragma data_seg()
7>__ fQu HINSTANCE hins;
HDhISPg void VerifyWindow();
hc[ K
VLpS BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
5tQz!M //{{AFX_MSG_MAP(CHookApp)
;_e9v, // NOTE - the ClassWizard will add and remove mapping macros here.
Td|u@l4B // DO NOT EDIT what you see in these blocks of generated code!
GQn:lu3j: //}}AFX_MSG_MAP
%7)TiT4V END_MESSAGE_MAP()
3X`9&0:j% $M 8&&M CHookApp::CHookApp()
>ep<W<b {
31a,i2Q4 // TODO: add construction code here,
{uaDpRt // Place all significant initialization in InitInstance
GDL/5m# }
() _RLA B/1j4/MS CHookApp theApp;
Oh*~+/u}q LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
eZa*WI= {
3-
Kgz BOOL bProcessed=FALSE;
SQ_?4 s:: if(HC_ACTION==nCode)
4SJ aAeIZ {
B#Ybdp ; if((lParam&0xc0000000)==0xc0000000){// Key up
}}=n]_f switch(wParam)
q()o|V {
iY,C0=n5Y case VK_MENU:
pT]hPuC MaskBits&=~ALTBIT;
THp_ dTD break;
Nh.+woFq4 case VK_CONTROL:
{Ya$Q#l MaskBits&=~CTRLBIT;
*#mmk1` break;
(BVqmi{ case VK_SHIFT:
0Idek MaskBits&=~SHIFTBIT;
]`&_!T break;
bE
!SW2:M default: //judge the key and send message
})/P[^ break;
Yub}AuU`v }
5qtk#FB for(int index=0;index<MAX_KEY;index++){
j%Au0k if(hCallWnd[index]==NULL)
0+FPAqX continue;
.n]"vpWm[ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
V#7,vas {
,=u;1 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
sm/aL^4 bProcessed=TRUE;
Jw;~ $ }
@*YF!LdU{M }
]<>cjk.ya }
=6[.||9 else if((lParam&0xc000ffff)==1){ //Key down
u?Ffqt9' switch(wParam)
SH?McBxS {
#Q8_:dPY case VK_MENU:
x.+T65X~4 MaskBits|=ALTBIT;
%R c#/y break;
xpR`fq case VK_CONTROL:
1&=)Bxg4 MaskBits|=CTRLBIT;
Ek)drt7cy break;
\G gh 95y case VK_SHIFT:
OTXZdAv MaskBits|=SHIFTBIT;
5~[7|Y break;
_nMd default: //judge the key and send message
9Y:I)^ek break;
3x+lf4" }
0Qt!w( for(int index=0;index<MAX_KEY;index++)
E )_n?>Ar {
bw P=f. if(hCallWnd[index]==NULL)
,>a!CnK= continue;
j&d5tgLB if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
, _e[P {
M}\h?s SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
P8z%*/
3NF bProcessed=TRUE;
MbRTOH }
8_('[89m }
u9hd%}9Qd? }
yJ $6vmQ if(!bProcessed){
_re# b? for(int index=0;index<MAX_KEY;index++){
Jl~ *@0( if(hCallWnd[index]==NULL)
( eTrqI` continue;
lx:$EJ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
+8Lbz^# SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
V"YeF:I }
r:g\ }
f$C{Z9_SX }
%~!4DXrMk return CallNextHookEx( hHook, nCode, wParam, lParam );
Ek{Q NlQ]4 }
0caZ_-zU 1rm\ u% BOOL InitHotkey()
&b} \).5E {
uHg q"e if(hHook!=NULL){
a{nR:zPE nHookCount++;
` 2W^Ui,4 return TRUE;
M =^d }
E_ns4k#uG else
S<0 &V hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
eY<<Hld if(hHook!=NULL)
o$No@~%v nHookCount++;
1h$?, return (hHook!=NULL);
;'7(gAE }
<mn[- BOOL UnInit()
Np" p*O {
xb;{<~`71 if(nHookCount>1){
l0Q5q)U1A nHookCount--;
E-z5mX.2 return TRUE;
Vu$m1,/ }
bk0>f BOOL unhooked = UnhookWindowsHookEx(hHook);
gNCS*a if(unhooked==TRUE){
