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:
0+r/>-3]
Z/;rM8[{& 一、实现方法
zK:/
1 K
N0S$nW+ 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
;=)CjC8) xvp{F9~qT #pragma data_seg("shareddata")
# JuO HHOOK hHook =NULL; //钩子句柄
uVu`TgbZ UINT nHookCount =0; //挂接的程序数目
]pb;q(?^ static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
[rPW@|^5 static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
<`|}bt static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
K~,,xsy,G& static int KeyCount =0;
o?p) V^7 static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
}tv- #pragma data_seg()
`p#A2ApA *TE6p 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
7GK| A{r qg.[M* DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
! h&hPY1 _vU,avw BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
,=o q)Fm] cKey,UCHAR cMask)
.# j)YG {
5/P?@`/eT BOOL bAdded=FALSE;
S*#y7YKI for(int index=0;index<MAX_KEY;index++){
30<dEoF if(hCallWnd[index]==0){
"-<u.$fE hCallWnd[index]=hWnd;
o{UwUMw5` HotKey[index]=cKey;
3O#7OL68v HotKeyMask[index]=cMask;
4sZ^:h,1 bAdded=TRUE;
>454Yir0Mk KeyCount++;
T| 4c\ break;
KDQux }
<hy>NM@$ }
s|,gn 5 return bAdded;
x:l`e:`y9 }
4eaC18? //删除热键
>t*zY~R. BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
7qW:^2y {
Ubn5tN
MK BOOL bRemoved=FALSE;
i7fpl for(int index=0;index<MAX_KEY;index++){
b> 2u>4 if(hCallWnd[index]==hWnd){
>r]# 77d if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
Mh_jlgE'd# hCallWnd[index]=NULL;
yuI5#
VUS HotKey[index]=0;
E/s3@-/ HotKeyMask[index]=0;
)[nzmL*w bRemoved=TRUE;
t'9E~_!C KeyCount--;
IyP\7WZ break;
gscsB4< }
ZklidHL'); }
wau81rSd }
79x^zqLb return bRemoved;
*^.b}K% }
4vBbP;ELWq
mH8s'F `fc*/D DLL中的钩子函数如下:
&Puu Xz< 2EK\QW o LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
^x/0*t5};z {
8~2A"<{ub BOOL bProcessed=FALSE;
}JlQQ if(HC_ACTION==nCode)
z>y,}#D?C {
9w0 ^= if((lParam&0xc0000000)==0xc0000000){// 有键松开
n:<avl@o< switch(wParam)
{v`wQM[ {
dr/!wr'&hS case VK_MENU:
{5%<@<?) MaskBits&=~ALTBIT;
X^xu$d6 break;
4El{2cfA case VK_CONTROL:
cJ[n<hTv MaskBits&=~CTRLBIT;
)Fm break;
`kj7I{'l%9 case VK_SHIFT:
Yhlk#>I MaskBits&=~SHIFTBIT;
Rf%ver break;
B:x4H}`vh default: //judge the key and send message
7Q[P break;
WMUw5h }
]e"NJkcm for(int index=0;index<MAX_KEY;index++){
9MXauTKI if(hCallWnd[index]==NULL)
C)ChF`Ru': continue;
w[|!$J? if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
1m![;Pg3 {
'GW@P SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
#x%O0 bProcessed=TRUE;
{UPIdQ'g }
5 !NPqka}. }
^NnZYr. }
~RMOEH.o else if((lParam&0xc000ffff)==1){ //有键按下
Gu_s:cgB9F switch(wParam)
Y":hb;& {
A6UtpyS*' case VK_MENU:
)?TJ{'m MaskBits|=ALTBIT;
7NXT.E~2 break;
!8A5Y[(XD case VK_CONTROL:
H"&N<"hw MaskBits|=CTRLBIT;
&=7ur break;
~O^_J) case VK_SHIFT:
m=}kGzIY4 MaskBits|=SHIFTBIT;
@wa/p`gj5w break;
km|~DkJ\a` default: //judge the key and send message
(wA|lK3 break;
z+\>e~U6J} }
wvh4AE5F|z for(int index=0;index<MAX_KEY;index++){
&<> A if(hCallWnd[index]==NULL)
^~Ar continue;
Y*AHwc<w` if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
z1Ju;k(8 {
C]):+F<7 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
' Uc|[l]
bProcessed=TRUE;
8?)Da&+f }
f,uxoAS }
9g*~X;`2 }
<A6<q&g|E if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
"3>#[o for(int index=0;index<MAX_KEY;index++){
5VPuHY2 if(hCallWnd[index]==NULL)
6>vj({,1Y* continue;
j<gnh if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
}3i@5ctQ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
:#|77b0 //lParam的意义可看MSDN中WM_KEYDOWN部分
*yX_dgC>[ }
?=T&|pp }
j1d=$'a " }
