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:
.}t~'*D
{o_X`rgrL 一、实现方法
+ga k#M"n\ HHDl8lo 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:
vQosPS_2L I`-8Air5f #pragma data_seg("shareddata")
5na~@-9p HHOOK hHook =NULL; //钩子句柄
Uc7mOa}4 UINT nHookCount =0; //挂接的程序数目
S?1AFI9{ static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
xST8|H static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
5D\f8L static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
?pr9f5 static int KeyCount =0;
IUE~_7 static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
K1mPr^3rC #pragma data_seg()
*"?l ]d K28+]qy[ 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。
ALrw\qV }\tdcTMgS 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:
v- T$:cL ;X?}x%$ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
1O/+8yw cKey,UCHAR cMask)
R;s?$;I {
l~c@^! BOOL bAdded=FALSE;
sGyeb5c for(int index=0;index<MAX_KEY;index++){
b LlKe50 if(hCallWnd[index]==0){
~ELNyI11 hCallWnd[index]=hWnd;
2`7==? HotKey[index]=cKey;
GPkmf%FJ HotKeyMask[index]=cMask;
2D75:@JL}| bAdded=TRUE;
xHL( !PF KeyCount++;
d"}k!
0m break;
-G}[AkmS }
cii_U=
}
-~s!73pDY return bAdded;
Rp.Sj{<2 }
zL$@`Eh-KP //删除热键
*w^C"^* BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
PmkR3<=leg {
\Jx04[= BOOL bRemoved=FALSE;
)WRLBFi3 for(int index=0;index<MAX_KEY;index++){
"'c
A2~ if(hCallWnd[index]==hWnd){
>zw.GwN| if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
q*U*Fu+ hCallWnd[index]=NULL;
K{&mI/; HotKey[index]=0;
nxUJN1b!N HotKeyMask[index]=0;
f!\lg bRemoved=TRUE;
`|6'9 KeyCount--;
qaY1xPWz" break;
veMH }
{IxA)v-` }
jr)1(** }
$+P>~X) return bRemoved;
?oVx2LdD| }
M2
,YsHt
OVm\ X &uTSgN DLL中的钩子函数如下:
AJh w }+)fMZz LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
wT;0w3.Z {
Z>QF#."m BOOL bProcessed=FALSE;
+AR5W(& if(HC_ACTION==nCode)
^N7e76VwR {
DK$X2B"c V if((lParam&0xc0000000)==0xc0000000){// 有键松开
JLnH&(O switch(wParam)
{K+icTL3 {
>"|B9Woc case VK_MENU:
%SX|o-B~.o MaskBits&=~ALTBIT;
iX0i2ek break;
h]Wr [v case VK_CONTROL:
4lr(,nPRD MaskBits&=~CTRLBIT;
I KqQ>Z-q~ break;
H\h3TdL case VK_SHIFT:
< vL,*.zd MaskBits&=~SHIFTBIT;
1;C+$ break;
=Q+;=-1 default: //judge the key and send message
@Ws*Q TlV break;
n,jKmA }
i*|\KM?P for(int index=0;index<MAX_KEY;index++){
Z'4./ if(hCallWnd[index]==NULL)
'10oK {m$ continue;
O[I\A[* if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
c9HrMgW {
n!NS(.o SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
tXoWwQD;Y bProcessed=TRUE;
k[bD\' }
@JtM5qB }
JW{rA6? }
q)Lu_6 mg else if((lParam&0xc000ffff)==1){ //有键按下
q"%_tS switch(wParam)
8cU}I4| {
k,85Y$`' case VK_MENU:
GC?ON0g5s MaskBits|=ALTBIT;
gnFr}L&j break;
C9~52+S case VK_CONTROL:
YUx.BZf7 MaskBits|=CTRLBIT;
gYNjzew' break;
1$D_6U:H0 case VK_SHIFT:
9`1O"R/ MaskBits|=SHIFTBIT;
.LZwuJ^; break;
).Fpgxs default: //judge the key and send message
43|XSyS break;
4[.oPK=i }
4[;X{ ! for(int index=0;index<MAX_KEY;index++){
W~zbm] if(hCallWnd[index]==NULL)
d@ i}-; continue;
?\vh9 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
'm4W}F {
)Hpa}FGT SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
B
P2=2)Q bProcessed=TRUE;
Ka[t75~; }
QIB\AAclO }
]QpWih00V }
I/&%]"[^u if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
E8pB;\Z( for(int index=0;index<MAX_KEY;index++){
6{"$nF] if(hCallWnd[index]==NULL)
"/3 db[ continue;
|_] Q$q[[% if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
ePr&!Tz# SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
GO__$%~ //lParam的意义可看MSDN中WM_KEYDOWN部分
55tKTpV }
{ vKLAxc }
{_`^R>"\&w }
