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:
D>U(&n
S+eu3nMq 一、实现方法
%0vsm+XQ0E ^I6Vz?0Jl 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:
c9nv=?/}f )FA:wsy~E #pragma data_seg("shareddata")
FW3E UC)P HHOOK hHook =NULL; //钩子句柄
Xfb-<
Q0A UINT nHookCount =0; //挂接的程序数目
i8cmT+}> static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
'tQp&pj static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
e<A>??h^ static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
}43qpJe8U static int KeyCount =0;
vz:VegS static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
(VC Jn<@@ #pragma data_seg()
GqP02P'2 fOsvOC 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。
gd%Ho8,T /-^{$$eu 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:
XMI5j7CL F$|d#ny BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
8OS^3JS3" cKey,UCHAR cMask)
_\@zq*E {
,N_V(Cx5pt BOOL bAdded=FALSE;
5[*8CY for(int index=0;index<MAX_KEY;index++){
6>&(OV if(hCallWnd[index]==0){
bq5we*"V hCallWnd[index]=hWnd;
+>Y]1IlI HotKey[index]=cKey;
#4nBov3d HotKeyMask[index]=cMask;
g38MF bAdded=TRUE;
7;6'=0( KeyCount++;
u,=?|M\ break;
hDoFF8)c }
gCL}Ba }
?c_:S]^ return bAdded;
oj?y_0}:^ }
"9 vL+Hh //删除热键
UH(w, R` BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
vy-(:aH7U {
K1;b4Sl?A BOOL bRemoved=FALSE;
hv|-`}#0
for(int index=0;index<MAX_KEY;index++){
ycIcM~<4 if(hCallWnd[index]==hWnd){
1Z(9<M1!M if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
w:1UwgcPC hCallWnd[index]=NULL;
JnQ@uZb` HotKey[index]=0;
, a2=OV HotKeyMask[index]=0;
"N,@J-]/k bRemoved=TRUE;
Gt,VSpb~s KeyCount--;
o=lZl_5/u; break;
HB<>x }
+n
&8" ) }
F,mStw: }
|1(L~g return bRemoved;
*xx)j:Sc2 }
r0\C2g_X {8;}y[R B1Z; DLL中的钩子函数如下:
-" r4 GbkDs- LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
VhnIr#L+ {
{?cF2K# BOOL bProcessed=FALSE;
x'Nc} if(HC_ACTION==nCode)
RO[X#c {
{?mb.~( if((lParam&0xc0000000)==0xc0000000){// 有键松开
QPFv]^s( switch(wParam)
BryD?/}P)M {
7D~~<45ct case VK_MENU:
#rz!d/)Q MaskBits&=~ALTBIT;
!Ap*PL break;
!"F8jA} case VK_CONTROL:
urL@SeV+$ MaskBits&=~CTRLBIT;
Cf
v1nUW break;
:[C|3KKe" case VK_SHIFT:
s,|v,,<+ MaskBits&=~SHIFTBIT;
W_
;b e break;
9D?JzTsyg default: //judge the key and send message
\z@:OR, break;
+QSH*(, }
G 40 for(int index=0;index<MAX_KEY;index++){
l['ER$(7 if(hCallWnd[index]==NULL)
OSh'b$Z continue;
v>j<ky if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
<)L[V {
'RQEktm SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
&EC8{.7 bProcessed=TRUE;
4~vn%O6n }
%Go/\g }
],zp~yVU& }
AJoP3Zv|? else if((lParam&0xc000ffff)==1){ //有键按下
h54\
\Ci switch(wParam)
9'vf2) " {
vNm4xa% case VK_MENU:
}h sR} MaskBits|=ALTBIT;
=[TXH^.0 break;
+ =U9<8 case VK_CONTROL:
,o3`O |PiK MaskBits|=CTRLBIT;
aCfWbJ@qiG break;
M~9IL\J^G case VK_SHIFT:
?'tFTh MaskBits|=SHIFTBIT;
zP$"6~. break;
vXak5iq>X default: //judge the key and send message
{s2eOL5I|% break;
I3ugBLxVC3 }
iqWkhJphv for(int index=0;index<MAX_KEY;index++){
_Q b].~ if(hCallWnd[index]==NULL)
lI9|"^n7F continue;
ZV-Yq !|t if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
,L\KS^> {
+Q :)zE SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
+\.0Pr bProcessed=TRUE;
qE6D"+1y7 }
Z|3[Y@c\ }
{{ 1qkG9$ }
oRmA\R* if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
GIS,EwA
for(int index=0;index<MAX_KEY;index++){
_( QW2m?K if(hCallWnd[index]==NULL)
*M$$%G(4 continue;
E7<l^/<2S+ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
9SU/86|N SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
>5t]Zlb` //lParam的意义可看MSDN中WM_KEYDOWN部分
pT:6A[& }
N=@8~{V. }
