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:
)&<BQIv9/
KZ
pqbI Z 一、实现方法
Uoh!1_oV kb]PWOz 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:
`[w:l[i A$Mmnu% #pragma data_seg("shareddata")
{xp/1?Mo* HHOOK hHook =NULL; //钩子句柄
vZmM=hW ~ UINT nHookCount =0; //挂接的程序数目
iZB?5|* static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
ogH{ static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
* f=H# static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
1j
"/}0fx static int KeyCount =0;
@S yGj# static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
mTT1,| #pragma data_seg()
gh|TlvnA m@R!o 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
)Y+n4UL3NK c%yhODq/ DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
%,E\8{I+
7/w)^&8 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
c=K
.|g, cKey,UCHAR cMask)
[84ss;.$ {
MJd!J]E6 BOOL bAdded=FALSE;
Q}2aBU.f for(int index=0;index<MAX_KEY;index++){
J1T_wA_ if(hCallWnd[index]==0){
>uN{co hs hCallWnd[index]=hWnd;
[nB[]j<R* HotKey[index]=cKey;
!v;N@C3C HotKeyMask[index]=cMask;
O{uc
h bAdded=TRUE;
@-Tt<pl'L KeyCount++;
6Lr G+p` break;
1~Zmc1] }
'kf]l=i[n }
'.r_6X$7Jt return bAdded;
<spV Up }
Pk !RgoWF //删除热键
3,=97Si= BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
F~2bCy[Z {
) gbns'Z< BOOL bRemoved=FALSE;
z^j7wMQ for(int index=0;index<MAX_KEY;index++){
_8Cw_ if(hCallWnd[index]==hWnd){
GuPxN}n
5 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
t<wjS|4 hCallWnd[index]=NULL;
(-viP HotKey[index]=0;
W+d=BnOa8 HotKeyMask[index]=0;
U1}-]^\ bRemoved=TRUE;
+Kw:z? KeyCount--;
}lt5!u~} break;
GKTt!MK }
7v3'JG1r- }
d(9ZopJrQ }
@k['c
return bRemoved;
L_3Ao'SA }
$L7Z_JD5 v1h\
6r' mQdF+b1o DLL中的钩子函数如下:
\9j +ejGf IcRA[
g LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
d$qivct {
f]%:.N~1w BOOL bProcessed=FALSE;
D1hy:KkAv] if(HC_ACTION==nCode)
x7\b-EC {
]!CMo+ if((lParam&0xc0000000)==0xc0000000){// 有键松开
vZMb/}-o switch(wParam)
;Z^\$v9? {
N~H!6N W case VK_MENU:
)E9[=4+*C$ MaskBits&=~ALTBIT;
UMtnb:ek break;
prtNfwJz1j case VK_CONTROL:
m31l[e MaskBits&=~CTRLBIT;
O|%03q( break;
|H-%F?<{ case VK_SHIFT:
a',6WugIP MaskBits&=~SHIFTBIT;
1eHU!{<fqm break;
Zp8\n: default: //judge the key and send message
y7pwYRY break;
Z~R7 G }
y5/frJ for(int index=0;index<MAX_KEY;index++){
s0r::yO if(hCallWnd[index]==NULL)
c8z6-6`i0 continue;
\LuaI if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
/LwS|c6}} {
KU$:p^0l;* SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
`C pfQP&^ bProcessed=TRUE;
XZ%3PMq }
K0;caqE^ }
g0({$2Q7R }
+4L]Z;k else if((lParam&0xc000ffff)==1){ //有键按下
#aI(fQZe switch(wParam)
m\zCHX#n {
xER-TT#S case VK_MENU:
|"]#jx*8KC MaskBits|=ALTBIT;
an q1zH break;
9w3KAca case VK_CONTROL:
g[G+s4Nv MaskBits|=CTRLBIT;
n_~u!Ky_P break;
BD.&K_AW case VK_SHIFT:
arK(dg~S MaskBits|=SHIFTBIT;
UHyGW$B break;
qa-%j + default: //judge the key and send message
&t)$5\r break;
jVlXB6[- }
&{4KymB: for(int index=0;index<MAX_KEY;index++){
>]{{5oOQ> if(hCallWnd[index]==NULL)
/]U),LbN continue;
8*zORz if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
fQm3D% {
B*Z}=$1j SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
osM[Xv bProcessed=TRUE;
&=f] a }
,FIG5-e,} }
'p_|Rw> }
af@R\"N9c if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
ZR]p7{8B for(int index=0;index<MAX_KEY;index++){
-HwqR Ys if(hCallWnd[index]==NULL)
+MR]h
[ continue;
6;C2^J @ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
/ jLb{Ky SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
]hMs:$} //lParam的意义可看MSDN中WM_KEYDOWN部分
g3|k- }
~"J7=u1o }
