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:
ed:@C?
m+#iR}*1L 一、实现方法
G 2mX; glDh([ 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:
MW PvR|Q T}4/0yR2 #pragma data_seg("shareddata")
F35#dIs`& HHOOK hHook =NULL; //钩子句柄
2^)1N>"g UINT nHookCount =0; //挂接的程序数目
ZeEWp3vW static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
^;Sy. W&` static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
z^GDJddG static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
vmLxkjUm# static int KeyCount =0;
H6&J;yT} static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
5ux`U{`m #pragma data_seg()
me'd6!O9- x3u4v~ "- 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。
XXh6^@H= KX}Rr7a 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:
RKPD4e>% h68]=KyK BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
-CRQp1] cKey,UCHAR cMask)
gq"gUaz {
Y;)dct BOOL bAdded=FALSE;
Dc+'<" for(int index=0;index<MAX_KEY;index++){
<a[Yk 2 if(hCallWnd[index]==0){
P|HKn,ar hCallWnd[index]=hWnd;
i,|0@Vy HotKey[index]=cKey;
OQ,NOiNkap HotKeyMask[index]=cMask;
?_v{|
YI= bAdded=TRUE;
V13BB44 KeyCount++;
**+e7k break;
BbRBT@ }
Q6XRsFc }
a&k_=/X& return bAdded;
lt_']QqU }
XfKo A0 //删除热键
V~
TWKuR BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
jZ%TJ0(H {
\tRG1&{$% BOOL bRemoved=FALSE;
e#B#B for(int index=0;index<MAX_KEY;index++){
rvyrxw%[ if(hCallWnd[index]==hWnd){
NNF>Xa`9, if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
e{KByFl hCallWnd[index]=NULL;
_ z;q9&J) HotKey[index]=0;
-_<}$9lz HotKeyMask[index]=0;
|Xw/E)jA bRemoved=TRUE;
'}rRzD: KeyCount--;
t#S<iBAZ break;
ay
%KE=*v }
1-PoZ[p-R }
$-c!W!H }
n=,\;3Y= return bRemoved;
!sRngXCXk? }
~l$3uN[g IJJ%$%F/ ncSFj.}w] DLL中的钩子函数如下:
u-1;'a ^{\<N()R LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
(708H_ {
c)Ic#<e( BOOL bProcessed=FALSE;
DaH?@Q if(HC_ACTION==nCode)
gZEi]/8_ {
5"/J^"!h if((lParam&0xc0000000)==0xc0000000){// 有键松开
Lgz$]Jbl8 switch(wParam)
2jbIW* {
$46{<4. case VK_MENU:
-!)xQvagD. MaskBits&=~ALTBIT;
x)UwV break;
!J=sk4T case VK_CONTROL:
)I\=BPo|B MaskBits&=~CTRLBIT;
a,o_`s< break;
{,cCEXag% case VK_SHIFT:
k/03ZxC- MaskBits&=~SHIFTBIT;
jt@SZI` break;
#eN{!Niy&U default: //judge the key and send message
)9S>ZZF break;
}@+NN
?P }
q\rC5gk> for(int index=0;index<MAX_KEY;index++){
#XnPsU<J if(hCallWnd[index]==NULL)
$o +5/c?| continue;
!;Jmg if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
BI:k#jO! {
*0_yT$ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
w0ZLcND{ bProcessed=TRUE;
zyg:nKQW }
m>}8'N) }
f,z P* }
SSBg?H 'T else if((lParam&0xc000ffff)==1){ //有键按下
JxjI]SF02 switch(wParam)
~O 3D[PNW~ {
xvNo(> case VK_MENU:
f/kI|Z MaskBits|=ALTBIT;
\*\R1_+ break;
Gd+ET case VK_CONTROL:
1shBY@mlq MaskBits|=CTRLBIT;
WU4U Zpz break;
\ j.x0/; case VK_SHIFT:
S?{/hy MaskBits|=SHIFTBIT;
hCYQGx0 break;
E(Rh#+]Y5 default: //judge the key and send message
=&dW(uyzY break;
7DKz;o }
Kd3?I5t for(int index=0;index<MAX_KEY;index++){
0Y]0!} if(hCallWnd[index]==NULL)
B$ KwkhMe continue;
~dHM4lGY if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
|BZDhd9<{ {
WS2osBc SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
^Cv^yTj;& bProcessed=TRUE;
]l~Vi_c }
O8U<{jgAG }
!TAp+b }
as+GbstN if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
$3X-rjQtW for(int index=0;index<MAX_KEY;index++){
O|cu.u| if(hCallWnd[index]==NULL)
%~NH0oFO continue;
ZAuWx@} if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
Zc"B0_&?:7 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
Q/I)V2a1i //lParam的意义可看MSDN中WM_KEYDOWN部分
nH !3(X* }
$ XBAZ<"hd }
}%TSGC4{ }
