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:
WPtMds4
8}bZ[ 一、实现方法
-H`\?
R ]\7lbLv 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:
9MT? .q JfbKf~g #pragma data_seg("shareddata")
L1rwIOgq^ HHOOK hHook =NULL; //钩子句柄
&&&9 UINT nHookCount =0; //挂接的程序数目
z*RSMfRW static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
>jv\Qh static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
$.wA?`1aSk static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
o/WC@!wg K static int KeyCount =0;
>'N!dM.+9 static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
Z{} n8b* #pragma data_seg()
R0vww_fz V>B'+b+< 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。
k5wi' !5&%\NSv 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:
s1{[{L3 eI0F!Yon BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
MO-!TZ+6 cKey,UCHAR cMask)
3I]Fdp)' {
'[Xl>Z[ BOOL bAdded=FALSE;
#K|0laul for(int index=0;index<MAX_KEY;index++){
\04mLIJr9 if(hCallWnd[index]==0){
Gbn4*<N hCallWnd[index]=hWnd;
3524m#4&@ HotKey[index]=cKey;
oKRFd_r + HotKeyMask[index]=cMask;
alc] bAdded=TRUE;
+ZclGchw KeyCount++;
"?P[9x} break;
b_|u< }
F;pQ \Y }
[]"=]f{1}; return bAdded;
!9DX=? }
~\[?wN //删除热键
l0Y?v 4 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
VRtO; F {
Z^*NnL.' BOOL bRemoved=FALSE;
)yrAov\z* for(int index=0;index<MAX_KEY;index++){
q4k.f_{ if(hCallWnd[index]==hWnd){
{c@G$ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
gM#jA8gz hCallWnd[index]=NULL;
\-c#jo.$8 HotKey[index]=0;
5KJ%]B(H2 HotKeyMask[index]=0;
e=7W7^"_ bRemoved=TRUE;
VRF6g|0; KeyCount--;
t7bqk!6hM\ break;
` 5#hjLe }
~p\n&{P0 }
{OCJ(^8i }
qU -!7=}7 return bRemoved;
nVXg,Jl }
=T4u":#N; tFiR!f) 1[s0Lz DLL中的钩子函数如下:
iX%n0i +xZQJeKb
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
IC/Q {
\_9rr6^" BOOL bProcessed=FALSE;
L,$3Yj if(HC_ACTION==nCode)
=m9 i)Q {
#uKWuGz] if((lParam&0xc0000000)==0xc0000000){// 有键松开
H2U:@.o2& switch(wParam)
M&f#wQ {
RLHYw@-j@ case VK_MENU:
=!CU $g MaskBits&=~ALTBIT;
W$'0Dc break;
'_0 case VK_CONTROL:
krjN7& MaskBits&=~CTRLBIT;
@1g&Z}L
o break;
4H-j
.|e case VK_SHIFT:
kYlg4 .~M MaskBits&=~SHIFTBIT;
@1bH}QS break;
CW-A e default: //judge the key and send message
'E -FO_N break;
^C7C$TZS }
2m" _z for(int index=0;index<MAX_KEY;index++){
\ha-"Aqze3 if(hCallWnd[index]==NULL)
+/y]h0aa continue;
A=X-;N# if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
\[ M_\&GC {
$;`I,k$0>~ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
[;^,CD|P bProcessed=TRUE;
=|,A%ZGF$ }
:u/mTZDi }
41yOXy ;~l }
3D_"yZ
else if((lParam&0xc000ffff)==1){ //有键按下
o @KW/RN" switch(wParam)
6t7fa< {
iSiDSeW8 case VK_MENU:
%w5[*V MaskBits|=ALTBIT;
J +q|$K6 break;
8TPN#" case VK_CONTROL:
zCV7%,H~ MaskBits|=CTRLBIT;
Qxt@V break;
g5Td("&n case VK_SHIFT:
TzKK;(GX MaskBits|=SHIFTBIT;
WYszk ,E break;
Q7GY3X*kA default: //judge the key and send message
%4,?kh``D break;
m|F:b}0Hb }
wz=z?AZW for(int index=0;index<MAX_KEY;index++){
HnU Et/ if(hCallWnd[index]==NULL)
6(KmA-!b(O continue;
URw5U1 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
$iPP|Rw {
!h: Q SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
CVQB"L bProcessed=TRUE;
_kN*e:t }
;GOz>pg }
NY!jwb@% }
0+ `Pg if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
hO( RZ'{ for(int index=0;index<MAX_KEY;index++){
H~o <AmE0! if(hCallWnd[index]==NULL)
g_z/{1$ continue;
t&}6;z 3 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
jO8k6<l SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
.=<$S#x^Hb //lParam的意义可看MSDN中WM_KEYDOWN部分
E FY@Y[ }
T)SbHp Y }
H?Jm'\~ }
Oy_c return CallNextHookEx( hHook, nCode, wParam, lParam );