kxQ al }
mX2X.ww(4 return CallNextHookEx( hHook, nCode, wParam, lParam );
jXPf}{^ }
-,186ZVZ cqYMzS
t 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:
^O.` P 4Sz2
9\X BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
/9b+I/xY" BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
_|r/*(hh "]T1DG" 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:
a#D \8; sWyx_ LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
F4NMq&_ {
B/Js>R if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
7Y?59
[ {
ZAJ~Tbm[f //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
kfY. 9$(d SaveBmp();
V=gu'~ return FALSE;
(}RTHpD }
dvE~EZcS …… //其它处理及默认处理
42f\]R, }
G>edJPfQ QsX`IYk :jAsm[ 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。
:FUxe kz z? Iu;X 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。
s
.@S zq v65]$%F? 二、编程步骤
lFp : F5 XL/V>`E@ 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";
FwE<_hq// v4qpE!W27~ 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
#/"Tb^c9 C>Q|"Vf2 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;
WN $KS"b6} V~_6t{L 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
wwN kJ+ c!kz wc( 5、 添加代码,编译运行程序。
%x./>-[t 00LL&ot 三、程序代码
tUksIUYD\ ba tXj]: ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
>u\'k+= #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
\WqC^Di #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
>Qqxn*O #if _MSC_VER > 1000
!'C8sNs #pragma once
SB|Cr:wM #endif // _MSC_VER > 1000
!
o?E. #ifndef __AFXWIN_H__
ta@fNS4 #error include 'stdafx.h' before including this file for PCH
Sim$:5P #endif
8Ow#W5_3| #include "resource.h" // main symbols
[F!h&M0z class CHookApp : public CWinApp
#nQboTB@ {
} rX)A\ g6 public:
e<{waJ1 CHookApp();
aA
-j // Overrides
?e%u[ Q0 // ClassWizard generated virtual function overrides
8M0<:p/ //{{AFX_VIRTUAL(CHookApp)
29nMm>P.e public:
+W/{UddeKU virtual BOOL InitInstance();
SBaTbY0 virtual int ExitInstance();
dUBf.2ry //}}AFX_VIRTUAL
CD.
XZA[ //{{AFX_MSG(CHookApp)
wHZ(=z/q // NOTE - the ClassWizard will add and remove member functions here.
"!Nu A // DO NOT EDIT what you see in these blocks of generated code !
_&N:%;9uD //}}AFX_MSG
*Z+U}QhHD6 DECLARE_MESSAGE_MAP()
,
{}S<^?] };
|kF"p~s LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
5s%FHa BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
2J Wp5 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
R|k!w] BOOL InitHotkey();
&k`/jl;u BOOL UnInit();
rM4Ri}bS #endif
f[*g8p vl!o^_70( //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
cR&d=+R& #include "stdafx.h"
5Z(q|nn7P #include "hook.h"
>CqZ75> #include <windowsx.h>
"^ aSONz #ifdef _DEBUG
oore:`m; #define new DEBUG_NEW
"AlR%:]24~ #undef THIS_FILE
_dc,}C static char THIS_FILE[] = __FILE__;
4^*Z[6nt| #endif
l$!Z};mw0E #define MAX_KEY 100
&?I3xzvK #define CTRLBIT 0x04
@.=2*e.z|b #define ALTBIT 0x02
VrKLEN\ #define SHIFTBIT 0x01
bo??91B^7 #pragma data_seg("shareddata")
"HLh3L~ HHOOK hHook =NULL;
5>:p'zI UINT nHookCount =0;
Va4AE)[/* static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
-j^G4J static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
_QtW)\)5\ static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
o9v.]tb static int KeyCount =0;
!-7<x"avm static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
>J,IxRGi #pragma data_seg()
bv``PSb3 HINSTANCE hins;
A&d_!u> void VerifyWindow();
BA9;=orx BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
H:t2;Z' //{{AFX_MSG_MAP(CHookApp)
}5d|y* // NOTE - the ClassWizard will add and remove mapping macros here.