U"f??y%) return CallNextHookEx( hHook, nCode, wParam, lParam );
fQnwy!-\ }
sP'0Sl~NU 1\L[i];L8 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:
(x;g/!: mgZf3?,) BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
Q6C-4ja BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
kHc<* L_V %OcGdbs 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:
Oq(VvS/
he+#Q6 LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
_kFYBd {
l_/C65%.: if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
qJR!$? {
iO1nwl !# //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
aH_6s4+: SaveBmp();
hbOnlj4 return FALSE;
rAdacnZV }
Gi^Ha=?J% …… //其它处理及默认处理
.wrL3z_ }
$\a5&1rl T:asm1BC[ 17g^ALs 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。
1;eX& Cup@TET35 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。
t>UkE9=3\ tGcya0RL 二、编程步骤
%qsvtc` Zs zs1{t 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";
(y4#.vZh: 2_QN&o ~h 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
d6 _C"r h7_)%U<J2 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;
K_-d( *HM?YhR 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;
,je`YEC P}3}ek1Ax 5、 添加代码,编译运行程序。
GgFi9Ffj T&"i _no* 三、程序代码
;eB ~H[S/ 9vGs; ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
mjnUs-`W| #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
HO|-@yOF^ #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
xcCl
(M]+ #if _MSC_VER > 1000
I12KT~z<r #pragma once
{#Q\z> #endif // _MSC_VER > 1000
farDaS[\VY #ifndef __AFXWIN_H__
://U^sFL #error include 'stdafx.h' before including this file for PCH
+zOOdSFk. #endif
zxZtz #include "resource.h" // main symbols
q<=:
>? class CHookApp : public CWinApp
Xwu.AVsr {
D>T],3U(H public:
`m%dX'0E CHookApp();
GSVdb/+ // Overrides
`QP
~ // ClassWizard generated virtual function overrides
Z&yaSB //{{AFX_VIRTUAL(CHookApp)
V`a+Hi<P\ public:
2C+(":=} virtual BOOL InitInstance();
OjnJV virtual int ExitInstance();
R 4EEelSZu //}}AFX_VIRTUAL
uf) Oy7FQ //{{AFX_MSG(CHookApp)
GaNq2 G // NOTE - the ClassWizard will add and remove member functions here.
h%#_~IA:| // DO NOT EDIT what you see in these blocks of generated code !
4,eQW[;kk //}}AFX_MSG
_ptP[SV^j DECLARE_MESSAGE_MAP()
u"VS* hSH };
K!8zwb=fq LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
?p8Qx\%* BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
Ns~&sE: BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
(RF>s.B< BOOL InitHotkey();
!)H*r|*[ BOOL UnInit();
'?/&n8J\ #endif
,=w!vO5s m^Lj+=Z" //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
6517Km 4- #include "stdafx.h"
M[Y4_$k<- #include "hook.h"
<4?*$ #include <windowsx.h>
} ~enEZ #ifdef _DEBUG
%JoxYy- #define new DEBUG_NEW
6nw&$I #undef THIS_FILE
,a(O`##Bn static char THIS_FILE[] = __FILE__;
jq oPLbxT #endif
m3
IP7h' #define MAX_KEY 100
!QC<n/ #define CTRLBIT 0x04
u35q,u=I #define ALTBIT 0x02
b&t[S[P.V #define SHIFTBIT 0x01
}ymvC #pragma data_seg("shareddata")
#Q6w+" HHOOK hHook =NULL;
=Lw3
\5l UINT nHookCount =0;
3XVk#)lw static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
E3\ZJjG static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
ua& @GXvZ static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
U}P,EP%p static int KeyCount =0;
~w.2-D static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
{OxWcK\2@h #pragma data_seg()
C6k4g75U2 HINSTANCE hins;
?n*fy void VerifyWindow();
i!~>\r\6\ BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
8 lS($@@{ //{{AFX_MSG_MAP(CHookApp)
{rGYRn, // NOTE - the ClassWizard will add and remove mapping macros here.
