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:
E/3i_R
2q
NA\-0i> 一、实现方法
C09rgEB\B {;L,|(o^ 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:
Cqs+ o^q Ka_g3 #pragma data_seg("shareddata")
^Q\Hy\ HHOOK hHook =NULL; //钩子句柄
gkM Q=;Nn UINT nHookCount =0; //挂接的程序数目
$} @gR]
Z static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
:R{pV7<O static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
kR+7JUq] static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
6!`GUU static int KeyCount =0;
n)Z u> static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
[ *~2Ts #pragma data_seg()
45,): U5 Tc.QzD\ 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
0H+!v :#VdFMC< DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
9+iz+ .6=;{h4cpB BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
i91 =h cKey,UCHAR cMask)
~m'8<B5+ {
h+ms%tNT BOOL bAdded=FALSE;
}G)2HTaZ for(int index=0;index<MAX_KEY;index++){
Ox5Es if(hCallWnd[index]==0){
*N|ak = hCallWnd[index]=hWnd;
TE5J
@I HotKey[index]=cKey;
tb^/jzC HotKeyMask[index]=cMask;
j "s7P% bAdded=TRUE;
j8G$ , ~v KeyCount++;
l$&dTI<# break;
Y3\EX }
s&4&\Aq}x# }
*Fg)`M3g return bAdded;
7 w<e^H? }
nWes,K6T //删除热键
iYf)FPET BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
#De a$ {
fm^J- BOOL bRemoved=FALSE;
wVq9t|V for(int index=0;index<MAX_KEY;index++){
8:;]tt if(hCallWnd[index]==hWnd){
DDq?4 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
i-}Tt<^ hCallWnd[index]=NULL;
n)j0h- HotKey[index]=0;
I
6'!b/ HotKeyMask[index]=0;
p/qu4[Mm bRemoved=TRUE;
xi<yB0MoA KeyCount--;
Yr*!T= z break;
R.\]JvqO }
1=h5Z3/fj }
KO\-|#3y> }
~:
fSD0 return bRemoved;
:Xs4 C%H; }
4wN5 x[vp >m:n6M'r ~>H,~</` DLL中的钩子函数如下:
6M
;lD5(> *10qP?0H LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
|[0Ijm2 {
[1Aoj| BOOL bProcessed=FALSE;
T/.U Mw if(HC_ACTION==nCode)
O^!Bc}$
{
0@um if((lParam&0xc0000000)==0xc0000000){// 有键松开
~.4y* & switch(wParam)
&lgzNC9g% {
~Zn|( case VK_MENU:
AmZW=n2^ MaskBits&=~ALTBIT;
{;|pcx\L6~ break;
ULhXyItL case VK_CONTROL:
BIS ., MaskBits&=~CTRLBIT;
9q+W>wt break;
n2~WUK case VK_SHIFT:
k 1a?yH)= MaskBits&=~SHIFTBIT;
Ai"MJ6) break;
2+/r~LwbK default: //judge the key and send message
dW22v! break;
fk9q 3 }
-G~/ GO for(int index=0;index<MAX_KEY;index++){
}d>Xh8:%) if(hCallWnd[index]==NULL)
D@O5G d continue;
lcLDCt? if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
L/E7xLz {
E+ |K3EJ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
DgK*>A bProcessed=TRUE;
ACy}w?D< }
>9mj/P D }
C=(Q0-+L| }
(?g+.]Dt, else if((lParam&0xc000ffff)==1){ //有键按下
p>i8aN switch(wParam)
$)nPj_h {
+_k A&Q(t case VK_MENU:
V7}'g6X MaskBits|=ALTBIT;
c&P/v#U_ break;
1V9A nzwX case VK_CONTROL:
S?6-I,]h MaskBits|=CTRLBIT;
s)fahc(@E break;
Hj(K*z case VK_SHIFT:
c|(J%@B) MaskBits|=SHIFTBIT;
?PS?_+E\L break;
Lq$ig8V:O7 default: //judge the key and send message
T*gG <8 break;
%t$KVV }
eEfGH for(int index=0;index<MAX_KEY;index++){
tSux5yV if(hCallWnd[index]==NULL)
4Y}Nu continue;
IdMwpru( if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
*>"NUHq {
%6%mf>Guf SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
}K@m4`T bProcessed=TRUE;
)-ojm$ }
B'Jf&v }
4:S]n19nq }
SSCs96 if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
0g6sGz= for(int index=0;index<MAX_KEY;index++){
2 S~( P if(hCallWnd[index]==NULL)
2@lGY_O!m continue;
|5%T) if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
by0K:*C SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
=+UtAf<n //lParam的意义可看MSDN中WM_KEYDOWN部分
`"}).{N]C }
/t`,7y3T }
+ue1+# }
