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:
<]"aP1+C
%(n4`@ 一、实现方法
Oa*/jZjr KaO8rwzDN 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:
zQ7SiRt7* _a c_8m #pragma data_seg("shareddata")
Fnr*.k HHOOK hHook =NULL; //钩子句柄
,A_itRHH UINT nHookCount =0; //挂接的程序数目
G;,2cu
K static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
'e0qdY` static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
Mc{1Cdj static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
Th@L68 static int KeyCount =0;
yzXwxi1# static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
l=kgRh #pragma data_seg()
Dx iCq(; 0PTB3- 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。
*USZ2|i RU#Q<QI( 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:
2\m+ N7Dm,Q ] BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
'9i:b]Hru cKey,UCHAR cMask)
C[&Lh_F\ {
W"z!sf5U BOOL bAdded=FALSE;
#{<Jm?sU for(int index=0;index<MAX_KEY;index++){
5$N4<Lo7 if(hCallWnd[index]==0){
.XS rLb? hCallWnd[index]=hWnd;
R1?g6. Mq HotKey[index]=cKey;
ynDa4HB HotKeyMask[index]=cMask;
'0w'||#1 bAdded=TRUE;
$] w&`F- KeyCount++;
6nxf<1 break;
Rqu;;VI[ }
@{~x:P5g }
q"fK"H-j return bAdded;
!+CRS9\D }
Qx$Yj //删除热键
|9}G BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Z @j0J[s {
[L9e.n1 BOOL bRemoved=FALSE;
A2F+$N for(int index=0;index<MAX_KEY;index++){
=q>eoXp if(hCallWnd[index]==hWnd){
CJ
KFNa if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
KXYq|w hCallWnd[index]=NULL;
hX~IZ((Hi8 HotKey[index]=0;
1\_4# @') HotKeyMask[index]=0;
c1e7h l bRemoved=TRUE;
#2Mz.=#G KeyCount--;
4l[f}Z break;
HOXqIZN85 }
O{LWQ"@y }
T4._S:~ }
)%WS(S>8 return bRemoved;
!d%OoRSU' }
kXv
-B-wOj Jg|/*Or 5ahAp]; DLL中的钩子函数如下:
yn4Xi@9Pri e6#^4Y/+` LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
P4ot,Q4 {
Uu8Z2M BOOL bProcessed=FALSE;
LWf+H 4iZ} if(HC_ACTION==nCode)
efRa|7!HK {
c\"oj&>A if((lParam&0xc0000000)==0xc0000000){// 有键松开
8`9!ocrM switch(wParam)
6BNOF66kH {
CKrh14ul case VK_MENU:
0;r+E*`DA MaskBits&=~ALTBIT;
b8Y1 .y"# break;
lbTz case VK_CONTROL:
d v" MaskBits&=~CTRLBIT;
's!EAqCN break;
/dBQ*f5 case VK_SHIFT:
GfPe0&h MaskBits&=~SHIFTBIT;
_9""3O break;
cA AJ7? default: //judge the key and send message
dt^yEapjM break;
H&`p9d*(e }
W!V06. for(int index=0;index<MAX_KEY;index++){
h"M}Iz~|V? if(hCallWnd[index]==NULL)
@N"h,(^ continue;
,$7LMTVDrE if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
N{
;{<C9Z {
` _[\j] SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
phEM1",4T bProcessed=TRUE;
/Y%) Y }
`L7 cS }
hjaI&?w }
UYGl else if((lParam&0xc000ffff)==1){ //有键按下
B5P++aQ switch(wParam)
ZXe[>H {
NM case VK_MENU:
i#iY;R8 MaskBits|=ALTBIT;
c;BQ$je} break;
#](ML:! case VK_CONTROL:
VqbMFr<k MaskBits|=CTRLBIT;
BqKD+ break;
^L<1S/~) case VK_SHIFT:
Cf2rRH MaskBits|=SHIFTBIT;
?r2Im5N break;
UFC.!t-Z default: //judge the key and send message
5rfGMk< break;
BDD^*Y }
ZO
W{rv] for(int index=0;index<MAX_KEY;index++){
-L</,>p if(hCallWnd[index]==NULL)
3eFD[c%mN continue;
eW0:&*.vMj if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Pg|q{fc {
DZ(e^vq SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
] l}8 bProcessed=TRUE;
pJK puoiX }
,R3D }
rS{Rzs^@ }
FV! if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
o_X"+ s for(int index=0;index<MAX_KEY;index++){
3,S5>~R= if(hCallWnd[index]==NULL)
8!S="_ continue;
!> if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
,Es5PmV@$% SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
/N{x Ft/? //lParam的意义可看MSDN中WM_KEYDOWN部分
+q1
@8 }
JY_+p9KfyQ }
kc1 *@<L6 }
on\0i{0l8 return CallNextHookEx( hHook, nCode, wParam, lParam );
T1\.~]-msb }
x]Nq|XK }7wQFKME 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:
c3g\*)Jz"F X;6&:%ZL@^ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
4$1sBY/ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
p+#uPY1# ~?+Jt3?, 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
"((6)U# htkn#s~= LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
Jg/WE1p> {
BVC\~j
j if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
/J wQ5 {
!
