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:
>j/w@Fj
Q?vlfZR`8 一、实现方法
vgPCQO([ 6'/ #+,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:
3$ pX \85i+q:LuA #pragma data_seg("shareddata")
)2.Si# HHOOK hHook =NULL; //钩子句柄
nKY6[|!# UINT nHookCount =0; //挂接的程序数目
= [E static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
[~HN<>L@C static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
,prf;|e? static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
Xhm
c6? static int KeyCount =0;
M >u_4AY static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
\dVOwr #pragma data_seg()
CrLrw T HtFDlvdy] 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。
C _Dn{ wT@og|M 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:
$i&zex{\ _b 0&!l<
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
C]6O!Pb0 cKey,UCHAR cMask)
1#x0 q:6 {
(zk"~Ud BOOL bAdded=FALSE;
\hXDO_U for(int index=0;index<MAX_KEY;index++){
lN@o2QX if(hCallWnd[index]==0){
&Jj<h: * hCallWnd[index]=hWnd;
>6T8^Nt HotKey[index]=cKey;
V88p;K$+ HotKeyMask[index]=cMask;
hb$Ce'}N bAdded=TRUE;
jp,4h4C^) KeyCount++;
7! Nsm break;
R&&4y 7 }
V!Uc( }
~$'awY return bAdded;
D7Z /H'| }
s;e\ pt //删除热键
@{Q4^'K" BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
1M 6D3d_ {
<I?Zk80 BOOL bRemoved=FALSE;
]Ze1s02( for(int index=0;index<MAX_KEY;index++){
sRs>"zAg if(hCallWnd[index]==hWnd){
%J(:ADu] if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
e
,(mR+a8 hCallWnd[index]=NULL;
dPlV>IM$z HotKey[index]=0;
@JMiO^ HotKeyMask[index]=0;
3fj4%P" bRemoved=TRUE;
?,mmYW6TjB KeyCount--;
o-5TC break;
b6bHTH0 }
';CNGv - }
K+eM }
4(+PD&_J return bRemoved;
SUiOJ[5, }
D*jM1w_` /uflpV| q9"96({\@ DLL中的钩子函数如下:
teRTu VA%J\T|G2\ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
dO'(2J8 {
D.:Zx BOOL bProcessed=FALSE;
?<!| if(HC_ACTION==nCode)
y29m/i: {
Q &8-\ if((lParam&0xc0000000)==0xc0000000){// 有键松开
w)f#V s switch(wParam)
BmT! aue {
C|bET case VK_MENU:
V~GDPJ+ MaskBits&=~ALTBIT;
YK_7ip.a[ break;
=_CzH(=f# case VK_CONTROL:
dtDFoETz MaskBits&=~CTRLBIT;
)0`C@um break;
\bXa&Lq case VK_SHIFT:
&oNAv-m^GD MaskBits&=~SHIFTBIT;
:OT& break;
97Vtn4N3 default: //judge the key and send message
W/N7vAx X break;
mH(:?_KrS- }
KI.unP% for(int index=0;index<MAX_KEY;index++){
0GL M(JmK if(hCallWnd[index]==NULL)
k$Vl fQ'+ continue;
7V>M] if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
kh<2BOV {
F|8& SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
" bG2: bProcessed=TRUE;
8ag!K*\V< }
WH\d| 1) }
gYj'(jB }
\U0Q<ot/7 else if((lParam&0xc000ffff)==1){ //有键按下
~*7]r`6\@ switch(wParam)
7<4qQ.deE {
st*gs-8jJ; case VK_MENU:
c-w)|-ac. MaskBits|=ALTBIT;
#yen8SskB break;
}H2R3icE case VK_CONTROL:
"@kaHIf[ MaskBits|=CTRLBIT;
KvSG; break;
iU-j"&L5 case VK_SHIFT:
7)m9"InDI MaskBits|=SHIFTBIT;
ICCc./l| break;
~&O%N default: //judge the key and send message
:k"]5>(^ break;
yZ:qU({KhD }
CLSK'+l for(int index=0;index<MAX_KEY;index++){
Ac6=(B if(hCallWnd[index]==NULL)
& kIFcd@ continue;
YIE<pX4Q7) if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
^Cmyx3O^ {
E7hhew SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
$'TM0Yu, bProcessed=TRUE;
llDJ@ }
b6[j%(
}
4Hg9N} }
/?!u{(h } if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
(hsl~Jf for(int index=0;index<MAX_KEY;index++){
^aQ"E9 if(hCallWnd[index]==NULL)
K,]=6Rj continue;
V)^+?B)T if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
g`^x@rj`E SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
l%ZhA=TKQ //lParam的意义可看MSDN中WM_KEYDOWN部分
@o^Ww }
wBzC5T%, }
ToQ"Iy? }