k\qFWFR return CallNextHookEx( hHook, nCode, wParam, lParam );
`)5WA{z }
F\&{ >& \+nV~Pi"A 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:
&tvtL f^*Yqa BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
NtM ?Jh BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
& !ds#- iNfAn& 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:
=+K?@;? kW2DKr-[ LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
RD"-(T {
i}zz!dJTE if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
Tg"? TZO~ {
$'>JG9M //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
|U;O HS SaveBmp();
99`w'Nlk return FALSE;
{d*OJ/4 }
343d`FRa} …… //其它处理及默认处理
DO* }
q^<HG] j'U1lEZm2 {J
izCUo_' 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
3N-pND0>p ~##FW|N) 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
h@NC#Iod vpf.0!zh 二、编程步骤
[520!JhZY \eNB L[ 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
M;Pry3J lq "X_M$ 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
-z+,j(@ 8U(o@1PT 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;
[tof+0Y6 h'};spv 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;
B~ i ]vB\yQE 5、 添加代码,编译运行程序。
+a^gC
y]+5Y.Cw$ 三、程序代码
_~;%zFX vm[*+&\2 ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
7@>/O)>(AS #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
u>.a; BO #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
G 3,v'D5 #if _MSC_VER > 1000
@L~erg>8= #pragma once
]"HaE-`% #endif // _MSC_VER > 1000
#@OPi6.#!< #ifndef __AFXWIN_H__
GW'v\O #error include 'stdafx.h' before including this file for PCH
+pme]V|< #endif
; veD?| #include "resource.h" // main symbols
"r_wgl% class CHookApp : public CWinApp
oRSA&hSs {
ZHN'j ]? public:
j\IdB:}j CHookApp();
64mEZ_kG, // Overrides
z9[TjTH^}T // ClassWizard generated virtual function overrides
WYTqQqQk //{{AFX_VIRTUAL(CHookApp)
qE[YZ(/f0& public:
vs=q<Uw) virtual BOOL InitInstance();
"lw|EpQk` virtual int ExitInstance();
C 5gdvJN //}}AFX_VIRTUAL
c/tB_] //{{AFX_MSG(CHookApp)
hBpa"0F // NOTE - the ClassWizard will add and remove member functions here.
z8ZQL.z%h // DO NOT EDIT what you see in these blocks of generated code !
PBb&.< //}}AFX_MSG
9/29>K_ DECLARE_MESSAGE_MAP()
"E\mj'k };
.gDq+~r8O LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
$Q8
&TM}E BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
CA0XcLiFt BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
rX?ZUw?u& BOOL InitHotkey();
hI!BX};+} BOOL UnInit();
eNK
+)<PK( #endif
)h]#:,pm =?.oH|&\h //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
uStAZ~b\ #include "stdafx.h"
O6G'!h\F #include "hook.h"
]$Z:^"JS3 #include <windowsx.h>
t kj #ifdef _DEBUG
Y /_CPY #define new DEBUG_NEW
dREY m}1 #undef THIS_FILE
3r kcIVO static char THIS_FILE[] = __FILE__;
`"&Nw,C #endif
A_oZSUrR #define MAX_KEY 100
WM
?a1j #define CTRLBIT 0x04
Pn OWQ8= #define ALTBIT 0x02
`L`+`B #define SHIFTBIT 0x01
{owuYVm #pragma data_seg("shareddata")
K-C,n~- HHOOK hHook =NULL;
r)'vn[A UINT nHookCount =0;
|}
b+$J static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
`R8&(kQ static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
d6QrB"J` static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
Pn">fWRCx static int KeyCount =0;
0dC5
-/+ static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
ZAgXz{!H( #pragma data_seg()
>[|N%9\ HINSTANCE hins;
'1ySBl1> void VerifyWindow();
K'r;#I|"J BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
l(sVnhL6h //{{AFX_MSG_MAP(CHookApp)
%/y=_G // NOTE - the ClassWizard will add and remove mapping macros here.
