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:
6<@mBZ
;|K
} 一、实现方法
Xc+YoA0Ez xJ<RQCW$ 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:
^/Hf$tYI!` hpQ #`rhn #pragma data_seg("shareddata")
1q;R+65 HHOOK hHook =NULL; //钩子句柄
6 wd UINT nHookCount =0; //挂接的程序数目
'{0O!y[H6 static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
P'iX?+* static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
g@x72$j static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
vE`;1UA} static int KeyCount =0;
cFie;k static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
j)G%I y[` #pragma data_seg()
m\*ca3$ bv <^zuV 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。
?1g`'q@T% o#"yFP1 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_a{iMVP Zbl*U(KU? BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
*0oa2fz% cKey,UCHAR cMask)
*DcIC]ao[ {
AHr^G' BOOL bAdded=FALSE;
/V0Put for(int index=0;index<MAX_KEY;index++){
]u<U[l-w if(hCallWnd[index]==0){
4 dHGU^#WZ hCallWnd[index]=hWnd;
EO(l?Fgw]$ HotKey[index]=cKey;
?r=`Kl HotKeyMask[index]=cMask;
t,TlW^- bAdded=TRUE;
g_ep
5#\D KeyCount++;
7V^j9TC break;
K8KN<Q s] }
E9k%:&]vd }
|:SV=T: return bAdded;
|Zn;O6c#L5 }
"1""1"; //删除热键
wY8Vc" BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
GZ<@#~1%\ {
_[8JSw7 BOOL bRemoved=FALSE;
>9XG+f66E for(int index=0;index<MAX_KEY;index++){
C%z9Q if(hCallWnd[index]==hWnd){
qm#?DSLap if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
j/O9LygB hCallWnd[index]=NULL;
^{J^oZ'%~ HotKey[index]=0;
<NDV 5P HotKeyMask[index]=0;
44n41.Q] bRemoved=TRUE;
U1 3Lsky% KeyCount--;
A"DGn break;
-mO<(wfV> }
x-@?:P* }
n9
bp0#K }
G~_eBy return bRemoved;
;[lLFI }
>g+Y//Z ej7N5~!,s 6}@T^? DLL中的钩子函数如下:
UCmJQJc .FYRi_Zd LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
h+dk2|a {
)y!gApNs" BOOL bProcessed=FALSE;
3bLOT#t if(HC_ACTION==nCode)
e7iQG@i7 {
6t<[- if((lParam&0xc0000000)==0xc0000000){// 有键松开
X,M!Tp switch(wParam)
~D/Lo$K" {
$0{h Uex case VK_MENU:
}|-8-; MaskBits&=~ALTBIT;
B~Z61 break;
j AoI`J case VK_CONTROL:
"AqLR MaskBits&=~CTRLBIT;
`{yD\qDyX break;
<Qbqxw case VK_SHIFT:
zB7^L^Y MaskBits&=~SHIFTBIT;
u ?F},VL; break;
"a _S7K default: //judge the key and send message
Zq:
}SU break;
W }Ll)7(|T }
[N*S5^>1 for(int index=0;index<MAX_KEY;index++){
OvC@E]/+ if(hCallWnd[index]==NULL)
MD;,O3Ge continue;
&H,UWtU+ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
g
C8deC8 {
PHez5 }T SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
iN Lt4F[i bProcessed=TRUE;
),o=~,v: }
\/wk!mWV@ }
BD.l 5~: }
:hB6-CZkqN else if((lParam&0xc000ffff)==1){ //有键按下
A[Ce3m switch(wParam)
.ezko\nU {
b
V_<5PHP case VK_MENU:
rCGKE`H MaskBits|=ALTBIT;
Q[!?SSX% break;
v!S(T];) case VK_CONTROL:
F_}y[Yn^ MaskBits|=CTRLBIT;
}
?+0s=Z break;
I_Gm2Dd case VK_SHIFT:
q|lP?-j MaskBits|=SHIFTBIT;
dn%'bt break;
RXWdqaENx default: //judge the key and send message
KI\
9) break;
A|mE3q= }
q` |E9 for(int index=0;index<MAX_KEY;index++){
su60j^e* if(hCallWnd[index]==NULL)
EcR[b@YI continue;
t1#f*G5 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
k9y/.Mu {
>FFp"%% SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
0!c/4^ bProcessed=TRUE;
kmJ<AnK }
tsB}'+!v# }
g]b%<DJ }
21?>rezJ if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
pXNH for(int index=0;index<MAX_KEY;index++){
aO:A pOAO if(hCallWnd[index]==NULL)
xy)W_~Mk continue;
:W'.SRD if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
JV;VR9-l SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
-S@ ys //lParam的意义可看MSDN中WM_KEYDOWN部分
v49i.c9 }
1
!.PH }
I=E\=UTG,5 }