f*fE}; }
&HDP!SLS LchnBtjn 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
&tE.6^F
>|*yh~ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
Y7SacRO BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
CdZ BG 98=la,^$ 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:
?WFh',`: d,9`<1{9 LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
8l>CR#%@C {
&y\sL"YL! if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
s'u(B]E {
E\ th%q,mG //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
s 3r=mp{ SaveBmp();
^Z}Ob= .G return FALSE;
VKW|kU7Cs$ }
}}T,W.#%u …… //其它处理及默认处理
T):SGW }
1RqgMMJL n]N 96oD (OmH~lSO. 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。
k
\qiF|B)Z e@n!x}t8 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。
fly,-$K>LO 2R.2D'4)` 二、编程步骤
Vrp[r *V@E 'C>U=cE7 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
]RIVc3?;$ I%lE;'x 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
-]S.<8<$ G>z,#Xt 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;
Qe$k3! %b}gDWs 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
Q8qz*v]{ uk7'K 0j 5、 添加代码,编译运行程序。
lMifpK h(' )" 三、程序代码
t"AzI8O lE5v-z? &| ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
ycr"Y| #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
XL5Es:"+?S #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
0 f/.>1M= #if _MSC_VER > 1000
H0*,8i5I #pragma once
@pza>^wk #endif // _MSC_VER > 1000
RBGX_v? #ifndef __AFXWIN_H__
Of[;Qn #error include 'stdafx.h' before including this file for PCH
tE"Si<[]H$ #endif
.$rC0<G[K #include "resource.h" // main symbols
]v 29 Rx class CHookApp : public CWinApp
5#2F1NX {
csQfic public:
[QczlwmO CHookApp();
K%j&/T j1 // Overrides
NAr1[{^E, // ClassWizard generated virtual function overrides
uCP>y6I //{{AFX_VIRTUAL(CHookApp)
rrBAQY|. public:
Mz=!w]qDH virtual BOOL InitInstance();
HOi C virtual int ExitInstance();
\\4Eh2
Y //}}AFX_VIRTUAL
A74920X`W //{{AFX_MSG(CHookApp)
@aG&n(.!u* // NOTE - the ClassWizard will add and remove member functions here.
-yx/7B5@ // DO NOT EDIT what you see in these blocks of generated code !
nU
z7|y //}}AFX_MSG
g:#dl\k DECLARE_MESSAGE_MAP()
!<\Br };
my.`k' LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
W WG /k17 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
'mM jjG9 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
}_OM$nzj BOOL InitHotkey();
\wav?;z BOOL UnInit();
1|QvN1? #endif
x"4%(xBu \fLvw //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
r/:%}(7; #include "stdafx.h"
+cB&Mi5 #include "hook.h"
>cR)?P/o #include <windowsx.h>
3OqX/z, #ifdef _DEBUG
j 6)Y #define new DEBUG_NEW
`,>wC+} #undef THIS_FILE
2#5,MP~r static char THIS_FILE[] = __FILE__;
2k
-+^}r #endif
C !x/
^gw #define MAX_KEY 100
>'=MH2; #define CTRLBIT 0x04
%{5n1w #define ALTBIT 0x02
9'~-U #define SHIFTBIT 0x01
FG-L0X #pragma data_seg("shareddata")
P=8>c'Q HHOOK hHook =NULL;
F?4(5 K UINT nHookCount =0;
-uR72f static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
jUMf6^^ static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
xFFr static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
mZvG|P$} static int KeyCount =0;
TH1B#Y#<J static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
{rH9grb #pragma data_seg()
GG6%bF HINSTANCE hins;
*OTS'W~t void VerifyWindow();
S"2qJ!.u BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
Q9?t[ir //{{AFX_MSG_MAP(CHookApp)
m7|RD]q& // NOTE - the ClassWizard will add and remove mapping macros here.
xi'>m IT // DO NOT EDIT what you see in these blocks of generated code!
