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:
\ bNN]=
9y "R, 一、实现方法
yAz`n[ z UN&L7D 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:
8,d<&3D .-2i9Bh6 #pragma data_seg("shareddata")
dF$a52LS HHOOK hHook =NULL; //钩子句柄
cy T,tN UINT nHookCount =0; //挂接的程序数目
Eh/B[u7T[ static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
kcGs2Y_*& static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
xF![3~~3[ static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
7DQ{#Gf#G static int KeyCount =0;
Z.TYi~d/9D static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
~5g2~.&* #pragma data_seg()
' P5ttI#| d~n|F|`: 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。
WsO'4~X9 E:'TZ4Z 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:
/qM:;:N%j KKB&)R BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
{/d<Jm: cKey,UCHAR cMask)
#D4gNQg@R {
{6d)|';% BOOL bAdded=FALSE;
rV;X1x}l for(int index=0;index<MAX_KEY;index++){
r1dP9MT\8 if(hCallWnd[index]==0){
]U?)_P@} hCallWnd[index]=hWnd;
,tqMMBwC~_ HotKey[index]=cKey;
GxjmHo HotKeyMask[index]=cMask;
/=4 m4
bAdded=TRUE;
2IDN?Mw KeyCount++;
>.'rN>B+ break;
c4H5[LPF }
_nW{Q-nh }
'e
@`HG
return bAdded;
kYMKVR }
2GB)K?1M //删除热键
/BeA-\B BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
2UqLV^ZY {
P|c[EUT BOOL bRemoved=FALSE;
$d\]s]}` for(int index=0;index<MAX_KEY;index++){
ai|d`:; if(hCallWnd[index]==hWnd){
u~[=5r if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
3,;;C( hCallWnd[index]=NULL;
CRXIVver HotKey[index]=0;
Y.FqWJP=p HotKeyMask[index]=0;
n~`1KC4 bRemoved=TRUE;
KA^r,Iw KeyCount--;
'VVEd[ break;
Am>^{qh9 }
;J<K/YdI }
4I&e_b< 30 }
mIk8hA@B_ return bRemoved;
k/'>,WE }
l}\q }7\) J4Yu|E<& }C6RgE.6< DLL中的钩子函数如下:
]nmVT~lBe" H$G`e'`OZ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
l6kq P {
)g;*u,C BOOL bProcessed=FALSE;
)P>-~G2P if(HC_ACTION==nCode)
+bO]9*g] {
!mX-g]4E if((lParam&0xc0000000)==0xc0000000){// 有键松开
2GRL`.1 switch(wParam)
uUy~$>V {
:<Z>?x case VK_MENU:
j_w"HiNBA MaskBits&=~ALTBIT;
i6Zsn#Z7) break;
_d<xxF^q case VK_CONTROL:
kF,_o/Jc MaskBits&=~CTRLBIT;
1^R[kaY break;
v2ab case VK_SHIFT:
YC,)t71l{ MaskBits&=~SHIFTBIT;
.eZsKc-@ break;
PRTn~!Z0 default: //judge the key and send message
#H8% BZyV break;
~6bf-Wg'X }
! J7ExfEA for(int index=0;index<MAX_KEY;index++){
l:Hm|9UZ if(hCallWnd[index]==NULL)
<.d^jgG(j continue;
IZw>!KYG if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
9|('* {
mT:Z!sS SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
nogdOGo bProcessed=TRUE;
Uxll<z, }
qHQWiu%h }
gjbSB6[ }
lxVA:tz0 else if((lParam&0xc000ffff)==1){ //有键按下
APR"%(xD# switch(wParam)
16pk4f8 {
)c;zNs case VK_MENU:
P84uEDY MaskBits|=ALTBIT;
>5%;NI5
G break;
z&R
#j case VK_CONTROL:
3_5]0:?]- MaskBits|=CTRLBIT;
ZjB]pG+ break;
z+~klv3 case VK_SHIFT:
$27QY MaskBits|=SHIFTBIT;
N?Nu' break;
}I )%G w default: //judge the key and send message
|O!G[|/3 break;
[p:mja.6y }
!Au@\/} for(int index=0;index<MAX_KEY;index++){
Q)lN7oD if(hCallWnd[index]==NULL)
mBtXa|PJ continue;
|``rSEXYs if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
-%,3qhsd {
&N+i3l6` SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
GJeP~ bProcessed=TRUE;
KFuPgp }
^F="'/Pq[ }
vAV{HBQ* }
CW+] Jv]" if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
Ow3t2G for(int index=0;index<MAX_KEY;index++){
O_S%PX if(hCallWnd[index]==NULL)
|qAU\m"Pc continue;
kWZ@v+Mk3 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
;Yr?"| SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
1*VArr6*6 //lParam的意义可看MSDN中WM_KEYDOWN部分
:svKE.7{ }