;$r!eFY; return CallNextHookEx( hHook, nCode, wParam, lParam );
Nw1 .x }
*z'Rl'j9[ hz2f7g 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:
4l{La}Aj fhHTp_u)2 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
P6'0:M@5 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
~4 S6c=: } f!wQxb 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:
7,{!a56zX \3t)7.:4 LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
AUU(fy#< {
b Sg]FB aW if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
;UQ&yj%x {
TU2MG VYy //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
Pi[(xD8 SaveBmp();
M%eTNsbNm return FALSE;
lzz68cT }
=*WfS^O …… //其它处理及默认处理
fb!>@@9Z }
8L))@SA+uJ w (,x{Bg\ NCx)zJ\S 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。
UXS+GAWU p!(]`N 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
cPl$N5/5 cc3+Wx_ 二、编程步骤
_ =(v? 2:? K+U0YMRmz 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
cn
;2& ;sSRv9Xb 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
\D! I"mr g+k
yvI7o 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
Ys%d x1`Jlzrp, 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
j+3=&PkA.] )5U7w 5、 添加代码,编译运行程序。
[4}U*\/>C *_uGzGB&G 三、程序代码
^ s/f.#' kPp7;U2A ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
6)3pnhG9 #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
|=Pw-uk #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
^+dL7g?+ #if _MSC_VER > 1000
eG5xJA^ #pragma once
KlRIJOS #endif // _MSC_VER > 1000
eKqo6P:#f #ifndef __AFXWIN_H__
f:A1j\A? #error include 'stdafx.h' before including this file for PCH
5bprhq-7 #endif
k?Iq 6 #include "resource.h" // main symbols
0~nub class CHookApp : public CWinApp
MJ@PAwv" {
rge/qUr/^ public:
:LR>U;2
CHookApp();
SDW!9jm>R // Overrides
@(e/Y/ // ClassWizard generated virtual function overrides
TP)}1@ //{{AFX_VIRTUAL(CHookApp)
safI`bw1 public:
hzy#%FaB virtual BOOL InitInstance();
4{=^J2z virtual int ExitInstance();
b U>.Bp] //}}AFX_VIRTUAL
, *Z!Bd8 //{{AFX_MSG(CHookApp)
<3bFt [ // NOTE - the ClassWizard will add and remove member functions here.
Y X{F$BM // DO NOT EDIT what you see in these blocks of generated code !
=&?BPhJE //}}AFX_MSG
h Qbz}x DECLARE_MESSAGE_MAP()
*h"7!g };
bX&=*L+h6 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
jL#`CD BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
Bjsg!^X7 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
\w@ "`!% BOOL InitHotkey();
(,
uW- BOOL UnInit();
>o!~T}J7 #endif
J?bx<$C@ CF@j]I@{
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
8}!WJ2[R #include "stdafx.h"
'di(5 #include "hook.h"
Eg#WR&Uq" #include <windowsx.h>
ksli-Px #ifdef _DEBUG
e:RgCDWL #define new DEBUG_NEW
XRWy#Pj #undef THIS_FILE
agPTY{; static char THIS_FILE[] = __FILE__;
10e~Yc #endif
1ihdH1rg[ #define MAX_KEY 100
[-JU(:Rh #define CTRLBIT 0x04
zM|Y
X< #define ALTBIT 0x02
&\M<>>IB #define SHIFTBIT 0x01
ABnJ{$=n# #pragma data_seg("shareddata")
_{YUWV50} HHOOK hHook =NULL;
Vqxxm&^P UINT nHookCount =0;
GUqBnRA8j static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
@L5s.]vg= static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
V82N8-l static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
h2m@Q={ static int KeyCount =0;
xIa8Ac static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
Z(a,$__ #pragma data_seg()
3g5
n>8- HINSTANCE hins;
/X97dF)zt void VerifyWindow();
59M\uVWR BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
a}/ A]mu //{{AFX_MSG_MAP(CHookApp)
8{4jlL;"`? // NOTE - the ClassWizard will add and remove mapping macros here.