3Z}KRsp3 }
i`w&{WTRQ return CallNextHookEx( hHook, nCode, wParam, lParam );
_|COnm }
HeHo?<>|d :?)q"hE 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:
H[?l)nZ} anH ]] BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
Zo Ra^o BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
hXc:y0
0 Bv7os3xb 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:
bhW&,"$Z <^e LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
+rDKx(Rk {
kr44@!s+' if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
FJsM3|{2=d {
UQBc$`v //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
{@ tO9pc`8 SaveBmp();
t+Qx-sW return FALSE;
;"NW=P& }
* YLpC^& …… //其它处理及默认处理
d(, M }
Z3 dI
B`@ H_u%e*W YizwKcuZ 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。
iu`B8yI T^2o'_: 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。
q9nQ/]rkHF {t('`z 二、编程步骤
oe=W}y_k suN}6CI 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";
uLt31G() VH~ZDZ1P 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
X/D%
cQ6 NLev(B:OQH 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;
O7f"8|=HX *3y_FTh8ra 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;
H<l0]-S{ ?|GwuG8g 5、 添加代码,编译运行程序。
0)9n${P7d $$T a 三、程序代码
|u[@g`Z "l(<<Ha/ ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
LiJ. / #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
*nHkK!d<N #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
~[0^{$rrWs #if _MSC_VER > 1000
n?v$C:jLN #pragma once
}Gd^r #endif // _MSC_VER > 1000
rxeOT# N} #ifndef __AFXWIN_H__
Ro#O{ #error include 'stdafx.h' before including this file for PCH
oLt%i:, A #endif
$A)[s$ #include "resource.h" // main symbols
t<SCrLbz class CHookApp : public CWinApp
[XD3}'Aa {
*zv*T"&ZP public:
6KX/Yj~B CHookApp();
+
$Lc'G+: // Overrides
Rab7Y,AA // ClassWizard generated virtual function overrides
MVp+2@)}s //{{AFX_VIRTUAL(CHookApp)
t28 y=nv public:
`Oe}OSxnT virtual BOOL InitInstance();
stq%Eg? virtual int ExitInstance();
lkQ(?7 //}}AFX_VIRTUAL
>oyZD^gj //{{AFX_MSG(CHookApp)
W'5c%SI // NOTE - the ClassWizard will add and remove member functions here.
KWn. // DO NOT EDIT what you see in these blocks of generated code !
5&}p'6*K //}}AFX_MSG
s<8|_Dt DECLARE_MESSAGE_MAP()
X7)B)r}AG };
VW**N}1#C LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
xsx0ZovhY BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
*,Sa*-7( BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
`m-7L BOOL InitHotkey();
E~`<n]{G-C BOOL UnInit();
?b?YiK&yz #endif
AN+S6t Gyy?cn6_ //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
-K0!wrKC #include "stdafx.h"
YvFt*t
#include "hook.h"
}J_#N.y #include <windowsx.h>
#$u7:p
[t #ifdef _DEBUG
^dKtUH/78G #define new DEBUG_NEW
(q=),3/<pU #undef THIS_FILE
P?<G:]W static char THIS_FILE[] = __FILE__;
nOU.=N
v` #endif
*YP;HL #define MAX_KEY 100
H) q_9<; #define CTRLBIT 0x04
{BD G;e #define ALTBIT 0x02
x,QXOh\a #define SHIFTBIT 0x01
Jy-V\.N>s #pragma data_seg("shareddata")
8LGNV&Edg HHOOK hHook =NULL;
!4T7@V`G UINT nHookCount =0;
N?c!uO|h| static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
+LaR_n[ static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
}i9VV+L#1 static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
G]gc*\4 static int KeyCount =0;
9@ :QBe3] static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
F7JF1HfCP #pragma data_seg()
p u[S HINSTANCE hins;
u9R@rQ9r void VerifyWindow();
KH9D}, BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
=L,7~9 //{{AFX_MSG_MAP(CHookApp)
@}_Wl<kn // NOTE - the ClassWizard will add and remove mapping macros here.