$qEJO=v return CallNextHookEx( hHook, nCode, wParam, lParam );
-51L!x}1c }
iFDQnt
[t +ypT"y 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
~O|0.)71] gT+/CVj R BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
X F40;urm BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
`kz_q/K !nYAyjf 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
:c.i Z k&?QeXW LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
=AAH} {
nv8,O=#s if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
+,KuYa{lu {
0loC^\f //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
\m\.+q] SaveBmp();
?IWLl return FALSE;
L NE]#8ue }
3)eeUO+ …… //其它处理及默认处理
6Q>w\@lF }
Nyo6R9^ vLC&C-f >\i{,F=U7 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
0-#ct1- {C6Yr9 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
[AGm%o=) REsThB 二、编程步骤
ofi']J{R g 08
`=g 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
p75w^ b"Ulc}$/& 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
Q{a!D0;4v 3 (<!pA 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;
lWdE^- k+i=0P0mf 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;
-`gC?yff:
KA< 5、 添加代码,编译运行程序。
fU8;CZnx m|y]j4 三、程序代码
pp-Ur?PM [Q*kom : ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
Gah e-%J #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
Kfr?sX #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
N" 8o0> #if _MSC_VER > 1000
q\/|nZO4 #pragma once
9QYU
J #endif // _MSC_VER > 1000
4 I~,B[| #ifndef __AFXWIN_H__
f9rToH #error include 'stdafx.h' before including this file for PCH
ywdNwNJ #endif
\\T
I4A^# #include "resource.h" // main symbols
p
2i5/Ly class CHookApp : public CWinApp
b9v Kux {
(= \P|iv public:
C6Mb(& CHookApp();
mPu5%% // Overrides
{jl4` // ClassWizard generated virtual function overrides
^aC[ZP: //{{AFX_VIRTUAL(CHookApp)
fvx0]of public:
k~gQn:.Cx virtual BOOL InitInstance();
b6i0_fOO virtual int ExitInstance();
E=B9FIx~< //}}AFX_VIRTUAL
N7;2BUIXJ //{{AFX_MSG(CHookApp)
M-Js"cB[ // NOTE - the ClassWizard will add and remove member functions here.
Pf!K()<uJ // DO NOT EDIT what you see in these blocks of generated code !
w9oiu$7), //}}AFX_MSG
gsR"d@! DECLARE_MESSAGE_MAP()
vS0P]AUo };
>i.+v[)# LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
8R
z=)J BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
#eaey+~ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
f(C0&"4e BOOL InitHotkey();
3646.i[D BOOL UnInit();
Y'Af I^K #endif
" c]Mz&z Vr^wesT\Hx //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
N8vWwN[3 #include "stdafx.h"
9UwDa`^ #include "hook.h"
\i&yR]LF #include <windowsx.h>
yJrPb" #ifdef _DEBUG
EbW7Av #define new DEBUG_NEW
j`
x9z_ #undef THIS_FILE
}Bb(wP^B. static char THIS_FILE[] = __FILE__;
g7H;d #endif
#Q{6/{bM&J #define MAX_KEY 100
1idEm*3&( #define CTRLBIT 0x04
:{fsfZXXr #define ALTBIT 0x02
S*]IR"YL #define SHIFTBIT 0x01
<O*q;&9 #pragma data_seg("shareddata")
!1l2KW<be HHOOK hHook =NULL;
'Hg(N?1" UINT nHookCount =0;
}l/md/C0 static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
KW09qar static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
_3E7|drIX static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
$""[(
d?0 static int KeyCount =0;
7!%cKZCY static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
YF"D;. #pragma data_seg()
*<UQ/)\ HINSTANCE hins;
A ssf
f; void VerifyWindow();
h{! @^Q BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
"&r1&StO //{{AFX_MSG_MAP(CHookApp)
5P! ZJ3C // NOTE - the ClassWizard will add and remove mapping macros here.
m}XI?[!s // DO NOT EDIT what you see in these blocks of generated code!