^4$'KIq //}}AFX_MSG_MAP
cPF<D$B END_MESSAGE_MAP()
W?RE'QV8 pa]" iZz CHookApp::CHookApp()
g"8 .}1)~r {
0~gO'*2P // TODO: add construction code here,
NucM+r1P // Place all significant initialization in InitInstance
+|RB0}hFS- }
~Gv#iRi> \NL+}cL/ CHookApp theApp;
:14i?4Fd LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
L2z2}U=< {
+5p{5 q(o BOOL bProcessed=FALSE;
h3G.EM:eG if(HC_ACTION==nCode)
*,WP,-0 {
gUax'^w;V; if((lParam&0xc0000000)==0xc0000000){// Key up
)ZR+lX} switch(wParam)
%@J1]E; {
r0dDHj~F case VK_MENU:
lX!`zy{3k MaskBits&=~ALTBIT;
6j9)/ HP break;
U9d:@9Y case VK_CONTROL:
}ZOFYu0f MaskBits&=~CTRLBIT;
2 h|e break;
H=MCjh&$q case VK_SHIFT:
H#d:kil Ny MaskBits&=~SHIFTBIT;
i8pU|VpA break;
}=}>9DSM default: //judge the key and send message
b\55,La break;
%Kb9tHg
}
L\aBc} for(int index=0;index<MAX_KEY;index++){
\x\
5D^Vc if(hCallWnd[index]==NULL)
MBr:?PE7 continue;
d+L#t if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
(jWss V1 {
Cpl;vQ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
]`=X'fED bProcessed=TRUE;
?/#}ZZK^ }
quu*xJ;Ci }
yubSj* }
=!MY4&YX else if((lParam&0xc000ffff)==1){ //Key down
A2H4k|8 switch(wParam)
f|7u_f {
T=Z.U$ case VK_MENU:
JC;^--0(z MaskBits|=ALTBIT;
u' Qd, break;
Xh+ia#K case VK_CONTROL:
hZ\+FOx; MaskBits|=CTRLBIT;
8nNsrat break;
QL7>;t; case VK_SHIFT:
Hgc=M MaskBits|=SHIFTBIT;
W 0[N0c break;
Uu p(6`7 default: //judge the key and send message
F
phDF break;
}E^S]hdvz }
X=X\F@V:u for(int index=0;index<MAX_KEY;index++)
B0UJq./` {
ZXb0Y2AVx if(hCallWnd[index]==NULL)
76fIC continue;
L#h:*U{@40 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
vR7HF*8 {
B/uniR^x SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
wFn[9_`* bProcessed=TRUE;
l95<QI }
><?BqRm+ }
`m~syKz4A }
K`:=]Z8 if(!bProcessed){
f6=w3RS for(int index=0;index<MAX_KEY;index++){
Q}AE.Ef@< if(hCallWnd[index]==NULL)
x2VBm$> continue;
WgGm#I>K
if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
V~{
_3YY SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
,K9f_bv }
e&It }
rJfqA@ }
- 0HkT Y return CallNextHookEx( hHook, nCode, wParam, lParam );
uV6g[J }
yl]FP@N( I0= NaZ7 BOOL InitHotkey()
"i)Yvh[y {
ffDc6*.Q if(hHook!=NULL){
mXWTm%'[ nHookCount++;
< a rZbM return TRUE;
&x:JD1T} }
,\PVC@xJ else
+*nGp5=^GE hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
@!tVr3;N$ if(hHook!=NULL)
USML~]G
z nHookCount++;
v[k5.\No return (hHook!=NULL);
ph:3|d }
Mio>{%/ BOOL UnInit()
[pOg' {
h+7># *DH if(nHookCount>1){
/L=(^k=a.; nHookCount--;
3HV%4nZLf return TRUE;
F
8yF }
%oykcf,# BOOL unhooked = UnhookWindowsHookEx(hHook);
p
QE)p
if(unhooked==TRUE){
P @%.`8 nHookCount=0;