Z':w
X // DO NOT EDIT what you see in these blocks of generated code!
%kV #UzL //}}AFX_MSG_MAP
4X$|jGQ\ END_MESSAGE_MAP()
_{?-=<V'_ m 8P`n CHookApp::CHookApp()
j2=|,AmC {
n?8xRaEf // TODO: add construction code here,
1oL3y;>iL // Place all significant initialization in InitInstance
luCwP }
B[r04YGh RFLw)IWkL_ CHookApp theApp;
G`,M?lmL LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
A{ . A1 {
]Tn""3#1g BOOL bProcessed=FALSE;
mh,a}bX{ if(HC_ACTION==nCode)
NoT%z$1n {
Dn+hI_"#_ if((lParam&0xc0000000)==0xc0000000){// Key up
>]ZW.?1h switch(wParam)
u Qz!of%x {
9QEK|x`8 case VK_MENU:
;~( yv|f6 MaskBits&=~ALTBIT;
]eo%eaA break;
HEe_K!_ case VK_CONTROL:
N$<R6DU]K MaskBits&=~CTRLBIT;
J(Zz^$8]<? break;
v`r*Yok;` case VK_SHIFT:
|L(h+/>aWX MaskBits&=~SHIFTBIT;
l|K$6>80 break;
iB5'mb* default: //judge the key and send message
%ZGG6Xgw break;
C\}M_MD }
#2?3B for(int index=0;index<MAX_KEY;index++){
\ 9#X]H if(hCallWnd[index]==NULL)
jh/aK_Q,w continue;
.:B;%* if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
NPLJ*uHH {
Dh)(?"^9A SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
!Mj28 bProcessed=TRUE;
yMJ(Sf }
=!DpW VsQ }
-BEd7@?A }
xtzkgb,0[ else if((lParam&0xc000ffff)==1){ //Key down
U i`#B switch(wParam)
>lF@M- {
{ukQBu#}< case VK_MENU:
!twYjOryH[ MaskBits|=ALTBIT;
N;i\.oY
break;
/NQ
PTr case VK_CONTROL:
=JN{j2xY MaskBits|=CTRLBIT;
UZJ#/x5F break;
wnHfjF case VK_SHIFT:
aA'of>'ib| MaskBits|=SHIFTBIT;
D|IS@gWa break;
__`6 W1 default: //judge the key and send message
S%df'bh$ break;
q5\iQ2f{WV }
EAK[2?CY for(int index=0;index<MAX_KEY;index++)
!k!1h%7q {
Koc5~qUY] if(hCallWnd[index]==NULL)
Dfy=$:Q continue;
jt3=<&*Bm if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
_3q}K {
"&@{f:+ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
K<MWiB& bProcessed=TRUE;
=LKf.@]# }
^S W0+O }
B{>x }
4++p K;I if(!bProcessed){
u]&+TR for(int index=0;index<MAX_KEY;index++){
eZ{Ce.lNR if(hCallWnd[index]==NULL)
bmO(tQS$5 continue;
I6PReVIb if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
qD,/Qu62 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
Dw<bLSaW& }
xMFEeSzl>S }
sCE%./h] }
g1) ZjABV return CallNextHookEx( hHook, nCode, wParam, lParam );
{TaYkuWS }
F[>Y8e<[ nBwDq^ BOOL InitHotkey()
D+{&zo {
~#7uNH2 if(hHook!=NULL){
H/ar:j nHookCount++;
|mT1\O2a return TRUE;
o^b5E=?>C }
NYc ;Zwv9 else
PCnu?e3F hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
g9j&\+h^ if(hHook!=NULL)
wxy@XN"/i+ nHookCount++;
-Sa-eWP return (hHook!=NULL);
z-h?Q4; }
$f+cd8j?o BOOL UnInit()
2Q;rSe._` {
C=JS]2W2 if(nHookCount>1){
Wu'9ouw! nHookCount--;
A[uB)wWsn return TRUE;
Jv?EV,S/e }
.TNGiUzG BOOL unhooked = UnhookWindowsHookEx(hHook);
?nZe.z-%6 if(unhooked==TRUE){
gnw">H nHookCount=0;
~bz$] o-< hHook=NULL;
9K-,#a }
RV%)~S@!R return unhooked;
sW76RKX8 }
?0+N M9?f`9 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
F:8@ ]tA& {
Q+s2S>U{v BOOL bAdded=FALSE;
d=dHY(ms] for(int index=0;index<MAX_KEY;index++){