"[8](3\v //}}AFX_MSG_MAP
$nVTN.k END_MESSAGE_MAP()
V^0*S=N ^qDkSoqC" CHookApp::CHookApp()
55;xAsG {
_zOzHc? Q // TODO: add construction code here,
dv,8iOL // Place all significant initialization in InitInstance
IlE!
zRA }
p7k0pSt $0 li"+ CHookApp theApp;
[qy@g5` LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
4@bL` L) {
p5bH-km6 BOOL bProcessed=FALSE;
YF;8il{p if(HC_ACTION==nCode)
&
=frt3 {
}ri"u;.R if((lParam&0xc0000000)==0xc0000000){// Key up
9xSAWKr,l switch(wParam)
5~sJ$5<, {
'UB<;6wy case VK_MENU:
mr/^lnO MaskBits&=~ALTBIT;
1xx-}AIH# break;
T.{I~_ case VK_CONTROL:
fer'2(G?W MaskBits&=~CTRLBIT;
]y(#]Tw\ break;
X{ Nif G case VK_SHIFT:
"NJ!A MaskBits&=~SHIFTBIT;
L*5&hPU break;
Og,,s{\ default: //judge the key and send message
MLR3A
s break;
^C'k.pV
n~ }
4Q]+tXes for(int index=0;index<MAX_KEY;index++){
$<yb~z7J if(hCallWnd[index]==NULL)
auO^v;s continue;
G,XFS8{% if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
1
t#Tp$ {
k_^d7yH SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
MTF:mLJ bProcessed=TRUE;
2x{3' ^+l }
|mKd5[$ }
9]S}m[8k }
;~@2YPj else if((lParam&0xc000ffff)==1){ //Key down
P8TiB switch(wParam)
Qn<<&i~ {
0h; -Yg case VK_MENU:
Ii"cDH9 MaskBits|=ALTBIT;
F"bbU/5 break;
./6L&?*`~; case VK_CONTROL:
aMHIOA%Kh MaskBits|=CTRLBIT;
W0?yPP=. break;
J%}}(G~ case VK_SHIFT:
{o]OxqE@ MaskBits|=SHIFTBIT;
H8\N~> break;
51rM6
BT default: //judge the key and send message
B0YY7od break;
v&?Bqj }
JL*-L*|Zcl for(int index=0;index<MAX_KEY;index++)
}q~A( u {
Z|j8:Ohz if(hCallWnd[index]==NULL)
\V&ly/\
) continue;
7{b|+0W if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
:Z/ig% {
pY:xxnE SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
Kj-`ru bProcessed=TRUE;
MjLyB^M }
?!
kup }
pZWp2hj{X }
.AV--oA~ if(!bProcessed){
Tn-H8;Hg for(int index=0;index<MAX_KEY;index++){
XL"e<P;t if(hCallWnd[index]==NULL)
}we"IqLb continue;
Nl(Aa5:! if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
V^f'4*~' SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
4BCZ~_ }
,2]6cP(6qQ }
M"P$hb'F }
`HHbQXB return CallNextHookEx( hHook, nCode, wParam, lParam );
fygy#&}~ }
- BocWq\ %i^%D BOOL InitHotkey()
htkyywv {
7u!p.kN if(hHook!=NULL){
t%=ylEPW nHookCount++;
*rqih_j0 return TRUE;
)\s:.<?EQ }
9t)t-t#P; else
@4&sL] (q hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
.Oim7JQ8 if(hHook!=NULL)
sGzd c nHookCount++;
K{0mb return (hHook!=NULL);
))+R*k% }
inhb> zB BOOL UnInit()
TX 12$p\ {
n ,H;PB if(nHookCount>1){
)"q2DjfX* nHookCount--;
:1AOund return TRUE;
v[~ U*#i }
wlkS+$< BOOL unhooked = UnhookWindowsHookEx(hHook);
m2 OP=z@) if(unhooked==TRUE){
Ot/Y?=j~ nHookCount=0;
7$w:~VZ hHook=NULL;
<;acWT?( }
2Gx&ECa, return unhooked;
WLizgVM }
4S9AXE6 `
a@NYi6 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
6v.*%E*P {
{9)LHX7dN BOOL bAdded=FALSE;
B\4SB for(int index=0;index<MAX_KEY;index++){
@jjp\ ~ if(hCallWnd[index]==0){
wCkkfTO hCallWnd[index]=hWnd;
&yYK%~}t[ HotKey[index]=cKey;
id*UTY
Tg HotKeyMask[index]=cMask;
S__ o#nf`% bAdded=TRUE;
'av
OQj]`K KeyCount++;
";xG[ne$Be break;
!WrUr]0IP }
) I@gy }
AU)Qk$c return bAdded;
&;,w}) }
O/Da8#S< <iL+/^# BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
gBrIqM i5 {