D$N/FJ8|G return CallNextHookEx( hHook, nCode, wParam, lParam );
{*KEP }
|}1dFp E4!Fupkpf 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:
8fb'yjIC 'S~5"6r BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
\9d$@V BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
l~.-e^p? *VeRVaBl 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:
4YHY7J zQA`/&=Y LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
HDKbF/ {
ckn~#UE= if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
-N@|QK> {
eQ"E //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
+RXoi2"-q@ SaveBmp();
{!`4iiF return FALSE;
"j-CZ\]U| }
9kojLqCT …… //其它处理及默认处理
q=G+Tocv }
&{RDM~ zJXplvaL;
!c-*O<Y 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。
R4@6G&2d> &R siVBA 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。
dd["dBIZ ' ^&)|sP 二、编程步骤
Mlq.?-QgIL 9Ee'Cm 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";
HqTjl4ai s7EinI{^ 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
CJ%I51F`X yBRC*0+Vy 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;
rbQR,Nf2x 8] ikygt" 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;
~v83pu1!2s 0Qd:`HF[ 5、 添加代码,编译运行程序。
_rYkis^u Gy)@Is9 三、程序代码
PzGWff!*n >f'g0g ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
`-&K~^-cH #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
" Jr-J#gg #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
^t"'rD-I #if _MSC_VER > 1000
\Roz$t-R|f #pragma once
- YV>j #endif // _MSC_VER > 1000
4 OX^( #ifndef __AFXWIN_H__
wAd9 #error include 'stdafx.h' before including this file for PCH
Ev P{p #endif
j.kG};f #include "resource.h" // main symbols
"vGW2~*) class CHookApp : public CWinApp
qCO/?kW {
4X$Qu6#i public:
05k0n E CHookApp();
sC ;+F*0g // Overrides
03(4 x'z // ClassWizard generated virtual function overrides
+MLVbK //{{AFX_VIRTUAL(CHookApp)
HmwT~ public:
V>
bCKtf& virtual BOOL InitInstance();
7)k\{&+P virtual int ExitInstance();
"nWw;-V}} //}}AFX_VIRTUAL
gO^gxJ'0t //{{AFX_MSG(CHookApp)
]q-Y }1di8 // NOTE - the ClassWizard will add and remove member functions here.
9K&:V(gmw // DO NOT EDIT what you see in these blocks of generated code !
:eg4z ) //}}AFX_MSG
@R
6@]Dm DECLARE_MESSAGE_MAP()
qv"$Bd:]r };
63A.@mL LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
mQ=#nk$~g BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
$\! 7 {6a BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
n}V_,:Z BOOL InitHotkey();
)0R'(# BOOL UnInit();
CA#,THty #endif
F/A|(AH' ow#1="G,= //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
LDg?'y;2 #include "stdafx.h"
(khL-F #include "hook.h"
N"1B/u #include <windowsx.h>
t_suF$ #ifdef _DEBUG
|&[EZ+[ #define new DEBUG_NEW
"}JZU!? #undef THIS_FILE
l$'wD hN* static char THIS_FILE[] = __FILE__;
6(e>P) #endif
2dzrRH #define MAX_KEY 100
/OJ`c`>Q: #define CTRLBIT 0x04
xRsWI!d+| #define ALTBIT 0x02
;Q&5,<
N)j #define SHIFTBIT 0x01
Y5d \d\e/ #pragma data_seg("shareddata")
y|q3Wa HHOOK hHook =NULL;
=kqt UINT nHookCount =0;
gGS=cdlV static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
k: ;WtBC6j static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
evJ.<{M static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
kE(mVyLQ static int KeyCount =0;
O,A{3DAe0 static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
27<
Enq] #pragma data_seg()
/^|Dbx!u HINSTANCE hins;
:#~j:C| void VerifyWindow();
PJ'E/C)i BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
&(mR>
mT //{{AFX_MSG_MAP(CHookApp)
lUiL\~Gq // NOTE - the ClassWizard will add and remove mapping macros here.