T^)plWw // DO NOT EDIT what you see in these blocks of generated code!
Xem| o& //}}AFX_MSG_MAP
i:Mc(mW END_MESSAGE_MAP()
lBiovT ep?:;98|t CHookApp::CHookApp()
S %+R#A1 {
t"YIq/08 // TODO: add construction code here,
d^aNR
Lv // Place all significant initialization in InitInstance
Y+|PY?
~ }
0BC`iql5 zzf7S%1I CHookApp theApp;
swZpWC LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
5#u.pu {
3X'WR] BOOL bProcessed=FALSE;
eY3=|RR if(HC_ACTION==nCode)
|!b9b(_j9 {
?M"HXu if((lParam&0xc0000000)==0xc0000000){// Key up
IQ{?_' switch(wParam)
UX}*X`{ {
3}4#I_<$F@ case VK_MENU:
@&:VKpu\ MaskBits&=~ALTBIT;
uX0
Bp8P break;
d^SE)/j case VK_CONTROL:
Qp 69Sk@H{ MaskBits&=~CTRLBIT;
Y\8+}g;KR break;
SKxe3
case VK_SHIFT:
/+P5)q
TKL MaskBits&=~SHIFTBIT;
hO;9Y|y break;
`@\^m_!} default: //judge the key and send message
{,v:
GMsm break;
8nu> gA }
@W)/\AZ3 for(int index=0;index<MAX_KEY;index++){
OX)BP.h# if(hCallWnd[index]==NULL)
"yri[X continue;
TolrEcI if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
9Z9l:}bO {
.\4l'THn,0 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
K{FhT9R' bProcessed=TRUE;
Z!)f* }
rIPl6,w~ }
`r.N }
?d,M.o{0] else if((lParam&0xc000ffff)==1){ //Key down
5ZUy: switch(wParam)
65"uD7; {
J" wKR y case VK_MENU:
{e6KJ@H6 MaskBits|=ALTBIT;
%#4 +! break;
0%;MVMH case VK_CONTROL:
W^|J/Y48 MaskBits|=CTRLBIT;
#XL`S break;
a^/K?lAB8 case VK_SHIFT:
TMtI^mkB: MaskBits|=SHIFTBIT;
LO}z)j~W break;
4]u,x`6C default: //judge the key and send message
w=$'Lt! break;
JP_kQ }
q-uLA&4 for(int index=0;index<MAX_KEY;index++)
#-dK0<: {
UhA_1A'B if(hCallWnd[index]==NULL)
ul$omKI$} continue;
.]zw*t* if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
xx6S`R6: {
$$~a=q,P[ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
1!s!wQgS bProcessed=TRUE;
&$Ci}{{n# }
-PXoMZx% }
7A[Ogro }
$%;jk if(!bProcessed){
Wa{%0inZ for(int index=0;index<MAX_KEY;index++){
\086O9 if(hCallWnd[index]==NULL)
Ir>2sTrm continue;
z^9E; if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
VX&WlG`wa SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
l"?]BC~ }
E6JV}`hSk }
[nC4/V+- }
$&Ac5Zo%} return CallNextHookEx( hHook, nCode, wParam, lParam );
`M6YblnJZ }
1zR/HT ac3_L$X[ BOOL InitHotkey()
2gH_$ {
AW62~* if(hHook!=NULL){
mMslWe nHookCount++;
?}v}U^ return TRUE;
J[MVE4& }
.c|9..Cq= else
N@}gLBf hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
]p}#NPe5 if(hHook!=NULL)
AO^]>/7ed nHookCount++;
oM2|]ew) return (hHook!=NULL);
*n;>p_# }
` )]lUvR BOOL UnInit()
tz3]le|ml {
QWQ!Ak if(nHookCount>1){
WySNL#>a nHookCount--;
4xp j< return TRUE;
h9U+%=^O }
H[Cj7{V BOOL unhooked = UnhookWindowsHookEx(hHook);
3 ^pYCK% if(unhooked==TRUE){