}:hN}*H // DO NOT EDIT what you see in these blocks of generated code!
/}$D&KwYg //}}AFX_MSG_MAP
7y'2 END_MESSAGE_MAP()
aqN6.t J`d;I#R%c CHookApp::CHookApp()
._US8 {
+I r // TODO: add construction code here,
C7T}:V](q // Place all significant initialization in InitInstance
F'9#dR? }
L~>~a1p! @j=Q$k.GF CHookApp theApp;
jS| 9jg: LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
%*Lv {
k^*S3#" BOOL bProcessed=FALSE;
3/0E9' if(HC_ACTION==nCode)
jLv8K {
4S3uzy% if((lParam&0xc0000000)==0xc0000000){// Key up
)V?:qCuY> switch(wParam)
N)^`
15w {
{E$smX case VK_MENU:
6k*,Yei MaskBits&=~ALTBIT;
Ni-@El99 break;
g.T:72" case VK_CONTROL:
swLrp
74 MaskBits&=~CTRLBIT;
8XdgtYm break;
S!+}\* case VK_SHIFT:
eNX!EN(^ MaskBits&=~SHIFTBIT;
x /E<@?*: break;
bE>"DPq default: //judge the key and send message
?_nbaFQK3 break;
-]kvM }
;HoBLxb P
for(int index=0;index<MAX_KEY;index++){
.l$:0a if(hCallWnd[index]==NULL)
h0)Dj(C continue;
k}FmdaPI' if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
I::|d,bR! {
]YWz;Z SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
H[D<G9: bProcessed=TRUE;
$u
P'> }
85Red~-M }
,v$Q:n| }
r6gfxW5 else if((lParam&0xc000ffff)==1){ //Key down
&ws^Dm]R switch(wParam)
fv/Nf" {
qvG@kuz8g5 case VK_MENU:
xY>@GSO1 MaskBits|=ALTBIT;
rc`}QoB)R break;
_ UGR+0'Q\ case VK_CONTROL:
z~(3S8$ MaskBits|=CTRLBIT;
H?_>wQj& break;
z1S
p'h$ case VK_SHIFT:
6&`hf > MaskBits|=SHIFTBIT;
H<Ik.]m
break;
M)1Y7?r] default: //judge the key and send message
~EtwX YkRZ break;
x>$e* }
VMIX=gTZ for(int index=0;index<MAX_KEY;index++)
7-# {
+FJ+,|i if(hCallWnd[index]==NULL)
R,dbq4xkl continue;
9wbj}tN\z if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
TQ5*z,CkS {
M`)/^S9 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
a]nK!;>$ bProcessed=TRUE;
1Y'NG<d_ }
H5>?{(m }
a&RH_L jM }
K*S3{s%UR if(!bProcessed){
#g= for(int index=0;index<MAX_KEY;index++){
/odDJxJ
k if(hCallWnd[index]==NULL)
.bY
R continue;
N> xdX5 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
j9xu21'!% SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
)k.}>0K | }
zd|n!3; }
5y8VA4L/o }
%%FzBbWAO return CallNextHookEx( hHook, nCode, wParam, lParam );
D9h }
HT
."J Q@KCODi BOOL InitHotkey()
55Y a(E {
7z q@T] if(hHook!=NULL){
Z0%:j\W4c nHookCount++;
4i7+'F return TRUE;
49.B!DqQW& }
N@0cn
q:" else
ny1;]_X_ hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
rXP~k]tC if(hHook!=NULL)
_;M3=MTM9 nHookCount++;
F:N8{puq5 return (hHook!=NULL);
vb6kr?-i* }
i&YWutG BOOL UnInit()
l"-Z#[ {
o$Ju\(Y$<+ if(nHookCount>1){
&-Ylj nHookCount--;
Z C<+BKS return TRUE;
-}3nIk<N }
Vh{(*p BOOL unhooked = UnhookWindowsHookEx(hHook);
Z@(KZ| if(unhooked==TRUE){
TJCE6QG nHookCount=0;
l];/,J^ hHook=NULL;
6n^@Ps }
RdBIbm return unhooked;
"+E\os72| }
P ; h8 X,{ 3_ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
+z4E:v {
&`oybm-p( BOOL bAdded=FALSE;
TV=K3F5)M for(int index=0;index<MAX_KEY;index++){