#mu L-V // DO NOT EDIT what you see in these blocks of generated code!
(~^fx\-S //}}AFX_MSG_MAP
,<tJ`,0X END_MESSAGE_MAP()
6I@j$edZ k(dakFaC^ CHookApp::CHookApp()
BM,hcTr? {
v{a%TA9- // TODO: add construction code here,
dz9U.:C // Place all significant initialization in InitInstance
Z{0BH{23 }
1}DA| !~ mg'q-G`\< CHookApp theApp;
c("|xe LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
>%U+G0Fq {
\s5Uvws BOOL bProcessed=FALSE;
h.>SVQzU if(HC_ACTION==nCode)
E:pk'G0bZ {
~Xxmj!nOf if((lParam&0xc0000000)==0xc0000000){// Key up
#%p44%W switch(wParam)
/=/Ki%hh {
f*XCWr case VK_MENU:
@=VxWU MaskBits&=~ALTBIT;
M-"j8:en break;
_K~h?
\u case VK_CONTROL:
LN5LT'CE MaskBits&=~CTRLBIT;
DYr#?} 40 break;
MJ)lZ!KZ case VK_SHIFT:
#4'wF4DR@ MaskBits&=~SHIFTBIT;
I1E9E$m5\< break;
.Az36wD default: //judge the key and send message
E?XaU~cpc break;
! dzgi: }
c}o 6Rm50 for(int index=0;index<MAX_KEY;index++){
Sf, z if(hCallWnd[index]==NULL)
pD$4nH4KST continue;
':wf%_Iw if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
c
3QgX4vq {
J2W-l{`r< SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
~:z.Xu5m bProcessed=TRUE;
Pq omi!1 }
LW]fme<V? }
=*,SD }
K?^;|m- else if((lParam&0xc000ffff)==1){ //Key down
`-L?x2)U switch(wParam)
dM-cQo: {
e,p"=/!aY case VK_MENU:
^&eF916H MaskBits|=ALTBIT;
JnBUW" break;
SN{+ P k case VK_CONTROL:
iNA3Y MaskBits|=CTRLBIT;
C 5.3[ break;
lhN@,q case VK_SHIFT:
6L<:>55 MaskBits|=SHIFTBIT;
3^o(\=-JX break;
k6Kc{kY default: //judge the key and send message
=:WZV8@% break;
8v"rM
>[ }
M5`v^> for(int index=0;index<MAX_KEY;index++)
*DF3juf~ {
"Lbsq\W> if(hCallWnd[index]==NULL)
q3$8"Q^ continue;
s:U:Dv if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
03 @aG {
5CkG^9 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
K|P0nJT bProcessed=TRUE;
!/is+
xp }
y*i&p4Y* }
2zBk#c+ }
7=l~fKu if(!bProcessed){
\]tBwa for(int index=0;index<MAX_KEY;index++){
S>yi D`v if(hCallWnd[index]==NULL)
r6m^~Wq!} continue;
Xul`>8y| if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
x%B_v^^^ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
?Z#N9Z~\ }
T`bYidA }
,"%C.9a }
&GP(yj] return CallNextHookEx( hHook, nCode, wParam, lParam );
/s\ mV }
g&Vhu8kNIA }Ce9R2
BOOL InitHotkey()
gmL~n7m:K {
hw
DxGiU if(hHook!=NULL){
fq7#rZCxX nHookCount++;
.a*?Pal@@ return TRUE;
U: 9&0`k( }
pi"H?EHk else
,-pE/3|( hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
sU_K^=6* if(hHook!=NULL)
f@OH~4FG nHookCount++;
;,4*uU'vq return (hHook!=NULL);
}%< ?] }
Dp'urf\*$ BOOL UnInit()
BPY7O {
;KL7SM%g4 if(nHookCount>1){
D#g-mqar: nHookCount--;
@Kpm&vd( return TRUE;
;vH2r~ }
c+:ZmrP/ BOOL unhooked = UnhookWindowsHookEx(hHook);
#dauXUKH if(unhooked==TRUE){
kuEXNi1l nHookCount=0;