=J`gGDhGY- nHookCount=0;
s v6INe: hHook=NULL;
.dt#2a_5q }
d~3GV(M return unhooked;
XS3{R }
V15q01bE# # UjEY9"M BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
.byc;9M% {
[:Xn6)qz BOOL bAdded=FALSE;
` v>/
for(int index=0;index<MAX_KEY;index++){
eC.w?(RB if(hCallWnd[index]==0){
i>WOYI9 hCallWnd[index]=hWnd;
0}6QO HotKey[index]=cKey;
J/L)3y HotKeyMask[index]=cMask;
+&(Jn bAdded=TRUE;
<Ak:8&$O KeyCount++;
\3L$I-]m break;
iY}QgB< M }
|^>u<E5 }
IC\E,m return bAdded;
V;P1nL4L }
"Jf4N .fbYB,0w BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
l'W3=,G[? {
k:`a+LiZ BOOL bRemoved=FALSE;
8u/3?Kc for(int index=0;index<MAX_KEY;index++){
LPb]mC6# if(hCallWnd[index]==hWnd){
j1W
bD7*8 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
33O)k*g hCallWnd[index]=NULL;
@Ap@m6K?q HotKey[index]=0;
+yt 6.L HotKeyMask[index]=0;
7xz#D4[ bRemoved=TRUE;
|}:e+?{o KeyCount--;
y Y'gx|\ break;
pb~Ps#"Zg }
Pkj T&e) }
-6(h@F%E }
5sG ]3z+1 return bRemoved;
]aREQ?ma&z }
*X%?3"WH8 sV]i/B void VerifyWindow()
@wg&6uQ {
Y"r3i] for(int i=0;i<MAX_KEY;i++){
58qaA\iw if(hCallWnd
!=NULL){ o-L|"3P
if(!IsWindow(hCallWnd)){ ^ b=5 6~[
hCallWnd=NULL; EPQ&?[6
HotKey=0; M4R%Gr,La
HotKeyMask=0; M0Lon/%
KeyCount--; X *_
SHt
} :8GlyN<E
} E=$7ieW
} 8[vl3C
} I:r($m
9NJ=~Ub-
BOOL CHookApp::InitInstance() ?aP1
{
Iz 1*4@
AFX_MANAGE_STATE(AfxGetStaticModuleState()); HJnv'^yn
hins=AfxGetInstanceHandle(); '2;Ny23
InitHotkey(); $0S.@wUG
return CWinApp::InitInstance(); e{c._zr,
} mvUVy1-c
@hE7r-}]
int CHookApp::ExitInstance() kxcgOjrmI
{ E!:.G+SEl
VerifyWindow(); #-l!`\@
UnInit(); `HE>%=]b
return CWinApp::ExitInstance(); jB}_Slh1j
} :_W0Af09
gvow\9{|C
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 9{auleu
R
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) B iVd
ka
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ =e"H1^Ml
#if _MSC_VER > 1000 ZE5-i@1
#pragma once CUAg{]
#endif // _MSC_VER > 1000 }dV9%0s!
Dx9$H++6$X
class CCaptureDlg : public CDialog EKeBTb
{ 3 C E 39W
// Construction F]dmc,Q
public: UXcH";*9b
BOOL bTray; >[A65q'
BOOL bRegistered; Om &{4a\
BOOL RegisterHotkey(); dVY(V&p
UCHAR cKey; Q'
OuZKhA
UCHAR cMask; RZcx4fL}x
void DeleteIcon(); T%N~oa
void AddIcon(); \@iOnRuHn9
UINT nCount; [|c@Yw
void SaveBmp(); j]cXLY
CCaptureDlg(CWnd* pParent = NULL); // standard constructor A8A:@-e8A
// Dialog Data
KT]J,b
//{{AFX_DATA(CCaptureDlg) H| eD/6K
enum { IDD = IDD_CAPTURE_DIALOG }; '<*CD_2t-
CComboBox m_Key; .:#_5K
BOOL m_bControl; C[Y%=\6'0
BOOL m_bAlt; \4]zNV ~x
BOOL m_bShift; &r5&6p
CString m_Path;
/)eNx
CString m_Number; B.C H9M
//}}AFX_DATA YUP%K!k
// ClassWizard generated virtual function overrides i-Ge*?