McpQ7\*h if(hCallWnd[index]==0){
ocu,qL)W hCallWnd[index]=hWnd;
m?kyAW'| HotKey[index]=cKey;
Dxy^r*B HotKeyMask[index]=cMask;
t)1`^W} bAdded=TRUE;
1yVhO2`7] KeyCount++;
v7n@CWnN break;
||?@pn\ }
!Au#j^5K-o }
Q(36RX%@ return bAdded;
V';l H2 }
F$bV}>-1k 7[PEiAI BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
A=3L_
#nO {
:bm%f%gg BOOL bRemoved=FALSE;
vA}_x7}n( for(int index=0;index<MAX_KEY;index++){
l0C`teO
if(hCallWnd[index]==hWnd){
u"4B5D if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
Evd|_ W- hCallWnd[index]=NULL;
cPv(VjS1; HotKey[index]=0;
bf|ePGW? HotKeyMask[index]=0;
3~VV2O bRemoved=TRUE;
|c^ ?tR< KeyCount--;
1jej7p>K break;
`nKN|6o#x }
^=5x1<a9$ }
+IO>% }
H8B$#. return bRemoved;
z:4_f:70 }
{
:1XN 'ZB^=T void VerifyWindow()
Qe{w)e0}` {
`XpQR=IOMb for(int i=0;i<MAX_KEY;i++){
z$WLx if(hCallWnd
!=NULL){ X8">DR&>Y
if(!IsWindow(hCallWnd)){ u~aRFQ:
hCallWnd=NULL; Qz3Z_V4k9
HotKey=0; aL%E#
HotKeyMask=0; |R1T;J<[
KeyCount--; g/fpXO\
} k%FA:ms|k
} GX0zirz
} n}j6gN! O
} 9!
/kyyU
a{.q/Tbt
BOOL CHookApp::InitInstance() px"H
{ P:t .Nr"
AFX_MANAGE_STATE(AfxGetStaticModuleState()); a eeor
hins=AfxGetInstanceHandle(); MM_:2 ^P)
InitHotkey(); +D:8r|evH
return CWinApp::InitInstance(); -rn6ZSD)
} 'It8h$^j
@0 /qP<E
int CHookApp::ExitInstance() e"52'zAV-
{ ~7 U~
VerifyWindow(); r4fHD~#l{
UnInit(); c(e>Rmh
return CWinApp::ExitInstance(); p |1u,N
} h='F,r5#2
t`&x.o
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 8lL|j
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) tKeTHj;jO
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ q;")
#if _MSC_VER > 1000 uINdeq 7|F
#pragma once hd u2?v@
#endif // _MSC_VER > 1000 8M@'A5]
[d8Q AO1;)
class CCaptureDlg : public CDialog RGE(#
{ {X&lgj
// Construction 80wzn,o
S
public: &8z<~q
BOOL bTray; qQi\/~Y[:
BOOL bRegistered; 4]uj+J
BOOL RegisterHotkey(); eM:J_>7t
UCHAR cKey; Iz5NA0[=2
UCHAR cMask; _BmObXOp.
void DeleteIcon(); Ph1XI&us9
void AddIcon(); =i&,I{3
UINT nCount; 'Vo8|?.WhX
void SaveBmp(); S k~"-HL|
CCaptureDlg(CWnd* pParent = NULL); // standard constructor CMaph
// Dialog Data 52dD(
//{{AFX_DATA(CCaptureDlg) ylKK!vRHT
enum { IDD = IDD_CAPTURE_DIALOG }; RHg-Cg`
CComboBox m_Key; . \"k49M`
BOOL m_bControl; 0{|HRiQH9+
BOOL m_bAlt; k=hWYe$iAz
BOOL m_bShift; 8~]D!c8; a
CString m_Path; odsFgh
CString m_Number; AQg|lKv
//}}AFX_DATA akxNT_
// ClassWizard generated virtual function overrides r8Mx+r
//{{AFX_VIRTUAL(CCaptureDlg) fq]PKLW'
public: RhH1nf2UR
virtual BOOL PreTranslateMessage(MSG* pMsg); S@FO&o 0
protected: &~
y)b`r
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support |4Q*4s
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 9)ALJd,M
//}}AFX_VIRTUAL La;G S
// Implementation Aw |;C
protected: }OL"38P
HICON m_hIcon; `t&{^ a&Y"
// Generated message map functions |)29"_Kk5
//{{AFX_MSG(CCaptureDlg) jC9us>b
virtual BOOL OnInitDialog(); yZ|"qP1
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); .h7s.p?