23c 8 return CallNextHookEx( hHook, nCode, wParam, lParam );
=-8bsV/l }
;LG#.~f *QwY]j%^ 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
rf?qdd(~cH yUZb#%n BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
O!P H&;H BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
y`F3Hr c :<hXH^n 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
F@mQQ r~/ LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
rf>0H^r {
i(AT8Bo2 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
_J Hd9)[ {
=h0,?]z //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
<~6h|F8 SaveBmp();
cl]Mi
"3_ return FALSE;
[U5\bX@$ }
kS_(wpA …… //其它处理及默认处理
AyNI$Q6Z }
U^Q:Y}^ M-1ngI0H; fz\9 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。
t"=
E^r XZsz/# 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。
mVVD! S 5/R_5 二、编程步骤
D)j(,vt J T-J#Ag 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";
}|g\ 8jq {@+Ty]e 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
Yzh"1|O 0\[Chja 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;
2 lj'"nm MRb-H1+Xf 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;
+z9Q-d%O Q4+gAS9 5、 添加代码,编译运行程序。
d/BM&r LcUh;=r}& 三、程序代码
I1pWaQ0 -=~| ."O ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
~$)2s7
O #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
Pb1*\+ #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
,q}MLTSi #if _MSC_VER > 1000
Hea;?4Vg #pragma once
N+Y]st+ #endif // _MSC_VER > 1000
NWMFtT #ifndef __AFXWIN_H__
bYEy<7)x #error include 'stdafx.h' before including this file for PCH
iV&6nh( #endif
x4E7X_ #include "resource.h" // main symbols
)n2 re?S class CHookApp : public CWinApp
%Z):>' {
{u#;?u=| public:
=<?+#-;p CHookApp();
p-Kz-+A [ // Overrides
/ c AUl // ClassWizard generated virtual function overrides
ti
I.W //{{AFX_VIRTUAL(CHookApp)
>8k_n public:
GBRa.;Kk virtual BOOL InitInstance();
f@Zszt virtual int ExitInstance();
9{
>Ui //}}AFX_VIRTUAL
.^h#_[dp //{{AFX_MSG(CHookApp)
y#U+c*LB // NOTE - the ClassWizard will add and remove member functions here.
S/9DtXQ // DO NOT EDIT what you see in these blocks of generated code !
,n3a
gkPO> //}}AFX_MSG
\l9qt5rS DECLARE_MESSAGE_MAP()
@cFJeOC| };
czS+<
w LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
I@yCTluV$ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
ioYGZ%RG# BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
!bN*\c BOOL InitHotkey();
PE5R7)~A BOOL UnInit();
2zs73:z #endif
9s6U}a'c G#d{,3Gq1 //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
9f&C #include "stdafx.h"
{bJ`~b9e #include "hook.h"
4nh>'v%pD #include <windowsx.h>
>`A9[`$n #ifdef _DEBUG
mF,Y?ax #define new DEBUG_NEW
zi]\<?\X #undef THIS_FILE
`HZ;NRr static char THIS_FILE[] = __FILE__;
|}(`kW #endif
k'Sp. #define MAX_KEY 100
LUM@#3& #define CTRLBIT 0x04
|8My42yf #define ALTBIT 0x02
u~WVGjoQ #define SHIFTBIT 0x01
5hQE4/hH #pragma data_seg("shareddata")
PH+S};Uxv HHOOK hHook =NULL;
B{'( L| UINT nHookCount =0;
VJickXA static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
+^=8ge} static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
56zL"TF` static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
??M"6k static int KeyCount =0;
{>DEsO static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
apg=-^L' #pragma data_seg()
HY&aV2|A1 HINSTANCE hins;
$}>+kHoT{ void VerifyWindow();
+@p%
p BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
mLP.t%?# //{{AFX_MSG_MAP(CHookApp)
y5*Z3"< // NOTE - the ClassWizard will add and remove mapping macros here.
=a@j= // DO NOT EDIT what you see in these blocks of generated code!