:2lM7|@/ // DO NOT EDIT what you see in these blocks of generated code!
EkOn Rm_hn //}}AFX_MSG_MAP
U9Lo0K END_MESSAGE_MAP()
m;<5QK8f G[ q<P CHookApp::CHookApp()
0
d2to5 ( {
m.U&O=]5 // TODO: add construction code here,
V^\b"1X7N // Place all significant initialization in InitInstance
?aZ\Dg{ }
/b{Ufo3v i;67<f}- CHookApp theApp;
Ct0%3]<J LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
G)=+Nt\* {
^56#{~%^? BOOL bProcessed=FALSE;
?o d*"M if(HC_ACTION==nCode)
,f
.#- {
kCKCJ}N if((lParam&0xc0000000)==0xc0000000){// Key up
i,/Q.XL switch(wParam)
8yGo\\=T {
aVn+@g<. case VK_MENU:
O.?q8T)n82 MaskBits&=~ALTBIT;
(k %0|%eR break;
L
~$&+g case VK_CONTROL:
H"rIOoxf MaskBits&=~CTRLBIT;
Bs-MoT! break;
^p~ 3H case VK_SHIFT:
(!<G` ;}u MaskBits&=~SHIFTBIT;
}& 01=nY break;
n(\VP!u5r default: //judge the key and send message
)<L?3Jjt5 break;
0urM@/j+ }
P'k`H for(int index=0;index<MAX_KEY;index++){
+B
OuU# if(hCallWnd[index]==NULL)
.:;#[Z{- continue;
Z15b'^)?9 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
4hV~
ir {
ulXe;2 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
lJ<(
mVt bProcessed=TRUE;
N4,!b_1 }
WtbOm }
YifTC-Q; }
cs)z! else if((lParam&0xc000ffff)==1){ //Key down
p B79#4 switch(wParam)
I\VC2U
{
T( bFn? case VK_MENU:
y/ah<Y0( MaskBits|=ALTBIT;
RTYhgq break;
E2|c;{c case VK_CONTROL:
W.<I:q`eO MaskBits|=CTRLBIT;
J]Qbg7| break;
5?MKx!% case VK_SHIFT:
!%YV0O0 MaskBits|=SHIFTBIT;
S]DYEL$ break;
"cX*GTNi8 default: //judge the key and send message
V,
e break;
5,?Au }
j=w`%nh4"f for(int index=0;index<MAX_KEY;index++)
s KOy6v
{
QLyBP!X- if(hCallWnd[index]==NULL)
PciiDh~/ continue;
ON$-g_s>) if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
tJ9`Ys {
O0>^?dsL SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
2<+9lk bProcessed=TRUE;
RkBbu4uQ- }
rKW kT" }
p"/B3 }
5I@2U vV8 if(!bProcessed){
}5Pzen for(int index=0;index<MAX_KEY;index++){
o*|j}hnbv if(hCallWnd[index]==NULL)
}Gm/9@oKc continue;
r1X\$& if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
}Z\PE0 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
0Bhf(5 }
(:T\< }
W RVm^ }
{AqPQeNgz return CallNextHookEx( hHook, nCode, wParam, lParam );
"4qv
yVOE }
V$<5` FG5t\!dt< BOOL InitHotkey()
)3~):+ {
k-\RdX)E if(hHook!=NULL){
}KwL_\>&f nHookCount++;
'x!5fAy return TRUE;
421ol }
[0mg\n? else
Mi_/
^ hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
V$fvf#T if(hHook!=NULL)
m|+g_JZ nHookCount++;
F]~>qt<ia return (hHook!=NULL);
Wi(Ac8uh }
uvf}7 BOOL UnInit()
{QTnVS't 0 {
4&([<gyR< if(nHookCount>1){