2aYBcPFQh# nHookCount=0;
ot}erC2~ hHook=NULL;
mku@n;Hl_ }
v;]rFc#Px[ return unhooked;
$mQ0w~:@ }
up5f]:! A=<7*E BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
2HeX( rB {
&hYgu3O BOOL bAdded=FALSE;
hXTfmFy{n for(int index=0;index<MAX_KEY;index++){
e5'I W__ if(hCallWnd[index]==0){
IoDT hCallWnd[index]=hWnd;
r: K1PO HotKey[index]=cKey;
}+@9[Q
L HotKeyMask[index]=cMask;
Uy?jVPL bAdded=TRUE;
J2z/XHS KeyCount++;
W==~9 break;
2R/|/>T v }
n5}]C{s' }
OC=&!< return bAdded;
d(q1?{zr4 }
p@tg pFt *[si!e% BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
hYJzF.DW<$ {
u$T]A8e BOOL bRemoved=FALSE;
p<fCGU for(int index=0;index<MAX_KEY;index++){
TLwxP" if(hCallWnd[index]==hWnd){
RjWwsC~B if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
Q %o@s3~O hCallWnd[index]=NULL;
tsb[=W!Ar8 HotKey[index]=0;
2*Qv6
:qK HotKeyMask[index]=0;
`ASDUgx Mq bRemoved=TRUE;
J K/{IkF KeyCount--;
:;{M0 break;
As,`($= }
6v)TCj/ }
SQN?[v }
N5?bflY return bRemoved;
^k6_j\5j }
?ko#N?hgI H*W>v[> void VerifyWindow()
> 80{n8 {
/!5Wd(: for(int i=0;i<MAX_KEY;i++){
] ?DU8 if(hCallWnd
!=NULL){ TQ"XjbhU;X
if(!IsWindow(hCallWnd)){ &n<YmW?"
hCallWnd=NULL; 82LE9<4A
HotKey=0; noWF0+%
HotKeyMask=0; eRMN=qP.q
KeyCount--; ^j}C]cq{Xg
} J M`w6}
} 3aqH!?rVU
}
{++EX2
} F[ E'R.:
'@{:FrG*U
BOOL CHookApp::InitInstance() io#}z4"'qY
{ MPB[~#:
AFX_MANAGE_STATE(AfxGetStaticModuleState()); 7b"fpB
hins=AfxGetInstanceHandle(); |
eBwcC#^
InitHotkey(); `J.,dqGb
return CWinApp::InitInstance(); Sdq}?- &Sa
} alb3oipOB
Y%
iqSY
int CHookApp::ExitInstance() @O#!W]6NT6
{ Cut~k"lv
VerifyWindow(); VX)8pV$
UnInit(); 65LtCQ}
return CWinApp::ExitInstance(); *;A ;)'
} D \ rns+
"| '~y}v_
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file "|
nXR8t.r
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Wdd}y`lS
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ DGvuo 8
#if _MSC_VER > 1000 2
}xePX9?
#pragma once qk& F>6<9*
#endif // _MSC_VER > 1000 {hS!IOM
+<bj}"
class CCaptureDlg : public CDialog N3G9o`k
{ ASXGM0t
// Construction LHY7_"u#
public: Q>1BOH1by
BOOL bTray; Z=Y29V8
BOOL bRegistered; <nk|Z'G E
BOOL RegisterHotkey(); j97+'AKX
UCHAR cKey; zhJeTctRz
UCHAR cMask; PD&e6;rj;
void DeleteIcon(); HoQb.Z
void AddIcon(); YIe1AF}
UINT nCount; ZF7@ b/-me
void SaveBmp(); A]bb*a1
CCaptureDlg(CWnd* pParent = NULL); // standard constructor do" m=y
// Dialog Data vj?{={Y
//{{AFX_DATA(CCaptureDlg) 1<!P:@(
enum { IDD = IDD_CAPTURE_DIALOG }; !U`4
CComboBox m_Key; Jn hdZa
BOOL m_bControl; {~apY,3
BOOL m_bAlt; r5j$FwY
BOOL m_bShift; G$C2?|V)=
CString m_Path; ?b_E\8'q]
CString m_Number; _T)y5/[
//}}AFX_DATA <F3{-f'Rx
// ClassWizard generated virtual function overrides ,6+joKe-
//{{AFX_VIRTUAL(CCaptureDlg) dgVGP_~
public: DAw1S$dM
virtual BOOL PreTranslateMessage(MSG* pMsg); {6u)EJ
protected: J^8j|%h%e
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Dl>tF?=
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); J4qk^1m.