ZL-@2ZU{1 BOOL bRemoved=FALSE;
dp+wwNe for(int index=0;index<MAX_KEY;index++){
rj,Sk~0Q if(hCallWnd[index]==hWnd){
D3MuP
p-v if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
ww[STg hCallWnd[index]=NULL;
~C[R%%Gu HotKey[index]=0;
qA*QFQ'- HotKeyMask[index]=0;
uD<*g(R bRemoved=TRUE;
%1e`R*I KeyCount--;
k :af break;
F!.@1Fi1 }
om@` NW }
-V<i4X<|,+ }
A87Tyk2Pi return bRemoved;
20hE)!A }
"WK.sBFz4 }/M ~ void VerifyWindow()
7 +? {
A*@!tz< for(int i=0;i<MAX_KEY;i++){
l=kgRh if(hCallWnd
!=NULL){ Dx iCq(;
if(!IsWindow(hCallWnd)){ 0PTB3-
hCallWnd=NULL; *USZ2|i
HotKey=0; BEu9gu
HotKeyMask=0; '"=C^f
KeyCount--; =TyN"0@
} *}yW8i}36
} 2W|j
K
} %B#Ewt@[
} L(}T-.,Slr
$(C71M|CT
BOOL CHookApp::InitInstance() :#b[gWl0Ru
{ utRvE(IbmV
AFX_MANAGE_STATE(AfxGetStaticModuleState()); p2tBF98
hins=AfxGetInstanceHandle(); c~dX8+
InitHotkey(); ptrLnJ|%
return CWinApp::InitInstance(); <y~`J`-
} Lt=#tu&d
Cm>8r5LG
int CHookApp::ExitInstance() U<o,`y[Tn
{ tpA7"JD
VerifyWindow(); u5%.T0
P
UnInit(); Jw9|I)H
return CWinApp::ExitInstance(); 1jQz%^~
} X%39cXM C
Hn:%(Rg=aW
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ]xV7)/b5G
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ,7tN&R_
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ RYmk6w!w
#if _MSC_VER > 1000 1G$kO90
#pragma once B*,9{ g0m/
#endif // _MSC_VER > 1000 /ptIxe
i7*4hYY
class CCaptureDlg : public CDialog m<r.sq&;
{ IOt!A
// Construction jr'O4bo%
public: ^d-`?zb
BOOL bTray; >.~^(
BOOL bRegistered; 7?B]X%
BOOL RegisterHotkey(); BxlpI[yWq
UCHAR cKey; fv#e 8y
UCHAR cMask; c5^i5de
void DeleteIcon(); 4B!]%Mw;c
void AddIcon();
03_tt7
UINT nCount; Rl<~:,D
void SaveBmp(); ~(G]-__B<
CCaptureDlg(CWnd* pParent = NULL); // standard constructor #^#N%_8
// Dialog Data eEupqOF*:W
//{{AFX_DATA(CCaptureDlg) R6CxNPRJ
enum { IDD = IDD_CAPTURE_DIALOG }; JF!!)6!2#
CComboBox m_Key; 8tLkJOu
BOOL m_bControl; Y~bp:FkS
BOOL m_bAlt; ;nSaZ$`5
BOOL m_bShift; T3!l{vG
\O
CString m_Path; "l2_7ZXsPT
CString m_Number; x@ (91f
//}}AFX_DATA
_^dWJ0
// ClassWizard generated virtual function overrides LWf+H 4iZ}
//{{AFX_VIRTUAL(CCaptureDlg) yD5T'np<4
public: En-eG37l
virtual BOOL PreTranslateMessage(MSG* pMsg); = DvnfT<
protected: "5ah{,
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support xlS
t
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); sR'rY[^/|
//}}AFX_VIRTUAL I6h{S}2
// Implementation ]-["sw
protected: v"=^?5B
HICON m_hIcon; lbTz
// Generated message map functions q'd6\G0}
//{{AFX_MSG(CCaptureDlg) "k5 C? ~
virtual BOOL OnInitDialog(); 's!EAqCN
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ]D%D:>9|/
afx_msg void OnPaint(); <-X)<k
afx_msg HCURSOR OnQueryDragIcon(); u!X[xe;
virtual void OnCancel(); ]%F3 xzOk
afx_msg void OnAbout(); |OuZaCJG
afx_msg void OnBrowse(); GP[;+xMBh
afx_msg void OnChange(); Kl\A&O*{
//}}AFX_MSG l% K9Ke
DECLARE_MESSAGE_MAP() i#&]{]}Qv
}; K|E}Ni
#endif F(}d|z@@
x1?p+
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ?Tt/,Hl?D
#include "stdafx.h" /V-7 u
#include "Capture.h" xlv:+
#include "CaptureDlg.h" A:&
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#include <windowsx.h> ]={:VsnL
#pragma comment(lib,"hook.lib") 4?1Ac7bE
#ifdef _DEBUG -9vAY+s.