afx_msg void OnPaint(); g[3LPKQ
afx_msg HCURSOR OnQueryDragIcon(); $'498%K2
virtual void OnCancel(); t'vt'[~,U
afx_msg void OnAbout(); 0jf6 z-4
afx_msg void OnBrowse(); \ ;npdFy
afx_msg void OnChange(); ,vJt!}}
//}}AFX_MSG HYmC3
DECLARE_MESSAGE_MAP() l%0bF9\
}; " B#|C'
#endif Yf w>x[#e
?m
|}}a
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file mm-s?+&M;
#include "stdafx.h" ZgP%sF
#include "Capture.h" uZS :
#include "CaptureDlg.h" CJBf5I3
#include <windowsx.h> -{cHp
#pragma comment(lib,"hook.lib") 6Dlm.~G
#ifdef _DEBUG O?JJE8~']
#define new DEBUG_NEW NXU:b"G
S
#undef THIS_FILE V&M*,#(?
static char THIS_FILE[] = __FILE__; 3'0Pl8
#endif _rT\?//B
#define IDM_SHELL WM_USER+1 CubQ6@,
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); .$qa?$@
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); G<;~nAo?f0
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Ymk?@mV4
class CAboutDlg : public CDialog Gt9$hB7
{ 2 |s ohF
public: (^d7K:-'
CAboutDlg(); Je1d|1!3
// Dialog Data bbK};u
//{{AFX_DATA(CAboutDlg) / (&E
enum { IDD = IDD_ABOUTBOX }; C82_)@96
//}}AFX_DATA ~~tTr$
// ClassWizard generated virtual function overrides ~[g(@Xt
//{{AFX_VIRTUAL(CAboutDlg) M&Ka^h;N
protected: LVj1NP
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 94u{k1d x
//}}AFX_VIRTUAL .+9hm|
// Implementation *@2Bh4
protected: VY0.]t
//{{AFX_MSG(CAboutDlg) n~N>;mP
//}}AFX_MSG ]gk1q{Ql<
DECLARE_MESSAGE_MAP() Z*%;;&?
}; m1"m KM
8i#
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Rh!UbEPjC
{ 06&J!,p
:
//{{AFX_DATA_INIT(CAboutDlg) :C~Ar]
//}}AFX_DATA_INIT Ott6y
} 5)k8(kH
uN|A}/hr]
void CAboutDlg::DoDataExchange(CDataExchange* pDX) _R4}\3}!
{ 9%!h/m>rW
CDialog::DoDataExchange(pDX); [GLH8R
//{{AFX_DATA_MAP(CAboutDlg) BG>Y[u\N
//}}AFX_DATA_MAP "yn~axk7
} x84!/n^z
:xh{SsW@
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) u6qK4*eAD
//{{AFX_MSG_MAP(CAboutDlg) 3nq?Y8yac
// No message handlers +)Z]<O
//}}AFX_MSG_MAP fE#(M +(<
END_MESSAGE_MAP() diq}\'f
D'"
T'@
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) BuJo W@)
: CDialog(CCaptureDlg::IDD, pParent) NB-dlv1
{ oxwbq=a6yV
//{{AFX_DATA_INIT(CCaptureDlg) [2%[~&4
m_bControl = FALSE; 1K72}Gj)ZL
m_bAlt = FALSE; @IT[-d
m_bShift = FALSE; j]Auun
m_Path = _T("c:\\"); o>el"0rn.h
m_Number = _T("0 picture captured."); DD|0?i
nCount=0; ( ;FxKm<P@
bRegistered=FALSE; DJP6Z
bTray=FALSE; 2;}leZ@U
//}}AFX_DATA_INIT jk AjYR .
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 zTz}H*U
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); `c`VIq?