FhN(L[=j //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
gV$Lfkz SaveBmp();
w3fi2B&q return FALSE;
)xT_RBR }
gMFTZQsP …… //其它处理及默认处理
mVP@c&1w? }
\
Lrg: 0Eo*C9FP~ 57%:0loW 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。
wvBJ?t, 7f~.Qus 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。
QU8?/ h9 [ov) 二、编程步骤
\b{=&B[Q$' Pdrz lu 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";
\; $j
"i& !!DHfAV] 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
Ko kmylHu ,^`+mP 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;
=cX&H oju4.1 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;
P0 hC4Sxf 83OOM;' 5、 添加代码,编译运行程序。
V`G)8?% Vy u=p([
5] 三、程序代码
]* ': EX|Wd|aK ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
U43PHcv_ #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
lJ:B9n3OzT #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
k
32Jz.\B #if _MSC_VER > 1000
$:{uF# #pragma once
J XbG|L #endif // _MSC_VER > 1000
) zz"DH #ifndef __AFXWIN_H__
z;2kKQZm #error include 'stdafx.h' before including this file for PCH
NIQNzq?a^ #endif
bTb|@ #include "resource.h" // main symbols
u4rG e! class CHookApp : public CWinApp
'HH[[9Q {
zxT&K| public:
u\Tq5PYXt CHookApp();
D)K/zh) // Overrides
'\[GquK;P // ClassWizard generated virtual function overrides
`G@]\)-! //{{AFX_VIRTUAL(CHookApp)
WVir[Kv% public:
o~*% g. virtual BOOL InitInstance();
mj{TqF virtual int ExitInstance();
,4)zn6tC //}}AFX_VIRTUAL
qI5_@[S* //{{AFX_MSG(CHookApp)
&3:-(:<U // NOTE - the ClassWizard will add and remove member functions here.
'>@evrG // DO NOT EDIT what you see in these blocks of generated code !
pbl;n| //}}AFX_MSG
>E^sZmY[f- DECLARE_MESSAGE_MAP()
tF
O27z@ };
ApG_Gd. LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
PI)lJ\ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
.Q>.|mu BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
r@%-S!$ BOOL InitHotkey();
MOJKz!% BOOL UnInit();
SdeKRZ{o #endif
hDSt6O4za l> W?XH //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
g;UB+Y 247 #include "stdafx.h"
%8DU}}Rj #include "hook.h"
\h!%U*!7{ #include <windowsx.h>
l*e*jA_>:7 #ifdef _DEBUG
a[1^)=/DM #define new DEBUG_NEW
5.q2<a : #undef THIS_FILE
|p-, B>p! static char THIS_FILE[] = __FILE__;
to|O]h2*U2 #endif
O>IY<]x>L #define MAX_KEY 100
`gDpb.=Y #define CTRLBIT 0x04
J4;w9[a$ #define ALTBIT 0x02
SRRqIQz #define SHIFTBIT 0x01
!NuiVC] #pragma data_seg("shareddata")
.-awl1 W HHOOK hHook =NULL;
9i;%(b{ UINT nHookCount =0;
N>/!e787OU static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
;xS@-</: static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
P\pHos static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
^mv F%"g static int KeyCount =0;
W.'#pd static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
!9_HZ(W& #pragma data_seg()
HQCxO? HINSTANCE hins;
}~DlOvsq void VerifyWindow();
8iGS=M BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
^<}9#q/rt //{{AFX_MSG_MAP(CHookApp)
;}@.E@s%' // NOTE - the ClassWizard will add and remove mapping macros here.