1&o|TT/ // DO NOT EDIT what you see in these blocks of generated code!
C\/L v. //}}AFX_MSG_MAP
@Pzu^ END_MESSAGE_MAP()
o7LuKRl
@jlw_ob2g CHookApp::CHookApp()
uL/m u< {
bD8Gwi=iiu // TODO: add construction code here,
M {Q;: // Place all significant initialization in InitInstance
PIpi1v*qz }
}Ys>(w (/*]?Ehd CHookApp theApp;
[\b0Lem LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
?8Cq{ {
*C=>X193U BOOL bProcessed=FALSE;
Gm.]sE?. if(HC_ACTION==nCode)
XNu^`Ha {
78%~N`x7 if((lParam&0xc0000000)==0xc0000000){// Key up
yqiq,=OvP switch(wParam)
Q'mM3pq4r {
v2;`f+ case VK_MENU:
Q( {
r@*g MaskBits&=~ALTBIT;
A7hVHxNJ- break;
p`#R<K case VK_CONTROL:
h.s+)fl\ MaskBits&=~CTRLBIT;
t\j*}# S break;
3K/MvNI> case VK_SHIFT:
B i<Q=x'Z; MaskBits&=~SHIFTBIT;
r s?R:+ break;
\<6CZ default: //judge the key and send message
x*&|0n.D break;
{Wu$YWE*sx }
2oRg 2R} for(int index=0;index<MAX_KEY;index++){
[o5Hl^ if(hCallWnd[index]==NULL)
; XN{x continue;
8d-t|HkN if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
bl(RyAgA {
2q4<t:! SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
zeC
RK+- bProcessed=TRUE;
"E?2xf|. }
tlp@?(u }
@w !PaP }
T+k{W6 else if((lParam&0xc000ffff)==1){ //Key down
} c}_<#I switch(wParam)
EJ:%}HhA {
&wE%<"aRAl case VK_MENU:
zb<6
Ov MaskBits|=ALTBIT;
1.9}_4! break;
- kwXvYu\ case VK_CONTROL:
Zt.|oYH$ MaskBits|=CTRLBIT;
7 uKY24 break;
>!1. case VK_SHIFT:
~-J]W-n MaskBits|=SHIFTBIT;
Q &K break;
.:QLk&a,:, default: //judge the key and send message
Q_X.rUL0w break;
6@0OQb }
Hi1JLW, for(int index=0;index<MAX_KEY;index++)
[>%xd)8.c {
:'l^kSP_*C if(hCallWnd[index]==NULL)
*8_wYYH continue;
zvH8^1yzG if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
| Aw%zw1@ {
}$Tl ?BRpU SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
],a 5)kV bProcessed=TRUE;
~`\?"s: }
c%G{#}^2 }
#(JNn'fzq }
s<eb;Z2D if(!bProcessed){
[t@Mn for(int index=0;index<MAX_KEY;index++){
m(#LhlX if(hCallWnd[index]==NULL)
5Qn
' continue;
f;gw"onx8F if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
?Yk.$90 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
u5: q$P }
$m1z-i;/ }
JYd 'Jp8bP }
>kp?vK;'B return CallNextHookEx( hHook, nCode, wParam, lParam );
i?g5_HI }
"4+WZR] ( _)jkI
\ BOOL InitHotkey()
^o1*a&~J@ {
lXiKY@R# if(hHook!=NULL){
kZZh"#W: L nHookCount++;
E5xzy/ZQ return TRUE;
4^~(Mh- Mw }
ve/<=IR
Zo else
tlqiXh< hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
^,_w$H if(hHook!=NULL)
;y\IqiA{o nHookCount++;
,5,!es@`b return (hHook!=NULL);
S` ;?z }
C=It* j55 BOOL UnInit()
ZUR6n>r {
*HO}~A%Lx if(nHookCount>1){
ruzspS nHookCount--;
o.G!7 return TRUE;
`-l6S }
X{'q24\F BOOL unhooked = UnhookWindowsHookEx(hHook);
(Cd\G=PK if(unhooked==TRUE){
]0)|7TV* nHookCount=0;
t&CJ%XP hHook=NULL;
5Z\#0":e }
%i-c0|,T4 return unhooked;
3`.7<f` }
S=nzw-(I 4V==7p
x( BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
g,95T Bc {
-VTkG]{`Ir BOOL bAdded=FALSE;
tj4VWJK for(int index=0;index<MAX_KEY;index++){
*
%M3PTY\ if(hCallWnd[index]==0){
Nkl_Ho, hCallWnd[index]=hWnd;
%.