-*
WXMzr //}}AFX_MSG_MAP
DAcQz4T` END_MESSAGE_MAP()
4QvsBpz@ :h\Q;? CHookApp::CHookApp()
?o81E2TJO {
n%-R[vW // TODO: add construction code here,
`(_s|-$ // Place all significant initialization in InitInstance
KH(%? }
mlJ!:WG 5|o6v1bM CHookApp theApp;
"4riSxEyF LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
4dO~C {
eYN5;bx)W BOOL bProcessed=FALSE;
6{n!Cb[e if(HC_ACTION==nCode)
F'4w;-ax {
VyzS^AHK if((lParam&0xc0000000)==0xc0000000){// Key up
e4H A7=z switch(wParam)
=5/9%P8j9 {
8<8:+M} case VK_MENU:
A OISs4 MaskBits&=~ALTBIT;
mH%yGBp_ break;
-likj#Z case VK_CONTROL:
y\Ic@-aWI MaskBits&=~CTRLBIT;
1.D,W1s break;
:N4t49i case VK_SHIFT:
LBM ^9W MaskBits&=~SHIFTBIT;
:.Jf0 break;
1FlX'[vh default: //judge the key and send message
U+:m4a break;
_+K_5IO4 }
\m(VdE for(int index=0;index<MAX_KEY;index++){
E"qRw_
~t if(hCallWnd[index]==NULL)
u%}nw :> continue;
9 7GV2]-M if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
=t9\^RIx)? {
Cs9.&Y SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
/fZeWU0W bProcessed=TRUE;
jcuB }
k5:G-BQ: }
9
Vkb>yFX' }
'p>Ra/4 else if((lParam&0xc000ffff)==1){ //Key down
mZSD( switch(wParam)
_jLL_GD {
L ^q""[ case VK_MENU:
w80oXXs[# MaskBits|=ALTBIT;
cq}EZ@ . break;
`A w^H! case VK_CONTROL:
.
$BUw MaskBits|=CTRLBIT;
=Je[c,&j$? break;
tnH2sHby case VK_SHIFT:
Al}6q{E9+8 MaskBits|=SHIFTBIT;
`UD/}j@ break;
_ FpTFfB default: //judge the key and send message
ad*m%9Y1Q break;
W-mQjJ`,B }
&dM.
d! for(int index=0;index<MAX_KEY;index++)
0AZ")<^~7 {
ZCmgs4W! if(hCallWnd[index]==NULL)
w_.F'
E continue;
mq@6Q\Z+ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
,]9P{k]O {
9oYgl1}d SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
* @ 3Ag( bProcessed=TRUE;
w,#>G07D }
em,u(#)& }
)c8rz[i }
fmU { if(!bProcessed){
/]K^
rw[ for(int index=0;index<MAX_KEY;index++){
a1EOJ^}0 if(hCallWnd[index]==NULL)
>AVVEv18 continue;
t;W0"ci9 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
#|L8tuWW SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
+R3k-' > }
39:bzUIF }
PVe
xa|aaX }
@.$| w>>T return CallNextHookEx( hHook, nCode, wParam, lParam );
;_c;0) }
]Lf{Jboo Zq+v6fk_Mn BOOL InitHotkey()
>3p\m {
S\:P-&dC if(hHook!=NULL){
ZP@
$Q%up nHookCount++;
cG[l!Z return TRUE;
24
[+pu }
4{y)TZ else
tr<Nm6! hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
iW$_zgN if(hHook!=NULL)
CAfGH!l! nHookCount++;
]~9tYn return (hHook!=NULL);
$ `ov4W }
8EW_V$>R BOOL UnInit()
aOlT;h {
*=8JIs A>! if(nHookCount>1){
.YhA@8nc~l nHookCount--;
BF\XEm?! return TRUE;
)(bW#- }
LInz<bc<( BOOL unhooked = UnhookWindowsHookEx(hHook);
YWe{juXSw if(unhooked==TRUE){