//}}AFX_VIRTUAL 5o6IpF0V
// Implementation hb3n-
rO
protected: k+_>`Gre}
HICON m_hIcon; O*N:A[eW
// Generated message map functions ? 2}%Rb39
//{{AFX_MSG(CCaptureDlg) S?v/diK ]J
virtual BOOL OnInitDialog(); )G48,.
"
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); c]pz&
afx_msg void OnPaint(); QQAEG#.5
afx_msg HCURSOR OnQueryDragIcon(); "%T~d[M
virtual void OnCancel(); W ^<AUT
afx_msg void OnAbout(); U5"u
h} 3
afx_msg void OnBrowse(); "kApGNB
afx_msg void OnChange(); 8u*<GbKGI
//}}AFX_MSG z83v
J*.
DECLARE_MESSAGE_MAP() a?gF;AYk
}; ~gX1n9_n
#endif KR.;X3S}
a
4?A 5
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file kF1$
#include "stdafx.h" SS/vw%
#include "Capture.h" I[E 6N2
#include "CaptureDlg.h" b`e_}^,c
#include <windowsx.h> Ug*B[q/
#pragma comment(lib,"hook.lib") ~&~4{
#ifdef _DEBUG c|<F8n
#define new DEBUG_NEW ~ZafTCa;
#undef THIS_FILE |5flvkid
static char THIS_FILE[] = __FILE__; Y%i<~"k
#endif 56C8)?
#define IDM_SHELL WM_USER+1 mAlG}<
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); K+Him]
b
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); yl$Ko
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 1ZFKLI`V
class CAboutDlg : public CDialog !w7/G
{ -aT-<+?s
public: inW7t2p<s
CAboutDlg(); D:k< , {
// Dialog Data K qJE?caw
//{{AFX_DATA(CAboutDlg) kw59`z Es
enum { IDD = IDD_ABOUTBOX }; ,X/j6\VBO
//}}AFX_DATA :}_hz )
// ClassWizard generated virtual function overrides ?q6#M&|j/I
//{{AFX_VIRTUAL(CAboutDlg) Pz50etJ
protected: LB@<Q.b,U
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support N+.Nu= +i2
//}}AFX_VIRTUAL cK|Uwzifd
// Implementation 7"|Qmyb
protected: ]fb@>1
jp
//{{AFX_MSG(CAboutDlg) iZTU]+z!
//}}AFX_MSG FKL4`GEm
DECLARE_MESSAGE_MAP() /US% s
}; EI=~*&t
";U~wZW_
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) aH;AGbp
{ [w}- )&c
//{{AFX_DATA_INIT(CAboutDlg) sd4eG
//}}AFX_DATA_INIT D@p{EH
} ET^?>YsA
Kjbk
zc1
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Sk
EI51]
{ Op0*tj2i),
CDialog::DoDataExchange(pDX); 2:Yvr_L
//{{AFX_DATA_MAP(CAboutDlg) Zwq\m.h
//}}AFX_DATA_MAP emQc%wd{
} 8K2 @[TE=5
M?8sy
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 3^KR{N p
//{{AFX_MSG_MAP(CAboutDlg) v[|-`e*
// No message handlers uWx<J3~q.
//}}AFX_MSG_MAP YXo?(T..