{^a"T'+ // DO NOT EDIT what you see in these blocks of generated code!
'JU(2mF //}}AFX_MSG_MAP
nm`[\3R END_MESSAGE_MAP()
~k^rI jR (y*7
gf CHookApp::CHookApp()
aY@]mMz\ {
EZ:pcnL{ // TODO: add construction code here,
?
%XTD39 // Place all significant initialization in InitInstance
%JF^@\E!| }
p.A_,iE UyTsUkY CHookApp theApp;
6!*be|<& LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
IW?).%F {
U5\^[~vW BOOL bProcessed=FALSE;
DvB!-|ek if(HC_ACTION==nCode)
O2g9<H {
;h<(vc3@f if((lParam&0xc0000000)==0xc0000000){// Key up
zo6|1xq switch(wParam)
z$4g9 {
,R#pQ
4 case VK_MENU:
qIS9.AL MaskBits&=~ALTBIT;
K|,P break;
$P&{DOiKS case VK_CONTROL:
#.L9/b(
MaskBits&=~CTRLBIT;
ZP~Mgz{f break;
wI8 case VK_SHIFT:
\@&oK2f MaskBits&=~SHIFTBIT;
"\cDSiD break;
R/ix,GC default: //judge the key and send message
CT1@J-np break;
<:/Lap#D^ }
p!B&&)&db for(int index=0;index<MAX_KEY;index++){
v3PtiKS if(hCallWnd[index]==NULL)
BbsgZ4 continue;
55q!2>Jh. if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Q]$gw,H"6 {
v3O+ ;4 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
7^)8DwAl bProcessed=TRUE;
-<H\VT%98 }
bi/ AQ^ }
FnxPM`Zx }
cq+G 0F+H else if((lParam&0xc000ffff)==1){ //Key down
diHK switch(wParam)
|y1O M {
!ij
R case VK_MENU:
0Xo>f"2<f MaskBits|=ALTBIT;
;E:vsVK break;
&n$kVNE case VK_CONTROL:
Iue}AGxu:{ MaskBits|=CTRLBIT;
nilis-Bk_ break;
I]Ev6>=; case VK_SHIFT:
]Q0m]OaT MaskBits|=SHIFTBIT;
>x?x3 #SX break;
}uP`=T!"8 default: //judge the key and send message
^Gi9&fS, break;
!ZNirvk }
B|d-3\sn for(int index=0;index<MAX_KEY;index++)
dynkb901s {
{=K);z if(hCallWnd[index]==NULL)
zVt1Ta:j continue;
lCafsIB if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
`A\,$(q+ {
h4p<n&)F SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
'3<T~t bProcessed=TRUE;
Z9wKjxu+ }
Fi+8| /5 }
^AhV1rBB }
~:FF"T> if(!bProcessed){
xVxN
@[ for(int index=0;index<MAX_KEY;index++){
#qLsAw--Q if(hCallWnd[index]==NULL)
mrmm@? continue;
|\.:h":!0~ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
Me 5Xd| SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
RN^<bt{_U }
K*R }
-al\*XDz }
'+EtnWHs return CallNextHookEx( hHook, nCode, wParam, lParam );
(aC~0
#4 }
`D/<*e,# [#@\A]LO BOOL InitHotkey()
i+q tL3 {
:;
z]:d if(hHook!=NULL){
,J6t
1V nHookCount++;
YCl&}/.pA return TRUE;
>Nam@,hm }
ZLDO&} else
/a,"b8 hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
2#
72B if(hHook!=NULL)
Bnp\G h nHookCount++;
$^:s)Yv return (hHook!=NULL);
Qm_IU!b }
W Og pDs BOOL UnInit()
bv^wE,+?o {
f9K+o-P.h if(nHookCount>1){
7D(Eo{ue nHookCount--;
CdZ. T/x return TRUE;
m!5MGq~ }
7Pe<0K)s( BOOL unhooked = UnhookWindowsHookEx(hHook);