mk;&yh nHookCount=0;
dG@%jD) hHook=NULL;
%RTBV9LIXr }
<^&ehy:7y return unhooked;
?9!6%]2D }
,)0H3t Bo)3!wO8 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
ni.cTOSx {
nCUg,;_= BOOL bAdded=FALSE;
v\c>b:AofD for(int index=0;index<MAX_KEY;index++){
e%svrJ2 if(hCallWnd[index]==0){
eWCb73 hCallWnd[index]=hWnd;
`#rL*;\uV HotKey[index]=cKey;
joFm]3$; HotKeyMask[index]=cMask;
,f~J`3(& bAdded=TRUE;
qB5j;@r KeyCount++;
1Ir21un break;
k
Z?=AXu }
F^WP <0C }
PRx8I
. return bAdded;
aRj9E} }
$Ipg&`S" caIL&G, BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
C^O
VB- {
=O&%c%~q BOOL bRemoved=FALSE;
$mu^G t for(int index=0;index<MAX_KEY;index++){
HHA<IZ#;, if(hCallWnd[index]==hWnd){
52%2R]G! if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
vmU@^2JSJ hCallWnd[index]=NULL;
Z?6%;n^ 54 HotKey[index]=0;
@3) (BpFe HotKeyMask[index]=0;
qyZ"
%Kz bRemoved=TRUE;
J1,9kCO KeyCount--;
(/z_Q{"N break;
o2nv+fyW }
qU+t/C. }
VrHv)lUr }
m}C>ti`VD return bRemoved;
ap.K=-H }
rA3$3GLQ- Jb0`42 void VerifyWindow()
tRs [ YK {
p)jk>j B for(int i=0;i<MAX_KEY;i++){
rV2WnAb[H& if(hCallWnd
!=NULL){ -z-C*%~
if(!IsWindow(hCallWnd)){ ]s]vZ
hCallWnd=NULL; )P%ZA)l%_o
HotKey=0; lG9bLiFY
HotKeyMask=0; eX?OYDDC0j
KeyCount--; xqeyD* s
} 02f~En}>6
} 4QH3fTv
} ;!=G
} ,$@bE
.7Dtm<K#
BOOL CHookApp::InitInstance() lsJSYJG&
{ ojafy}
AFX_MANAGE_STATE(AfxGetStaticModuleState()); A0/"&Ag]
hins=AfxGetInstanceHandle(); &TnS4O
InitHotkey(); 9Z|jxy
return CWinApp::InitInstance(); rx'RSo#1O
} !`k1:@NZ
_Us#\+]_:
int CHookApp::ExitInstance() Z
8S\@I
{ ?h3Y)5x T
VerifyWindow(); 9{'N{
UnInit(); ?~l6K(*2
return CWinApp::ExitInstance(); a+[RS]le
} HU1h8E$-
n3T>QgK
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file <Q3oT
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) RU'=ERYC
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Pj[PIz
#if _MSC_VER > 1000 Cw
iKi^m
#pragma once 1Lc#m`Jln
#endif // _MSC_VER > 1000 6o!!=}'E[
p09HL%~R
class CCaptureDlg : public CDialog -Y1e8H ='
{ Z)e/!~""]
// Construction i/65v
public: @GPCwE1
BOOL bTray; o@r7
n>G
BOOL bRegistered; Hn7_FOC
BOOL RegisterHotkey(); Mz9r5
UCHAR cKey; ~xbe~$$Q@
UCHAR cMask; %d1,a$*3}
void DeleteIcon(); tnV/xk#!
void AddIcon(); Bgn&:T8<
UINT nCount; BTlk
E tm
void SaveBmp(); m.JBOq=
CCaptureDlg(CWnd* pParent = NULL); // standard constructor j5QuAU8
// Dialog Data .sxcCrQE
//{{AFX_DATA(CCaptureDlg) O)C\vF#
enum { IDD = IDD_CAPTURE_DIALOG }; "$~':) V"
CComboBox m_Key; N"pc,Q\xU
BOOL m_bControl; H~oail{EQ
BOOL m_bAlt; xj<Rp|7&
BOOL m_bShift; Um}
CString m_Path; 5Iy|BRU(%
CString m_Number; 2n,*Nd`
//}}AFX_DATA ~De"?