END_MESSAGE_MAP() +8<$vzB
MO0t
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ((Av3{05H&
: CDialog(CCaptureDlg::IDD, pParent) ta95]|z"j
{ 8i$|j~M a
//{{AFX_DATA_INIT(CCaptureDlg) l!gX-U%-
m_bControl = FALSE; `Fcr`[
m_bAlt = FALSE; "(jD*\8x
m_bShift = FALSE; nU=
m_Path = _T("c:\\"); Wpf~Ji6||
m_Number = _T("0 picture captured."); I3
6@x`f
nCount=0; 5ppr;QaB
bRegistered=FALSE; ,i6U*
bTray=FALSE; QcWg
//}}AFX_DATA_INIT ~_i=hx
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ms3"
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 7x.j:{2
} yVVyWte,
Dlz0*eHD
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) nYyKz
Rz
{ H6Zo|n
CDialog::DoDataExchange(pDX); O!>#q4&]
//{{AFX_DATA_MAP(CCaptureDlg) xVsI#`<a
DDX_Control(pDX, IDC_KEY, m_Key); h% >ZN-K)
DDX_Check(pDX, IDC_CONTROL, m_bControl); #Ey_.4S
DDX_Check(pDX, IDC_ALT, m_bAlt); ,fiV xn Q
DDX_Check(pDX, IDC_SHIFT, m_bShift); qJ5b;=
DDX_Text(pDX, IDC_PATH, m_Path); ?o)?N8U
DDX_Text(pDX, IDC_NUMBER, m_Number); uj)vh
//}}AFX_DATA_MAP BZv:E?1z
} u~,hTY(%
0B[~j7EGO
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) G5|nt#>
//{{AFX_MSG_MAP(CCaptureDlg) v~x`a0
ON_WM_SYSCOMMAND() c)Ng9p
ON_WM_PAINT() cGs&Kn;h
ON_WM_QUERYDRAGICON() PE;<0Cz\
ON_BN_CLICKED(ID_ABOUT, OnAbout) ){mqo%{SO
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) >'#vC]@
ON_BN_CLICKED(ID_CHANGE, OnChange) P#3J@aRC
//}}AFX_MSG_MAP kXdXyq
END_MESSAGE_MAP() ,f%4xXI
KCpq<A%
BOOL CCaptureDlg::OnInitDialog() C/
VHzV%q
{ EPwU{*F
CDialog::OnInitDialog(); )Ko~6.:5H
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); \0Xq&CG=E
ASSERT(IDM_ABOUTBOX < 0xF000); #'@@P6o5
CMenu* pSysMenu = GetSystemMenu(FALSE); 2f{p$YIt
if (pSysMenu != NULL) c0l?+:0M
{ 16N|
CString strAboutMenu; 7}NvO"u
strAboutMenu.LoadString(IDS_ABOUTBOX); S@[NKY
if (!strAboutMenu.IsEmpty()) >mtwXmI
{ Zqf
ovG
pSysMenu->AppendMenu(MF_SEPARATOR); F <iV;+
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 9s!R_R&W.
} _s<BXj
} 'A3*[e|OS
SetIcon(m_hIcon, TRUE); // Set big icon ]N\D^`iQ
SetIcon(m_hIcon, FALSE); // Set small icon K}N~KDW R|
m_Key.SetCurSel(0); G,+3(C
RegisterHotkey(); D'%M#S0
CMenu* pMenu=GetSystemMenu(FALSE); -`\n/"#X6i
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); CXuMNa
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 9]T61Z{OW1
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); :3s^, g
return TRUE; // return TRUE unless you set the focus to a control zXUB6.
e
} >`[+24e
&*8.%qe;
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) $mf O:%
{ g0QYBrp
if ((nID & 0xFFF0) == IDM_ABOUTBOX) CX2qtI8N?
{ FQ0 ;%Z
CAboutDlg dlgAbout; d~6UJ=]@8
dlgAbout.DoModal(); N/#x
} (QojIdHt
else 9Y:.v@:}0
{ 6shN%
CDialog::OnSysCommand(nID, lParam); 6uUzky
} } gwfe
H
} JoG(Nk]
yW*,Llb5
void CCaptureDlg::OnPaint() vV=rBO0a?
{ [5!{>L`
if (IsIconic()) GBBp1i
{ ru/{s3
CPaintDC dc(this); // device context for painting
KR R)pT
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); [ns==gDD
// Center icon in client rectangle ?
47"$=G
int cxIcon = GetSystemMetrics(SM_CXICON); '
Qlj"U
int cyIcon = GetSystemMetrics(SM_CYICON); f6\4,()
CRect rect; 'ahZ*@kr
GetClientRect(&rect); mBB"e"o
int x = (rect.Width() - cxIcon + 1) / 2; ;*+H&
int y = (rect.Height() - cyIcon + 1) / 2; !M)] 1Y
// Draw the icon `WMU'ezF
dc.DrawIcon(x, y, m_hIcon); Z;tWV%F5
} ~$//4kES
else JSylQ201
{ {md5G$*%
CDialog::OnPaint(); MLiaCG;
} q-@&n6PEOZ
} p Djt\R<f
y\CxdTs
HCURSOR CCaptureDlg::OnQueryDragIcon() 9GT}_
^fb
{ Gr}NgyT<!D
return (HCURSOR) m_hIcon; B+jh|@-
} 8$ RiFD,
B>I:KGkV
void CCaptureDlg::OnCancel() _d^d1Q}V
{ +BhJske
if(bTray) S{)K_x
DeleteIcon(); |#BN!kc
CDialog::OnCancel(); ^xScVOdP
} R?#=^ $7U
|+[Y_j
void CCaptureDlg::OnAbout() Y]`o-dV
{ tnBCO%uG
CAboutDlg dlg; rf`xY4I\
dlg.DoModal(); RFSwX*!