mD"[z}r) }
Md5|j0#p }
n)bbEXO return CallNextHookEx( hHook, nCode, wParam, lParam );
pRez${f.(s }
.@`5>_ pl4:>4l/ 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:
Tu[I84 C"
2K U* BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
Uv|?@zy# BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
<0h,{28 {^jRV@ 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:
W{l{O1, 4^IqHx;bj LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
Cx[Cst` {
H'_ v if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
RF|r@/S {
%s;=H)8 //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
*U}cj A:ZN SaveBmp();
W|I<hY\X return FALSE;
:G8:b. }
!8@8 …… //其它处理及默认处理
g)**)mz[ }
n~mP7X%wE7 ]*&`J4i AK_,$'f 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。
]ME2V .`TDpi9OB 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。
mr[+\
5 v"v-c!k 二、编程步骤
_7bQR7s bQ`|G(g-d 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";
TOge!Q>a tVr^1Y 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
\jCN ]A< JE=3V^k 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;
F5s`AjU ;/R \!E
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;
E
5N9.th =#.qe= 5、 添加代码,编译运行程序。
xO0}A1t
Wd @p2XaqZ 三、程序代码
]ddTHl yLY$1#Sa ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
1x3>XN]a #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
y8Oz4| #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
T$&vk#qr #if _MSC_VER > 1000
]q":ta!f #pragma once
sD{d8s[( #endif // _MSC_VER > 1000
,w|Or}h]7 #ifndef __AFXWIN_H__
x4Wu`-4^ #error include 'stdafx.h' before including this file for PCH
@;b @O
_ #endif
9lR- #include "resource.h" // main symbols
qo!6)Z class CHookApp : public CWinApp
RemjiCE0' {
F['%?+<3 public:
|Ca
%dg9$@ CHookApp();
{9;x\($&a // Overrides
3'xmq // ClassWizard generated virtual function overrides
(/e[n.T //{{AFX_VIRTUAL(CHookApp)
Lz:Q6 public:
+ :;6kyM6X virtual BOOL InitInstance();
kVY0
E virtual int ExitInstance();
l<8+>W`_ //}}AFX_VIRTUAL
-Crm#Ib~ //{{AFX_MSG(CHookApp)
y.,li< // NOTE - the ClassWizard will add and remove member functions here.
XQI!G_\+C // DO NOT EDIT what you see in these blocks of generated code !
&S9O:>=* //}}AFX_MSG
,b,t^xX>) DECLARE_MESSAGE_MAP()
Y0;66bfh} };
ZO*?02c LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
r3mmi5 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
l",X BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
16|miK[@ BOOL InitHotkey();
o!Y61S( BOOL UnInit();
xWxgv;Ah #endif
hnTk)nq5# eEZZ0NNe; //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
6|B;C #include "stdafx.h"
J}Ji / #include "hook.h"
Rd|M) #include <windowsx.h>
7Rl/F1G o} #ifdef _DEBUG
v&3 Oc #define new DEBUG_NEW
9FcH\2J #undef THIS_FILE
()ZP=\L static char THIS_FILE[] = __FILE__;
T_I ApC #endif
?!;i/h*{ #define MAX_KEY 100
/?B%,$~ #define CTRLBIT 0x04
[t+qYe8 #define ALTBIT 0x02
P ,*yuF|bk #define SHIFTBIT 0x01
[{-5 #pragma data_seg("shareddata")
wCw_aXqq HHOOK hHook =NULL;
byN4?3F UINT nHookCount =0;
Nc\jA= static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
;uyQ R8 static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
DP08$Iq static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
hpOK9 static int KeyCount =0;
J5L[)Gd)D static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
aBT8mK -. #pragma data_seg()
B]wfDUG HINSTANCE hins;
dz,4);Mg void VerifyWindow();
&.chqP(| BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
ueu=$.^;g //{{AFX_MSG_MAP(CHookApp)
~^v*f // NOTE - the ClassWizard will add and remove mapping macros here.