!zVjbYWY if(unhooked==TRUE){
k"3@G?JY nHookCount=0;
;!S i_b2 hHook=NULL;
a yYl3 }
jn
+*G<NJ return unhooked;
t|urvoz }
vpq"mpfkh o 9rZ&Q< BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
sU(<L0 {
a B$x(8pP@ BOOL bAdded=FALSE;
#<K'RJn for(int index=0;index<MAX_KEY;index++){
LpK? C<?x if(hCallWnd[index]==0){
>P+oNY hCallWnd[index]=hWnd;
%i6/=
'u HotKey[index]=cKey;
EtnuEU HotKeyMask[index]=cMask;
l{I.l bAdded=TRUE;
/IQ$[WR cx KeyCount++;
|&"/u7^ break;
`h%K8];<6f }
6t\0Ui }
!J&UO/q. return bAdded;
2BKiA[
;; }
kyi"U A82 +iqzj-e&e[ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
4|&_i)S-Y {
::p%R@? BOOL bRemoved=FALSE;
QE|x[?7e,! for(int index=0;index<MAX_KEY;index++){
(gRTSd T? if(hCallWnd[index]==hWnd){
mEmgr(W if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
Cxd^i hCallWnd[index]=NULL;
*ESi~7;# HotKey[index]=0;
]GT+UX HotKeyMask[index]=0;
>*/:"!u bRemoved=TRUE;
}Ug$d>\ KeyCount--;
+~>cAWZq_ break;
q`VkA
\ }
j[,XJ,5= }
5g%D0_e5 }
y@@h )P# return bRemoved;
( Sjlm^bca }
.6!cHL3ln \sAkKPI void VerifyWindow()
Quwq_.DU {
J`4V\D}n for(int i=0;i<MAX_KEY;i++){
?bH` if(hCallWnd
!=NULL){ 75pn1*"gQ
if(!IsWindow(hCallWnd)){ *JRM(V+IEv
hCallWnd=NULL; jR9;<qT/
HotKey=0; #kk5{*`
HotKeyMask=0; ]u^ybW"
KeyCount--; 7z_ZD0PxPc
} YSzC's[
} rB-R(2
CCN
} #@' B\!<@=
} l,6' S8=
]UkqPtG;
BOOL CHookApp::InitInstance() j u&v4]
{ <*I*#WI&B
AFX_MANAGE_STATE(AfxGetStaticModuleState()); A{dqB
hins=AfxGetInstanceHandle(); s{OV-H
InitHotkey(); `z`=!1
return CWinApp::InitInstance(); `,O"^zR)z
} VnqcpJ
?E,-P!&R
int CHookApp::ExitInstance() Scug
wSB
{ 3&I3ViAH
VerifyWindow(); 8`s*+.LI!
UnInit(); _%3p&1ld
return CWinApp::ExitInstance(); 0dIGX |e
} g*Pn_Yo[.
p' 6h9/
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ,k1ns?i9KH
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) p-m\0tQ
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ^ ;K"Y'f$
#if _MSC_VER > 1000 >(_2'c*[w
#pragma once +xAD;A4
#endif // _MSC_VER > 1000 -'}#j\
_>a`dp.19
class CCaptureDlg : public CDialog \PD%=~
{ 2c51kG77E
// Construction .AQTUd(_
public: qo}yEl1
BOOL bTray; pI.~j]*:{
BOOL bRegistered; <>( v~a]
BOOL RegisterHotkey(); v-8{mK`9\
UCHAR cKey; "!&
o|!2
UCHAR cMask; nltOX@P-
void DeleteIcon(); [?=DPE%
void AddIcon(); Q,:h`%V
UINT nCount; PT~F^8,)
void SaveBmp(); QkWEVL@uM
CCaptureDlg(CWnd* pParent = NULL); // standard constructor q Y!LzKM0
// Dialog Data gV$0J?Pr.
//{{AFX_DATA(CCaptureDlg) I?nU+t;
enum { IDD = IDD_CAPTURE_DIALOG }; 4=%,0.yt
CComboBox m_Key; O2"@09:
BOOL m_bControl; oCLM'\
BOOL m_bAlt; e\O625
BOOL m_bShift; ?)[=>Kp
CString m_Path; C?MKbD=K
CString m_Number; v9!]/]U^
//}}AFX_DATA ,-kz\N@.