} j,
*=D6
+~P_o_M
void CCaptureDlg::OnBrowse() ~>_UTI
{ [wJ\.9<Oa
CString str; / $s(OFbi#
BROWSEINFO bi; M^e}w!U
char name[MAX_PATH]; 5yj# 9H
ZeroMemory(&bi,sizeof(BROWSEINFO)); \"L0d1DK)
bi.hwndOwner=GetSafeHwnd(); +T4}wm
bi.pszDisplayName=name; Q`;eI
a6U
bi.lpszTitle="Select folder"; K W
ZEi?
bi.ulFlags=BIF_RETURNONLYFSDIRS; jS8B:>
LPITEMIDLIST idl=SHBrowseForFolder(&bi); k=d0%}
`M(
if(idl==NULL) V[Sj+&e&
return; a2]ZYY`R7
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); CY*GCkH
str.ReleaseBuffer(); i{:iRUC#
m_Path=str; cF EO}
if(str.GetAt(str.GetLength()-1)!='\\') YdIZikF#
m_Path+="\\"; Jk7 Am-.0
UpdateData(FALSE); MZWv#;.]
} 8^_e>q*W
mH\2XG8nV
void CCaptureDlg::SaveBmp() B~@Gfb>`'
{ .A_R6~::
CDC dc; @SaxM4
dc.CreateDC("DISPLAY",NULL,NULL,NULL); ;n|%W,b-
CBitmap bm; oIj-Y`92!
int Width=GetSystemMetrics(SM_CXSCREEN); =&Tuh}
int Height=GetSystemMetrics(SM_CYSCREEN); "(dI/}
bm.CreateCompatibleBitmap(&dc,Width,Height); 8GjETq%}
CDC tdc; u]`0QxvZ
tdc.CreateCompatibleDC(&dc); %.'oY%
CBitmap*pOld=tdc.SelectObject(&bm); `ueOb
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); je 3Qq1
tdc.SelectObject(pOld); tJ8:S@E3,
BITMAP btm; ,!PV0(F(
bm.GetBitmap(&btm); B&1E&Cv_8
DWORD size=btm.bmWidthBytes*btm.bmHeight; f#7=N{wm
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); S,avvY.U\
BITMAPINFOHEADER bih;
{gD`yoPrV
bih.biBitCount=btm.bmBitsPixel; q"S,<I<f
bih.biClrImportant=0; lF40n4}
bih.biClrUsed=0; 9`"#OQPn1
bih.biCompression=0; F~7TE91C
bih.biHeight=btm.bmHeight; 5DkEJk7a
bih.biPlanes=1; AGO"),
bih.biSize=sizeof(BITMAPINFOHEADER); V,8Z!.MG
bih.biSizeImage=size; :>_oOn[ _
bih.biWidth=btm.bmWidth; *DZ7,$LQ~D
bih.biXPelsPerMeter=0; \}Iq-Je
bih.biYPelsPerMeter=0; D,lY_6=
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 5Fj9.K~k
static int filecount=0; Dbq/t^
CString name; 2|WM?V&
name.Format("pict%04d.bmp",filecount++); fU$_5v4
name=m_Path+name; 59"tHb6 E
BITMAPFILEHEADER bfh; >LH}A6dUC
bfh.bfReserved1=bfh.bfReserved2=0; &RI;!qn6(
bfh.bfType=((WORD)('M'<< 8)|'B'); R9"}-A
bfh.bfSize=54+size; ]$sb<o
.a
bfh.bfOffBits=54; rKT.~ZP\
CFile bf; J6>tGKa+e
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ _% \%
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 6-g>(g
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ]|=`-)AP3
bf.WriteHuge(lpData,size); /EegP@[
bf.Close(); _Y}cK|3
nCount++; 7&%HE\
} ab.B?bx
GlobalFreePtr(lpData); \j BA4?(S
if(nCount==1) 0@y`iZ]
1S
m_Number.Format("%d picture captured.",nCount); Q00v(6V46
else QP%Hwt]+
m_Number.Format("%d pictures captured.",nCount); oe3=QE
UpdateData(FALSE); 8|L@-F
} pjoyMHWK
loE;q}^
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) DO+~
{ ]:']
if(pMsg -> message == WM_KEYDOWN) D@ !r?E`
{ _IV!9 JL
if(pMsg -> wParam == VK_ESCAPE) DnG9bVm>
return TRUE; z}Us+>z+jc
if(pMsg -> wParam == VK_RETURN) #T{)y
return TRUE; F+ RE
} b353+7"|
return CDialog::PreTranslateMessage(pMsg); '=\>n(%Q
} utl-#Wwt/
#sg
dMrVQ
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) "68X+!