Q"QRF5Ue hHook=NULL;
ewMVUq*: }
F]$ Nu return unhooked;
mrTf["K }
Ni_H1G @ st>#]i4 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
dN{At- {
y~9wxK BOOL bAdded=FALSE;
~MG6evm & for(int index=0;index<MAX_KEY;index++){
42Z:J 0 if(hCallWnd[index]==0){
7>Scf hCallWnd[index]=hWnd;
Y 6a`{' HotKey[index]=cKey;
|L<JOQ HotKeyMask[index]=cMask;
RNT9M:w bAdded=TRUE;
?WI v4 KeyCount++;
/vQ)$;xf# break;
V}E['fzBFV }
o0H^J,6gV }
`Y&`2WZ ~ return bAdded;
$S6(V}yh }
?%O>]s km%r{ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
>F$9&s& {
QQJGqM3a2 BOOL bRemoved=FALSE;
T\6Qr$t for(int index=0;index<MAX_KEY;index++){
X`8<;l if(hCallWnd[index]==hWnd){
A(y6]E! if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
1-kuK<KR hCallWnd[index]=NULL;
V3,C5KKk&z HotKey[index]=0;
9jal D
X HotKeyMask[index]=0;
omfX2Oa2 bRemoved=TRUE;
A*h8 o9M KeyCount--;
>.?yz break;
r_7%|T8 }
vXJs.)D7 }
P;5)Net1X }
OM EwGr( return bRemoved;
pH' Tx> }
^twyy9VR iq;\}, void VerifyWindow()
579Q&|L. {
e,(Vy for(int i=0;i<MAX_KEY;i++){
<a R if(hCallWnd
!=NULL){ UylIxd
if(!IsWindow(hCallWnd)){ !yNU-/K
hCallWnd=NULL; l6'KIg
HotKey=0; 1mFH7A($
HotKeyMask=0; '(]Wtx%9"
KeyCount--; Wv4$Lgr
} (:iMs)
iO{
} Qf:e;1F!
} c &c
} 8lk/*/} =<
re/-Yu$'
BOOL CHookApp::InitInstance() }9OMXLbRv
{ X@~/.H5
AFX_MANAGE_STATE(AfxGetStaticModuleState()); pSx5ume95"
hins=AfxGetInstanceHandle(); lxn/97rA
InitHotkey(); 1hbQ30
return CWinApp::InitInstance();
exWQ~&
} 1j2U,_-
S'x ]c#
int CHookApp::ExitInstance() rJ/HIda
{ VwR\"8r3
VerifyWindow(); !}=eXDn;A_
UnInit(); XT^=v6^H
return CWinApp::ExitInstance(); ]}`t~#Irz
} -jjB2xP
8:Hh;nl
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 5OdsT-y
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) i4YskhT
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ h7]+#U]mi
#if _MSC_VER > 1000 49"C'n0wST
#pragma once ~}OaX+!
#endif // _MSC_VER > 1000 ;D'm=uOl
|gkNhxzB
class CCaptureDlg : public CDialog <:-4GJH=
{ zC*FeqFL<
// Construction 7FwtBO
public: ".jO2GO^
BOOL bTray; `0upm%A
BOOL bRegistered; WsTIdr36x
BOOL RegisterHotkey(); O_ #++G
UCHAR cKey; v&:[?<6-
UCHAR cMask; 'DW|a
void DeleteIcon(); g}~s"Sz
void AddIcon(); veDv14
UINT nCount; zlLZ8b+
void SaveBmp(); 3Ei^WDJ
CCaptureDlg(CWnd* pParent = NULL); // standard constructor W[jg+|
// Dialog Data 0\i\G|5
//{{AFX_DATA(CCaptureDlg) 6jpzyf=~
enum { IDD = IDD_CAPTURE_DIALOG }; +[}y`
-t
CComboBox m_Key; @<K<"`~H
BOOL m_bControl;
yz [pF
BOOL m_bAlt; aG1Fj[,
BOOL m_bShift; -~z@W3\
CString m_Path; T4x%3-4;
CString m_Number; .XgY&5Qk
//}}AFX_DATA ^E%R5JN
// ClassWizard generated virtual function overrides -#%M,Qb
//{{AFX_VIRTUAL(CCaptureDlg) w&@tP^`
public: Pll%O@K
virtual BOOL PreTranslateMessage(MSG* pMsg); X
-1r$.