// ClassWizard generated virtual function overrides fB&i{_J
//{{AFX_VIRTUAL(CCaptureDlg) cmYzS6f,7
public: gv&Hu$ca
virtual BOOL PreTranslateMessage(MSG* pMsg); |MN2v[y
protected: 1vAJ(O{-
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Ic^
(6
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); AFeFH.G6Jr
//}}AFX_VIRTUAL 6ZwQ/~7H
// Implementation C!nbl+75
protected: hD7vjg&Z
HICON m_hIcon; 4/_!F'j
// Generated message map functions <[T{q
|*
//{{AFX_MSG(CCaptureDlg) M$Rh]3vqR
virtual BOOL OnInitDialog(); n<@C'\j@
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); X)=m4\R
afx_msg void OnPaint(); DwK$c^2q{.
afx_msg HCURSOR OnQueryDragIcon(); gxJ12'
m
virtual void OnCancel(); DGw*BN%`
afx_msg void OnAbout(); ~Y;Z5e=
afx_msg void OnBrowse(); m?1r@!/y
afx_msg void OnChange(); <]_[o:nOP
//}}AFX_MSG <u1`o`|-
DECLARE_MESSAGE_MAP() knfmJUT
}; bPkz= ^-
#endif kY9$ M8b
U-$nwji
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file " YOl6n
#include "stdafx.h" ah(k!0PV
#include "Capture.h" ``@e7~F{
#include "CaptureDlg.h" m( %PZ*s
#include <windowsx.h> ka{!' ^
#pragma comment(lib,"hook.lib") 0zsmZ]b5E
#ifdef _DEBUG ytb1h Fs
#define new DEBUG_NEW B?e]
Ht
#undef THIS_FILE g706*o)h
static char THIS_FILE[] = __FILE__; T-x9IoE
#endif MUCes3YJH
#define IDM_SHELL WM_USER+1 Po.by~|
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 83aWMmA(1
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); /^gu&xnS
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 6\VZ6oS
class CAboutDlg : public CDialog W@%g_V}C*
{ ^X"x,8}&V
public: |TF6&$>d
CAboutDlg(); o h9L2 "
// Dialog Data Qw"%Xk
//{{AFX_DATA(CAboutDlg) hvA|d=R(
enum { IDD = IDD_ABOUTBOX }; ~jz51[{v
//}}AFX_DATA Id>I.e4
// ClassWizard generated virtual function overrides ?+%bEZ`
//{{AFX_VIRTUAL(CAboutDlg) )YZx]6\l)
protected: 5)0'$Xxqa0
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support sv#b5,>9
//}}AFX_VIRTUAL ocZ^rqo2w
// Implementation 1(e64w@
protected: =j{Kxnv
//{{AFX_MSG(CAboutDlg) F6>oGmLy
//}}AFX_MSG 9w=[}<E
DECLARE_MESSAGE_MAP() #qK5i1<
}; ktp<o.f[
+/" \.wYv
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) vskp1 Wi(
{ -MFePpUt
//{{AFX_DATA_INIT(CAboutDlg) \eRct_
//}}AFX_DATA_INIT P.mlk>r
} dyohs_
P'*Fd3B#A=
void CAboutDlg::DoDataExchange(CDataExchange* pDX) _1~pG)y$U
{ Wr'1Y7z
CDialog::DoDataExchange(pDX); ViG>gMG v
//{{AFX_DATA_MAP(CAboutDlg) ?I\,RiZkz^
//}}AFX_DATA_MAP 7<Y aw,G
} 4U u`1gtz
9\0$YY%
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
;kT~&.,y
//{{AFX_MSG_MAP(CAboutDlg) Iv*u#]{t
// No message handlers ,zxv>8Nt
//}}AFX_MSG_MAP 'rA(+-.M;
END_MESSAGE_MAP() J93xxj
[khXAf1{Q
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) q1m{G1W
n
: CDialog(CCaptureDlg::IDD, pParent) LC\U6J't1
{ !0F+qzGG7
//{{AFX_DATA_INIT(CCaptureDlg) G&"O)$h
m_bControl = FALSE; p./0N.
m_bAlt = FALSE; 2.MY8}&WBu
m_bShift = FALSE; ,_Kr}RH
m_Path = _T("c:\\"); &y(%d 7@/
m_Number = _T("0 picture captured."); ? nq%'<^^
nCount=0; L|6I
bRegistered=FALSE; 7+qKA1t^
bTray=FALSE; +(^HL3
//}}AFX_DATA_INIT l,zhBnD
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 X;
6=WqJj
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); O~Bh(_R&
} !e*T.