//{{AFX_VIRTUAL(CCaptureDlg) (50[,:#
public: /ej/&x15
virtual BOOL PreTranslateMessage(MSG* pMsg); URmAI8fq*M
protected: khKv5K#)
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support cq@_*:~Or
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 3.K{T
//}}AFX_VIRTUAL Lk8W&|;0|
// Implementation v"G%5pq*\
protected: ?
bUpK
HICON m_hIcon; ]%WD} 4e
// Generated message map functions auyKLT3C
//{{AFX_MSG(CCaptureDlg) ?-RoqF
virtual BOOL OnInitDialog(); 1OfSq1G>v$
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); c:`` Y:
afx_msg void OnPaint(); B~'VDOG$Z
afx_msg HCURSOR OnQueryDragIcon(); yP1Y3Tga=
virtual void OnCancel(); ~t.WwxY+
afx_msg void OnAbout(); /I`bh
afx_msg void OnBrowse(); 'Z(MV&
afx_msg void OnChange(); )$Dcrrj
//}}AFX_MSG N c&i) qh
DECLARE_MESSAGE_MAP() y. ivz
}; &?5{z\;1"
#endif 6S&=OK^
9wDBC~.
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file u]>>B>KOJ7
#include "stdafx.h" :<WQ;q
#include "Capture.h" I!soV0VU]
#include "CaptureDlg.h" b[&,%Sm+6
#include <windowsx.h> BC$;b>IUA
#pragma comment(lib,"hook.lib") &ttv4BC^r
#ifdef _DEBUG ^!v}
#define new DEBUG_NEW [Q.4]K2
#undef THIS_FILE a|6x!p2X
static char THIS_FILE[] = __FILE__; Te U7W?M^
#endif %M0mwty]
#define IDM_SHELL WM_USER+1 YKX>@)Dxv
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Wc`J`.#
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); =|WV^0=S'%
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 3A}nNHpN
class CAboutDlg : public CDialog j~,LoGuPh
{ EZwdx
public: f2w=ln
CAboutDlg(); +~i+k~{`H
// Dialog Data 0:B^
//{{AFX_DATA(CAboutDlg) mrLx]og,
enum { IDD = IDD_ABOUTBOX }; 057G;u/
//}}AFX_DATA
8.;';[
// ClassWizard generated virtual function overrides P9tQS"Rs
//{{AFX_VIRTUAL(CAboutDlg) VM V]TPks>
protected: mB|mt+
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support M_e$l`"G
//}}AFX_VIRTUAL *|gs-<[#X
// Implementation u6S0t?Udap
protected: 4htSwK+
//{{AFX_MSG(CAboutDlg) ==jw3_W
//}}AFX_MSG &8_#hne_
DECLARE_MESSAGE_MAP() R{OE{8;
};
;~gd<KK
cf[u%{
6Y
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) $ DZQdhv
{ TXh@
//{{AFX_DATA_INIT(CAboutDlg) b]g&rwXYt
//}}AFX_DATA_INIT t+4Y3*WeGF
} (HrkUkw
N5 rG.6K
void CAboutDlg::DoDataExchange(CDataExchange* pDX) i\Q"a B"r
{ c]>&6-;rf
CDialog::DoDataExchange(pDX); h@m n
GE
//{{AFX_DATA_MAP(CAboutDlg) }fZ=T4r
//}}AFX_DATA_MAP moJT8tb
} y'2kV6TtqD
M6hvi(!X2
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) vb"dX0)<
//{{AFX_MSG_MAP(CAboutDlg) /4B4IT
// No message handlers N7I71q|
//}}AFX_MSG_MAP j_a~)o-p
END_MESSAGE_MAP() 6 XOu~+7
9M7(_E;)B
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) t{S{!SF4
: CDialog(CCaptureDlg::IDD, pParent)
$Z%aGc*
{ M}oFn}-T9a
//{{AFX_DATA_INIT(CCaptureDlg) gM5p1?E
m_bControl = FALSE; >pH775I=
m_bAlt = FALSE; !{ESeBSCG
m_bShift = FALSE; gy,TT<1)
m_Path = _T("c:\\"); Ualq>J5-m-
m_Number = _T("0 picture captured."); yDkDtO`K
nCount=0; 61rh\<bn
bRegistered=FALSE; *"QE1Fum'
bTray=FALSE; >5@vY?QXO
//}}AFX_DATA_INIT })0 7u
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 PSQ:'
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); `)C`_g3Ew
} Y\z\{JW
cV_IG}LJ
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) o(>-:l i0
{ JTh=JHJ
CDialog::DoDataExchange(pDX); z vylL
M
//{{AFX_DATA_MAP(CCaptureDlg) U1HD~
DDX_Control(pDX, IDC_KEY, m_Key); C94UF7al
DDX_Check(pDX, IDC_CONTROL, m_bControl); hHl-;%#
DDX_Check(pDX, IDC_ALT, m_bAlt); #HuA(``[d
DDX_Check(pDX, IDC_SHIFT, m_bShift); O"^a.`27
DDX_Text(pDX, IDC_PATH, m_Path); &P{p\ v2Y
DDX_Text(pDX, IDC_NUMBER, m_Number); BSu)O~s
//}}AFX_DATA_MAP +l?ro[#6&.