,=maA HotKey[index]=cKey;
ez^@NK HotKeyMask[index]=cMask;
5nO% Ke= bAdded=TRUE;
w1#gOwA,$ KeyCount++;
Vq;A>
break;
A"D,Kg
S }
>U*T0FL7 }
wK-3+&,9 return bAdded;
(%xwl }
T {Uc:Z kO{s^_qR^c BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
C
#6dC0 {
,JN8f]a^"g BOOL bRemoved=FALSE;
ICkp$u^ for(int index=0;index<MAX_KEY;index++){
a@* S+3 if(hCallWnd[index]==hWnd){
*nsAgGKKM^ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
<5jzl hCallWnd[index]=NULL;
ANSFdc HotKey[index]=0;
ux3<l +jv^ HotKeyMask[index]=0;
88h3|'* bRemoved=TRUE;
'-b*EZU8t KeyCount--;
GF%314Xu break;
UHxE)]J }
,|plWIl~ }
XWs"jt }
xz{IH,?IG return bRemoved;
(tGY%oT" }
.h5[Q/*h <_Q:'cx' void VerifyWindow()
ql?=(b;D {
Y> Wu for(int i=0;i<MAX_KEY;i++){
yK2^Y]Ku? if(hCallWnd
!=NULL){ IGFR4+
if(!IsWindow(hCallWnd)){ >Ll$p0W
hCallWnd=NULL;
ZRVT2VfN
HotKey=0; JEgx@};O
HotKeyMask=0; cEd+MCN
KeyCount--; ~JDnKo
} QZhjb
} Bv.`R0e&
} H0R&2#YD
} +_xOLiu
X2i}vjkY
BOOL CHookApp::InitInstance() zyg
}F
{ \Z/)Y;|mi0
AFX_MANAGE_STATE(AfxGetStaticModuleState()); _#}n~}d
hins=AfxGetInstanceHandle(); lF?tQB/a
InitHotkey(); j"@93D~
return CWinApp::InitInstance(); b-*3 2Y%
} CZt \JW+"
m7GR[MR
int CHookApp::ExitInstance() n?urE-_
{ xvSuPP4 m
VerifyWindow(); { F}; n?'
UnInit(); ^~HQC*
return CWinApp::ExitInstance(); \7
NpT}dj
} [wB9s{CX
gxMfu?zk"
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file =.`qixN
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) -tI'3oT1
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ;kJA'|GX
#if _MSC_VER > 1000 $<|lE/_]
#pragma once D^;*U[F?
#endif // _MSC_VER > 1000 1G'`2ATF*
mTEx,
class CCaptureDlg : public CDialog d 'Axum@
{ !GQ\"Ufs>
// Construction @(i!YL
public: @hImk`&[N
BOOL bTray; R?EASc!b
BOOL bRegistered; ii0Ce}8d~
BOOL RegisterHotkey(); )
(Tom9^
UCHAR cKey; VCcr3Dx()F
UCHAR cMask; ?}Lg)EFH
void DeleteIcon(); KB!|B.ChN(
void AddIcon(); ]}6w#)]"
UINT nCount; )CS.F=
void SaveBmp(); ?`Y\)'}
CCaptureDlg(CWnd* pParent = NULL); // standard constructor ,*@AX>
// Dialog Data =60~UM
//{{AFX_DATA(CCaptureDlg) P0-Fc@&Y
enum { IDD = IDD_CAPTURE_DIALOG }; ?<yM7O,4
CComboBox m_Key; rqlc2m,<-p
BOOL m_bControl; @i3bgx>_o
BOOL m_bAlt; "uPy,<l
BOOL m_bShift; M#@aB"@J>
CString m_Path; M-uMZQe
CString m_Number; DBs*Fx[
//}}AFX_DATA oiX"Lz{
// ClassWizard generated virtual function overrides P~FUS%39"o
//{{AFX_VIRTUAL(CCaptureDlg) 7.+#zyF
public: =)OC|?9C\
virtual BOOL PreTranslateMessage(MSG* pMsg); Fequm+
protected: ;*[9Q'lI*
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support TjBY
4
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ~/tKMS6T
//}}AFX_VIRTUAL l~Lb!; ,dN
// Implementation rB%$;<`/
protected: W];EKj,3W
HICON m_hIcon; t=#Pya