NY hHook=NULL;
MLVB^<qkeH }
j#A%q"]8 return unhooked;
mPZGA\ }
3C>qh{z" 6)RbPPeE BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
>O9sk {
EYS>0Y BOOL bAdded=FALSE;
=Ov7C[( for(int index=0;index<MAX_KEY;index++){
Do-^S:. if(hCallWnd[index]==0){
H3/caN: hCallWnd[index]=hWnd;
1cN')" HotKey[index]=cKey;
VAQ)Hc] HotKeyMask[index]=cMask;
[.yJV` bAdded=TRUE;
3SG?W_
KeyCount++;
*U7%|wd break;
$+=
<(* }
T8J4C=?/ }
haSM=;uPM return bAdded;
Z)<
wv&K }
!R{R?? n[+'OU[ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
$ACx*e% {
"l~Ci7& !a BOOL bRemoved=FALSE;
T`YwJ6N for(int index=0;index<MAX_KEY;index++){
]TpU"JD if(hCallWnd[index]==hWnd){
HZJL/=; if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
=C7
khE hCallWnd[index]=NULL;
pgc3jP! HotKey[index]=0;
&K%aw HotKeyMask[index]=0;
qc-,+sn( bRemoved=TRUE;
5fjd{Y[k KeyCount--;
!|{IVm/J break;
z5cYyx
r> }
eBr4O i }
c=p=-j=.J }
T.&7sbE_ return bRemoved;
XJ\hd,R }
3fS}:!sQ mX# "+X| void VerifyWindow()
6Z:YT&,f {
C0)Z6 for(int i=0;i<MAX_KEY;i++){
{ShgJ;! Q if(hCallWnd
!=NULL){ mB 55PYA
if(!IsWindow(hCallWnd)){ 3Kq`<B~%
hCallWnd=NULL; \ {|ImCH
HotKey=0; x-m/SI]_N
HotKeyMask=0; _2Py\+$
KeyCount--; `^F: -
} _2Zp1h,
} |H)cuZ
} _GaJXWMbk
} '&yg{n
Q\_{d0
0
BOOL CHookApp::InitInstance() [[L-jq.'
{ :R6Q=g=
AFX_MANAGE_STATE(AfxGetStaticModuleState()); fv'4f$U
hins=AfxGetInstanceHandle(); 85Y|CN] vQ
InitHotkey(); X)Gp7k1w
return CWinApp::InitInstance(); v|t{1[C
} ?m%h`<wgMc
%e%7oqR?
int CHookApp::ExitInstance() *>
3Qd7
{ o+?@5zw-&
VerifyWindow(); htJuGfDx1
UnInit(); UsW5d]i}Y
return CWinApp::ExitInstance(); t 0O4GcAN
} f?UzD#50D
`iixq9xi
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 02b6s&L
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) a+z2Zd!u\x
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ tai Vk4
#if _MSC_VER > 1000 E,"&-`/2v
#pragma once JSVeU54T^<
#endif // _MSC_VER > 1000 ^$?qT60%d|
APBK9ky
class CCaptureDlg : public CDialog Lk,+Tfk"
{ MgJ5B(c
// Construction ]#eh&jw
public: [/9(NUf
BOOL bTray; W4(?HTWZ
BOOL bRegistered; )m#']c:rg
BOOL RegisterHotkey(); fj']?a!m
UCHAR cKey; ?T'][q
UCHAR cMask; 2W$lQ;iO
void DeleteIcon(); QApyP CH
void AddIcon(); LsTffIP
UINT nCount; EQ
>t[ &
void SaveBmp(); '1+.t$"/tU
CCaptureDlg(CWnd* pParent = NULL); // standard constructor Z5)eREi=
// Dialog Data R 1zC.m
//{{AFX_DATA(CCaptureDlg) 7>.OVh<
enum { IDD = IDD_CAPTURE_DIALOG }; F'W>
8
CComboBox m_Key; Hcv u7uD
BOOL m_bControl; 4br6$
BOOL m_bAlt; U6j/BJT"
BOOL m_bShift; [#b2%G1
CString m_Path; v <h;Di@
CString m_Number; W'/>et
//}}AFX_DATA L]bVN)JU
// ClassWizard generated virtual function overrides <0j{ $.