// ClassWizard generated virtual function overrides +s"hqm
//{{AFX_VIRTUAL(CCaptureDlg) m- %E-nr
public: N/[p <
virtual BOOL PreTranslateMessage(MSG* pMsg); #=D) j
protected: kj|6iG
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 8|b3j^u
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 2;[D;Y}
//}}AFX_VIRTUAL Kh"?%ZIa
// Implementation -<c=US
protected: CHdX;'`*
HICON m_hIcon; aC^\(wp[
// Generated message map functions heltgRt
//{{AFX_MSG(CCaptureDlg) )bA;?i
virtual BOOL OnInitDialog(); gMv.V{vD
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); )}''L{k-
afx_msg void OnPaint(); ?RX3MUN
afx_msg HCURSOR OnQueryDragIcon();
#c!*</
virtual void OnCancel(); b[__1E9v'
afx_msg void OnAbout();
%&$Tz1"
afx_msg void OnBrowse(); !5wIIS:FT
afx_msg void OnChange(); +y,T4^{
//}}AFX_MSG eiuSvyY
DECLARE_MESSAGE_MAP() E0BMv/r8b
}; jAGTD I
#endif YSs)HV.8
062,L~&E
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file "MxnFeLM#
#include "stdafx.h" kHkpx52
#include "Capture.h" ,K>I%_!1
#include "CaptureDlg.h" y6@0O%TDN
#include <windowsx.h> Q0$8j-1I
#pragma comment(lib,"hook.lib") T`/AY?#
#ifdef _DEBUG ,V'o4]H
#define new DEBUG_NEW ,4hJT
#undef THIS_FILE he#J|p
static char THIS_FILE[] = __FILE__; H12Fw'2
#endif h-g+g#*
#define IDM_SHELL WM_USER+1 ke{8 ^X~#
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 7t3X)Ah
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); S,D8F&bg
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; "lQ*1.i
class CAboutDlg : public CDialog ?M$.+V{a
{ 3NZK*!@'
public: s|@6S8E
CAboutDlg(); kM!kD4&
// Dialog Data d; [C6d
//{{AFX_DATA(CAboutDlg) ?8HHA:GP
enum { IDD = IDD_ABOUTBOX }; "-y-iJ
//}}AFX_DATA <
|e,05aM
// ClassWizard generated virtual function overrides p$SX
//{{AFX_VIRTUAL(CAboutDlg) r)qnl9?;`]
protected: "vA}FV%tRq
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support jnd[6v=C7-
//}}AFX_VIRTUAL ai}mOyJs
// Implementation 8][nmjk0
protected: X$%'
//{{AFX_MSG(CAboutDlg) XV!6dh!
//}}AFX_MSG }{M#EP8q+
DECLARE_MESSAGE_MAP() kSC}aN'
}; >AC]#'
"X2 Vrn'
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) -\+s#kE:
{ ~L]|?d"
//{{AFX_DATA_INIT(CAboutDlg) A+HF@Uw}^
//}}AFX_DATA_INIT <Q$@r?Mu]
} r[1i*b$
u,F nAh?"
void CAboutDlg::DoDataExchange(CDataExchange* pDX) !P ~_Dl2d
{ EQ2#/>
CDialog::DoDataExchange(pDX); I6~pV@h^=
//{{AFX_DATA_MAP(CAboutDlg) k-Q%.o
//}}AFX_DATA_MAP aF8fqu\
} jNu9KlN
Yv
hA_v
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) z
MLK7+
//{{AFX_MSG_MAP(CAboutDlg) b6W2^tr-
// No message handlers |lXc0"H[o
//}}AFX_MSG_MAP h"`ucC8X
END_MESSAGE_MAP() m_hN*v
Py
$`APHjijN
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) d#6`&MR
: CDialog(CCaptureDlg::IDD, pParent) a5 *2h{i
{ Y;nZ=9Sw
//{{AFX_DATA_INIT(CCaptureDlg) Z1zVwHa_
m_bControl = FALSE; :iFIQpk
m_bAlt = FALSE; !
N|0x`
m_bShift = FALSE; .e3NnOzyxS
m_Path = _T("c:\\"); `L:CA5sBud
m_Number = _T("0 picture captured."); L Y6;.d$J
nCount=0; XXbqQhf
bRegistered=FALSE; ag$Vgl
bTray=FALSE; C?ulj9=Z
//}}AFX_DATA_INIT nYWvTvZ
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 VQY&g;[d
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); lW<PoT
} 5'0xz.)!
-<Hu!V`+
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) [FK<96.nt
{ OF%B[h&
CDialog::DoDataExchange(pDX); ?in|qevL
//{{AFX_DATA_MAP(CCaptureDlg) &GNxo$CG
DDX_Control(pDX, IDC_KEY, m_Key); K6y :mJYp\
DDX_Check(pDX, IDC_CONTROL, m_bControl); s?zAP O8Sz
DDX_Check(pDX, IDC_ALT, m_bAlt); /V=24\1Ky
DDX_Check(pDX, IDC_SHIFT, m_bShift); 6}75iIKi
DDX_Text(pDX, IDC_PATH, m_Path); ";BlIovT=R
DDX_Text(pDX, IDC_NUMBER, m_Number); 9V,!R{kO!