// Generated message map functions r
CRgzC
//{{AFX_MSG(CCaptureDlg) O8N[Jl
virtual BOOL OnInitDialog(); :Ld!mRZF
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); cxYfZ4++m
afx_msg void OnPaint(); J:F^
#gW
afx_msg HCURSOR OnQueryDragIcon(); U~2`P
virtual void OnCancel(); k,Zm GllQ]
afx_msg void OnAbout(); `4CWE_k
afx_msg void OnBrowse(); n|4;Hn1V
afx_msg void OnChange(); ; W7Y2Md
//}}AFX_MSG wp.TfKxw
DECLARE_MESSAGE_MAP() zG
c[Z3N
}; >LF&EM]
#endif 7=*VpX1
]wuy_+$
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ;S/7 h6
#include "stdafx.h" i3
)xX@3
#include "Capture.h" (w2=
2$
#include "CaptureDlg.h" 9|S` ub'
#include <windowsx.h> YJ2ro-X
#pragma comment(lib,"hook.lib") } IlP:
#ifdef _DEBUG Pcu|k/tk
#define new DEBUG_NEW |[cdri^?D
#undef THIS_FILE 3LlU]
static char THIS_FILE[] = __FILE__; fV ZW[9[
#endif ?Cci:Lin
#define IDM_SHELL WM_USER+1 c/u_KJFF-n
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); p#_[
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); V_L[P9
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; uf@U:V
class CAboutDlg : public CDialog xKJ>gr"w#
{ IvW@o1Q
public: %3a|<6
CAboutDlg(); Y~"9L|`f/
// Dialog Data GH3#E*t+[
//{{AFX_DATA(CAboutDlg) ZxS&4>.
enum { IDD = IDD_ABOUTBOX }; H|+tC=]4IZ
//}}AFX_DATA a%~yol0wO7
// ClassWizard generated virtual function overrides t^@T`2jL
//{{AFX_VIRTUAL(CAboutDlg) 6d{j0?mM
protected: GFR!n1Hv
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support b4~H3|
//}}AFX_VIRTUAL \mXqak,y
// Implementation U4wpjHg
protected: vO$ra5Z
//{{AFX_MSG(CAboutDlg) 0MpS4tW0=
//}}AFX_MSG w4:<fnOM
DECLARE_MESSAGE_MAP() 0:dB
9
}; Tj,2r]g`<
+?e}<#vd'?
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) YhgUCF#
{ v"k4ATWP
//{{AFX_DATA_INIT(CAboutDlg) Mj~${vj
//}}AFX_DATA_INIT w<d*#$[,*
} O:u%7V/
Wg1tip8s
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 31 ]7z
{ D_aR\
CDialog::DoDataExchange(pDX); !P" ?
//{{AFX_DATA_MAP(CAboutDlg) xzK>Xi?
//}}AFX_DATA_MAP A1<k1[5fJ
} nO@+s
F
<R~KM=rL
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 3LrsWAz'
//{{AFX_MSG_MAP(CAboutDlg) h>tsis'N9
// No message handlers &PWf:y{R`
//}}AFX_MSG_MAP EVSK8T,
END_MESSAGE_MAP() >q &L/N5
#KJZR{
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) J3\)Jy
: CDialog(CCaptureDlg::IDD, pParent) 4sd-zl$Of
{ i;HH !
TaN
//{{AFX_DATA_INIT(CCaptureDlg) <`mOU}0)
m_bControl = FALSE; 8OBF^r44R
m_bAlt = FALSE; *dVD
m_bShift = FALSE; !47A$sQ
m_Path = _T("c:\\"); ;@'0T4Z&l
m_Number = _T("0 picture captured."); Fc{((x s
nCount=0; ={xqNRVd
bRegistered=FALSE; ./)j5M
bTray=FALSE; Hf.xd.Yw
//}}AFX_DATA_INIT T Xl\hL\+
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 &"O_wd[+:
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); n%U9iwJ.