{ )l!`k
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ >Bdh`Ot-!
SaveBmp(); HD2C^V2@M
return FALSE; 2Qh)/=8lM
} -Lb7=98
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ i:jB
CMenu pop; Dsc0;7~6
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); wi+L4v
CMenu*pMenu=pop.GetSubMenu(0); Yo=$@~vN]
pMenu->SetDefaultItem(ID_EXITICON); o~L(;A]yN
CPoint pt; ("}C& 6)cB
GetCursorPos(&pt); ?E}gm>
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ?$uF(>LD
if(id==ID_EXITICON) _Ex<VF u
DeleteIcon(); #a2Z.a<V
else if(id==ID_EXIT) 3hje
OnCancel(); ?,+&NX3m
return FALSE; 'jO8C2Th%
} ka ;=%*7T
LRESULT res= CDialog::WindowProc(message, wParam, lParam); JRZp'Ln
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) D]rYg'
AddIcon(); bAN>\zG+
return res; AkdO:hVtG
} k'PvQl"I
a^E>LJL
void CCaptureDlg::AddIcon() Sl'$w4s
{ ~-uf%=
NOTIFYICONDATA data; nHQ*#&$
data.cbSize=sizeof(NOTIFYICONDATA); .XRe:\8mc
CString tip; i_l{#*t
tip.LoadString(IDS_ICONTIP); Gm9
data.hIcon=GetIcon(0); (NDC9Lls
data.hWnd=GetSafeHwnd(); J4U_utp
strcpy(data.szTip,tip); G51-CLM,
data.uCallbackMessage=IDM_SHELL; Tp.]{*
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; .3V L
data.uID=98; e>.^RtDF
Shell_NotifyIcon(NIM_ADD,&data); |cp_V
ShowWindow(SW_HIDE); a#[gNT~[
bTray=TRUE; LpSF*xm
} }|N88PN
"!7Hu7
void CCaptureDlg::DeleteIcon() L+T7Ge
q
{ "L1LL
iS
NOTIFYICONDATA data; ?TIi0;h
data.cbSize=sizeof(NOTIFYICONDATA); 72J=_d>+
data.hWnd=GetSafeHwnd(); K :+q9;g
data.uID=98; Bt5 P][<
Shell_NotifyIcon(NIM_DELETE,&data); WPlf8* -fQ
ShowWindow(SW_SHOW); /vi Ic
%=
SetForegroundWindow(); pR=R{=}wV
ShowWindow(SW_SHOWNORMAL); A{k1MA<F6
bTray=FALSE; \*qradgx$
} NjA[(8\:
UJ%.KU%Q}
void CCaptureDlg::OnChange() -"a(<JC^NI
{ +ZiYl[_|
RegisterHotkey();
"^ BA5
} m_Z(osoE#W
h&v].l
BOOL CCaptureDlg::RegisterHotkey() 2_o\Wor#
{ {D|ST2:E
UpdateData(); X&5N89
UCHAR mask=0; Q=vo5)t
UCHAR key=0; br
3-.g
if(m_bControl) &DHIYj1 i
mask|=4; P2iuB|B@
if(m_bAlt) P$N5j~*
mask|=2; @qjN>PH~
if(m_bShift) c;-NRvVb
mask|=1; *B{]
key=Key_Table[m_Key.GetCurSel()]; 0T#z"l<L
if(bRegistered){ ,_w}\'?L
DeleteHotkey(GetSafeHwnd(),cKey,cMask); ? u".*!%
bRegistered=FALSE; f8qDmk5s
} D+! S\~u
cMask=mask; |8[!`T*s
cKey=key; ) R5j?6}xF
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); .0gfP4{1{
return bRegistered; *=v%($~PK6
} w^ofH-R/
Z)=S>06X Q
四、小结 ePI N<F;I
ydY 7 :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。