eu'~(_2 if(hCallWnd[index]==0){
ahFK^ #s hCallWnd[index]=hWnd;
dnkHx HotKey[index]=cKey;
Vze vOS HotKeyMask[index]=cMask;
S_38U bAdded=TRUE;
]d.e(yCuE KeyCount++;
(6&"(}Pai break;
O)D$UG\< }
Xh }G=1} }
6VLo4bq 5
return bAdded;
,h<xY> }
pUa\YO1J yatZAl(B BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
M5 ^qc {
Nw1Bn~yx<R BOOL bRemoved=FALSE;
3AAciMq} for(int index=0;index<MAX_KEY;index++){
`nY.&YT if(hCallWnd[index]==hWnd){
()5X<=i if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
=]1cVnPI hCallWnd[index]=NULL;
&joP-!" HotKey[index]=0;
k]~$AaNq HotKeyMask[index]=0;
Hz%<V*\{ bRemoved=TRUE;
r 5t{I2 KeyCount--;
4RfBXVS break;
]}n|5 }
ZO>)GR2S }
[}l#cG6 k }
RDEK=^J return bRemoved;
c )=a;_h }
4vV\vXT * 4j(`koX_ void VerifyWindow()
WJMmt XO {
2w fkXS=~6 for(int i=0;i<MAX_KEY;i++){
^tIYr<I if(hCallWnd
!=NULL){ rPt
if(!IsWindow(hCallWnd)){ PsOq-
hCallWnd=NULL; }zqo<o
HotKey=0; 4BeHj~~
HotKeyMask=0; $F NH:r<
KeyCount--; N%%trlDXD
} Lcf?VV}
} U2CC#,b!(
} 8fktk?|
} q/ (h{cq
Y*IKPnPot2
BOOL CHookApp::InitInstance() ,aIkiT
{ `G%h=rr^c
AFX_MANAGE_STATE(AfxGetStaticModuleState()); %evtIU<h
hins=AfxGetInstanceHandle(); kSEgq<i!
InitHotkey(); 4p%^?L?
return CWinApp::InitInstance(); x,|fblQz
} trB-(B%5
VF g(:
int CHookApp::ExitInstance() .[Qi4jm>`
{ .&I!2F
VerifyWindow(); b_7LSp
UnInit(); ~(B%E'
return CWinApp::ExitInstance(); "=LeHY=9
} W }v
,6Oe
c'mg=jH
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file \:+ NVIN
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) =woP~+
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ dI>cPqQ
#if _MSC_VER > 1000 bh#6yvpMR
#pragma once db&!t!#,
#endif // _MSC_VER > 1000 \S&OAe/b
YMVi7D~;Q$
class CCaptureDlg : public CDialog D1@yW}
4
{ |<O^M q
// Construction F{rC{5@fj
public: *9aI\#}
BOOL bTray; uGHM ]"!)
BOOL bRegistered; v=Q!ioE7
BOOL RegisterHotkey(); 2p4iir
UCHAR cKey; -*OL+
UCHAR cMask; 1hzf+*g
void DeleteIcon(); z, FPhbFn
void AddIcon(); 1/&^~'
UINT nCount; J#jFX
F\
void SaveBmp(); xM@s`s|n
CCaptureDlg(CWnd* pParent = NULL); // standard constructor Y*{5'q+2
// Dialog Data c
*<m.
//{{AFX_DATA(CCaptureDlg) btC6R>0
enum { IDD = IDD_CAPTURE_DIALOG }; +KWO`WR
CComboBox m_Key; 6/ T/A+u
BOOL m_bControl; P&<NcOCL&
BOOL m_bAlt; Onou:kmf1
BOOL m_bShift; $s-B
CString m_Path; v`G}sgn
CString m_Number; lCBH3-0^
//}}AFX_DATA *{5/" H5
// ClassWizard generated virtual function overrides ;=k{[g 'gv
//{{AFX_VIRTUAL(CCaptureDlg) -yb7s2o
public: kD7'BP/#
virtual BOOL PreTranslateMessage(MSG* pMsg); )rlkQ'DN
protected: QpRk5NeLe
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support H9(UzyN>i
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); W39J)~D^@
//}}AFX_VIRTUAL 6q!Q([D_
// Implementation o6:bmKWE
protected: ] SLeWs
HICON m_hIcon; AEDBr <
// Generated message map functions 6y57m;JW/
//{{AFX_MSG(CCaptureDlg) (ti!Y"e2
virtual BOOL OnInitDialog(); o*2Mjd]r
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); #p]V?