} !pV<n
vK`S!7x'&
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) {"\q(R0
{ &}|0CR.(
CDialog::DoDataExchange(pDX); (>r|j4$
//{{AFX_DATA_MAP(CCaptureDlg) UR\ZN@O
DDX_Control(pDX, IDC_KEY, m_Key); t*rp3BIG
DDX_Check(pDX, IDC_CONTROL, m_bControl); z.A4x#>-
DDX_Check(pDX, IDC_ALT, m_bAlt); Lo5Jb6nm
DDX_Check(pDX, IDC_SHIFT, m_bShift); l^BEFk;
DDX_Text(pDX, IDC_PATH, m_Path); 7ozYq_ $
DDX_Text(pDX, IDC_NUMBER, m_Number); C*]AL/
//}}AFX_DATA_MAP %y3:SUOdx
} ;_wMWl0F
Cea"qNq=k
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) NB3/A"}"02
//{{AFX_MSG_MAP(CCaptureDlg) TVj1C
ON_WM_SYSCOMMAND() #VQ36pCd
ON_WM_PAINT() R$v i!0
ON_WM_QUERYDRAGICON() r8<JX5zyuo
ON_BN_CLICKED(ID_ABOUT, OnAbout)
Ckw83X
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) (J/>Gy)d
ON_BN_CLICKED(ID_CHANGE, OnChange) U=M#41J
//}}AFX_MSG_MAP 4'_L W?DS
END_MESSAGE_MAP() Za34/ro/T
S q.9-h%5
BOOL CCaptureDlg::OnInitDialog() ?!_u,sT
{ yi&?d&rK
CDialog::OnInitDialog(); Lq3(Z%
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 5~*=#v:`
ASSERT(IDM_ABOUTBOX < 0xF000); G|<] Ma9x
CMenu* pSysMenu = GetSystemMenu(FALSE); ?UU5hek+m
if (pSysMenu != NULL) ,7QBJ_-;QJ
{ fHW-Je7mG
CString strAboutMenu; S_`W@cp[
strAboutMenu.LoadString(IDS_ABOUTBOX); S|s3}]g9
if (!strAboutMenu.IsEmpty()) @ 8A{ 9i
{ <r@bNx@T
pSysMenu->AppendMenu(MF_SEPARATOR); u2f `|+1^y
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); cvn-*Sj
} Cq
TH!'N
} yIM.j;5:~5
SetIcon(m_hIcon, TRUE); // Set big icon #!(Zn:[
SetIcon(m_hIcon, FALSE); // Set small icon Qu!OV]Cc
m_Key.SetCurSel(0); R
%Rv
RegisterHotkey(); iJ5e1R8tN
CMenu* pMenu=GetSystemMenu(FALSE); U$MWsDn
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); YmdsI+DbIu
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); wEZqkV
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Rv0-vH.n
return TRUE; // return TRUE unless you set the focus to a control oB hL}r
} Oz_b3r
=]8f"wAh*
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ajf_)G5X P
{ K'>P!R:El
if ((nID & 0xFFF0) == IDM_ABOUTBOX) H0 {Mlu9
{ |p'_k(z}
CAboutDlg dlgAbout; `[w}hFl~q
dlgAbout.DoModal(); 0V{>)w!Fo
} qb#V)
else { mK pD
{ :YkDn~@
CDialog::OnSysCommand(nID, lParam); /&y,vkZTT
} 5%vP~vy_}
} O~7p^i}
!pE>O-| K
void CCaptureDlg::OnPaint() }W^V^i )
{ tyBg7dP
if (IsIconic()) Lh8#I&x
{ e7)> U!9c9
CPaintDC dc(this); // device context for painting C.DoXE7
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 1q;I7_{ 2
// Center icon in client rectangle W$x K^}
int cxIcon = GetSystemMetrics(SM_CXICON); krnvFZRTQ
int cyIcon = GetSystemMetrics(SM_CYICON); $Qx(aWE0
CRect rect; BV_a-\Sa=
GetClientRect(&rect); B8P@D"u
int x = (rect.Width() - cxIcon + 1) / 2; 7`j|tb-
int y = (rect.Height() - cyIcon + 1) / 2; _rWTw+
L
// Draw the icon T%z!+/=&^
dc.DrawIcon(x, y, m_hIcon); |\yDgs%EGy
} oW\Q>c7
=
else EX[l0]fj
{ '6Rs0__
CDialog::OnPaint(); ]G$!/vXP
} "N=&4<]I5
} -NI@xJO4(;
P17]}F``
HCURSOR CCaptureDlg::OnQueryDragIcon() {d{WMq$
{ 06j)P6Iju
return (HCURSOR) m_hIcon; r&LCoe'\{i
} qrORP3D@
w|3fioLs
void CCaptureDlg::OnCancel() Hf`&&
{ {/,+_E/
if(bTray) ]J0Y^dM
DeleteIcon(); &El[
CDialog::OnCancel(); *1;L,*J"|
} 0(.R?1*:Rf
(\AszLW
void CCaptureDlg::OnAbout() {BwN4r46
{ oGU.U9~!