//{{AFX_VIRTUAL(CCaptureDlg) Ol+Kp!ocY
public: pM$ @m]
virtual BOOL PreTranslateMessage(MSG* pMsg); A" !n1P
protected: x mo&![P
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ZwJciT!_~
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); *g7DPN$aQ
//}}AFX_VIRTUAL gY5l.&
// Implementation o0Gx%99'
protected: ;sQbn|=e"
HICON m_hIcon; @EZ>f5IO+
// Generated message map functions ([pSVOnIz
//{{AFX_MSG(CCaptureDlg) oXal
virtual BOOL OnInitDialog(); rxE&fjW
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 0D3OE.$0
afx_msg void OnPaint(); JZx%J)
afx_msg HCURSOR OnQueryDragIcon(); [X"k>
Sq
virtual void OnCancel(); VTw/_Hf2p
afx_msg void OnAbout(); W<'<'z5
afx_msg void OnBrowse(); $$gtZ{ukQ
afx_msg void OnChange(); 0s%6n5>
//}}AFX_MSG hPO>,j^
DECLARE_MESSAGE_MAP() P;U@y"s
}; >4)g4~'n!
#endif X>3^a'2,E
&HF]\`RNr
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file _}=E^/;(
#include "stdafx.h" i^g~~h
F
#include "Capture.h" UKs$W`
#include "CaptureDlg.h" g [L
#include <windowsx.h> PrnrXl
S
#pragma comment(lib,"hook.lib") n`<S&KP|
#ifdef _DEBUG eV;me>,
#define new DEBUG_NEW xZ ;bMxZ
#undef THIS_FILE 3M*Y= ?pI
static char THIS_FILE[] = __FILE__; [j0w\{
#endif "$@,n7k
#define IDM_SHELL WM_USER+1 \y~)jq:d"
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 'p)QyL`d
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); {nRUH*(d9
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; $
I<|-]u
class CAboutDlg : public CDialog uPU#c\
{ d]7*mzw^j
public: K-@bwB7~s
CAboutDlg(); M,..Kw/ }~
// Dialog Data l%PnB
)F
//{{AFX_DATA(CAboutDlg) jgRCs.6
enum { IDD = IDD_ABOUTBOX }; o;;,iHu*
//}}AFX_DATA (,tHL
// ClassWizard generated virtual function overrides chLeq
//{{AFX_VIRTUAL(CAboutDlg) ~CFMIQ et
protected: Bz:0L1@,4a
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support (j N]OE^
//}}AFX_VIRTUAL Wem?{kx0
// Implementation 3+ asP&n
protected: iS-K
~qa
//{{AFX_MSG(CAboutDlg) /0\QL+^!
//}}AFX_MSG HD00J]y_
DECLARE_MESSAGE_MAP() _LLshV3
}; 4x]NUt
Czh8zB+r
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Mjw[:70
{ {PmzkT}LF
//{{AFX_DATA_INIT(CAboutDlg) .0
X$rX=
//}}AFX_DATA_INIT lC{L6&T
} V.j#E1 P
FO^24p
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ?*o;o?5s^
{ qw0~*0}
CDialog::DoDataExchange(pDX); fLM.kCD?u
//{{AFX_DATA_MAP(CAboutDlg) +$~8)95<B
//}}AFX_DATA_MAP |_I[1%&`N
} |Gc&1*$
9:\A7 =
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) DpNX66O
//{{AFX_MSG_MAP(CAboutDlg) O3xz|&xY&
// No message handlers m)k-uWc$C
//}}AFX_MSG_MAP sL
mW\\kA>
END_MESSAGE_MAP() bL
MkPty
L8Dm9}
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) T#N80BH[
: CDialog(CCaptureDlg::IDD, pParent) Nuq(4Yf1W
{ ASq`)Rz
//{{AFX_DATA_INIT(CCaptureDlg) /&6Q)
m_bControl = FALSE; !PI0oh
m_bAlt = FALSE; !qS05
m_bShift = FALSE; Cz[5Ug'V
m_Path = _T("c:\\"); ~Jxlj(" 0(
m_Number = _T("0 picture captured."); B3.X}ys#
nCount=0; o@',YF>OQ
bRegistered=FALSE; s