//}}AFX_DATA_MAP :*t"8;O[
} =81@o,1w
VmCW6
G#M
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) \Z^TXyu
//{{AFX_MSG_MAP(CCaptureDlg) .udv"?!z
ON_WM_SYSCOMMAND() RbCPmiZcH
ON_WM_PAINT() A;5n:Sd
ON_WM_QUERYDRAGICON() *"WDb|PBb
ON_BN_CLICKED(ID_ABOUT, OnAbout) J\J?yo 6
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) <F'X<Bau
ON_BN_CLICKED(ID_CHANGE, OnChange) RlheQTJ
//}}AFX_MSG_MAP cHcmgW\4
END_MESSAGE_MAP() T_X6Ulp
mK[)mC
_8
BOOL CCaptureDlg::OnInitDialog() Qhs/E`k4
{ bfA=3S"0
CDialog::OnInitDialog(); _FXZm50\g{
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ]E_h
ASSERT(IDM_ABOUTBOX < 0xF000); <WjF*x p
CMenu* pSysMenu = GetSystemMenu(FALSE); Vm5c+;
if (pSysMenu != NULL) m~@;~7I x
{ ?s\
OUr
CString strAboutMenu; 3ia^\ jw
strAboutMenu.LoadString(IDS_ABOUTBOX); ?I/qE='*
if (!strAboutMenu.IsEmpty()) z>jUR,!GT
{ }K1JU`Lz
pSysMenu->AppendMenu(MF_SEPARATOR); ?|WoIV.
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); !iH-#B-
} 4&xZ]QC)O5
} DVah
SetIcon(m_hIcon, TRUE); // Set big icon AgOp.~*Z~V
SetIcon(m_hIcon, FALSE); // Set small icon 5~Cakd]>
m_Key.SetCurSel(0); H~GQ;PhRx
RegisterHotkey(); A
6OGs/:&
CMenu* pMenu=GetSystemMenu(FALSE); Na$Is'F&p
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); b8$gx:aJ>$
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); CSGz3uC2D
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ^Y u6w\QM
return TRUE; // return TRUE unless you set the focus to a control nt;haeJ
} RletL)
QYa(N[~a
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) '; = f
{ wj[\B*$?
if ((nID & 0xFFF0) == IDM_ABOUTBOX) GiP`dtK
{ [01.\eh
CAboutDlg dlgAbout; ]Pry>N3G5
dlgAbout.DoModal(); h@:TpE+N
} Ct2j ZqCDo
else #O$
{ AX?fuDLs
CDialog::OnSysCommand(nID, lParam); I8+~ &V}
} [cTe54n
} %STliJ
!O.[PH(,*
void CCaptureDlg::OnPaint() -RO7
'm0
{ r|PFw6
if (IsIconic()) /&CmO>^e
{ d)@<W1;
CPaintDC dc(this); // device context for painting o@#Y8M
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); YLwnhy>dD
// Center icon in client rectangle ME;n^y\8
int cxIcon = GetSystemMetrics(SM_CXICON); D?C)BcN
int cyIcon = GetSystemMetrics(SM_CYICON); aO@7O*
CRect rect; %FS$zOsgGK
GetClientRect(&rect);
}8@M@
int x = (rect.Width() - cxIcon + 1) / 2; N=5)fe%{4
int y = (rect.Height() - cyIcon + 1) / 2; =Zu^8 0/
// Draw the icon NE/m-ILw
dc.DrawIcon(x, y, m_hIcon); W%.v.0
} nSF``pp+
else uch>AuF:
{ p8kr/uMP ;
CDialog::OnPaint(); R)M_|ca
} f6_];]yP
} Xcrk;!IB?
pM{nh00[
HCURSOR CCaptureDlg::OnQueryDragIcon() Z.W66\8~}^
{ s[K^9wz
return (HCURSOR) m_hIcon; Rl qQ
} &ISb~5
:Xn7Ha[f
void CCaptureDlg::OnCancel() !ALKSiSl
{ Yk'9U-.mc
if(bTray) PzV@umC1#f
DeleteIcon(); lz?;#U
CDialog::OnCancel(); &?uz`pv2
} HQUeWCN
.s<*'B7&
void CCaptureDlg::OnAbout() `6[I^qG".