CAboutDlg dlg; !*$'fn'bAA
dlg.DoModal(); LXOF{FG
} Jg?pW:}R
s^x ,S
void CCaptureDlg::OnBrowse() $4fjSSB~
{ &nY2u-Q
CString str; 4'u|L&ow
BROWSEINFO bi; 'TEwU0<%
char name[MAX_PATH]; kdZ-<O7@
ZeroMemory(&bi,sizeof(BROWSEINFO)); \ &|w;
bi.hwndOwner=GetSafeHwnd(); %.r5E2'
bi.pszDisplayName=name; *?
orK o
bi.lpszTitle="Select folder"; !IrKou)/_
bi.ulFlags=BIF_RETURNONLYFSDIRS; d#$i/&gE
LPITEMIDLIST idl=SHBrowseForFolder(&bi); /ux#U]x
if(idl==NULL) 8Gzs
return; 'e8d["N
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); >G -?e!
str.ReleaseBuffer(); ~wQ WWRk
m_Path=str; Q-3J0=
if(str.GetAt(str.GetLength()-1)!='\\') hJL0M!
m_Path+="\\"; p>hCh5
UpdateData(FALSE); -_H2FlB
} .<|4PG
-2mOgv
void CCaptureDlg::SaveBmp() $DMu~wwfG
{ P^W$qy|
CDC dc; P#'DG W&W0
dc.CreateDC("DISPLAY",NULL,NULL,NULL); s(DaPhL6Qm
CBitmap bm; )SZ,J-H08w
int Width=GetSystemMetrics(SM_CXSCREEN); _}%#Yz
int Height=GetSystemMetrics(SM_CYSCREEN); Tx&qp#FS
bm.CreateCompatibleBitmap(&dc,Width,Height); OEq e^``!
CDC tdc; (/UMi,Ho
tdc.CreateCompatibleDC(&dc); ?.'oxW
CBitmap*pOld=tdc.SelectObject(&bm); MyS7AL
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); FWx*&y~$
tdc.SelectObject(pOld); ~+NFWNgN
BITMAP btm; ^i,0n}>
bm.GetBitmap(&btm); jMN@x]6w
DWORD size=btm.bmWidthBytes*btm.bmHeight; j~<iTLM
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); iPi'5g(a
BITMAPINFOHEADER bih; zAdVJ58H
bih.biBitCount=btm.bmBitsPixel; */m~m?
bih.biClrImportant=0; InGbV+ I
bih.biClrUsed=0; T<~[vjA
bih.biCompression=0; 5~TA(cb5
bih.biHeight=btm.bmHeight; 4OgGZ
bih.biPlanes=1; YSUH*i/%
bih.biSize=sizeof(BITMAPINFOHEADER); UyfIAC$S
bih.biSizeImage=size; 1$!K2=%OXj
bih.biWidth=btm.bmWidth; %b'VEd7
bih.biXPelsPerMeter=0; v-]-wNqT
bih.biYPelsPerMeter=0; q|_ 5@Ly
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Ud?d.