!5K9L(gqb nHookCount--;
@s;qmBX4 return TRUE;
4q\bnt }
l>O~^41[ BOOL unhooked = UnhookWindowsHookEx(hHook);
Do5)ilt if(unhooked==TRUE){
*R6Ed nHookCount=0;
K0O&-v0"1 hHook=NULL;
rSvQarT }
&?#G)suP return unhooked;
$Y5m"wySZ }
d%: /^<Uy3F[p BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
O
o+pi$W {
UMbM3m=\ BOOL bAdded=FALSE;
L) ]|\| for(int index=0;index<MAX_KEY;index++){
mxJ& IV if(hCallWnd[index]==0){
qE&R.I!o hCallWnd[index]=hWnd;
|[}!E/7>b HotKey[index]=cKey;
yk|<P\ HotKeyMask[index]=cMask;
fSFb)+ bAdded=TRUE;
g",htYoEnj KeyCount++;
[~<X|_LG break;
U6@Hgi> }
:v!e8kM\x }
9I;d>% return bAdded;
]hL`HP }
t$lO~~atr e$3{URg BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
]e+88eQ {
?W(>Yefk BOOL bRemoved=FALSE;
z.q^`01/H for(int index=0;index<MAX_KEY;index++){
5dE@ePO[/9 if(hCallWnd[index]==hWnd){
2\p8U#"" if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
9zKrFqhNo hCallWnd[index]=NULL;
r2]KP(T8| HotKey[index]=0;
]%L?b-e HotKeyMask[index]=0;
`i,l)X] bRemoved=TRUE;
* Jy'3o KeyCount--;
ZYy?JDAO break;
j%m9y_rg} }
`'Af`u\R }
)E.!jL:g }
rVE!mi]% return bRemoved;
Pn*+g!` }
ROyG+dUy As;@T$G void VerifyWindow()
n@)Kf
A)& {
zMf. for(int i=0;i<MAX_KEY;i++){
vO#=]J8` if(hCallWnd
!=NULL){ D!-
78h
if(!IsWindow(hCallWnd)){ dC7YVs_,#
hCallWnd=NULL; $-}a<UFE;
HotKey=0; .m]"lH*
HotKeyMask=0; |KHaL?
KeyCount--; `H.~#$
} ,X05&'@Z
} a$*)d($
} N:]71+
} Wz~=JvRHh
s?8vs%(l
BOOL CHookApp::InitInstance() .I"Qu:``
{ bZE;}d
AFX_MANAGE_STATE(AfxGetStaticModuleState()); ")t
^!x(v
hins=AfxGetInstanceHandle(); Cz%tk}2
InitHotkey(); I0
78[3b
return CWinApp::InitInstance(); &?R2zfcM
} .S l{m[nV8
`5V=U9zdE
int CHookApp::ExitInstance() Z-fQ{&a{
{ c&{1Z&Y
VerifyWindow(); .K=r.tf~
UnInit(); ?+]prbt)
return CWinApp::ExitInstance(); 3~I|KF7x
} M?iU$qI
\{HbL,s
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file rff=ud>Jf
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) \pXs&}%1,F
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ SM;*vkwz~
#if _MSC_VER > 1000 i:6`Rmz1.
#pragma once ]ZD W+<
#endif // _MSC_VER > 1000 `u zR!^X
vU:FDkx*nn
class CCaptureDlg : public CDialog H\Y5Fd9)
{ ?*36&Iq}
// Construction ^u?#fLr
public: g ni=S~u
BOOL bTray; "0Wi-52=V
BOOL bRegistered; ! z^%$;p
BOOL RegisterHotkey(); N%hV +># Z
UCHAR cKey; eF[CiO8F2
UCHAR cMask; EqN<""2
void DeleteIcon(); FUVoKX!#
void AddIcon(); 9w^lRbn
UINT nCount; 3C,G~)=
x
void SaveBmp(); -|ho
8alF
CCaptureDlg(CWnd* pParent = NULL); // standard constructor TY(B]Q_o
// Dialog Data raWs6b4Q
//{{AFX_DATA(CCaptureDlg) ^PnXnH?