1Kz
NCl@C$W9q
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 5L_`Fw\l
{ nd7g8P9p
CDialog::DoDataExchange(pDX); M>}_2G]#F
//{{AFX_DATA_MAP(CCaptureDlg) PC|ul{[*}
DDX_Control(pDX, IDC_KEY, m_Key); +w"?q'SnF
DDX_Check(pDX, IDC_CONTROL, m_bControl); `*U$pg
DDX_Check(pDX, IDC_ALT, m_bAlt); `csZ*$7
DDX_Check(pDX, IDC_SHIFT, m_bShift); {^1''
DDX_Text(pDX, IDC_PATH, m_Path); ;47z.i&T
DDX_Text(pDX, IDC_NUMBER, m_Number); j#Tl\S!m.I
//}}AFX_DATA_MAP %l6E0[
} c*\;!dbP
bdG@%K',
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) &b7_%,Bx4
//{{AFX_MSG_MAP(CCaptureDlg) |(.%`BTD
ON_WM_SYSCOMMAND() OA(.&5]
ON_WM_PAINT() F\L!.B
ON_WM_QUERYDRAGICON() D/GE-lq
ON_BN_CLICKED(ID_ABOUT, OnAbout) RBBmGZ
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) >k/cm3
ON_BN_CLICKED(ID_CHANGE, OnChange) U4<c![Pp.
//}}AFX_MSG_MAP _A])q
END_MESSAGE_MAP() " 0m4&K(3,
h9#)Eo
BOOL CCaptureDlg::OnInitDialog() z^z`{B
{ /,UnT(/k(
CDialog::OnInitDialog(); P.QF9%
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ~QDM
.5
ASSERT(IDM_ABOUTBOX < 0xF000); !a-B=pn!]
CMenu* pSysMenu = GetSystemMenu(FALSE); 0!7p5
if (pSysMenu != NULL) ! Dj2/][
{ V; CPn
CString strAboutMenu; py+\e"s
strAboutMenu.LoadString(IDS_ABOUTBOX); S(?A3 H
if (!strAboutMenu.IsEmpty()) [[zNAq)"
{ _SJ:|I
pSysMenu->AppendMenu(MF_SEPARATOR); u6Lx3
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); HD/!J9&
} ,isjiy
J
} S#$Kmm
|
SetIcon(m_hIcon, TRUE); // Set big icon T ~(Sc'8
SetIcon(m_hIcon, FALSE); // Set small icon m}\QGtJ6
m_Key.SetCurSel(0); aWJj@',_
RegisterHotkey(); p:z~>ca
CMenu* pMenu=GetSystemMenu(FALSE); i7e6l C
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Y#tur`N
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); CxZh^V8LP
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); l`i97P?/W
return TRUE; // return TRUE unless you set the focus to a control \C h01LR"
} 2E[7RBFY+\
I[d<SHo
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) v8j3
K
{ TlRc8r|
if ((nID & 0xFFF0) == IDM_ABOUTBOX) ^|]Dg &N.
{ ~x#TfeU]
CAboutDlg dlgAbout; "=T&SY
dlgAbout.DoModal(); Y)+q[MZ R
} +yHz7^6-5
else c38XM]Jeq
{ 4=MjyH|[Jx
CDialog::OnSysCommand(nID, lParam); CgrQ"N5
} J}:.I>
} qq]Iy=
y& 1@d+Lf
void CCaptureDlg::OnPaint() ?1a9k@[t
{ ne/JC(
if (IsIconic()) F_jHi0A
{
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HU`j
CPaintDC dc(this); // device context for painting vIbM@Y4
'?
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); dK4rrO
// Center icon in client rectangle ]L7A$sTUQ
int cxIcon = GetSystemMetrics(SM_CXICON); 2R.LLE
int cyIcon = GetSystemMetrics(SM_CYICON); _Uq' N0U
CRect rect; <.B+&3')
GetClientRect(&rect); }$4z$&
int x = (rect.Width() - cxIcon + 1) / 2; G7Sw\wW
int y = (rect.Height() - cyIcon + 1) / 2; Wi'}d6c
// Draw the icon HOF$(86zqA
dc.DrawIcon(x, y, m_hIcon); h0@a"DqK
} f$ xp74hw3
else Xa?O)Bq.
{ pX?3inQP%(
CDialog::OnPaint(); }:
HG)V
} EZ]4cd/i
} dQ.#8o=
UI+6\ 3
HCURSOR CCaptureDlg::OnQueryDragIcon() O'mcN*
{ ?YLq
iAA
return (HCURSOR) m_hIcon; D5D *$IC
} @we1#Vz.