static int filecount=0; i!-sbwd7
CString name; rMFf8D(Y
name.Format("pict%04d.bmp",filecount++); 9w<_XXQ
name=m_Path+name; [~%;E[ky$
BITMAPFILEHEADER bfh; *j; r|P;g
bfh.bfReserved1=bfh.bfReserved2=0; * =N6_
bfh.bfType=((WORD)('M'<< 8)|'B'); 7)X&fV6<8
bfh.bfSize=54+size; xa axj
bfh.bfOffBits=54; !6`nN1A
CFile bf; o sH,(\4_
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ +4vX+;: br
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); OehB"[;+
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ^bw~$*"j#
bf.WriteHuge(lpData,size); ATkqzE`;
bf.Close(); yxq!.72
nCount++; /9^0YC;Y*
} DY27' `n6
GlobalFreePtr(lpData); qMj
e,Y
if(nCount==1) U.9nHo{
m_Number.Format("%d picture captured.",nCount); 9 W
r(w
else yodrX&"
m_Number.Format("%d pictures captured.",nCount); T1TZ+\
UpdateData(FALSE); r_CN/ a
} 3W
WxpTU
g5'bUYsa
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) jWCC`0
T
{ x1ex}_\
if(pMsg -> message == WM_KEYDOWN) im\Ws./
{ ^^(ZK 6 d
if(pMsg -> wParam == VK_ESCAPE) r>eXw5Pr7
return TRUE; 7!r`DZ"yF
if(pMsg -> wParam == VK_RETURN) AFA*_9Ut
return TRUE; r+yLK(<zp
} YZJP7nN
return CDialog::PreTranslateMessage(pMsg); 4r!40^:2
} |"*:ZSj
%'<
qhGJ
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) xef7mx
{ ?*dx=UI
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ :
s3Vl
SaveBmp(); &^>r<~]
return FALSE; >QPS0Vx[
} gQGiph |
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ /!3:K<6@
CMenu pop; c9={~
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 4x>e7Kf
CMenu*pMenu=pop.GetSubMenu(0); .U
{JI\
pMenu->SetDefaultItem(ID_EXITICON); 40ZB;j$l
CPoint pt; GDntGTE~sk
GetCursorPos(&pt); k}gs;|_
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ?2Dz1#%D
if(id==ID_EXITICON) s2kynQ#a
DeleteIcon(); v#G ^W
else if(id==ID_EXIT) u'][3
OnCancel(); Qgi:q
return FALSE; >iV(8EgBS
} iDN,}:<V
LRESULT res= CDialog::WindowProc(message, wParam, lParam); lvffQ_t
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) mK4A/bsE
AddIcon(); 7Kjq1zl;
return res; K.I r+SB
} bp_@e0
sP!qv"u
void CCaptureDlg::AddIcon() g?sFmD
{ i{0_}"B
NOTIFYICONDATA data; $T0[
data.cbSize=sizeof(NOTIFYICONDATA); vA `.8U 0S
CString tip; N<WFe5
tip.LoadString(IDS_ICONTIP); >i<-rO>kN
data.hIcon=GetIcon(0); QJ?!_2Ax
data.hWnd=GetSafeHwnd(); #U6qM(J
strcpy(data.szTip,tip); 3dLz=.=)'
data.uCallbackMessage=IDM_SHELL; }% *g\%L
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; %cL:*D4oz
data.uID=98; 03T.Owd
Shell_NotifyIcon(NIM_ADD,&data);
`Ea3z~<7M
ShowWindow(SW_HIDE); l|{<!7a
bTray=TRUE; b iD7(AK
} &$f?XdZ7
V}?5=f'
void CCaptureDlg::DeleteIcon() 8!fwXm
{ g(^l>niF:
NOTIFYICONDATA data; c#Bde-dh
data.cbSize=sizeof(NOTIFYICONDATA); 5[k35c{
data.hWnd=GetSafeHwnd(); $G[##j2
data.uID=98; -M}iDBJx>#
Shell_NotifyIcon(NIM_DELETE,&data); W#Z]mt B
ShowWindow(SW_SHOW); I(SE)%!%S
SetForegroundWindow(); oxZ(qfjS
ShowWindow(SW_SHOWNORMAL); WP9=@X Z
bTray=FALSE; th{h)( +H
} ^8)d8?}
@U5o;X!qU
void CCaptureDlg::OnChange() Qd&j~cG@
{ $}@ll^
RegisterHotkey(); %qMk&1
} =*I9qjla[?
tti.-
BOOL CCaptureDlg::RegisterHotkey() AyDK-8a
{ #XZ?,neY
UpdateData(); v*pVcBY>
UCHAR mask=0; aryr
UCHAR key=0; AyUVsIuPT=
if(m_bControl) ;A_QI>>
mask|=4; p5\b&~
g
if(m_bAlt) LCtm@oN
mask|=2; ?a%
u=G
if(m_bShift) ]So%/rOvX
mask|=1; U\N`[k.F
key=Key_Table[m_Key.GetCurSel()]; P<1zXs.H
if(bRegistered){ n"JrjvS
DeleteHotkey(GetSafeHwnd(),cKey,cMask); {sLh=iK
bRegistered=FALSE; sx;1V{|g
} %PpB$
cMask=mask; PuWF:'w r
cKey=key; YL]x>7T~4t
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); yI!K
quMC
return bRegistered; z|Xl%8
} (+@H !>r$$
YeQX13C"Z
四、小结 ]Q+Tm2{
ty ~U~
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。