} 73z|'0.
vwH7/+
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) .q9|XDqQc
//{{AFX_MSG_MAP(CCaptureDlg) $E,DxDT
ON_WM_SYSCOMMAND() ic]tUOC :
ON_WM_PAINT() :0j`yo:w
ON_WM_QUERYDRAGICON() //5_E7Ehu$
ON_BN_CLICKED(ID_ABOUT, OnAbout) w$;*~Qc
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) r=H\4%P4
ON_BN_CLICKED(ID_CHANGE, OnChange) P "_}F
//}}AFX_MSG_MAP L%O8vn^3
END_MESSAGE_MAP() Fx99"3`3
n25tr'=
BOOL CCaptureDlg::OnInitDialog() JX0_UU
{ 9"lW"lG!
CDialog::OnInitDialog(); i[\u-TF
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); S@G{|. )2
ASSERT(IDM_ABOUTBOX < 0xF000); U8$dG)PhA
CMenu* pSysMenu = GetSystemMenu(FALSE); U6'haPlOk%
if (pSysMenu != NULL) No&[ \;
{ ApJf4D<V
CString strAboutMenu; xOyL2
strAboutMenu.LoadString(IDS_ABOUTBOX); P5xmLefng
if (!strAboutMenu.IsEmpty()) wYMX1=
{ jzA8f+:q
pSysMenu->AppendMenu(MF_SEPARATOR); ^RAFmM#F
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
.QQI~p0:
} t{s*3k/
} UG'U
D"
SetIcon(m_hIcon, TRUE); // Set big icon /N{@g.edL
SetIcon(m_hIcon, FALSE); // Set small icon <IDzv'
m_Key.SetCurSel(0); S=amj cC
RegisterHotkey(); |j}F$*SE[
CMenu* pMenu=GetSystemMenu(FALSE); J$/BH\
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); wBHDof
xX
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); [gdPHXs
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Ml/p{ *p
return TRUE; // return TRUE unless you set the focus to a control J+NK+,_*M
} Ry S{@=si
@d^h/w
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) gI5nWEM0{
{ Q!e0Vb
if ((nID & 0xFFF0) == IDM_ABOUTBOX) 49fq6ZhO
{ C$ `Y[w
CAboutDlg dlgAbout; &FF. Ddt{
dlgAbout.DoModal(); ?[B[ F
} 2\tjeg
else htrj3$q(4
{ ;/q6^Nk3A
CDialog::OnSysCommand(nID, lParam); vl~
} `srZ#F5
} .);:K
O:p649A
void CCaptureDlg::OnPaint() dTQvz9 C
{ A":b_!sW
if (IsIconic()) P2JRsZ.
{ j4r,_lH^r
CPaintDC dc(this); // device context for painting -86:PL(I"
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); FF!g9>
// Center icon in client rectangle qML*Kwg
int cxIcon = GetSystemMetrics(SM_CXICON); .%Q Ea_\
int cyIcon = GetSystemMetrics(SM_CYICON); Z2jb>%
CRect rect; `80Hxp@
GetClientRect(&rect); aB!Am +g
int x = (rect.Width() - cxIcon + 1) / 2; Z|S7",
int y = (rect.Height() - cyIcon + 1) / 2; }z-
// Draw the icon BIf].RY
dc.DrawIcon(x, y, m_hIcon); j$oZIV7
} emPm^M5/K
else +##I4vP
{ NB+O;
CDialog::OnPaint(); 2vQ^519
} $QBUnLOek&
} z35Rjhj9
$-fY 8V3[
HCURSOR CCaptureDlg::OnQueryDragIcon() 1 ZFSz{
{ "q/M8
return (HCURSOR) m_hIcon; AV3,4u
} :Ia&,;Gc
M
F: Eu
void CCaptureDlg::OnCancel() 0w. _}Cz
{ aW$nNUVD
if(bTray) Z x%@wH~
DeleteIcon(); fr2w k}/b
CDialog::OnCancel(); (#M$t!'%
} JW'acD
hP<qK Vy
void CCaptureDlg::OnAbout() Q 9<_:3
{ >D62l*V C)
CAboutDlg dlg; 1tz .e\
dlg.DoModal(); i]?xM2(N
} :ygz/L
"]Td^Nxi
void CCaptureDlg::OnBrowse() H H3
{ >{Z=cv/6o
CString str; ZhaOH5{9
BROWSEINFO bi; j!7Uj]
char name[MAX_PATH]; }8#Czo jt
ZeroMemory(&bi,sizeof(BROWSEINFO)); w/6@R 4)p
bi.hwndOwner=GetSafeHwnd(); hAyPaS #
bi.pszDisplayName=name; lIP<`6=4
bi.lpszTitle="Select folder"; IuW10}"9
bi.ulFlags=BIF_RETURNONLYFSDIRS; (SA*9%
LPITEMIDLIST idl=SHBrowseForFolder(&bi); L]<4{8H.