Mzp<s<BX
void CCaptureDlg::OnCancel() ;*M@LP{*L
{ "J 1A9|
if(bTray) ?<TJ}("/
DeleteIcon(); 89g
a+#7
CDialog::OnCancel(); JfIXv
} MK=oGzK
0lg$zi x(
void CCaptureDlg::OnAbout() -}|L<~
{ KBmO i
CAboutDlg dlg; >8>!wi9U
dlg.DoModal(); iM)K:L7d
} :_~.Nt
QLWnP-
void CCaptureDlg::OnBrowse() gHrs|6q9
{ ^H3N1eC,`F
CString str; cMXv
BROWSEINFO bi; qTr P@F4`g
char name[MAX_PATH]; ^{4BcM7eH
ZeroMemory(&bi,sizeof(BROWSEINFO)); =cS&>MT
bi.hwndOwner=GetSafeHwnd(); jtP*C_Scv/
bi.pszDisplayName=name; :ZV|8xI
bi.lpszTitle="Select folder"; d+D~NA[M
bi.ulFlags=BIF_RETURNONLYFSDIRS; oLT#'42+H
LPITEMIDLIST idl=SHBrowseForFolder(&bi); L7-BuW}&
if(idl==NULL) 1
:p'
return; ew~Z/ A
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); >v.fH6P,}
str.ReleaseBuffer(); E1eGZ&&Gd
m_Path=str; CO='[1"_5
if(str.GetAt(str.GetLength()-1)!='\\') gEd A
hfx
m_Path+="\\"; e0zP LU}
UpdateData(FALSE); Z8#nu
} 7~e,"^>T
\yr9j$
void CCaptureDlg::SaveBmp() p%I'd^}.!
{ i6'=]f'{
CDC dc; /Sw~<B!8N
dc.CreateDC("DISPLAY",NULL,NULL,NULL); b&:v6#i
CBitmap bm; _x,X0ncv]@
int Width=GetSystemMetrics(SM_CXSCREEN); rexv)!J
int Height=GetSystemMetrics(SM_CYSCREEN); d_yvG.#C
bm.CreateCompatibleBitmap(&dc,Width,Height); aDF@AS
CDC tdc; P}v
;d]
tdc.CreateCompatibleDC(&dc); u2 s
CBitmap*pOld=tdc.SelectObject(&bm); ("2X8(3z
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); M:/NW-:
tdc.SelectObject(pOld); {EoYU\x
BITMAP btm; nK1eh@a9Qv
bm.GetBitmap(&btm); 0K%okq|n
DWORD size=btm.bmWidthBytes*btm.bmHeight; *[Z`0AgP
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); >GGM76vB=,
BITMAPINFOHEADER bih; !p&<.H_
bih.biBitCount=btm.bmBitsPixel; k$3pmy*
bih.biClrImportant=0; JU?;Kq9R
bih.biClrUsed=0; yE8D^M|g
bih.biCompression=0; EZ)b E9
bih.biHeight=btm.bmHeight; An.
A1y
bih.biPlanes=1; xE:jcA
d$}
bih.biSize=sizeof(BITMAPINFOHEADER); 1=R$ RI
bih.biSizeImage=size; 9zwD%3Ufn
bih.biWidth=btm.bmWidth; 4X+xh|R:U
bih.biXPelsPerMeter=0; TEz;:* ,CG
bih.biYPelsPerMeter=0; 6e-ME3!<l
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 41X`.