#define new DEBUG_NEW +2MsyA?6_
#undef THIS_FILE 9e1gjC\ c
static char THIS_FILE[] = __FILE__; ] QtG gWtC
#endif bG;vl;C
#define IDM_SHELL WM_USER+1 ,HY z-sK.
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); $Y)|&,
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Xq+7l5LP
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Z9 }qds6 y
class CAboutDlg : public CDialog _N0x&9S$
{ q$~S?X5\
public: Fu!:8Wp!(
CAboutDlg(); $A8eMJEpL
// Dialog Data )"=BbMfhu
//{{AFX_DATA(CAboutDlg) r]"
>
enum { IDD = IDD_ABOUTBOX }; (a@cK,
//}}AFX_DATA b{(!Ls_ &
// ClassWizard generated virtual function overrides boJQ3Xc
//{{AFX_VIRTUAL(CAboutDlg) qS+'#Sn
protected: SQW A{f
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ~iydp
//}}AFX_VIRTUAL N@Bqe{r6j
// Implementation YtxBkKiJ2V
protected: Z;SRW92@
//{{AFX_MSG(CAboutDlg) }0}J
//}}AFX_MSG : :e=6i
DECLARE_MESSAGE_MAP() V]`V3cy1+3
}; !V7VM_}@Y
yEzp+Ky
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Ed.~9*m
{ A\.k['!
//{{AFX_DATA_INIT(CAboutDlg) <@(HQuL#
//}}AFX_DATA_INIT JwxI8Pi*y
}
> ")%4@
a}El!7RO0
void CAboutDlg::DoDataExchange(CDataExchange* pDX) (;V]3CtU*
{ X7Cou6r
CDialog::DoDataExchange(pDX); %[Ia#0'Y@
//{{AFX_DATA_MAP(CAboutDlg) C} Ewi-
//}}AFX_DATA_MAP @X
} at
]Lz_\
HOtays,#<}
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) daY^{u3
//{{AFX_MSG_MAP(CAboutDlg) >{ne!
// No message handlers RkP7}ZA;
//}}AFX_MSG_MAP ^V_vpr]}P
END_MESSAGE_MAP() z2wR]G5!
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CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) BY32)8SH
: CDialog(CCaptureDlg::IDD, pParent) ]e7D""
{ +SZ#s:#SE
//{{AFX_DATA_INIT(CCaptureDlg) OKxPf]~4E
m_bControl = FALSE; ?Ju=L|
m_bAlt = FALSE; xBR2tDi%
m_bShift = FALSE; v=iz*2+X
m_Path = _T("c:\\"); O#CxS/M5
m_Number = _T("0 picture captured."); (E\7Ui0Q
nCount=0; 3Akb|r
bRegistered=FALSE; '?wv::t
bTray=FALSE; 2gg5:9
//}}AFX_DATA_INIT -QI1>7sl
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 nke[}Hqf
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); @;JT }R H-
} qf(!3
G{YJ(6etZ
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) %l5Uy??Z
{ A!W(>
CDialog::DoDataExchange(pDX); ^h4Q2Mv o
//{{AFX_DATA_MAP(CCaptureDlg) *.ZV.(
DDX_Control(pDX, IDC_KEY, m_Key); 8.'%wOU@A
DDX_Check(pDX, IDC_CONTROL, m_bControl); /'!F \ kz
DDX_Check(pDX, IDC_ALT, m_bAlt); +w%MwPC7`
DDX_Check(pDX, IDC_SHIFT, m_bShift); MpGWt#
DDX_Text(pDX, IDC_PATH, m_Path); c
R[DT04
DDX_Text(pDX, IDC_NUMBER, m_Number); s:i$ s")
//}}AFX_DATA_MAP (B7M*e
} /J wQ5
!