protected: LR&MhG7
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support i,^-9
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); lLQcyi0
//}}AFX_VIRTUAL Q`i@['?p
// Implementation
:%sG'_d
protected: oDS7do
HICON m_hIcon; k3&68+
// Generated message map functions A8ViJ
//{{AFX_MSG(CCaptureDlg) cLyf[z)W
virtual BOOL OnInitDialog(); /yU#UZ4;
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Z +/3rd
afx_msg void OnPaint(); cRI2$|
afx_msg HCURSOR OnQueryDragIcon(); jl59;.P
virtual void OnCancel(); S^R dj ]
afx_msg void OnAbout(); @ws&W=NQ
afx_msg void OnBrowse(); JQb{?C
afx_msg void OnChange(); Vu_oxL}
//}}AFX_MSG e&ti(Q=
DECLARE_MESSAGE_MAP() Ft;x@!h%
}; |HAbZd7PG
#endif U]pE{^\w
gwNZ`_Q
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file >~d'i
#include "stdafx.h" 5[2kk5,
#include "Capture.h" #2|biTJ
#include "CaptureDlg.h" P}'B~~9W
#include <windowsx.h> uznqq}
#pragma comment(lib,"hook.lib") }#g]qK
#ifdef _DEBUG /y1+aTiJ
#define new DEBUG_NEW <uU<qO;6
#undef THIS_FILE ="G2I\
static char THIS_FILE[] = __FILE__;
[<r.M<3
#endif b4:{PD~Mh
#define IDM_SHELL WM_USER+1 K1YxF
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); jNbVp{%/S}
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); h5P ]`r
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; _G)A$6weU
class CAboutDlg : public CDialog ;Q3[} ]su
{ 62;xK-U
public: nK< v
CAboutDlg(); (e_<~+E
// Dialog Data = ~s+<9c]
//{{AFX_DATA(CAboutDlg) _an0G?7
enum { IDD = IDD_ABOUTBOX }; C}9GrIi
//}}AFX_DATA Z|KDi
`S
// ClassWizard generated virtual function overrides Lapeh>1T
//{{AFX_VIRTUAL(CAboutDlg) #6~KO7}
protected: 7.2G}O6$
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support RKzO$T
//}}AFX_VIRTUAL ZxOo&YR3
// Implementation {zd[8TJ~xa
protected: cK[=IE5
//{{AFX_MSG(CAboutDlg) d&G]k!|\
//}}AFX_MSG }e|cszNRd
DECLARE_MESSAGE_MAP() Z=$-S(>J
}; eSIG+{;&
d@^%fVhG
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Xz:ha>}C
{ ;\|GU@K{hC
//{{AFX_DATA_INIT(CAboutDlg) NxA4*_|H9
//}}AFX_DATA_INIT v`L]dY4,
} %J'/ cmR&
;k0Jl0[}
void CAboutDlg::DoDataExchange(CDataExchange* pDX) .dYv.[?hL
{ zT}vaU6
CDialog::DoDataExchange(pDX); h#Rza-?"\
//{{AFX_DATA_MAP(CAboutDlg) hrJ(] [8
//}}AFX_DATA_MAP Yt =)=n
} Bi9Q8#lh
ObZhQ.&
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) RFsUb:%V7-
//{{AFX_MSG_MAP(CAboutDlg) x?A<X2
// No message handlers *Dq ++
//}}AFX_MSG_MAP byP< !p*
END_MESSAGE_MAP() )Vy0V=
dHAT($QG
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) `uLr^G=;
: CDialog(CCaptureDlg::IDD, pParent) WnGi;AGH=1
{ ~u!V_su]GY
//{{AFX_DATA_INIT(CCaptureDlg) ?zP
2
m_bControl = FALSE; t+d7{&B
m_bAlt = FALSE; |d~'X%b%
m_bShift = FALSE; M^OYQf
m_Path = _T("c:\\"); ^6{op3R_
m_Number = _T("0 picture captured."); U<F|A!Fg
nCount=0; 6.tA$#6HP
bRegistered=FALSE; gT=pO`a
bTray=FALSE; L1+s0g>
//}}AFX_DATA_INIT NKEmY-f;
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 wWx{#!W
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); iEI#J!~
} G*_]Lz(N
FS)#
v
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) >jiez,
{ sk07|9nU
CDialog::DoDataExchange(pDX); O..{wdZy
//{{AFX_DATA_MAP(CCaptureDlg) ^AI02`c.
DDX_Control(pDX, IDC_KEY, m_Key); 2::YR?
DDX_Check(pDX, IDC_CONTROL, m_bControl); kWa5=BW2f
DDX_Check(pDX, IDC_ALT, m_bAlt); ,K@[+ R!