5D<"kT // DO NOT EDIT what you see in these blocks of generated code!
=(Pk7{ //}}AFX_MSG_MAP
IcUE=J END_MESSAGE_MAP()
,ek0)z. JXqwy^f CHookApp::CHookApp()
-5u. Ix3
{
PD`EtkUnv // TODO: add construction code here,
M|IgG:a;T // Place all significant initialization in InitInstance
@q <d^]po }
is6d:p !+Zso& CHookApp theApp;
mt]50}eK LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
3fq'<5 ^ {
EE,C@d!*k7 BOOL bProcessed=FALSE;
m=qyPY if(HC_ACTION==nCode)
d'!abnF[d {
%R@&8 if((lParam&0xc0000000)==0xc0000000){// Key up
wt1Y&D switch(wParam)
f,:2\b?. {
a{+;&j[! case VK_MENU:
NUM+tg>KM MaskBits&=~ALTBIT;
my*E7[ break;
,%$Cfu case VK_CONTROL:
fk'DJf[M MaskBits&=~CTRLBIT;
9YVr9BM'K break;
6UAw9
'X8 case VK_SHIFT:
K(heeZUt MaskBits&=~SHIFTBIT;
[5wU0~>' break;
o>MB8[r default: //judge the key and send message
'$y.`/$ break;
QR(j7>+J^ }
'=1@,Skj- for(int index=0;index<MAX_KEY;index++){
y7-daek if(hCallWnd[index]==NULL)
=aCd,4B} continue;
4ad-' if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Tk:%YS;= {
+{[E Ow SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
Oz4yUR bProcessed=TRUE;
c'uDK> }
R7ExMJw }
]:Sb#=,!&! }
g]m}@b6(h else if((lParam&0xc000ffff)==1){ //Key down
Mk|*=#e; switch(wParam)
?7Skk {
]6;oS-4gu? case VK_MENU:
E#/vgm=W; MaskBits|=ALTBIT;
I^!c1S break;
tN-B`d1 case VK_CONTROL:
7-2,|(Xg MaskBits|=CTRLBIT;
&U{"dJ r break;
'aJm4W&j case VK_SHIFT:
KJCi4O& MaskBits|=SHIFTBIT;
?jHu, break;
d;E
(^l default: //judge the key and send message
^=,N]
j break;
D~r{(u~Ya }
"= >8UR for(int index=0;index<MAX_KEY;index++)
_2rxDd1#. {
EQ2HQz] if(hCallWnd[index]==NULL)
v0,&wdi continue;
e|Mw9DIW if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
3y]rhB {
?oulQR6: SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
0JX/@LNg0 bProcessed=TRUE;
u!9bhL` }
-< }#ImTN }
z[*Y%o8-r }
L;'C5#GN if(!bProcessed){
?v$1Fc55 for(int index=0;index<MAX_KEY;index++){
=801nZJ if(hCallWnd[index]==NULL)
HRW}Yl continue;
@+(a{%~7y if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
:AM_C^j~
D SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
$S2kc$'F }
=(Wl'iG }
_{48s8V }
m"tke'a return CallNextHookEx( hHook, nCode, wParam, lParam );
L0>w|LpRc }
;7bY>zc(w /*hS0xN* BOOL InitHotkey()
7,,#f&jP {
~_W>ND if(hHook!=NULL){
@j+X>TD nHookCount++;
'Z`fZ5q return TRUE;
, \R,O }
.q_SA-!w> else
HFTDea +# hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
axLO: Q, if(hHook!=NULL)
C5&+1VrP nHookCount++;
!)h?2#V8; return (hHook!=NULL);
=qF DrDt }
Wm>AR? b BOOL UnInit()
/<it2= {
Zm#qW2a]P if(nHookCount>1){