FhN(L[=j
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) gV$Lfkz
//{{AFX_MSG_MAP(CCaptureDlg) w3fi2B&q
ON_WM_SYSCOMMAND() vAHJP$x
ON_WM_PAINT() |A[Le
;,
ON_WM_QUERYDRAGICON() -8#Of)W
ON_BN_CLICKED(ID_ABOUT, OnAbout) ;UArDw H
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) OAc+LdT
ON_BN_CLICKED(ID_CHANGE, OnChange) r}pYm'e
//}}AFX_MSG_MAP US@ak4Y6Z
END_MESSAGE_MAP() p`T7Y\\#!
.2Y"=|NdA
BOOL CCaptureDlg::OnInitDialog() Mp7r`A,6
{ Pdrz lu
CDialog::OnInitDialog(); li$(oA2
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); !!DHfAV]
ASSERT(IDM_ABOUTBOX < 0xF000); Ko kmylHu
CMenu* pSysMenu = GetSystemMenu(FALSE); ,^`+mP
if (pSysMenu != NULL) =cX&H
{ oju4.1
CString strAboutMenu; !E4YUEY6
strAboutMenu.LoadString(IDS_ABOUTBOX); 7:9WiN5b
if (!strAboutMenu.IsEmpty()) "qMd%RP
{ Y GvtG U-
pSysMenu->AppendMenu(MF_SEPARATOR); }+,1G!?z
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); *=UEx0_!q
} OiJ1&Fz(
} s-3vp
SetIcon(m_hIcon, TRUE); // Set big icon mst-:F[h
SetIcon(m_hIcon, FALSE); // Set small icon 2PAotD4+I
m_Key.SetCurSel(0); '<4/Md[
RegisterHotkey(); FJ}/g
?
CMenu* pMenu=GetSystemMenu(FALSE); x_s9DkX
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); [;83
IoU}
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); `>g:
:
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); P)7SK&]r;=
return TRUE; // return TRUE unless you set the focus to a control cOxF.(L
} gR?=z}`@p
305()
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) jaFBz&P/#
{ NcwZ_*sqj
if ((nID & 0xFFF0) == IDM_ABOUTBOX) b:+.Y$%F-
{
" q0lh
CAboutDlg dlgAbout; j2k,)MHu!x
dlgAbout.DoModal(); QUH USDT
} <t.yn\G-w
else m!tB;:6
{ Go=MG:`
CDialog::OnSysCommand(nID, lParam); 3l-8TR
} <;=?~QK%-
} W(9-XlYKE
=M*31>"I0
void CCaptureDlg::OnPaint() E}b"
qOV
{ >
CZ|Vx
if (IsIconic()) :-69,e
{ 9]xOuCb
CPaintDC dc(this); // device context for painting tF
O27z@
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); wHEt;rc(
// Center icon in client rectangle ![0\m2~iv
int cxIcon = GetSystemMetrics(SM_CXICON); OLXG0@
int cyIcon = GetSystemMetrics(SM_CYICON); ^R!
qxSj
CRect rect; K\,)9:`t
GetClientRect(&rect); dE%rQE7'
int x = (rect.Width() - cxIcon + 1) / 2; ?WKFDL'_0j
int y = (rect.Height() - cyIcon + 1) / 2; L^Fni~
// Draw the icon =j#uH`jgW
dc.DrawIcon(x, y, m_hIcon); j[F\f>
} eYOwdTrq
else +j%!RS$ko
{ +A>>Ak|s
CDialog::OnPaint(); jL<:N
8
} ?<%GYdus
} B#OnooJI
&l/2[>D%4
HCURSOR CCaptureDlg::OnQueryDragIcon() LD0x 4zm$m
{ .Wc<(pfa
return (HCURSOR) m_hIcon; iT227v!s
} RplLU7
.!/DM-C
void CCaptureDlg::OnCancel() X6)-1.T&
{ ;%0$3a
if(bTray) &z+nNkr?yN
DeleteIcon(); zgI!S6q
CDialog::OnCancel(); '-N `u$3Y
} N^*%{[<5
7;2j^qPr
void CCaptureDlg::OnAbout() <v>^#/.0
{ -Wd2FD^x
CAboutDlg dlg; V|13%aE_v
dlg.DoModal(); iP]KV.e'/C
} - 0R5g3^*/
;6KcX \g-
void CCaptureDlg::OnBrowse() "v@Y[QI
{ lmi,P-Q
CString str; z"Miy
BROWSEINFO bi; k Pi%RvuQ
char name[MAX_PATH]; U0 nSI
ZeroMemory(&bi,sizeof(BROWSEINFO)); ;wK;
bi.hwndOwner=GetSafeHwnd(); MxQhkY-=
bi.pszDisplayName=name; Ye% e!