kY0 \V
bTray=FALSE; Xv&%2-V;
//}}AFX_DATA_INIT w 3d\0ub
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 j]Ua\|t
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ]!-R<[b
6
} Q'C4pn@
Xky@[Td*
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) wOM<XhZ
{ C=s((q*
CDialog::DoDataExchange(pDX); $~ VcQ
//{{AFX_DATA_MAP(CCaptureDlg) 8E=vR 8
DDX_Control(pDX, IDC_KEY, m_Key); ULck
DDX_Check(pDX, IDC_CONTROL, m_bControl); oE 5;|x3
DDX_Check(pDX, IDC_ALT, m_bAlt); }Fz!6F2w
DDX_Check(pDX, IDC_SHIFT, m_bShift); CQjV!d0j
DDX_Text(pDX, IDC_PATH, m_Path); 30BR0C
DDX_Text(pDX, IDC_NUMBER, m_Number); <L%HG
//}}AFX_DATA_MAP lXw;|dGF
} _-(z@
/O_0=MLp
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) +> ^[W~[2
//{{AFX_MSG_MAP(CCaptureDlg) )2toL5 Q
ON_WM_SYSCOMMAND() *.,8,e8Vq
ON_WM_PAINT() flPZlL
ON_WM_QUERYDRAGICON() DbQBVy
ON_BN_CLICKED(ID_ABOUT, OnAbout) CP@o,v-
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) eoC<a"bJ>
ON_BN_CLICKED(ID_CHANGE, OnChange) qb9}&'@:
//}}AFX_MSG_MAP U#iT<#!l2
END_MESSAGE_MAP() VrudR#q
E4hq}
BOOL CCaptureDlg::OnInitDialog() qjzZ}
{ nHE+p\
CDialog::OnInitDialog(); "LXXs0
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); j}"]s/= 6
ASSERT(IDM_ABOUTBOX < 0xF000); /LSq%~UF
CMenu* pSysMenu = GetSystemMenu(FALSE); vg5E/+4gp%
if (pSysMenu != NULL) :nt}7Dn'
{ PQQgDtiH
CString strAboutMenu; ?'T"?b<
strAboutMenu.LoadString(IDS_ABOUTBOX); HoMQt3C
if (!strAboutMenu.IsEmpty()) Qk|( EFQ9
{ ?3n=m%W,J*
pSysMenu->AppendMenu(MF_SEPARATOR); qPp]K?.
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 2,+@#q
} -5o?#%
} Hc>([?P%t
SetIcon(m_hIcon, TRUE); // Set big icon :^K~t!@
SetIcon(m_hIcon, FALSE); // Set small icon %odw+PhO
m_Key.SetCurSel(0); xL|?(pQ/BK
RegisterHotkey(); z=u~]:.1O
CMenu* pMenu=GetSystemMenu(FALSE); ^NcTWbs-T
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); $`ON!,oa
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); FU^Y{sbDg
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); /Ql6]8.P
return TRUE; // return TRUE unless you set the focus to a control "[Yip5
} 1o(+rR<h9
,I("x2
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) <.: 5Vx(Aw
{ }1l}- w`F
if ((nID & 0xFFF0) == IDM_ABOUTBOX) #3YdjU3w
{ w"yK\OE
CAboutDlg dlgAbout; XL=2wh
dlgAbout.DoModal(); O^y$8OKEi,
} 0qOM78rE
else 'Dnq+
{ 4
3}qaf[
CDialog::OnSysCommand(nID, lParam); $&bU2 ]
} DrW/KU,{+(
} LPsh?Ca?N
$4ka +nfU
void CCaptureDlg::OnPaint() Pxap;;\
{ R%Kl&c
if (IsIconic()) t!NrB X
{ FLw[Mg:L
CPaintDC dc(this); // device context for painting AsV8k_qZL
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); GcPB'`!M
// Center icon in client rectangle L!`*R)I45
int cxIcon = GetSystemMetrics(SM_CXICON); mI2|0RWI)l
int cyIcon = GetSystemMetrics(SM_CYICON); SB5@\^
CRect rect; rHH#@Zx
GetClientRect(&rect); rD_Ss.\^g
int x = (rect.Width() - cxIcon + 1) / 2; ~4l6unCI
int y = (rect.Height() - cyIcon + 1) / 2; "X\q%%P=?