afx_msg void OnPaint(); uy~$
:0o
afx_msg HCURSOR OnQueryDragIcon(); R(,m!
virtual void OnCancel(); wXZ9@(^
afx_msg void OnAbout(); L3'isaz&^
afx_msg void OnBrowse(); WFhppi
afx_msg void OnChange(); 9W_mSum
//}}AFX_MSG qnnRS
DECLARE_MESSAGE_MAP() 94|ZY}8|f
}; W]_a_5
#endif
HKJ^6|'
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////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file NU+PG`Vb
#include "stdafx.h" y>#kT
#include "Capture.h" \I^"^'CP
#include "CaptureDlg.h" y7+n*|H
#include <windowsx.h> D:?"Rf{)
#pragma comment(lib,"hook.lib") e@S$[,8
#ifdef _DEBUG Sw$/Z)1K&
#define new DEBUG_NEW Nl/
fvJ`4
#undef THIS_FILE H q?F @X
static char THIS_FILE[] = __FILE__; ?L H[,8z
#endif
cfRUVe
#define IDM_SHELL WM_USER+1 N}<!k#d
E
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ~4Mz:h^
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); g0 ;;+z
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ld):Am}/o
class CAboutDlg : public CDialog EwgNd Gcj
{ S3$C#mHX
public: Om>?"=yD E
CAboutDlg(); g{uiY|
// Dialog Data )EQI>1_
//{{AFX_DATA(CAboutDlg) CfD4m,6
enum { IDD = IDD_ABOUTBOX }; FP7N^HVBG=
//}}AFX_DATA #<U@SMv
// ClassWizard generated virtual function overrides 9ZR"Lo>3e+
//{{AFX_VIRTUAL(CAboutDlg) _qpIdQBo
protected: >{-rl@^H:
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 6ecx!uc$
//}}AFX_VIRTUAL )8'v@8;-
// Implementation vILB$%I
protected: UH;bg}=8
//{{AFX_MSG(CAboutDlg) a`]ZyG*P
//}}AFX_MSG -[pfLo
DECLARE_MESSAGE_MAP() ^eefR5^_w
}; ,\#j6R,{I
kmo#jITa`
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ' V*}d
{ w7Mh8'P54
//{{AFX_DATA_INIT(CAboutDlg) |9Yx`_DF
//}}AFX_DATA_INIT l-!"
} KK]R@{ r
-nX{&Z3-s
void CAboutDlg::DoDataExchange(CDataExchange* pDX) dM19;R@4
{ bY*_6SPK4
CDialog::DoDataExchange(pDX); |id7@3leu
//{{AFX_DATA_MAP(CAboutDlg) 6#Y]^%?uy
//}}AFX_DATA_MAP <<Y]P+uU
} #pPR>,4
E[=&6T4
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) w (X}
//{{AFX_MSG_MAP(CAboutDlg) *CAz_s<
// No message handlers .y_ ~mr&d
//}}AFX_MSG_MAP )"|wWu
END_MESSAGE_MAP() nD>X?yz2
:_2:Fh.}3~
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Dq9f Fe
: CDialog(CCaptureDlg::IDD, pParent) hkV*UH{
{ W<[7LdAB
//{{AFX_DATA_INIT(CCaptureDlg) o8IqO'
m_bControl = FALSE; 5p:2gsk
m_bAlt = FALSE; -]Mk}
z$
m_bShift = FALSE; GukwN]*OY
m_Path = _T("c:\\"); VkJTcC:1
m_Number = _T("0 picture captured."); X7:Dw]t
nCount=0; +l!.<:sp
bRegistered=FALSE; ,zH\P+*
bTray=FALSE; 3,{;wJ
Z
//}}AFX_DATA_INIT 3[l\l5'm8
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ";jAH GbO
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); v&%W*M0q@
} xdY'i0fh
I$)9T^Ra
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) wdV)M?