if(idl==NULL) TJ:Lz]l >
return; {hR2NUm
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); lXKZNCL
str.ReleaseBuffer(); #K w\r50
m_Path=str; V7_??L%Ct`
if(str.GetAt(str.GetLength()-1)!='\\') ;g]+MLV9
m_Path+="\\"; r^^C9"
UpdateData(FALSE); 1Di&vpn0u
} uK5x[m
oH"N>@ Vl
void CCaptureDlg::SaveBmp() 0+pJv0u
{ .9Fm>e+!C
CDC dc; ZE`{J=,
dc.CreateDC("DISPLAY",NULL,NULL,NULL); c iX2G
CBitmap bm; =
g}yA=.
int Width=GetSystemMetrics(SM_CXSCREEN); =LnAMl#9
int Height=GetSystemMetrics(SM_CYSCREEN); ]]3D`
F}
bm.CreateCompatibleBitmap(&dc,Width,Height); -1JHhRr]
CDC tdc; u`|fmVI
tdc.CreateCompatibleDC(&dc); \]%U?`A
CBitmap*pOld=tdc.SelectObject(&bm); Y&:i^k
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 5K{h)* *5
tdc.SelectObject(pOld); OhEL9"\<
BITMAP btm; EdpR| z
bm.GetBitmap(&btm); 1PSb72h<
DWORD size=btm.bmWidthBytes*btm.bmHeight; Y\sjm]_
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); S
&u94hlC
BITMAPINFOHEADER bih; m.1BLN[9
bih.biBitCount=btm.bmBitsPixel; i>2_hn_UR
bih.biClrImportant=0; e,8-P-h~T
bih.biClrUsed=0; cC.DBYV+-
bih.biCompression=0; R0}%
bih.biHeight=btm.bmHeight; sXu+F2O
bih.biPlanes=1; I&Y(]S,cU
bih.biSize=sizeof(BITMAPINFOHEADER); aa/9o]
bih.biSizeImage=size; nT"z(\i.!J
bih.biWidth=btm.bmWidth; {+Yo&F}n
bih.biXPelsPerMeter=0; h[T3WE
bih.biYPelsPerMeter=0; |e&Kg~~C
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); EA.U>5Fq
static int filecount=0; &=bI3-
CString name; 2-84
name.Format("pict%04d.bmp",filecount++); zhE7+``g
name=m_Path+name; J~.kb k
BITMAPFILEHEADER bfh; mN02T@R-
bfh.bfReserved1=bfh.bfReserved2=0; 6! 'Xo:p
bfh.bfType=((WORD)('M'<< 8)|'B'); e$=|-Jz
bfh.bfSize=54+size; Sdp1h0E}7=
bfh.bfOffBits=54; {'!~j!1'j
CFile bf; 46~ug5gV
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ r$5!KO
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 51x,[y+Xe
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); :cTi$n
bf.WriteHuge(lpData,size); qv\yQ&pj
bf.Close(); v*3:8Y,
nCount++; wn`budH?c8
} O5
SX"A
GlobalFreePtr(lpData); ?*,q#ZkA9W
if(nCount==1) ^MUM04l
m_Number.Format("%d picture captured.",nCount); :%{7Q$Xv<
else z/b*]"g,
m_Number.Format("%d pictures captured.",nCount); 4<|u~n*JF
UpdateData(FALSE); {SV$fl;
} zdCt#=QV?R
Za w+
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) X!Q"p$D4(
{ h 8s*FI
if(pMsg -> message == WM_KEYDOWN) u2QJDLMJv
{ J++D\x#@
if(pMsg -> wParam == VK_ESCAPE) )Pq.kn{Sp
return TRUE; K4BMa]/U
if(pMsg -> wParam == VK_RETURN) S[M$>
return TRUE; \X!!(Z;6A
} 0W> ",2|z