enum { IDD = IDD_CAPTURE_DIALOG }; r\OunGUP
CComboBox m_Key; WIe7>wkC
BOOL m_bControl; e;+6U"Jx*
BOOL m_bAlt; n9
LTrhLqp
BOOL m_bShift; x)Y?kVw21"
CString m_Path; Wchu-]
CString m_Number; toq/G,N Q
//}}AFX_DATA @H{QHi
// ClassWizard generated virtual function overrides NUlp4i~Q
//{{AFX_VIRTUAL(CCaptureDlg) D5o[z:V7"
public: ewo]-BQS
virtual BOOL PreTranslateMessage(MSG* pMsg); i++a^f
protected: $pV:)N4
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support YP^=b}
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); JHxy_<p/
//}}AFX_VIRTUAL /s@t-gTi
// Implementation 4pvT?s>68
protected: rBOxI
HICON m_hIcon; #GDnV/0)
// Generated message map functions m#}41<
//{{AFX_MSG(CCaptureDlg) 9O8na
'w
virtual BOOL OnInitDialog(); @/MI
Oxg[
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); /6=IL
afx_msg void OnPaint(); UZ5O%SF
afx_msg HCURSOR OnQueryDragIcon(); skd3E4
virtual void OnCancel(); RcZg/{[{
afx_msg void OnAbout(); -B`Nkc
afx_msg void OnBrowse(); scf.>K2
afx_msg void OnChange(); `D44I;e^1;
//}}AFX_MSG q*L>MV
DECLARE_MESSAGE_MAP() (Dy6I;S
}; >@b]t,rrK
#endif R`[jkJrc
B]KR *
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file {iGy@?d)zt
#include "stdafx.h" aVg~/
#include "Capture.h" Dq [f
#include "CaptureDlg.h" F@8G,$
#include <windowsx.h> XniPNU
#pragma comment(lib,"hook.lib") JPH! .@
#ifdef _DEBUG <r9L-4
#define new DEBUG_NEW '|I8byiK
#undef THIS_FILE xRX2u_f$<
static char THIS_FILE[] = __FILE__; Qm-I=Rh+
#endif FAkrM?0/
#define IDM_SHELL WM_USER+1 / [s TN.MG
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); YFJw<5&
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); oZD+AF$R
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; hTEwp.
class CAboutDlg : public CDialog 4YV0v,z
{ >>cb0fH5
public: ; _ziRy
CAboutDlg(); Tv d}5~
5?
// Dialog Data ]u]BxMs
//{{AFX_DATA(CAboutDlg) S/itK3
enum { IDD = IDD_ABOUTBOX }; - w{`/
//}}AFX_DATA y*G3dWb
// ClassWizard generated virtual function overrides UmR\2
cs
//{{AFX_VIRTUAL(CAboutDlg) `rLcJcW
protected: %O69A$Q[m
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support o>6c?Xi&
//}}AFX_VIRTUAL uPT2ga ]
// Implementation :*=fGwIWS
protected: `!udU,|N
//{{AFX_MSG(CAboutDlg) @A5'vf|2;.
//}}AFX_MSG lZ'WFFWLE
DECLARE_MESSAGE_MAP() qa\e`LD%Y
}; U<YcUmX
tx*L8'jlN
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) mn].8F
{ rAn:hR{
//{{AFX_DATA_INIT(CAboutDlg) +]3kcm7B
//}}AFX_DATA_INIT *;&[q{hz
} 'mELW)S
Hk1 [0)
void CAboutDlg::DoDataExchange(CDataExchange* pDX) O"M2*qiH
{ >\7Mf@c
CDialog::DoDataExchange(pDX); Ybk ydc
//{{AFX_DATA_MAP(CAboutDlg) *8bj3A]vf
//}}AFX_DATA_MAP VMee"'08
} 2q
NA\-0i>
[.(,vn?6
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 33=lR-N#
//{{AFX_MSG_MAP(CAboutDlg) EV'i/*v}\
// No message handlers w;{=
//}}AFX_MSG_MAP S4_C8
END_MESSAGE_MAP() gkM Q=;Nn
e7Sp?>-d
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) "5!T-Z+F
: CDialog(CCaptureDlg::IDD, pParent) \{a!Z&df
{ Ol
sX
//{{AFX_DATA_INIT(CCaptureDlg) O#do\:(b
m_bControl = FALSE; [ *~2Ts
m_bAlt = FALSE; ;e"dxAUe!^
m_bShift = FALSE; Tc.QzD\
m_Path = _T("c:\\"); 0H+!v
m_Number = _T("0 picture captured."); M
ZAz= )-
nCount=0; &7XsyDo6
bRegistered=FALSE; Ei7Oi!1
bTray=FALSE; FNw0x6,~R
//}}AFX_DATA_INIT hh-a+]
c0
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 |@1M'
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); TE5J
@I
} tb^/jzC
j "s7P%
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) j8G$ , ~v
{ lu?:1V-
CDialog::DoDataExchange(pDX); k%TBpG:T
//{{AFX_DATA_MAP(CCaptureDlg) bZ>dr{%%e
DDX_Control(pDX, IDC_KEY, m_Key); #`ZBA>FLaQ
DDX_Check(pDX, IDC_CONTROL, m_bControl); AxfQ{>)0
DDX_Check(pDX, IDC_ALT, m_bAlt); <}p]0iA
DDX_Check(pDX, IDC_SHIFT, m_bShift); WfXwI 'y
DDX_Text(pDX, IDC_PATH, m_Path); '~9w<dSB!r
DDX_Text(pDX, IDC_NUMBER, m_Number); `Frr?.3&-
//}}AFX_DATA_MAP +lX Iv
} TVM19)9
.0rTk$B
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) S,s#D9NU
//{{AFX_MSG_MAP(CCaptureDlg) M2$Hb_S{
ON_WM_SYSCOMMAND() y9N6!M|'y
ON_WM_PAINT() [}=a6Q>)
ON_WM_QUERYDRAGICON() DbSR(:
ON_BN_CLICKED(ID_ABOUT, OnAbout) }1DzWS-hh
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) /iEQ}
ON_BN_CLICKED(ID_CHANGE, OnChange) Ne)3@?