bi.lpszTitle="Select folder"; ZVs]_`(+
bi.ulFlags=BIF_RETURNONLYFSDIRS; {p[{5k 0
LPITEMIDLIST idl=SHBrowseForFolder(&bi); WXV (R,*Tc
if(idl==NULL)
c@7d4Jz
return; %IL]
Wz<
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); N?hQ53#3
str.ReleaseBuffer(); * ?x$q/a
m_Path=str; /99S<U2ej
if(str.GetAt(str.GetLength()-1)!='\\') YcOPqvQ
m_Path+="\\"; duFVh8
UpdateData(FALSE); =PYfk6j9
} =(2y$,6g?
)S@e&a|
void CCaptureDlg::SaveBmp() +pXYBwH
7Q
{ u1a0w
CDC dc; I!eu|_cF
dc.CreateDC("DISPLAY",NULL,NULL,NULL); c<bV3,
CBitmap bm;
U*(/eEtd-
int Width=GetSystemMetrics(SM_CXSCREEN); >HNBTc=~t
int Height=GetSystemMetrics(SM_CYSCREEN); Ne#FBRu5
bm.CreateCompatibleBitmap(&dc,Width,Height); )eIC5>#.
CDC tdc; `@TWZ%f6
tdc.CreateCompatibleDC(&dc); 55q!2>Jh.
CBitmap*pOld=tdc.SelectObject(&bm); Q]$gw,H"6
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); v3O+ ;4
tdc.SelectObject(pOld); 5.! OC5tO
BITMAP btm; #{K}o}
bm.GetBitmap(&btm); fIe';a
DWORD size=btm.bmWidthBytes*btm.bmHeight; ])OrSsV}
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); "AYm*R
BITMAPINFOHEADER bih; <` [o|>A Z
bih.biBitCount=btm.bmBitsPixel; i<@"+~n~GK
bih.biClrImportant=0; )l?1dR:sP
bih.biClrUsed=0; 2 tD{c^
9<
bih.biCompression=0; ~wYGTm=(n
bih.biHeight=btm.bmHeight; x3DUz
bih.biPlanes=1; ,2oF t\`.r
bih.biSize=sizeof(BITMAPINFOHEADER); 3r^Ls[ey
bih.biSizeImage=size; S!WG|75B
bih.biWidth=btm.bmWidth; #O 2g]YH
bih.biXPelsPerMeter=0; 2qd5iOhX+
bih.biYPelsPerMeter=0; [x{z}rYH
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ,+2!&"zD
static int filecount=0; PWci D '!
CString name; q8A ;%.ZLG
name.Format("pict%04d.bmp",filecount++); f euATL]
name=m_Path+name; ,Tp:. "
BITMAPFILEHEADER bfh; tV?-
bfh.bfReserved1=bfh.bfReserved2=0; *.%z
bfh.bfType=((WORD)('M'<< 8)|'B'); +@] ,JlYf
bfh.bfSize=54+size; `vjn,2S}
bfh.bfOffBits=54; )qSjI_qt5
CFile bf;
#zmt x0
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ $40G$w
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 'h}(> %
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); w'[JfMu P
bf.WriteHuge(lpData,size); d*$L$1S
bf.Close(); xVxN
@[
nCount++; #qLsAw--Q
} mrmm@?