Y"'k $jS- nHookCount--;
%a$Fsn return TRUE;
'QxPQcU }
5HMDug;
BOOL unhooked = UnhookWindowsHookEx(hHook);
.9KW|(uW if(unhooked==TRUE){
Nj|~3
*KO nHookCount=0;
z+F:_ hHook=NULL;
O:Ob{k }
bZi;jl return unhooked;
`)_11ywZ }
FaA7m GN
?1dwI BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
?Qdp#K]WX {
+d/^0^(D\5 BOOL bAdded=FALSE;
\X0wr%I for(int index=0;index<MAX_KEY;index++){
b%M|R%)] if(hCallWnd[index]==0){
[Se0+\,& hCallWnd[index]=hWnd;
8!VFb+ HotKey[index]=cKey;
6 jo+i[h HotKeyMask[index]=cMask;
2mVLR;s{_ bAdded=TRUE;
~ZXAW~a} KeyCount++;
C!J6"j break;
~n`G>Oe3 }
\|q.M0 }
2Ik@L, return bAdded;
X^ZUm }
i"U<=~ XIJ{qrDr BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
P'q ._U {
`8N],X BOOL bRemoved=FALSE;
*'hvYl/?> for(int index=0;index<MAX_KEY;index++){
nO7#m~ if(hCallWnd[index]==hWnd){
G?QU|<mj< if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
VKXZA2<?' hCallWnd[index]=NULL;
DsH`I%w{ HotKey[index]=0;
`-[+(+[" HotKeyMask[index]=0;
8GFA}_(^R bRemoved=TRUE;
ZeYkZzN KeyCount--;
sKuPV break;
7{:g|dX }
_HkB+D0v }
B^sHFc""V }
Zfn390 _ return bRemoved;
gC}D0l[ }
'P5|[du+ =| M[JPr void VerifyWindow()
20p/p~< {
(8/Qt\3jv for(int i=0;i<MAX_KEY;i++){
yyVv@ if(hCallWnd
!=NULL){ %Lwd1'C%
if(!IsWindow(hCallWnd)){ 3O!TVSo
hCallWnd=NULL; g&6O*vx
HotKey=0; 4Iou|
H
HotKeyMask=0; W mT(>JBO
KeyCount--; Z,bv D'u
} \qh
-fW; #
}
.4-I^W"1
} POCF T0R}
} zO07X*Bw
J((.zLvz
BOOL CHookApp::InitInstance() sCF7K=a
{ !rMl" Y[
AFX_MANAGE_STATE(AfxGetStaticModuleState()); 4$<-3IP,
hins=AfxGetInstanceHandle(); ^>f jURR
InitHotkey(); 7,N>u8cTh
return CWinApp::InitInstance(); C5jR||
} )wwQv2E
X[
o9^<
int CHookApp::ExitInstance() "x$RTuWA9
{ KGI0|Z]n~
VerifyWindow(); 7VwLyy
UnInit(); P"WnU'+
return CWinApp::ExitInstance(); ]
x_WO_
} \PB ~6
044*@a5f
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file {%;KkC8=R
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) jW-j+WGSM
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ (SlrV8;
#if _MSC_VER > 1000 gB?~!J?
#pragma once (mJqI)m8
#endif // _MSC_VER > 1000 H.ZmLB
,~_)Cf#CB
class CCaptureDlg : public CDialog cn4CK.?
{ G;%Pf9o26
// Construction 6T_Mk0Sf+
public: buhn~ c
BOOL bTray; F"-w
BOOL bRegistered; $LF
BOOL RegisterHotkey();
Bjz\L0d
UCHAR cKey; s2@}01QPo
UCHAR cMask; _~`\TS8
void DeleteIcon(); NgnHo\)
void AddIcon(); *L9s7RR
UINT nCount; T$'GFA
void SaveBmp(); ?wR;"
CCaptureDlg(CWnd* pParent = NULL); // standard constructor syYg, G[
// Dialog Data Hop$w
//{{AFX_DATA(CCaptureDlg) <4W"ne28
enum { IDD = IDD_CAPTURE_DIALOG }; fFfH9 cl!