//}}AFX_MSG_MAP 1l'JoU.<
END_MESSAGE_MAP() o%,?v
9
y`i?Qo3
BOOL CCaptureDlg::OnInitDialog() D<`M<:nq
{ drxCjuz"
CDialog::OnInitDialog(); 25Ro
)5
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); k. NJ+
ASSERT(IDM_ABOUTBOX < 0xF000); [4hi/60
CMenu* pSysMenu = GetSystemMenu(FALSE); *10qP?0H
if (pSysMenu != NULL) Om*(dK]zHQ
{ c*y*UG
CString strAboutMenu; O#k eoC4
strAboutMenu.LoadString(IDS_ABOUTBOX); x_x_TEyy h
if (!strAboutMenu.IsEmpty()) (hBph+
{ o`Af6C;Q
pSysMenu->AppendMenu(MF_SEPARATOR); Ifokg~X~G
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); >,QCKZH
} yk'L_M(=
} E4'z
SetIcon(m_hIcon, TRUE); // Set big icon (<
>L fn
SetIcon(m_hIcon, FALSE); // Set small icon L]%!YP\<T
m_Key.SetCurSel(0); ORM3oucP
RegisterHotkey(); ~"_!O+Pj
CMenu* pMenu=GetSystemMenu(FALSE); #].qjOj
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); tLU@&NY`
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 4TI`
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); U)M&AYb
return TRUE; // return TRUE unless you set the focus to a control <5"&]!
.
} &8pGq./lr=
!C|Z+w9Y
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 3 l}9'j
{ ~;z]
_`_Va
if ((nID & 0xFFF0) == IDM_ABOUTBOX) M~7Cb>%<
{ VC0Tqk
CAboutDlg dlgAbout; &Z3%UOY
dlgAbout.DoModal(); 8f1M6GK?
} Bd 0oA
)i
else kBLFK3i
{ 6"o=`Sq
CDialog::OnSysCommand(nID, lParam); omGzyuPF
} Qv`: E
} S?6-I,]h
2
6DX4
void CCaptureDlg::OnPaint() Hj(K*z
{ c|(J%@B)
if (IsIconic()) Caz5q|Oo
{ Lq$ig8V:O7
CPaintDC dc(this); // device context for painting yMu G? x+
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); (7N!Jvg9
// Center icon in client rectangle i=*H|)
int cxIcon = GetSystemMetrics(SM_CXICON); >tPf.xI|l
int cyIcon = GetSystemMetrics(SM_CYICON); {8qcM8
CRect rect; 1Jdx#K
GetClientRect(&rect); >kxRsiKV
int x = (rect.Width() - cxIcon + 1) / 2; U?d
I
int y = (rect.Height() - cyIcon + 1) / 2; _VRxI4q
// Draw the icon P(FlU]q
dc.DrawIcon(x, y, m_hIcon); 5|~nX8>
} 6K )K%a,9
else B=;kC#Emtf
{ H2H[ DVKv
CDialog::OnPaint(); XI|k,Ko<
} Rnoz[1y?0
} c ~~4eia)
0e+#{k
HCURSOR CCaptureDlg::OnQueryDragIcon() Wz#Cyjo
{ )/vom6y*
return (HCURSOR) m_hIcon; !h4A7KBYG
} ,Jh#$mil
9l"=]7~%
void CCaptureDlg::OnCancel() 7y3WV95Z\
{ =.CiKV$E
if(bTray) BgD3P.;[
DeleteIcon(); pW@W-k:u
CDialog::OnCancel(); -.y1]4
} [|YvVA
/g.c(-#]
void CCaptureDlg::OnAbout() :.-z!