{ ^ K7ic,{
CAboutDlg dlg; %.<H=!$
dlg.DoModal(); QV h4
} 6\u!E~zy
h)6GaJ=
void CCaptureDlg::OnBrowse() 'zEI;v
{ :U
d
CString str; rwniOQe
BROWSEINFO bi; DNR~_3Aq
char name[MAX_PATH]; )mJf|W!Z#
ZeroMemory(&bi,sizeof(BROWSEINFO)); U9&k;`
bi.hwndOwner=GetSafeHwnd(); tV_t6x_.
bi.pszDisplayName=name; Tx1vL
bi.lpszTitle="Select folder"; ?E9D Xg
bi.ulFlags=BIF_RETURNONLYFSDIRS; &O)&k
LPITEMIDLIST idl=SHBrowseForFolder(&bi); ?9HhG?_x
if(idl==NULL) RP2_l$
return; DbZ0e5
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 7R3fqU.Rq
str.ReleaseBuffer(); PN$X N<
m_Path=str; osOVg0Gyj
if(str.GetAt(str.GetLength()-1)!='\\') +B'8|5tPX
m_Path+="\\"; Z<#hS=eY
UpdateData(FALSE); 4<lQwV6=
} ( 7ws{)
^pS+/ZSi^
void CCaptureDlg::SaveBmp() !PMU O\y
{ &SAH2xR
CDC dc; \XF}?*8
dc.CreateDC("DISPLAY",NULL,NULL,NULL); |+:h|UIUQ
CBitmap bm; (=16PYs
int Width=GetSystemMetrics(SM_CXSCREEN); y8s!M
int Height=GetSystemMetrics(SM_CYSCREEN); [3W*9j
bm.CreateCompatibleBitmap(&dc,Width,Height); ;uqx@sx ;
CDC tdc; `:wvh(
tdc.CreateCompatibleDC(&dc); tM,%^){p$
CBitmap*pOld=tdc.SelectObject(&bm); 'JdkUhq1V
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); WKrX,GF
tdc.SelectObject(pOld); rZojY}dWJ
BITMAP btm; 6cdMS[_SD(
bm.GetBitmap(&btm); R*zO
dxY
DWORD size=btm.bmWidthBytes*btm.bmHeight; !j1[$% =#
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ygSL
BITMAPINFOHEADER bih; R8-^RvG
bih.biBitCount=btm.bmBitsPixel; R//$r%a
bih.biClrImportant=0; 2oZ9laJO
bih.biClrUsed=0; X 6lH|R
bih.biCompression=0; ;' nL:\
bih.biHeight=btm.bmHeight; >sD4R}\})
bih.biPlanes=1; w-b' LP
bih.biSize=sizeof(BITMAPINFOHEADER); Vvt ;
bih.biSizeImage=size; Kzb`$CGK
bih.biWidth=btm.bmWidth; R0;efD
bih.biXPelsPerMeter=0; )9B:wc"
bih.biYPelsPerMeter=0; G~wF nl%
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 3Wcy)y>2Ap
static int filecount=0; 8ZcU[8r
CString name; J9%@VZut
name.Format("pict%04d.bmp",filecount++); <&pKc6+{
name=m_Path+name; &[a Tw{2
BITMAPFILEHEADER bfh; D-IR!js ]
bfh.bfReserved1=bfh.bfReserved2=0; Sd))vS^g
bfh.bfType=((WORD)('M'<< 8)|'B'); w?mEuXc
bfh.bfSize=54+size; #.5vC5
bfh.bfOffBits=54; m,>
CFile bf; p<`+sf}A:
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ s$DrR
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); pi@Xkw
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); fd8!KO
bf.WriteHuge(lpData,size); VW@ x=m
bf.Close(); t` 8!AhOgc
nCount++; }wwe}E-e
} \aP6_g:N}
GlobalFreePtr(lpData); `7+j0kV)
if(nCount==1) 9
L?;FY)_
m_Number.Format("%d picture captured.",nCount); %8)W0WMe
else Qn:kz*:
m_Number.Format("%d pictures captured.",nCount); PzZZ>7_6S
UpdateData(FALSE); Y&*x4&Lb
} G",.,Px
K?u(1
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) +m,!e*g
{ ?@R")$
if(pMsg -> message == WM_KEYDOWN) p|XAlia
{ 8I+d)(:
if(pMsg -> wParam == VK_ESCAPE) g):]'
return TRUE; ]Z4zF"@
if(pMsg -> wParam == VK_RETURN) E-ZRG!)[v
return TRUE; E1Q0k5@
} ekQrW%\3
return CDialog::PreTranslateMessage(pMsg); BF8"rq}r0
} X6RQqen3:
Uh|>Skic4
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) GZ}/leR
{
BRbV7&
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ohc1 ~?3b
SaveBmp(); Bmo$5$
return FALSE; VjbG(nB?_
} W W "i
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){
0=6/yc
CMenu pop; nhdTTap&9
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 0O2n/`'
CMenu*pMenu=pop.GetSubMenu(0); sI 4yG
pMenu->SetDefaultItem(ID_EXITICON); U!e6FHj7
CPoint pt; 2L\3S ukj
GetCursorPos(&pt); .tF|YP==
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); {<w
+3Va
if(id==ID_EXITICON) q]<xMg#nu
DeleteIcon(); ,
fb(
WY
else if(id==ID_EXIT) N
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OnCancel(); r$nkU4N'
return FALSE; h3Fo-]0
} )QY![&k}1z
LRESULT res= CDialog::WindowProc(message, wParam, lParam); tSv0" L
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) +=cam/A
AddIcon(); We`'>'W0
return res; ^[->
)
} Y?Vz(udD
o;`!kIQ
void CCaptureDlg::AddIcon() QLbMPS
{ @qK<T
NOTIFYICONDATA data; BIWD/|LQ
data.cbSize=sizeof(NOTIFYICONDATA); qeaA&(|5
CString tip; @?&Wm3x9
tip.LoadString(IDS_ICONTIP); EychR/s
data.hIcon=GetIcon(0); rhY_|bi4P
data.hWnd=GetSafeHwnd(); K5ZnS`c;
strcpy(data.szTip,tip);
S2=%x.
data.uCallbackMessage=IDM_SHELL; 0^_MN~s(X
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; C|z%P}u#p
data.uID=98; #i@h{R01
Shell_NotifyIcon(NIM_ADD,&data); %!.M~5mCd
ShowWindow(SW_HIDE); t6u-G+}
bTray=TRUE; 4/wwn6I}G
}
Iao[Pyk
WPY8C3XO
void CCaptureDlg::DeleteIcon() #*%fu
{ t&c&KFK)I&
NOTIFYICONDATA data; pZ+j[!
data.cbSize=sizeof(NOTIFYICONDATA); T$b\Q
data.hWnd=GetSafeHwnd(); D6=HYqdj
data.uID=98; BpT"~4oV5
Shell_NotifyIcon(NIM_DELETE,&data); qj?2%mK`
ShowWindow(SW_SHOW); Sa]Ek*
SetForegroundWindow(); V
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ShowWindow(SW_SHOWNORMAL); 5RA<Z.
bTray=FALSE; o+)A'S
} /)1v9<vM"
]XrE
void CCaptureDlg::OnChange() zW'/2W.
{ 4DM L
RegisterHotkey(); jmW^`%;7
} l]vohLz
3!
fykI,!
BOOL CCaptureDlg::RegisterHotkey() tSw>@FM
{ G.VYp6)5
UpdateData(); I]sqi#h$2W
UCHAR mask=0; 7,_-XV2
UCHAR key=0; \j:gr>4
if(m_bControl) E\e]K
!
mask|=4; =jIxI,
if(m_bAlt) nGZ\<-
mask|=2; Ff/Ig]Lb
if(m_bShift) r%!FmS<
mask|=1; mq`5w)S)\o
key=Key_Table[m_Key.GetCurSel()]; T0L+z/N_m.
if(bRegistered){ A#:8X1w
DeleteHotkey(GetSafeHwnd(),cKey,cMask); 5fq.*1f
bRegistered=FALSE; cqg=8$ RB
} {(HxG4~
cMask=mask; `Yogq)G}
cKey=key; -c$z 2Q)
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 92(~'5Qr
return bRegistered; FrR9{YTA.
} j7sU0"7^
OPJgIU%
四、小结 C5B=NAc
Dh8(HiXf:
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。