CComboBox m_Key; 2>l:: 8Pp
BOOL m_bControl; !$>d75zli
BOOL m_bAlt; 2dr[0tE
BOOL m_bShift; ~nk'ZJ
CString m_Path; nuB@Fkr
CString m_Number; F`ifHO
//}}AFX_DATA w\'Zcw,d
// ClassWizard generated virtual function overrides xi=qap=S^9
//{{AFX_VIRTUAL(CCaptureDlg)
]8q5k5~
public: b-{\manH
virtual BOOL PreTranslateMessage(MSG* pMsg); ,0#5kc*X
protected: 26E"Ui5q
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support .d5|Fs~B
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); gno V>ON0
//}}AFX_VIRTUAL W.ud<OKP90
// Implementation b\%=mN
protected: OH28H),}
HICON m_hIcon; 7"r7F#D=G
// Generated message map functions -P 5VE0
//{{AFX_MSG(CCaptureDlg) S#X$QD
virtual BOOL OnInitDialog(); 2oAPJUPOJ
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ^b`}g
afx_msg void OnPaint(); -0Q:0wU
afx_msg HCURSOR OnQueryDragIcon(); 0:**uion
virtual void OnCancel(); :XMw="u=
afx_msg void OnAbout(); <v"C`cga
afx_msg void OnBrowse(); *0y+=,"QU
afx_msg void OnChange(); 'f<0&Ci8
//}}AFX_MSG j8@YoD5o
DECLARE_MESSAGE_MAP() 2;4Of~
}; &tKs
t,UR8
#endif <}%>a@
&j/ WjZPF
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file +b]g;
#include "stdafx.h" 6:B[8otQ
#include "Capture.h" cW,wN~
#include "CaptureDlg.h" 2|o6~m<pE
#include <windowsx.h> Um\Nd#=:
#pragma comment(lib,"hook.lib") g?M\Z";
#ifdef _DEBUG $6:j3ZTXrt
#define new DEBUG_NEW |Gjd
#undef THIS_FILE nD.4c-hd$q
static char THIS_FILE[] = __FILE__; @.-g
#endif DT(A~U<y
#define IDM_SHELL WM_USER+1 BpCzmU
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); PDX^MYoN
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); O!sZMGF$p
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; SPL72+S`,
class CAboutDlg : public CDialog N40.GL0s
{ q:-8W[_
public: $qy%Q]
CAboutDlg(); ' R~x.NM
// Dialog Data '@HWp 8+
//{{AFX_DATA(CAboutDlg) s_K:h
enum { IDD = IDD_ABOUTBOX }; [e ;K$
//}}AFX_DATA SMgf(N3]
// ClassWizard generated virtual function overrides $dci?7q
//{{AFX_VIRTUAL(CAboutDlg) #:{PAt
protected: UioLu90
P
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support /g'F +{v
//}}AFX_VIRTUAL hH{&k>
// Implementation E$f.&<>T
protected: v%V$@MF
//{{AFX_MSG(CAboutDlg) ^o|igyS9
//}}AFX_MSG /bVU^vo
DECLARE_MESSAGE_MAP() +"T?.,
}; G F,/<R #
G[6V=G
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ?`,UW; Br6
{ I2%{6g@
//{{AFX_DATA_INIT(CAboutDlg) LKxyj@Eq
//}}AFX_DATA_INIT zF(I#|Vo
} s9qr;}U.`
j;1X-
void CAboutDlg::DoDataExchange(CDataExchange* pDX) &~G>pvZ
{ 8@Xq ,J
CDialog::DoDataExchange(pDX); E@R7b(:*
//{{AFX_DATA_MAP(CAboutDlg) -GCGxC2u
//}}AFX_DATA_MAP >&e|ins^N
} W:b8m Xx
<;+&`R
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) g-meJhX%
//{{AFX_MSG_MAP(CAboutDlg) k%/Z.4vQG
// No message handlers qWtvo';3
//}}AFX_MSG_MAP 5>"$95D
END_MESSAGE_MAP() xgL*O>l)
@1gX>!
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) U9IN# ;W
: CDialog(CCaptureDlg::IDD, pParent) Gu|}ax"
{ p-y,OG
//{{AFX_DATA_INIT(CCaptureDlg) d;9 X1`"
m_bControl = FALSE; QOEcp% 6I}
m_bAlt = FALSE; x g/3*rL
m_bShift = FALSE; ?W9$=
m_Path = _T("c:\\"); AlIFTNg:"
m_Number = _T("0 picture captured."); ]k]P (w
nCount=0; lycY1 lK
bRegistered=FALSE; 7:R8QS9
bTray=FALSE; |JSj<~1ki
//}}AFX_DATA_INIT QW|,_u5j
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 'F?T4
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); t@>Uc`%
} |OUr=b
&$qqF&
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) <E|i3\[p
{ d11~mU\
CDialog::DoDataExchange(pDX); 5K;jW
//{{AFX_DATA_MAP(CCaptureDlg) ~0!s5
DDX_Control(pDX, IDC_KEY, m_Key); bB->\
DDX_Check(pDX, IDC_CONTROL, m_bControl); TV#pUQ3K
DDX_Check(pDX, IDC_ALT, m_bAlt); g03I<<|@
DDX_Check(pDX, IDC_SHIFT, m_bShift); G 2+A`\]
DDX_Text(pDX, IDC_PATH, m_Path); zdzTJiY2[Z
DDX_Text(pDX, IDC_NUMBER, m_Number); 4H]Go~<
//}}AFX_DATA_MAP Im+<oZ
} TPt<(-}W
/^G1wz2
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 6OF&Q`*4
//{{AFX_MSG_MAP(CCaptureDlg) D1;H,
ON_WM_SYSCOMMAND() t`o-HWfS.