{ 0"+QWh
CDialog::DoDataExchange(pDX); QJ>=a./
//{{AFX_DATA_MAP(CCaptureDlg) hp}rCy|01
DDX_Control(pDX, IDC_KEY, m_Key); {!{T,_ J
DDX_Check(pDX, IDC_CONTROL, m_bControl); /X#OX8gb]
DDX_Check(pDX, IDC_ALT, m_bAlt); I\rjw$V#
DDX_Check(pDX, IDC_SHIFT, m_bShift); 9ao?\]&t
DDX_Text(pDX, IDC_PATH, m_Path); f(K1,L:&7
DDX_Text(pDX, IDC_NUMBER, m_Number); )=aqj@v
//}}AFX_DATA_MAP */TO$ ^s
} A e2Y\ sAV
<S;YNHLC
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) XRyeEwA;pp
//{{AFX_MSG_MAP(CCaptureDlg) m9jjKu]|
ON_WM_SYSCOMMAND() ;i+(Q%LO
ON_WM_PAINT() `Pwf?_2n-
ON_WM_QUERYDRAGICON()
2)n%rvCQ
ON_BN_CLICKED(ID_ABOUT, OnAbout) Gz8JOl
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) LUz`P6
ON_BN_CLICKED(ID_CHANGE, OnChange) Pl#u,Y
//}}AFX_MSG_MAP L=s8em]7l
END_MESSAGE_MAP() Bxj4rC[
?V_v=X%w
BOOL CCaptureDlg::OnInitDialog() F^TOLwix
{ G4#Yz6O
CDialog::OnInitDialog(); -~lrv#5Q
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); !VrBoU4<d
ASSERT(IDM_ABOUTBOX < 0xF000); !}1l8Y
CMenu* pSysMenu = GetSystemMenu(FALSE); y] Cx[
if (pSysMenu != NULL) ]#q$i[Y
{ Aqg$q* Y
CString strAboutMenu; ?9 `T_,
strAboutMenu.LoadString(IDS_ABOUTBOX); SL^%Zh/~
if (!strAboutMenu.IsEmpty()) kjQI=:i=
{ AP=SCq;
pSysMenu->AppendMenu(MF_SEPARATOR); cmaha%3d
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); qPhVc9D#
} AO5a
} HJ!)&xT
SetIcon(m_hIcon, TRUE); // Set big icon Esg:
SetIcon(m_hIcon, FALSE); // Set small icon 2elj@EB,M
m_Key.SetCurSel(0); F[.IF5_
RegisterHotkey(); 2Y=Q%
CMenu* pMenu=GetSystemMenu(FALSE); "[Tr"nI
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Kj6+$l
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 6e}T
zc\@(
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); A?)(^
return TRUE; // return TRUE unless you set the focus to a control nRX<$OzTV
} 3z8zZ1uzU
l|9'l[}&
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) +,D82V7S
{ WCp[6g&%O
if ((nID & 0xFFF0) == IDM_ABOUTBOX) PM {L}tEQ
{ :X*uE^bH
CAboutDlg dlgAbout; l?;ReK.r
dlgAbout.DoModal(); y92<(ziaX)
} >4#\ U!
else u9+)jN<Yh
{ jar?"o
CDialog::OnSysCommand(nID, lParam); mj9]M?]
} :4COPUBpPV
} \D[~54
L;KLmxy#
void CCaptureDlg::OnPaint() 9@*4^Ks p
{ -OfAl~ 4
if (IsIconic()) ?C6`
{ \OK}DhY#
CPaintDC dc(this); // device context for painting PKs$Q=Ol<|
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ({!*&DVu
// Center icon in client rectangle |txzIc.#
int cxIcon = GetSystemMetrics(SM_CXICON); '_g*I
int cyIcon = GetSystemMetrics(SM_CYICON); uuCVI2|
CRect rect; ,l\D@<F
GetClientRect(&rect); M49Hm[0(
int x = (rect.Width() - cxIcon + 1) / 2; VC!g,LU|-
int y = (rect.Height() - cyIcon + 1) / 2; b1ZHfe:
// Draw the icon 2Ju,P_<dt
dc.DrawIcon(x, y, m_hIcon); 6|%HCxWO
} Ax!fvcsN
else O}7aX '
{ 8}^ym^H|j
CDialog::OnPaint(); |e3YTLsI
} RWn#"~
} MpJx>0j/J
[@s5v
HCURSOR CCaptureDlg::OnQueryDragIcon() B_.>Q8tK;
{ / pR,l5
return (HCURSOR) m_hIcon;
'FN3r
} r8L'C
^}GR!990
void CCaptureDlg::OnCancel() H329P*P
{ yhyh\.