{ vK@UK"m
CAboutDlg dlg; tc[z/
dlg.DoModal(); =Gu&0f
} u8.Tu7~
.)$MZyo
void CCaptureDlg::OnBrowse() z/+{QBen8
{ EPH
n"YK
CString str; T*SLM"x
BROWSEINFO bi; 54Rp0otv
char name[MAX_PATH]; |&{S ~^$
ZeroMemory(&bi,sizeof(BROWSEINFO)); M49l2x=]9
bi.hwndOwner=GetSafeHwnd(); :N _]*>
bi.pszDisplayName=name; >qOG^{&x
bi.lpszTitle="Select folder"; Y2XxfZj
bi.ulFlags=BIF_RETURNONLYFSDIRS; ~-6_-Y|
LPITEMIDLIST idl=SHBrowseForFolder(&bi); Y%kOq`uT=n
if(idl==NULL) vpf.0!zh
return; f,E7eL@
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); PuREqa\_[
str.ReleaseBuffer(); FG[rH]
m_Path=str; lct
if(str.GetAt(str.GetLength()-1)!='\\') YC8IwyL'
m_Path+="\\"; lq "X_M$
UpdateData(FALSE); -z+,j(@
} [tof+0Y6
lH`TF_
void CCaptureDlg::SaveBmp() h2T\%V_j
{ /{`"X_.o
CDC dc; &.?E[db"h
dc.CreateDC("DISPLAY",NULL,NULL,NULL); s5{=lP
CBitmap bm; l*z%Jw
int Width=GetSystemMetrics(SM_CXSCREEN); |u?VlRt
int Height=GetSystemMetrics(SM_CYSCREEN); 1s@QsZ3
bm.CreateCompatibleBitmap(&dc,Width,Height); xl`AiO `K
CDC tdc; zs Q|LwQ
tdc.CreateCompatibleDC(&dc); K$Vu[!l`
CBitmap*pOld=tdc.SelectObject(&bm); *|g[Mn
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 2[Lv_<i|
tdc.SelectObject(pOld); *l{epum;
BITMAP btm; O+|C<;K
bm.GetBitmap(&btm); n<j+KD#a
DWORD size=btm.bmWidthBytes*btm.bmHeight; Pb>/b\&JS
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); YLQ0UeDN'
BITMAPINFOHEADER bih; ws5Ue4g|
bih.biBitCount=btm.bmBitsPixel; z9[TjTH^}T
bih.biClrImportant=0; WYTqQqQk
bih.biClrUsed=0; #f) TAA
bih.biCompression=0; vs=q<Uw)
bih.biHeight=btm.bmHeight; "lw|EpQk`
bih.biPlanes=1; |&JeJ0k>~
bih.biSize=sizeof(BITMAPINFOHEADER); }}$@Tij19[
bih.biSizeImage=size; Znb7OF^#"
bih.biWidth=btm.bmWidth; O#ZZ PJ"
bih.biXPelsPerMeter=0; QHZ",1F
bih.biYPelsPerMeter=0; p__wBUB
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); cbyzZ#WRb
static int filecount=0; p9?kJKN
CString name; ^@AyC"K
name.Format("pict%04d.bmp",filecount++); -)oUb=Lk{
name=m_Path+name; [ ,Go*r
BITMAPFILEHEADER bfh; }' AY#g
bfh.bfReserved1=bfh.bfReserved2=0; #l4T/`u'9!
bfh.bfType=((WORD)('M'<< 8)|'B'); EZ .3Z`
bfh.bfSize=54+size; )S%t)}
bfh.bfOffBits=54; iBAP,cR?`
CFile bf; 2=NaqHt(
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ )
yMrET
m
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); iO5g30l
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 0GrM:Lh y
bf.WriteHuge(lpData,size); YPI)^ }
bf.Close(); c**&, aL
nCount++; c#}K,joeU
} Q l)hIf$Oo
GlobalFreePtr(lpData); i m;6$3
if(nCount==1) B ??07j
m_Number.Format("%d picture captured.",nCount); j8&NscK)
else $N)G:=M!s
m_Number.Format("%d pictures captured.",nCount); {m>ylE
UpdateData(FALSE); kaekH*m~
} *C5`LgeX
ulIEx~qP
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 5F~l;zT
{ \6SjJ]o>
if(pMsg -> message == WM_KEYDOWN) ]qv0Y~+`-K
{ Yu3S3aRE
if(pMsg -> wParam == VK_ESCAPE) 4G(7V:
return TRUE; K'r;#I|"J
if(pMsg -> wParam == VK_RETURN) l(sVnhL6h
return TRUE; %/y=_G
} #mu L-V
return CDialog::PreTranslateMessage(pMsg); (~^fx\-S
} 2uE<mjCt-r
6I@j$edZ
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) k(dakFaC^
{ 6Kpq~o
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ i)z|=
|?