ON_WM_PAINT() xD,BlDV
ON_WM_QUERYDRAGICON() "b8<C>wY
ON_BN_CLICKED(ID_ABOUT, OnAbout) vtK Qv Q
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) `-"2(Gp
ON_BN_CLICKED(ID_CHANGE, OnChange) "Up3W%]SB
//}}AFX_MSG_MAP y>3Zh5=
END_MESSAGE_MAP() A/|To!R
c]v$C&FX
BOOL CCaptureDlg::OnInitDialog() (xBS~}e
{ (Gp/^[.%&
CDialog::OnInitDialog(); TIbiw
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); eqb8W5h'
ASSERT(IDM_ABOUTBOX < 0xF000); 3J32W@}.K
CMenu* pSysMenu = GetSystemMenu(FALSE); Ya<S/9c
if (pSysMenu != NULL) MxD,xpf
{ @Z&El:]3>
CString strAboutMenu; mFw`LvH?*
strAboutMenu.LoadString(IDS_ABOUTBOX); KbQ UA$gL=
if (!strAboutMenu.IsEmpty()) 2%'{f
{ <La$'lG4J
pSysMenu->AppendMenu(MF_SEPARATOR); -hiG8%l5
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); SpU+y|\[0
} O; 7`*}m
} ?{NP3
SetIcon(m_hIcon, TRUE); // Set big icon "-88bF~
SetIcon(m_hIcon, FALSE); // Set small icon I} m\(TS-"
m_Key.SetCurSel(0); Ly"u }e
RegisterHotkey(); eY)ugq>'
CMenu* pMenu=GetSystemMenu(FALSE); pwtB{6)VH{
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); oDogM`T`
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); \1cay#X
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); y[:\kI
return TRUE; // return TRUE unless you set the focus to a control P$ZIKkf
} l=ehoyER
~[l6;bn
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) fb3(9
{ 4{=zO(>
if ((nID & 0xFFF0) == IDM_ABOUTBOX) l\xcR]O
{ D1rXTI$$
CAboutDlg dlgAbout; ;gLHSHEA
dlgAbout.DoModal(); ecDni>W
} b;G3&R]
else y.(Yh1
{ &*}`uJt
CDialog::OnSysCommand(nID, lParam); W=:4I[a6Q
} }K':tX?
} z*n
r@b M3V_o
void CCaptureDlg::OnPaint() 3D32'KO_"
{ & mwQj<Z
if (IsIconic()) N^</:R
{ 5x856RQ'
CPaintDC dc(this); // device context for painting nwuH:6~"
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); eB%hP9=:x
// Center icon in client rectangle XrP'FLY o
int cxIcon = GetSystemMetrics(SM_CXICON); 8T<LNC
int cyIcon = GetSystemMetrics(SM_CYICON); ;w>Dqem
CRect rect; vP6NIcWC3
GetClientRect(&rect); t|-TG\Q X
int x = (rect.Width() - cxIcon + 1) / 2; t6u>_She
int y = (rect.Height() - cyIcon + 1) / 2; ;e
Iqxe>
// Draw the icon `o/G0~T)
dc.DrawIcon(x, y, m_hIcon); &O8vI,M
} riw0w
else 7q\&
{ RP[^1
CDialog::OnPaint(); :{sy2g/+
} c=d` DJ
} $d0xJxM
WXHvUiFf
HCURSOR CCaptureDlg::OnQueryDragIcon() LX f r
{ U}f"a!
return (HCURSOR) m_hIcon; DBTeV-G9~R
} OM,Dy&Y
h0**[LDH
void CCaptureDlg::OnCancel() [0c7fH`8V
{ wHx@&Tp
if(bTray) 5rp,xk!