DDX_Check(pDX, IDC_SHIFT, m_bShift); LRWM}'.s
DDX_Text(pDX, IDC_PATH, m_Path); [X /s^42
DDX_Text(pDX, IDC_NUMBER, m_Number); z3 ^_C`(F
//}}AFX_DATA_MAP 'aV'Am+:
} -B/'ArOo]
^kC!a>&
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) .>r3ZwrE'
//{{AFX_MSG_MAP(CCaptureDlg) V=&M\58
ON_WM_SYSCOMMAND() _U LzA
ON_WM_PAINT() R#YeE`K
ON_WM_QUERYDRAGICON() 9D`K#3}
ON_BN_CLICKED(ID_ABOUT, OnAbout) x'?p?u~[
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) SAitufS
ON_BN_CLICKED(ID_CHANGE, OnChange) "~.4z,ha
//}}AFX_MSG_MAP Yh^8
!
END_MESSAGE_MAP() RiAMW|M"C
kf<c[ su
BOOL CCaptureDlg::OnInitDialog() CvZ\Z472.j
{ A4rMJ+!5
CDialog::OnInitDialog(); %A3m%&(m&%
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); WB_BEh[>j
ASSERT(IDM_ABOUTBOX < 0xF000); OXpN8Dh5
CMenu* pSysMenu = GetSystemMenu(FALSE); fD(r/~Vu
if (pSysMenu != NULL) IS!OO<
{ (x\VGo
CString strAboutMenu; I0H]s/*C%9
strAboutMenu.LoadString(IDS_ABOUTBOX); qAd=i0{N
if (!strAboutMenu.IsEmpty()) n8)&1
q?V
{ $nW9VMa
pSysMenu->AppendMenu(MF_SEPARATOR); \p.yR.
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); >l%8d'=Jl
} w-R.)
} zjow %
SetIcon(m_hIcon, TRUE); // Set big icon /;}%E
SetIcon(m_hIcon, FALSE); // Set small icon J2
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m_Key.SetCurSel(0); ?%~^PHgZ|
RegisterHotkey(); L#'XN H"
CMenu* pMenu=GetSystemMenu(FALSE); Gt?l 2s
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); g5pFr=NV
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); :JX2GRL4
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); .vy@uT,
return TRUE; // return TRUE unless you set the focus to a control d^M*%a z
} !x
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"P|n'Mx
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) M?My+o T
{ 2z#S|$
if ((nID & 0xFFF0) == IDM_ABOUTBOX) cNwHY
Z'
{ )qMbk7:v\
CAboutDlg dlgAbout; opm_|0
dlgAbout.DoModal(); jDQ ?b\^
} EFx>Hu/[G
else )=iv3nF?6N
{ <b *sn]l
CDialog::OnSysCommand(nID, lParam); 9M($_2,44
} k]$oir
} P%Vq#5
a:l-cZ/!
void CCaptureDlg::OnPaint() uJH[C>
{ \X\f~CB
if (IsIconic()) /i27F2NQm
{ Z- a
CPaintDC dc(this); // device context for painting Djc-f
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); vK+reXE
// Center icon in client rectangle A-uIZ
zC
int cxIcon = GetSystemMetrics(SM_CXICON); LWTPNp:"{w
int cyIcon = GetSystemMetrics(SM_CYICON); z7AWWr=H
CRect rect; flC%<V%'-
GetClientRect(&rect); =&pLlG
int x = (rect.Width() - cxIcon + 1) / 2; 6hd<ys?