// Draw the icon =B 1`R%t
dc.DrawIcon(x, y, m_hIcon); T@2f&Un^
} /M5=tW#e
else "#[o?_GaJ
{ h]G6~TYI5
CDialog::OnPaint(); 3 t~X:
} N;%j#(v
j
} O<gP)ZW~
FA5k45wL
HCURSOR CCaptureDlg::OnQueryDragIcon() T9aTEsA[U
{ '&rw=.cU
return (HCURSOR) m_hIcon; {9y9Kr|(P:
} NHst7$Y<
>?H_A
void CCaptureDlg::OnCancel() :0i#=ODR
{ C6Um6X9/i
if(bTray) ZS07_6.~
DeleteIcon(); Rt*-#`I
$
CDialog::OnCancel(); eW<!^Aer
} +:j4G^ V
fo/(()
void CCaptureDlg::OnAbout() qg/Y;tGSx
{ \Qe'?LRu{
CAboutDlg dlg; x'VeL|
dlg.DoModal(); 5|{ t+u
} j(wY/Hl
"Wzij&WkQ
void CCaptureDlg::OnBrowse() fSm?27_
{ F>hVrUD8
CString str; vLVSZX
BROWSEINFO bi; Ktj(&/~}
char name[MAX_PATH]; DR#3njjEC
ZeroMemory(&bi,sizeof(BROWSEINFO)); 0nF>zOmc
bi.hwndOwner=GetSafeHwnd(); )AZ`R8-A
bi.pszDisplayName=name; +9&ulr
bi.lpszTitle="Select folder"; IFHgD}kp%#
bi.ulFlags=BIF_RETURNONLYFSDIRS; YB(#]H|8S
LPITEMIDLIST idl=SHBrowseForFolder(&bi); L>|A6S#y8/
if(idl==NULL) 6PVlZ
return; 4jI*Y6Wkz
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); |qFN~ !
str.ReleaseBuffer(); 476M` gA
m_Path=str; >-o?S O(M,
if(str.GetAt(str.GetLength()-1)!='\\') _A# x&<c
m_Path+="\\"; 3@#,i<ge :
UpdateData(FALSE); *;~{_Disz
} k;9#4^4(
O;.d4pO(tC
void CCaptureDlg::SaveBmp() I+-Rs2wb
{ IrVM|8vT3
CDC dc; vwSX$OZ
dc.CreateDC("DISPLAY",NULL,NULL,NULL); Fp* &os
CBitmap bm; lS Kv*
int Width=GetSystemMetrics(SM_CXSCREEN); QQ2OZy>W
int Height=GetSystemMetrics(SM_CYSCREEN); #EwRb<'Em
bm.CreateCompatibleBitmap(&dc,Width,Height); @idp8J [td
CDC tdc; ?j
; ,q
tdc.CreateCompatibleDC(&dc); OmQuAG
^\x
CBitmap*pOld=tdc.SelectObject(&bm); oD|+X/FK
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); cc#_acR
tdc.SelectObject(pOld); YjMbd?v
BITMAP btm; jw&}N6^G
bm.GetBitmap(&btm); $ET/0v"V
DWORD size=btm.bmWidthBytes*btm.bmHeight; <{P^W;N7
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Wl^/=I4p#
BITMAPINFOHEADER bih; n,R[O_9u[
bih.biBitCount=btm.bmBitsPixel; l"V8n BR`
bih.biClrImportant=0; &vGEz*F
bih.biClrUsed=0; =h1 QN
bih.biCompression=0; WHh2fN'A5
bih.biHeight=btm.bmHeight; UBpM8 /U
bih.biPlanes=1; (,Zz&3
AV
bih.biSize=sizeof(BITMAPINFOHEADER); ;U5x'}%0]
bih.biSizeImage=size; Ib<5u
bih.biWidth=btm.bmWidth; omDi<-
bih.biXPelsPerMeter=0; `XRb:d^
bih.biYPelsPerMeter=0; KfN`ZZ<
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Yqj.z| }Nb
static int filecount=0; mYU dh L^
CString name; [~&:`I1
name.Format("pict%04d.bmp",filecount++); _*-'yu8#
name=m_Path+name; bU@>1>b6lE
BITMAPFILEHEADER bfh; 1+y6W1m^R
bfh.bfReserved1=bfh.bfReserved2=0; &Cn9
k3E\R
bfh.bfType=((WORD)('M'<< 8)|'B'); 4h0jX9
bfh.bfSize=54+size; m0q`A5!)
bfh.bfOffBits=54; )QJU]G
CFile bf; }][|]/s?42
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ hwb(W?*
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ^5iY/t~Q
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); IDVY2`sM
bf.WriteHuge(lpData,size); H;"N|pBy
bf.Close(); #h|,GvmF<b
nCount++; lQ(BEv"2G[
} Tef3
Z6
GlobalFreePtr(lpData); ^?l-YnQqm?