DeleteIcon(); ,~8&0p
CDialog::OnCancel(); c{.y9P6
} ByyvRc,v
?e=3G4N
void CCaptureDlg::OnAbout() oF'_x,0
{ pQ~Y7
CAboutDlg dlg; @S?`!=M
dlg.DoModal(); Pgug!![
} `U4e]Qh/+
{7d(B1[1
void CCaptureDlg::OnBrowse() B:mtl?69g
{ om_UQgC@r
CString str; h]6m+oPW
BROWSEINFO bi; j(aok5:e
char name[MAX_PATH]; e^!>W %.7Z
ZeroMemory(&bi,sizeof(BROWSEINFO)); uwI$t[
bi.hwndOwner=GetSafeHwnd(); s!73To}>
bi.pszDisplayName=name; Z7]["
bi.lpszTitle="Select folder"; M=rH*w{^
bi.ulFlags=BIF_RETURNONLYFSDIRS; <n4?wo
LPITEMIDLIST idl=SHBrowseForFolder(&bi); OQnb^fabY
if(idl==NULL) MZIZ"b
return; #(pY~\
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ATRB9
str.ReleaseBuffer(); wWYo\WH'
m_Path=str; gh9Gc1tKt
if(str.GetAt(str.GetLength()-1)!='\\') Pzt5'O@dA
m_Path+="\\";
cG)U01/"
UpdateData(FALSE); C>NLZMT
} F)8M9%g5m
s2=`haYu
void CCaptureDlg::SaveBmp() 9 AWFjoXl"
{ 4De2miq
CDC dc; $I0&I[_LzK
dc.CreateDC("DISPLAY",NULL,NULL,NULL);
M4H~]Ftn
CBitmap bm; r;n^\[Ov0,
int Width=GetSystemMetrics(SM_CXSCREEN); :<p3L!?8y
int Height=GetSystemMetrics(SM_CYSCREEN); 1S{AGgls5
bm.CreateCompatibleBitmap(&dc,Width,Height); 62.)fCQ^
CDC tdc; )#os!Ns_A
tdc.CreateCompatibleDC(&dc); tl6x@%\
CBitmap*pOld=tdc.SelectObject(&bm); x@*RF:\}
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ;9MIapfUd(
tdc.SelectObject(pOld); tD^$}u6
BITMAP btm; ,DL%oQR
bm.GetBitmap(&btm);
Cl>|*h+m
DWORD size=btm.bmWidthBytes*btm.bmHeight; ZrNBkfe:
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); qV{iUtYt
BITMAPINFOHEADER bih; F:~k4uTW\b
bih.biBitCount=btm.bmBitsPixel; ]]Fe:>
bih.biClrImportant=0; GI5#{-)
bih.biClrUsed=0; R$m?aIN
bih.biCompression=0; |S6L[Uo
bih.biHeight=btm.bmHeight; j^5VmG
bih.biPlanes=1; byJR6f
bih.biSize=sizeof(BITMAPINFOHEADER); mYx6JU*`
bih.biSizeImage=size; OC6v%@xa
bih.biWidth=btm.bmWidth; uqHI/4
bih.biXPelsPerMeter=0; 0<[g7BbR
bih.biYPelsPerMeter=0; vJ?j#Ch
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); r91b]m3xL
static int filecount=0; [gaB}aLn
CString name; j&-<e7O=
name.Format("pict%04d.bmp",filecount++); )NLjv=ql
name=m_Path+name; P.
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BITMAPFILEHEADER bfh; bZ SaL^^(
bfh.bfReserved1=bfh.bfReserved2=0; ugV/#v O
bfh.bfType=((WORD)('M'<< 8)|'B'); o}b_`O
bfh.bfSize=54+size; WSxE/C|[
bfh.bfOffBits=54; 6s.>5}M!
CFile bf; 7`J= PG$A
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ^aI$97Li
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 45 B
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bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); itmFZZh
bf.WriteHuge(lpData,size); wiP )"g.t
bf.Close(); "'3QKeM1
nCount++; ' e:rL.