} Ma YU%h0
`zd,^.i5~
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) vCzZjGBY
{ ]%\,.&=hT
CDialog::DoDataExchange(pDX); +>ju,;4WK
//{{AFX_DATA_MAP(CCaptureDlg) fqNh\~kja
DDX_Control(pDX, IDC_KEY, m_Key); [GwAm>k
DDX_Check(pDX, IDC_CONTROL, m_bControl); -9Q(3$}
DDX_Check(pDX, IDC_ALT, m_bAlt); Lkt4F
DDX_Check(pDX, IDC_SHIFT, m_bShift); &qv~)ZM$
DDX_Text(pDX, IDC_PATH, m_Path); Y0LZbT3
DDX_Text(pDX, IDC_NUMBER, m_Number); IkrB}
//}}AFX_DATA_MAP Y-VDi.]W
} ]z'&oz
=~D? K9o
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) iSW2I~PD
//{{AFX_MSG_MAP(CCaptureDlg) d
t/AAk6
ON_WM_SYSCOMMAND() 0YH5B5b
ON_WM_PAINT() twT/uBQ4a
ON_WM_QUERYDRAGICON() -'rdN i
ON_BN_CLICKED(ID_ABOUT, OnAbout) X+hHE kJ
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Z%t_1t
ON_BN_CLICKED(ID_CHANGE, OnChange) 6FUW^dt
//}}AFX_MSG_MAP YEL0h0gn
END_MESSAGE_MAP() }LHYcNw^z
^&zCPUH
BOOL CCaptureDlg::OnInitDialog() =|t-0'RsN
{ UhxM85M;x
CDialog::OnInitDialog(); MK&,2>m,A
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); u[>"_!T
ASSERT(IDM_ABOUTBOX < 0xF000); *t@A-Sn
CMenu* pSysMenu = GetSystemMenu(FALSE); T(J'p4
if (pSysMenu != NULL) LGP"S5V
{ VtBC~?2U)B
CString strAboutMenu; YIQD9
strAboutMenu.LoadString(IDS_ABOUTBOX); yx-{PjX
if (!strAboutMenu.IsEmpty()) b!<_ JOL2.
{ s :vNr@TS
pSysMenu->AppendMenu(MF_SEPARATOR); qBA)5Sv\V
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); b--=GY))F
} ~Y 6'sM|
} O<u=Vz3c~0
SetIcon(m_hIcon, TRUE); // Set big icon L2}\Ah"[
SetIcon(m_hIcon, FALSE); // Set small icon /6x&%G:m#
m_Key.SetCurSel(0); 8 Rx@_
RegisterHotkey(); l|CM/(99-
CMenu* pMenu=GetSystemMenu(FALSE); _N DQ2O
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); uP~,]ci7
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ^T=9j.e'ja
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); B8&q$QV
return TRUE; // return TRUE unless you set the focus to a control q_M N
} \PrJy6&
iw@rW5%'~
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) L9b.D<
{ s~M4. 06P
if ((nID & 0xFFF0) == IDM_ABOUTBOX) +^.Yt0}
{ umYsO.8
CAboutDlg dlgAbout; ]so/AdT9hA
dlgAbout.DoModal(); m`yvZ4K!
} >m%_`68
else y>o:5':;'
{ ^y<^hKjV
CDialog::OnSysCommand(nID, lParam); E`HoJhB
} -hd
} L.n@;*
c_/BS n
void CCaptureDlg::OnPaint() Y}~sTuWU
{ -@v^. @[Z&
if (IsIconic()) Lg:1zC
{ |G j.E
CPaintDC dc(this); // device context for painting tUu'
gs|
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 2/-m-5A
// Center icon in client rectangle SN6 QX!3
int cxIcon = GetSystemMetrics(SM_CXICON); pPReo)
int cyIcon = GetSystemMetrics(SM_CYICON); $LP(\T([
CRect rect; &RR;'wLoQT
GetClientRect(&rect); $^x=i;>aK.