GlobalFreePtr(lpData); .A6D&-&z
if(nCount==1) >0F)^W?
m_Number.Format("%d picture captured.",nCount); ncGt-l<9
else tJBj9{
m_Number.Format("%d pictures captured.",nCount); ^?M# |>
UpdateData(FALSE); )[b\wrc
} M$u.lI
{ 9:vq|
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) [#@\A]LO
{ i+q tL3
if(pMsg -> message == WM_KEYDOWN) :;
z]:d
{ 4Jn+Ot.,d
if(pMsg -> wParam == VK_ESCAPE) >Nam@,hm
return TRUE; 3vXa#f>P<
if(pMsg -> wParam == VK_RETURN) 2#
72B
return TRUE; Bnp\G h
} UuS6y9@v
return CDialog::PreTranslateMessage(pMsg); dNu?O>=
} joz0D!-"#
p!>5}f6
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) <-6f}wN
{ %$Dn);6=
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ VLPPEV-u
SaveBmp(); C5Vlqc;
return FALSE; Nl]_Ie6
} %1mIngW=g
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ^'%Q>FVb
CMenu pop; HPMj+xH
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Ec9%RAxl
CMenu*pMenu=pop.GetSubMenu(0); t:x"]K
pMenu->SetDefaultItem(ID_EXITICON); C/?x`2'
CPoint pt; FuC#w 9_
GetCursorPos(&pt); oRo[WQla
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ~4+ICCbH
if(id==ID_EXITICON) ]z O6ESH
DeleteIcon(); ;fW`#aE
else if(id==ID_EXIT) BOflhoUX
OnCancel(); ,ZI#p6
return FALSE; |A.nP9 hW
} dVMduo
LRESULT res= CDialog::WindowProc(message, wParam, lParam); S
awf]/
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) lY&Sx{-
AddIcon(); 6t\0Ui
return res; oeYUsnsbi
} 2=
Y8$-
w=_q<1a
void CCaptureDlg::AddIcon() }y1r
yeW<
{ .[r1Qz7G
NOTIFYICONDATA data; D&o~4Qvc]
data.cbSize=sizeof(NOTIFYICONDATA); J#IVu?B
CString tip; z6*r<>Bf+b
tip.LoadString(IDS_ICONTIP); ^
Paf -/
data.hIcon=GetIcon(0); LC7%Bfn!
data.hWnd=GetSafeHwnd(); o2D;EUsNX
strcpy(data.szTip,tip); ,|g&v/WlC%
data.uCallbackMessage=IDM_SHELL; )[ QT?;
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; qeDXG
data.uID=98; w5 #;Lm
Shell_NotifyIcon(NIM_ADD,&data); NR,R.N^[
ShowWindow(SW_HIDE); :d6]rOpX
bTray=TRUE; j.!5&^;u4
} SoWMP2/
m\oxS;fxWi
void CCaptureDlg::DeleteIcon() ;m=k
FZ?
{ e45)t}'
NOTIFYICONDATA data; "8p<NsU
data.cbSize=sizeof(NOTIFYICONDATA); >Hu3Guik]
data.hWnd=GetSafeHwnd(); B)*1[Jf{4
data.uID=98; :9DyABK=Cv
Shell_NotifyIcon(NIM_DELETE,&data); u9{SG^
ShowWindow(SW_SHOW);
s)jNP\-
SetForegroundWindow(); `PZ\3SC'i
ShowWindow(SW_SHOWNORMAL); 4/V;g%0uN;
bTray=FALSE; TNDp{!<|L;
} J%]5C}v \
1#3eY?Nb
void CCaptureDlg::OnChange() K]1|#`n
{ b")O#v.
RegisterHotkey(); Z;z,dw
} m
7S`u
27i-B\r
BOOL CCaptureDlg::RegisterHotkey() HZ2f|Y|T
{ :%gM
Xsb
UpdateData(); $ y(Qdb
UCHAR mask=0; K5RgWP
UCHAR key=0; ]s0GAp"
if(m_bControl) }vU^gPH
mask|=4; `,O"^zR)z
if(m_bAlt) 'C=(?H)M
mask|=2; #)#J`s1R
if(m_bShift) Q;ZV`D/FA
mask|=1; _%3p&1ld
key=Key_Table[m_Key.GetCurSel()]; ._]*Y`5)d
if(bRegistered){ i%GiWanG
DeleteHotkey(GetSafeHwnd(),cKey,cMask); 2%v6h
bRegistered=FALSE; p' 6h9/
} O6vHo3k
cMask=mask; DJ0jtv6nQ-
cKey=key; )gz]F_
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); _R^ZXtypd
return bRegistered; aeVd.`lxM
} '9'f\
G5|'uKz2"
四、小结 62kA(F0e,
XTA:Y7"O
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。