if(bTray) )#Y:Bj7H@2
DeleteIcon(); P~"""3de4
CDialog::OnCancel(); xtp55"g
} KV'-^\
2Xfy?U
void CCaptureDlg::OnAbout() q.lh
{ 'wTJX>
CAboutDlg dlg; =iPQ\_ON@
dlg.DoModal(); ]}AyDy6C
} v8A{q
QOF'SEq"k
void CCaptureDlg::OnBrowse() E__A1j*gd
{ 83"C~xe?p4
CString str; hM`*-+Zb
BROWSEINFO bi; 5{8,+
Z
char name[MAX_PATH]; <NM Os"NB
ZeroMemory(&bi,sizeof(BROWSEINFO)); UgLJV2M6
bi.hwndOwner=GetSafeHwnd(); mHC36ba
bi.pszDisplayName=name; GJuU?h#:/{
bi.lpszTitle="Select folder"; ;V1e>?3
bi.ulFlags=BIF_RETURNONLYFSDIRS; )i>T\B
LPITEMIDLIST idl=SHBrowseForFolder(&bi); DZ|/#- k
if(idl==NULL) 3bB%@^<
return; gH/k}M7tA#
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); )$I"LyK)
str.ReleaseBuffer(); ~bJ*LM?wOP
m_Path=str; gJBk&SDgtP
if(str.GetAt(str.GetLength()-1)!='\\') *yA.D?
m_Path+="\\"; Bk~M ^AK@~
UpdateData(FALSE); .'N#qs_
} 2E3x=
G{oM2`c'#8
void CCaptureDlg::SaveBmp() p&;,$KDA
{ :~9F/Jx
CDC dc; w9a6F
dc.CreateDC("DISPLAY",NULL,NULL,NULL); MT@Uu
CBitmap bm; SkA"MhX
int Width=GetSystemMetrics(SM_CXSCREEN); rx;zd ?
int Height=GetSystemMetrics(SM_CYSCREEN); k$} 6Qd
bm.CreateCompatibleBitmap(&dc,Width,Height); WR"p2=
CDC tdc; mdHC{sp
tdc.CreateCompatibleDC(&dc); aMjCqu05
CBitmap*pOld=tdc.SelectObject(&bm); jl4rEzVu
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); bjq2XP?LL
tdc.SelectObject(pOld); \(ZOt.3!J
BITMAP btm; t \C[mw
bm.GetBitmap(&btm); YY<e]CriU
DWORD size=btm.bmWidthBytes*btm.bmHeight; Q /\Hc
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); K?+Rq
BITMAPINFOHEADER bih; `{I-E5x
bih.biBitCount=btm.bmBitsPixel; .c.#V:XZ#U
bih.biClrImportant=0; ;rH@>VrR
bih.biClrUsed=0; c}FZb$q#
bih.biCompression=0; Yt;.Z$i ,
bih.biHeight=btm.bmHeight; tI(co5 W
bih.biPlanes=1; .{W)E
bih.biSize=sizeof(BITMAPINFOHEADER); sWnU*Q
bih.biSizeImage=size; YEqWTB|w
bih.biWidth=btm.bmWidth; Bhrp"l
+|
bih.biXPelsPerMeter=0; :!Tb/1
bih.biYPelsPerMeter=0; v4Q8RE?
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); /=qn1
static int filecount=0; >j$CM:w
CString name; \D
#NO
name.Format("pict%04d.bmp",filecount++); g @lAk%V4
name=m_Path+name; =>6'{32W_
BITMAPFILEHEADER bfh; 89)rss
bfh.bfReserved1=bfh.bfReserved2=0; #VEHyz 6P
bfh.bfType=((WORD)('M'<< 8)|'B'); I2'UC)
0
bfh.bfSize=54+size; _sCpyu
bfh.bfOffBits=54; 2xd G&}$fa
CFile bf; P1ab2D
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ "L" 6jT
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); W7"ks(
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); oFV>b
bf.WriteHuge(lpData,size); vH#^ |u
bf.Close(); Ofg-gCF8
nCount++; +d736lLe%
} Sc*O_c3D
GlobalFreePtr(lpData); fm\IQqIK%
if(nCount==1) YX_p3
m_Number.Format("%d picture captured.",nCount); ,tL<?6_
else cf0Dq~G
m_Number.Format("%d pictures captured.",nCount); 8+1tys
UpdateData(FALSE); 7>J8\=
} #\$R^u]!