SaveBmp(); Q!1 ;xw~
return FALSE; WZNq!K H
} &[-(=43@
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ xeU|5-d'
CMenu pop; ~%/Rc`
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); zg<-%r'$
CMenu*pMenu=pop.GetSubMenu(0); .
|T=T0^
pMenu->SetDefaultItem(ID_EXITICON); b/z-W`gw
CPoint pt; ja_8n["z
GetCursorPos(&pt); J/4T =:\
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); %Gh5!e:$SI
if(id==ID_EXITICON) Lkm-<
DeleteIcon(); =WY'n
l'
else if(id==ID_EXIT) 1z-.e$&z
OnCancel(); Kk8}m;
return FALSE; ~U&NY7.@
} 7a'yO+7-)
LRESULT res= CDialog::WindowProc(message, wParam, lParam); H>EM3cFU
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) sg
$db62>
AddIcon(); INi$-Y+
return res; lln"c
} z5fE<=<X_W
njy2pDC@
void CCaptureDlg::AddIcon() :jl*Y-mM
{ {]R'U/
NOTIFYICONDATA data;
XA2Ld
data.cbSize=sizeof(NOTIFYICONDATA); NZq-%bE
CString tip; ccuGM W G*
tip.LoadString(IDS_ICONTIP); .c"nDCFVR
data.hIcon=GetIcon(0); QF"7.~~2
data.hWnd=GetSafeHwnd(); 9b+jT{Tg
strcpy(data.szTip,tip); !LN8=u.
data.uCallbackMessage=IDM_SHELL; V*4Z.3/E5
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; &F&`y
data.uID=98; 15g!Q
*v
Shell_NotifyIcon(NIM_ADD,&data); ,&t+D-s<f
ShowWindow(SW_HIDE); !!1?2ine
bTray=TRUE; dE7x
SI
} IK2da@V
I@'[> t
void CCaptureDlg::DeleteIcon() 6 Xvpk1
{ ]<f)Rf">:`
NOTIFYICONDATA data; a$My6Qa#
data.cbSize=sizeof(NOTIFYICONDATA); 7]h %?W!
data.hWnd=GetSafeHwnd(); ]ZY2\'
data.uID=98; $xbC^ k
Shell_NotifyIcon(NIM_DELETE,&data); 9pp+<c
ShowWindow(SW_SHOW); ;28d7e}
SetForegroundWindow(); *r`=hNr
ShowWindow(SW_SHOWNORMAL); v/`D0g-uX)
bTray=FALSE; (u,)v_Oo]a
} c?A$Y?|9
}\"EI<$s
void CCaptureDlg::OnChange() 3Zb%-_%j
{ a('0l2e<u9
RegisterHotkey(); &GP(yj]
} /s\ mV
}T?X6LA$I8
BOOL CCaptureDlg::RegisterHotkey() }Ce9R2
{ 7OV^>"S
UpdateData(); YJJ1N/Z1
UCHAR mask=0; AjVC{\Ik
UCHAR key=0; m!V,W*RNr
if(m_bControl) k"N>pjgd$
mask|=4; yE$PLM
if(m_bAlt) R}&?9tVRR
mask|=2; :;k?/KU7
if(m_bShift) PF{uaKWk
mask|=1; 66v,/#K
key=Key_Table[m_Key.GetCurSel()]; 7d: ]o>
if(bRegistered){ /G||_Hc
DeleteHotkey(GetSafeHwnd(),cKey,cMask); > G\0Z[<v,
bRegistered=FALSE; zwfft
} HXLnjXoe
cMask=mask; 6>vR5pn
cKey=key; FOTe,F.8
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); C(N'=-;Kl
return bRegistered; %rW}x[M%w?
} 7H6Ts8^S
0j$\k|xFXZ
四、小结 gX}'b\zxC
;2f=d_/x
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。