int y = (rect.Height() - cyIcon + 1) / 2; 3+uL@LXd
// Draw the icon *-Yw%uR
dc.DrawIcon(x, y, m_hIcon); T_D] rMl
} .1;UEb|T
else ;>5`Y8s6
{ MIr+4L
CDialog::OnPaint(); M.s'~S7y
} NNbdP;=:u
} TvDC4tm-:
kD;pj3o&"2
HCURSOR CCaptureDlg::OnQueryDragIcon() ^Z;zA@[wt
{ AnX<\7bc}
return (HCURSOR) m_hIcon; ZfqN4
} 6MY<6t0a
hchG\i
void CCaptureDlg::OnCancel() m#8[")a$"
{ vaP`'
if(bTray) X|Y(* $?D7
DeleteIcon(); K y%lu^
CDialog::OnCancel(); 9-{=m+|b
} o.fqJfpj
,I5SAd|dX
void CCaptureDlg::OnAbout() EV{Ys}3M
{ (oX!D(OI
CAboutDlg dlg; kUS]g
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dlg.DoModal(); `q<W %'Tb$
} U7D!w$4
&5R|{',(Y
void CCaptureDlg::OnBrowse() 'n,V*9
{ bz#]>RD
CString str; =iKl<CqI$E
BROWSEINFO bi; cXqYO|3/M
char name[MAX_PATH]; C[
mTVxd
ZeroMemory(&bi,sizeof(BROWSEINFO)); kq5X<'MM9N
bi.hwndOwner=GetSafeHwnd(); P* `*^r3
bi.pszDisplayName=name; 1,;X4/*
bi.lpszTitle="Select folder"; p+V#86(3
bi.ulFlags=BIF_RETURNONLYFSDIRS; dV'EiNpf
LPITEMIDLIST idl=SHBrowseForFolder(&bi); *QiQ,~Ep
if(idl==NULL) rfEWh
Vy(}
return; f!#!
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); / 'qoKof
str.ReleaseBuffer(); 9)'f)60^
m_Path=str; lh"*$.j-
if(str.GetAt(str.GetLength()-1)!='\\') c'eZ-\d{
m_Path+="\\"; ]n|Jc_Y
UpdateData(FALSE); m:?"|.]
} (XVBH1p"
\/Mx|7<
void CCaptureDlg::SaveBmp() ,oA<xP-*
{ esnq/
CDC dc; 6ABK)m-y
dc.CreateDC("DISPLAY",NULL,NULL,NULL); [#q>Aq$11
CBitmap bm; W~ET/h
int Width=GetSystemMetrics(SM_CXSCREEN); (n*:LS=0
int Height=GetSystemMetrics(SM_CYSCREEN); p8!T)
?|
bm.CreateCompatibleBitmap(&dc,Width,Height); A'KH_])
CDC tdc; [rT.k5_
tdc.CreateCompatibleDC(&dc); [|KvlOvP
CBitmap*pOld=tdc.SelectObject(&bm); ?PT>V,&
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); v wEbGx
tdc.SelectObject(pOld); nlNk
BITMAP btm;
qt~=47<d
bm.GetBitmap(&btm); :HO5
T
DWORD size=btm.bmWidthBytes*btm.bmHeight; <ErX<(0`ig
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); )|lxzlk
BITMAPINFOHEADER bih; pqfX}x
bih.biBitCount=btm.bmBitsPixel; R^*baiXVI
bih.biClrImportant=0;
zd=O;T;.
bih.biClrUsed=0; ?qaWt/m
bih.biCompression=0; >SK:b/i
bih.biHeight=btm.bmHeight; (6S'wb
bih.biPlanes=1;
L\PmT
bih.biSize=sizeof(BITMAPINFOHEADER); c lB K
bih.biSizeImage=size; ccHf+=
bih.biWidth=btm.bmWidth; s;Gd`-S>d
bih.biXPelsPerMeter=0; ">oySo.B?
bih.biYPelsPerMeter=0; 3O/#^~\'hW
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 8#7qHT;cx
static int filecount=0; +
t5SrO!`
CString name; Tf86CH=)5
name.Format("pict%04d.bmp",filecount++); _VKI@
name=m_Path+name; *i]?J
BITMAPFILEHEADER bfh; (jc& Fk
bfh.bfReserved1=bfh.bfReserved2=0; IA@>'O
bfh.bfType=((WORD)('M'<< 8)|'B'); hL&$` Q
bfh.bfSize=54+size; aaR& -M@
bfh.bfOffBits=54; ;XurH%Mg
CFile bf; /D&&7;jJ
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ hF,|()E[
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); nMyl(kF[
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); XVN`J]XHk
bf.WriteHuge(lpData,size); U-I,Q+[C[^
bf.Close(); ?Afe}
nCount++; 3=YpZ\l}
} __g
k:a>oQ
GlobalFreePtr(lpData); -r={P_E6
if(nCount==1) \l~^dn}
m_Number.Format("%d picture captured.",nCount); *5%vU|9b
else R c+olJ^5
m_Number.Format("%d pictures captured.",nCount); &<PIm
UpdateData(FALSE); P]43FPb
} V\;Xa0
_B0(1(M<2
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) \wK&wRn)
{ VVas>/0qr
if(pMsg -> message == WM_KEYDOWN) 5qb93E"C
{ {]T?) !Vm
if(pMsg -> wParam == VK_ESCAPE) @Vre)OrN#
return TRUE; ]4l2jY
if(pMsg -> wParam == VK_RETURN) UTD_rQ
return TRUE; hIJtu;}zU
} {%R^8
return CDialog::PreTranslateMessage(pMsg); *q=T1JY
} GJeG7xtJKl
y|5L%,i
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) -]Z7^
{ r/j:A#6M]o
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Dr3_MWJ+
SaveBmp(); ,vR?iNd:q[
return FALSE; 8 "l
PiW3
} v'W{+>.