return CDialog::PreTranslateMessage(pMsg); ;q Z2V
} K#jm6Xh?E
)1/O_N6C
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ^gG,}GTl
{ 3$Je,|bs
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ R<-KXT9
SaveBmp(); Y2Bu,/9^
return FALSE; I8y\D,
} \GWC5R7Q0j
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){
VMp6s%m
CMenu pop; +Ji dP
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); *L=CJg
CMenu*pMenu=pop.GetSubMenu(0); L6T_&AiL$
pMenu->SetDefaultItem(ID_EXITICON); _
0-YsD
CPoint pt; tBrVg<]t
GetCursorPos(&pt); F~EriO
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); k.%F!sK
if(id==ID_EXITICON) vJ!t.Vou
DeleteIcon(); R-ci?7d t3
else if(id==ID_EXIT) /-T%yuU
OnCancel(); lI9 3{!+>
return FALSE; 5s;#C/ZZ
} c!zu0\[Id
LRESULT res= CDialog::WindowProc(message, wParam, lParam); W8)GT`\
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) f&:g{K
AddIcon(); qpZ".
return res; 5gGr|d|(
} sMZ \6
&PbH!]yd
void CCaptureDlg::AddIcon() |c)#zSv
{ ec|IT0;
NOTIFYICONDATA data; {PZe!EQ
data.cbSize=sizeof(NOTIFYICONDATA); 5@Sb[za
CString tip; 3hkA`YSYt
tip.LoadString(IDS_ICONTIP); V;$lgTs|'
data.hIcon=GetIcon(0); ?S"xR0 *
data.hWnd=GetSafeHwnd(); &3rh{" ^9
strcpy(data.szTip,tip); ?pFHpz
data.uCallbackMessage=IDM_SHELL; k:fRk<C
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ]BA8[2=m
data.uID=98; '2NeuK -KD
Shell_NotifyIcon(NIM_ADD,&data); --FvE|I
ShowWindow(SW_HIDE); yDPek*#^"q
bTray=TRUE; /)~McP3
} bz1\EkLL
bkb}M)C
void CCaptureDlg::DeleteIcon() {+!_; zzZ
{ 2l9_$evK~
NOTIFYICONDATA data; kns[b [!H
data.cbSize=sizeof(NOTIFYICONDATA); I)clGMS,
data.hWnd=GetSafeHwnd(); c8(.bmvF
data.uID=98; %BL +'&q
Shell_NotifyIcon(NIM_DELETE,&data); 4WLB,<b}
ShowWindow(SW_SHOW); /SyiJCx0
SetForegroundWindow(); s;bqUY?LD
ShowWindow(SW_SHOWNORMAL); BzDS
bTray=FALSE; T6tJwSS4:
} bcQ$S;U)
U9Sp$$L
void CCaptureDlg::OnChange() dG1qrh9_-
{ Rcu/ @j{O
RegisterHotkey(); {|qz>
} ~`y6YIJ3
B|!Re4`0
BOOL CCaptureDlg::RegisterHotkey() d6uL;eR
{ )9}z^+TH
UpdateData(); }RXm=ArN
UCHAR mask=0; dme_Ivt
UCHAR key=0;
*h`zV<j
if(m_bControl) ,$*$w<
mask|=4; 'E9\V\bi
if(m_bAlt) Q WOd&=:
mask|=2; G*ecM`Bl
if(m_bShift) =T[kGg8`
mask|=1; &TKB8vx=#
key=Key_Table[m_Key.GetCurSel()]; %#=
1?1s
if(bRegistered){ #fQStO
DeleteHotkey(GetSafeHwnd(),cKey,cMask); 8kk$:8
bRegistered=FALSE; J:t1W=lJ3
} 1|2X0Xm{
cMask=mask; LcQ \d*
cKey=key; lE4.O
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Y#KgaZ7N
return bRegistered; i),W1<A1
} "/K44(^
zT.qNtU%
四、小结 U`xjau+
>XBLm`a
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。