static int filecount=0; qVC+q8
CString name; E>bkEm
name.Format("pict%04d.bmp",filecount++); LZV- E=`
name=m_Path+name; r1L@p[>
BITMAPFILEHEADER bfh; gNB+e5[; 2
bfh.bfReserved1=bfh.bfReserved2=0; 8z`ZHn3=
bfh.bfType=((WORD)('M'<< 8)|'B'); &=g3J4$z
bfh.bfSize=54+size; :#YC_
id
bfh.bfOffBits=54; nn7LL+h
CFile bf; Q,KNZxT,q
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 6!\V|
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ywwA,9~
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); |Ea%nghl
bf.WriteHuge(lpData,size); Hr?lRaV
bf.Close(); A8'RM F1
nCount++; ^Arv6kD,
} `MI\/oM@
GlobalFreePtr(lpData); tbS hSbj
if(nCount==1) Cn~VJ,l
g
m_Number.Format("%d picture captured.",nCount); J@5iD
else YSP\+ZZ
m_Number.Format("%d pictures captured.",nCount); ]Dq6XR
UpdateData(FALSE); KU|W85ye
} gi!_Nz
duG!QS:
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) <P h50s4
{ Wk%|%/:
if(pMsg -> message == WM_KEYDOWN) I3Vu/&8f|
{ %1i:*~g
if(pMsg -> wParam == VK_ESCAPE) ojM'8z0Hn
return TRUE; R-Edht|{
if(pMsg -> wParam == VK_RETURN) syl7i>P
return TRUE; W.j^L;
} _k@cs^
return CDialog::PreTranslateMessage(pMsg); $JY\q2
} OJ&'Z}LB
T!c|O3m
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) HMd?`
{ Nc\DXc-N
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ *Jsb~wta
SaveBmp(); XDPR$u8hM
return FALSE; RTmp$lV
} NXOXN]=c<
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ %~Yo{4mHs
CMenu pop; 2.v{W-D[
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); AG,><UP
CMenu*pMenu=pop.GetSubMenu(0); u@_|4Bp,"
pMenu->SetDefaultItem(ID_EXITICON); Z<X=00,wg
CPoint pt; f;'*((
GetCursorPos(&pt); >=N-P<%
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 4/(#masIL
if(id==ID_EXITICON) v2;E W p
DeleteIcon(); wpZ"B+oK!
else if(id==ID_EXIT) /b,>fK^
OnCancel(); x# 0?$}f<
return FALSE; Qder8I
} 0|AgmW_7
.
LRESULT res= CDialog::WindowProc(message, wParam, lParam); yJ?=##
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) PysDDU}v
AddIcon(); yQhO-jT
return res; w9|x{B
} c+FTt(\8.
.n7@$kq
void CCaptureDlg::AddIcon() s{^B98d+W
{ tD.#*.7
NOTIFYICONDATA data; QM(xMq
data.cbSize=sizeof(NOTIFYICONDATA); 38w^="-T
CString tip; lj<Sa
tip.LoadString(IDS_ICONTIP); p-s\D_
data.hIcon=GetIcon(0); xa)p,
data.hWnd=GetSafeHwnd(); chICc</l&
strcpy(data.szTip,tip); xNIrmqm5]
data.uCallbackMessage=IDM_SHELL; cSPQ
NYU:
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; FJ0I&FyWs
data.uID=98; Jr5S8c|"
Shell_NotifyIcon(NIM_ADD,&data); 9QU\J0c/
ShowWindow(SW_HIDE); ZUI6VM
bTray=TRUE; qx#M6\L!
} YrL(4 Nt8
UBL{3s^"
void CCaptureDlg::DeleteIcon() Z1fY' f
{ ()aCE^C
NOTIFYICONDATA data; U`6|K$@
data.cbSize=sizeof(NOTIFYICONDATA); f"7MYw\
data.hWnd=GetSafeHwnd(); Oi\ s
data.uID=98; #Vum
Shell_NotifyIcon(NIM_DELETE,&data); .=eEuH
ShowWindow(SW_SHOW); }# s{."
SetForegroundWindow(); $NR[U+
ShowWindow(SW_SHOWNORMAL); Hhtl~2t!0
bTray=FALSE; JU)^b
V_
} +2iD9X{$MX
$W7}Igx#
void CCaptureDlg::OnChange() V0^{Ss1M
{ ^}P94( oz
RegisterHotkey(); ec;
} /phMrL=
AUD)=a>
BOOL CCaptureDlg::RegisterHotkey() d92Z;FWb
{ *)RKU),3nL
UpdateData(); uzHMQp
UCHAR mask=0; WVR/0l&bU
UCHAR key=0; Q\4tzb]
if(m_bControl) K/zb6=->
mask|=4; U5C]zswL
if(m_bAlt) JtO}i{A
mask|=2; dU3A:uS^
if(m_bShift) kTH""h{
mask|=1; g7! LX[
key=Key_Table[m_Key.GetCurSel()]; :fj>JF\[
if(bRegistered){ GTLS0l)
DeleteHotkey(GetSafeHwnd(),cKey,cMask); ^'=[+
bRegistered=FALSE; |?V7E\S
} _>vH%FY
cMask=mask; 2,:{ 5]Q$
cKey=key; Gy\]j
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); }<~(9_+
return bRegistered; l :{q I#Q
} x1Gx9z9
dm}1"BU<
四、小结 /Pextj<
_]@u)$
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。