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ l P F326e
CMenu pop; i2,4:M)CV
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 1RRE{]2v#
CMenu*pMenu=pop.GetSubMenu(0); VeYT[Us"
pMenu->SetDefaultItem(ID_EXITICON); 7IX8ck[D
CPoint pt; v>8C}d^
GetCursorPos(&pt); @+gr/Pul^
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); J}#gTG( '
if(id==ID_EXITICON) )}ev;37<C
DeleteIcon(); >'*%wf[{
else if(id==ID_EXIT) 6 c_#"4
OnCancel(); -s3`mc}*
return FALSE; xZ'fer`&
} 'C1lP)S5
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ytZ o0pad
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) kxMvOB$
AddIcon(); $w0TEO!
return res; $DY#04Je\=
} Jo5B mh0
U#jz5<r
void CCaptureDlg::AddIcon() @/z\p7e
{ M@Th^yF+8H
NOTIFYICONDATA data; H;/do-W[
data.cbSize=sizeof(NOTIFYICONDATA); Mog>W&U
CString tip; [,o:nry'a
tip.LoadString(IDS_ICONTIP); ,Z
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data.hIcon=GetIcon(0); 5h5izA'0'
data.hWnd=GetSafeHwnd(); v e&d"8+]
strcpy(data.szTip,tip); 7>N~l
data.uCallbackMessage=IDM_SHELL; |P
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data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 'f5
8Jwql
data.uID=98; Rx-\B$G
Shell_NotifyIcon(NIM_ADD,&data); fN&,.UB^p
ShowWindow(SW_HIDE); e^y9Kmd
bTray=TRUE; 'ygKP6M
} uo#1^`P
J(7#yg%5
void CCaptureDlg::DeleteIcon() !oWB5x~:P
{ J @Hg7Faz
NOTIFYICONDATA data; |[SHpcq>
data.cbSize=sizeof(NOTIFYICONDATA); s L^+$Mq6
data.hWnd=GetSafeHwnd(); 6"&cQ>$xh
data.uID=98; d?zSwLsl
Shell_NotifyIcon(NIM_DELETE,&data); g)Lf^
ShowWindow(SW_SHOW); BEDkyz;:
SetForegroundWindow(); yf&g\ke
ShowWindow(SW_SHOWNORMAL); ,aP6ct
bTray=FALSE; ;wn9
21r
} pY31qhoZ.
dGUP|O
void CCaptureDlg::OnChange() Sdu\4;(
{ #])"1fk
RegisterHotkey(); z`{sD]
} (GJtTp~2C4
_Mw3>GNl
BOOL CCaptureDlg::RegisterHotkey() D2$9$xeR
{ UB$}`39@
UpdateData(); L'+bVP{L
UCHAR mask=0; ]
ZV[}7I.
UCHAR key=0; [`n_> p!
if(m_bControl) `Fd
\dn
mask|=4; gRLt0&Q~
if(m_bAlt) W A/dt2D|
mask|=2; hA7=:LG
if(m_bShift) ;ku>_sG-
mask|=1; \+
se%O
key=Key_Table[m_Key.GetCurSel()]; :""HyjY!
if(bRegistered){ 'RjEdLrI
DeleteHotkey(GetSafeHwnd(),cKey,cMask); Lq(=0U\"P
bRegistered=FALSE; _.5{vGyxr
} 'OY4Q'Z
cMask=mask; &Hoc`u
cKey=key; >h7(kj:
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 67j kU!
return bRegistered; j~q 7v
`":
} y=Y k$:-y
Q]WBH_j
四、小结 :?M_U;;z2+
DQG%`-J
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。