int x = (rect.Width() - cxIcon + 1) / 2;
f<o|5r
int y = (rect.Height() - cyIcon + 1) / 2; Z+xkN
// Draw the icon .k#PrT1C
dc.DrawIcon(x, y, m_hIcon); FZ*"^=)`G
} >d 5-if
else x{H+fq,M
{ ]TvMT
CDialog::OnPaint(); ~WrpJjI[
} [R]V4Hb
} Th_@'UDa
{_7hX`p
HCURSOR CCaptureDlg::OnQueryDragIcon() 2/SUEnaLy_
{ <IrhR,@M,L
return (HCURSOR) m_hIcon; Q%CrB>|@
} `zoHgn7B9q
MN: {,#d0
void CCaptureDlg::OnCancel() a1,)1y~
{ \8(Je"S
if(bTray) {$S"Sj
DeleteIcon(); lDS y$
CDialog::OnCancel(); PqspoH
0OI
} 2)EqqX[D
[I;C6p
void CCaptureDlg::OnAbout() D#nH g
{ +9/K|SB{$
CAboutDlg dlg; `;mgJD
dlg.DoModal(); R3g)LnN
} @tT`s^e
E8C8kH]
void CCaptureDlg::OnBrowse() + 149 o2
{ >p&"X 2
@
CString str; 8kK L=
BROWSEINFO bi; m9h<)D '>
char name[MAX_PATH]; a>C;HO
ZeroMemory(&bi,sizeof(BROWSEINFO)); SY9 5s
bi.hwndOwner=GetSafeHwnd(); [l=@b4Og
bi.pszDisplayName=name; 0 Rb3|te
bi.lpszTitle="Select folder"; u.E>d9
bi.ulFlags=BIF_RETURNONLYFSDIRS; ?C CQm
LPITEMIDLIST idl=SHBrowseForFolder(&bi); X$xf@|<a
if(idl==NULL) "=2\kZ
return; ts=D
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); [XPAI["
str.ReleaseBuffer(); `*[Kmb\
m_Path=str; Mn5(Kw?o2J
if(str.GetAt(str.GetLength()-1)!='\\') ; &rxwL
m_Path+="\\"; +:Xg7H*
UpdateData(FALSE); "IS; o o$g
} HFB>0<$
e!=7VEB
void CCaptureDlg::SaveBmp() aGWO3Nk
{ /#5rt&q
CDC dc; Wrbv<8}%c
dc.CreateDC("DISPLAY",NULL,NULL,NULL); pPxgjX
CBitmap bm; ;\"5)S
int Width=GetSystemMetrics(SM_CXSCREEN); b73}|4v
int Height=GetSystemMetrics(SM_CYSCREEN); ^G qO>1U
bm.CreateCompatibleBitmap(&dc,Width,Height); eG+$~\%Fub
CDC tdc; S#CaJ}M
tdc.CreateCompatibleDC(&dc); =f@71D1
CBitmap*pOld=tdc.SelectObject(&bm); +% <kcc3
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); *s, bz.[
tdc.SelectObject(pOld); .WeSU0XG
BITMAP btm; }2Ge??!
bm.GetBitmap(&btm); 7E*0;sA#
DWORD size=btm.bmWidthBytes*btm.bmHeight; ZT"vVX-)G
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); dm[JDVv|
BITMAPINFOHEADER bih;
Ce//;Op
bih.biBitCount=btm.bmBitsPixel; QP"5A7=m
bih.biClrImportant=0; ^69(V LK
bih.biClrUsed=0; @WXRZEz
bih.biCompression=0; f*V^HfiQb
bih.biHeight=btm.bmHeight; 2./z6jXW_
bih.biPlanes=1; x`2dN/wDhf
bih.biSize=sizeof(BITMAPINFOHEADER); s o: o
b}
bih.biSizeImage=size; ao7M([ff
bih.biWidth=btm.bmWidth; ZCK#=:ln
bih.biXPelsPerMeter=0; ;
p+C0!B2
bih.biYPelsPerMeter=0; C(sz/x?11
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); JFu.o8[Q
static int filecount=0; )#Ecm<.^
CString name; !#1UTa
name.Format("pict%04d.bmp",filecount++); =C#z Px,
name=m_Path+name; * W"Pv,:
BITMAPFILEHEADER bfh; aA%x9\Y
bfh.bfReserved1=bfh.bfReserved2=0; ?y%Mm09
bfh.bfType=((WORD)('M'<< 8)|'B'); 8u*Q^-fpo0
bfh.bfSize=54+size; $Q|6W &?[;
bfh.bfOffBits=54; TJcHqzcUc
CFile bf; }If,O
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ $/u.F;
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); )+)qFGVz
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ~urk
Uz
bf.WriteHuge(lpData,size); ;Srzka2
bf.Close(); e*<pO@Uy
nCount++; YY>&R'3[
} 17:7w
GlobalFreePtr(lpData); ?r$&O*;