5!G}*u.
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) I%whM~M1+
{ 3say&|kJ
if(pMsg -> message == WM_KEYDOWN) LdAfY0
{ "tbKKh66
if(pMsg -> wParam == VK_ESCAPE) b#^UP
return TRUE; ;,]T|>M
if(pMsg -> wParam == VK_RETURN) jxr~cp?4
return TRUE; 8:,l+[\
} ]|[oL6"
return CDialog::PreTranslateMessage(pMsg); Hay`lA2@
} fG5 U' Vw
m$:o+IH/
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) b{t'Doe
{ }cG!93
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 7!`,P
SaveBmp(); snV,rZ
return FALSE; s7<x~v+^
} _}7N,Cx
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ =x~HcsJ8!R
CMenu pop; +)FB[/pXk
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); W9?Vh{w
CMenu*pMenu=pop.GetSubMenu(0); T'l >$6
pMenu->SetDefaultItem(ID_EXITICON); {ls$#a+d
CPoint pt; gfs?H #
GetCursorPos(&pt); 'kK}9VKl
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Y`3>i,S6\
if(id==ID_EXITICON) 'k#^Z
DeleteIcon(); ucyz>TL0
else if(id==ID_EXIT) FMuM:%&J]
OnCancel(); {|6(_SM|
return FALSE; m-UI^M,@<
} [dL4u^]{
LRESULT res= CDialog::WindowProc(message, wParam, lParam); :0j9
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 2*5Z|
3aX
AddIcon(); ~w'M8(
return res;
WLEjRx
} uHUicZf.
V7!x-E/
void CCaptureDlg::AddIcon() C9U~lcIS
{ *S_eYKSl
NOTIFYICONDATA data; Dg4?,{c9W
data.cbSize=sizeof(NOTIFYICONDATA); :~pPB#)nk
CString tip; m0W5O gk
tip.LoadString(IDS_ICONTIP); 1+PLj[;jJ:
data.hIcon=GetIcon(0); <DCrYt!1}c
data.hWnd=GetSafeHwnd(); %^g BDlR^
strcpy(data.szTip,tip); }N1Z7G
data.uCallbackMessage=IDM_SHELL; jx&pRjP
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; #z) @T
data.uID=98; i3*S`/]p
Shell_NotifyIcon(NIM_ADD,&data); ";cWK29\f
ShowWindow(SW_HIDE); [:
X
bTray=TRUE; *BT-@V.4
} =usx' #rb
r"SuE:D
void CCaptureDlg::DeleteIcon() yK<%AV@v
{ utC]GiR
NOTIFYICONDATA data; 6)kF!/J
data.cbSize=sizeof(NOTIFYICONDATA); b/ h,qv
data.hWnd=GetSafeHwnd(); oBQr6-nZ
data.uID=98; 4,T!zT6&
Shell_NotifyIcon(NIM_DELETE,&data); E@aR5S>
ShowWindow(SW_SHOW); &+=A;Y)
SetForegroundWindow(); EUU9JnQhBJ
ShowWindow(SW_SHOWNORMAL); C+$dm)M/q
bTray=FALSE; iK1<4)
} 1K&z64Q5J
[J0L7p*6
void CCaptureDlg::OnChange() Y!v `0z
{ tB4- of3+
RegisterHotkey(); a5:Q%F<!
}
%lAJ]$m
? r=cLC
BOOL CCaptureDlg::RegisterHotkey()
SEF/D0
{ H?8KTl=e
UpdateData(); JNRG[j
UCHAR mask=0;
DHJh.Y@H
UCHAR key=0; iTi<X|X
if(m_bControl) IM}T2\tZ}
mask|=4; p
mcy(<
if(m_bAlt) 8l0%:6XbI
mask|=2; gd-4hR
if(m_bShift) /Ws@YP
mask|=1; *;8tj5du
key=Key_Table[m_Key.GetCurSel()]; oori t
if(bRegistered){ T+zZOI
DeleteHotkey(GetSafeHwnd(),cKey,cMask); |f&)@fUI
bRegistered=FALSE; .R;HH_
} UHF.R>Ry
cMask=mask; &aldnJ
cKey=key; /pZLt)=P
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); F`3c uL[N
return bRegistered; dX: (%_Mn
} R4u=.
0#KDvCBJ
四、小结 mdR:XuRD"t
|S|0'C*
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。