} $!goM~pZ
GlobalFreePtr(lpData); !d
Z:Ih.[{
if(nCount==1) [R0E4A?M
m_Number.Format("%d picture captured.",nCount); <4:%M
else q[TGEgG
m_Number.Format("%d pictures captured.",nCount); D KRF#*[=d
UpdateData(FALSE); (zml704dI)
} TCI)L}L|
' OXL'_Xl
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) OrY^ ?E
{ %CV.xDE8
if(pMsg -> message == WM_KEYDOWN) K''2Jfm
{ duV\Kt/g^
if(pMsg -> wParam == VK_ESCAPE) 4?33t] "
return TRUE; HSj=g}r
if(pMsg -> wParam == VK_RETURN) DQ.; 2W
return TRUE; zP8rW5/
}
:>-&
return CDialog::PreTranslateMessage(pMsg); 7-Mm+4O9
} }B`T%(11=
!B/5@P
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) MLvd6tIv,
{ kYZj^tR
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ +>QD4z#
SaveBmp(); 19;Pjo8
return FALSE; ==npFjB
} ('6sW/F*ab
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ H;N6X y*~
CMenu pop; =X3Rk)2r
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); |"+UCAU
CMenu*pMenu=pop.GetSubMenu(0); CwaW>(`v
pMenu->SetDefaultItem(ID_EXITICON); u=
Vt3%q
CPoint pt; o(stXa
GetCursorPos(&pt); J+u z{
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); gaU(ebsE
if(id==ID_EXITICON) iE#I^`^V
DeleteIcon(); u>*d^[zS
else if(id==ID_EXIT) %9OVw#P
OnCancel(); Ay|K>8z
return FALSE; ]$)U~)T
iW
} =gAn;~
LRESULT res= CDialog::WindowProc(message, wParam, lParam); dmYgv^t
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Z#zXary5s
AddIcon(); 5}4>vEn
return res; 85rjM#~
} vAqVs5 j
\ZtF,`Z
void CCaptureDlg::AddIcon() ?t [C?{'
{ i:2eJ.
NOTIFYICONDATA data; @r/f
data.cbSize=sizeof(NOTIFYICONDATA); cuQAXqXC@
CString tip; lZJbQ=K{
tip.LoadString(IDS_ICONTIP); ^=ar Kp,?5
data.hIcon=GetIcon(0); M)G|K a
data.hWnd=GetSafeHwnd(); &~"e["gF=
strcpy(data.szTip,tip); c JOT{
data.uCallbackMessage=IDM_SHELL; ,HwOMoP7
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; '8c-V aa
data.uID=98; X< 4f7;]O
Shell_NotifyIcon(NIM_ADD,&data); tY- `$U@
ShowWindow(SW_HIDE); aucG|}B
bTray=TRUE; &Fh#o t H_
} >JHQA1mX
)\+1*R|H}
void CCaptureDlg::DeleteIcon() "H|hN
{ lNx:_g:SrZ
NOTIFYICONDATA data; *n_7~ZX
data.cbSize=sizeof(NOTIFYICONDATA); |W*i'E
data.hWnd=GetSafeHwnd(); Vi>`g{\
data.uID=98; <KrfM
Shell_NotifyIcon(NIM_DELETE,&data); b,lIndj#
ShowWindow(SW_SHOW); 8F/JOtkGMt
SetForegroundWindow(); 64l(ru<
ShowWindow(SW_SHOWNORMAL); ;uaZp.<um&
bTray=FALSE; 2}6StmE }
} ^q\9HBHT
K?6#jT6#
void CCaptureDlg::OnChange() ]O0:0Z\
{ @i(;}rx
RegisterHotkey(); kqZ+e/o>O9
} ~IQw?a.E
ZDr&Alp)o
BOOL CCaptureDlg::RegisterHotkey() K9c5HuGy
{ bj_oA
i
UpdateData(); 6tN!]
UCHAR mask=0; QygbfW6u
UCHAR key=0; +K:hetv
if(m_bControl) 'Omj-o'tn9
mask|=4; 6Gh3r
if(m_bAlt) >?(}F':
mask|=2; :,Mg1Zf
if(m_bShift) dPmNX-'7
mask|=1; Lz=GA?lk[\
key=Key_Table[m_Key.GetCurSel()]; j'q Iq;y
if(bRegistered){ 7i88iT
DeleteHotkey(GetSafeHwnd(),cKey,cMask); Q6hWHfS
bRegistered=FALSE; dReJ;x4
} L)3JTNiB
cMask=mask; b2XUZ5
cKey=key; GI)eq:K_U8
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); frUO+
return bRegistered; TSUT3'&~p
} +t*Ks_V,*
z<,-:=BC"
四、小结 Qw.j
uolEX+
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。