if(nCount==1) "=0lcbC
m_Number.Format("%d picture captured.",nCount); j,V$vK P
else lyc{Z%!3
m_Number.Format("%d pictures captured.",nCount); E6d8z=X(
UpdateData(FALSE); ^#6%*(D
} 1Tk\n
Yi! >8
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) z ]4g`K+
{ UEdl"FwM4
if(pMsg -> message == WM_KEYDOWN) I]j/ ab7>
{ 3qd-,qC
if(pMsg -> wParam == VK_ESCAPE) Jb-QP'$@
return TRUE; @=|
b$E
if(pMsg -> wParam == VK_RETURN) ;),O*Z|"v
return TRUE; W YqL
} M`,Z#)Af
return CDialog::PreTranslateMessage(pMsg); ,,-[P*@
} 28L'7
%l$&_xV-
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) (YWc%f4
{ -X[8 soz
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ s%?p%2&RA
SaveBmp(); 9Z_OLai
return FALSE; q@!H^hd}
} =;?PVAdu%#
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 38.J:?Q
CMenu pop; c#-97"_8
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); d"$oV~>P|
CMenu*pMenu=pop.GetSubMenu(0); 9tW.}5V
pMenu->SetDefaultItem(ID_EXITICON); R)d7b,_Yd
CPoint pt; l+kg4y
GetCursorPos(&pt); ="nrq&2
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); M:q;z(
if(id==ID_EXITICON) ""KN?qh9
DeleteIcon(); Xcpm?aTo
else if(id==ID_EXIT) 6}FDLBA
OnCancel(); x@RA1&c
return FALSE; CjukD%>sde
} oL/^[TXjH
LRESULT res= CDialog::WindowProc(message, wParam, lParam); XjM) /-w
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) jQBdS. }'v
AddIcon(); %' g-%2C?
return res; |~vQ0D
} GZ>% &^E
^T1-dw(
void CCaptureDlg::AddIcon() }u*@b10
{ YD>>YaH_3@
NOTIFYICONDATA data; zbKW.u]v
data.cbSize=sizeof(NOTIFYICONDATA); (6y3"cbe
CString tip; mZJzBYM)
tip.LoadString(IDS_ICONTIP); 3e<^-e)+xL
data.hIcon=GetIcon(0); QZq9$;>dW
data.hWnd=GetSafeHwnd(); bB:X<
strcpy(data.szTip,tip); = 8e8!8
data.uCallbackMessage=IDM_SHELL; T7_ SO,X
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; tcdn"]#U
data.uID=98; F!cAaL1
Shell_NotifyIcon(NIM_ADD,&data); +g7nM7,1a
ShowWindow(SW_HIDE); %Yn)t3d
bTray=TRUE; av$_hEjo|D
} |MR?8A^"
s
!vROJ
void CCaptureDlg::DeleteIcon() wLp
t2b8S
{ Tsp-]-)
NOTIFYICONDATA data; }EG(!)u
data.cbSize=sizeof(NOTIFYICONDATA); p5rRhu/|k3
data.hWnd=GetSafeHwnd(); h*LL(ow5
data.uID=98; N~KRwsDH
Shell_NotifyIcon(NIM_DELETE,&data); zjZTar1Re
ShowWindow(SW_SHOW); ( #"s!!b
SetForegroundWindow(); m8A_P:MQq
ShowWindow(SW_SHOWNORMAL); aw~EK0yU
bTray=FALSE; qxr&_r
} `ha:Gf
,5"]K'Vce
void CCaptureDlg::OnChange() ti2_kYq
{ JX<W[P>M
RegisterHotkey(); n^)9QQ
} .v&h>@'m
nY0UnlB`
BOOL CCaptureDlg::RegisterHotkey() 3^UsyZS)
{ P&^7wud-sb
UpdateData(); e[dRHl
UCHAR mask=0; aM}"DY-_
h
UCHAR key=0; vj$6
if(m_bControl) twS3J)UH
mask|=4; 6N)1/=)
if(m_bAlt) :P1c>:j[
mask|=2; 9(.9l\h
if(m_bShift) C7_T]e <
mask|=1; ?7ZlX?D[
key=Key_Table[m_Key.GetCurSel()]; Y-{BY5E.
if(bRegistered){ Czxrn2p/
DeleteHotkey(GetSafeHwnd(),cKey,cMask); cY]Y8T)
bRegistered=FALSE; <~*Ol+/
} j7+t@DqQ
cMask=mask; vp9<.*h
cKey=key; _7.y4zQJ
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 5hK\YTU
return bRegistered; LkB!:+v |B
} GK%ovK
oA%[x
四、小结 j'x{j %U
>7q,[:(gs
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。