if(nCount==1) T_\hhP~
m_Number.Format("%d picture captured.",nCount); =%77~q-HL
else eHHU2^I,
m_Number.Format("%d pictures captured.",nCount); YYe<StyH
UpdateData(FALSE); AgDXpaq
} !~m PxGY
(e
2.Ru
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) rXrIGgeM
{ .dc|?$XV
if(pMsg -> message == WM_KEYDOWN) hZ>1n&[@
{ ju.`c->k"
if(pMsg -> wParam == VK_ESCAPE) x {Rj2~KC
return TRUE; ? _[q{i{
if(pMsg -> wParam == VK_RETURN) H_iQR9Ak7
return TRUE; ?U:c\TA,m
} @q|c|X:I
return CDialog::PreTranslateMessage(pMsg); 3! KyO)8
} p%Ns
f[1>
wLq#,X>%B
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) >'3nsR
{ x` 4|^u
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 4{$ L]toP
SaveBmp(); h-03]M#8=
return FALSE; pfMmDl5|
} N]I::
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Vvn~G.&)
CMenu pop; <P5 7s+JK
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); I0bkc3
CMenu*pMenu=pop.GetSubMenu(0);
" v'%M({
pMenu->SetDefaultItem(ID_EXITICON); Z1\=d =
CPoint pt; <?rdhx
GetCursorPos(&pt); *Xu?(Jd
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); -9 |)O:
if(id==ID_EXITICON) 4?`*#DPl
DeleteIcon(); @Y%i`}T%(
else if(id==ID_EXIT) p13y`sU=
OnCancel(); ^Y"|2 :
return FALSE; oPxh+|0?
} I_`$$-|
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 2N&S__
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) q' t"
AddIcon(); @Bsvk9}
return res; J32"Ytdo<
} RHI?_gf&
y<ZT~e
void CCaptureDlg::AddIcon() 4g+o/+6!4
{ ad<ZdO*h
NOTIFYICONDATA data; <@c9S,@t
data.cbSize=sizeof(NOTIFYICONDATA); Jb!s#g
CString tip; @i>4k
tip.LoadString(IDS_ICONTIP); K pKZiUQm
data.hIcon=GetIcon(0); 1?y
QjW,
data.hWnd=GetSafeHwnd(); AHplvksb
strcpy(data.szTip,tip); e1H2w?
s
data.uCallbackMessage=IDM_SHELL; _dVA^m
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 69Q#UJ
data.uID=98; aslb^
Shell_NotifyIcon(NIM_ADD,&data); ~kZ?e1H
ShowWindow(SW_HIDE); a^)@}4
bTray=TRUE; ZGS4P 0$
} za5E{<0
a;G>56iw
void CCaptureDlg::DeleteIcon() 70A* !v
{ /6'5uP
NOTIFYICONDATA data; )4FW~o<i
data.cbSize=sizeof(NOTIFYICONDATA); _lw:lZM?
data.hWnd=GetSafeHwnd(); wEix 8Ow*
data.uID=98; P7qzZ
Shell_NotifyIcon(NIM_DELETE,&data); XTq+ 9
ShowWindow(SW_SHOW); Yx"~_xA/u
SetForegroundWindow(); J'yiVneMw
ShowWindow(SW_SHOWNORMAL); 4='/]z
bTray=FALSE; <xD6}h/
} j2%M-y4E
rVb61$
void CCaptureDlg::OnChange() BK foeN)%
{ -pN'r/$3V
RegisterHotkey(); CuYSvW
} zRA,Yi4;+
tf{o=X.)
BOOL CCaptureDlg::RegisterHotkey() ;/(<yu48
{ )VkH':yCM
UpdateData(); bx3kd+J7
UCHAR mask=0; o+T, O+i
UCHAR key=0; g-2(W
if(m_bControl) x3=SMN|a
mask|=4; 7HQ|3rt
if(m_bAlt) 10..<v7
mask|=2; R5rCCp
if(m_bShift) l7S&s&W @
mask|=1; +{&++^(}a
key=Key_Table[m_Key.GetCurSel()]; I*=
=I4qx
if(bRegistered){ hODq&9!
DeleteHotkey(GetSafeHwnd(),cKey,cMask); F t;[>o
bRegistered=FALSE; BA`K ,#Ft7
} 2]_fNCNLN
cMask=mask; 6V @ [<d
cKey=key; d6g^>}-!t
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); oedLe9!
return bRegistered; e`t-:~'
} KqWt4{\8v`
w4;1 ('
四、小结 hR~~k~84
-Z&9pI(3R~
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。