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:
DLZ63'
omP7| 一、实现方法
VZR6oia :+$_(*Z 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
>=Veu; A 0IuU4h5Fr #pragma data_seg("shareddata")
OYy8u{@U: HHOOK hHook =NULL; //钩子句柄
9,+LNZ'k UINT nHookCount =0; //挂接的程序数目
m%puD9 static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
c7_b^7h1 static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
:Fl: bRH+ static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
(fS4qz:&l static int KeyCount =0;
_`58G#z static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
tnntHQ&b #pragma data_seg()
P)
#rvTDRw 4e sf&-gG 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
`h#JDcT;a 0c)19Ig DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
YQJ_t@0C []NAV BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
QH:i)v* cKey,UCHAR cMask)
~Tolz H! {
;$]R#1i44 BOOL bAdded=FALSE;
lM]7@A for(int index=0;index<MAX_KEY;index++){
a*`J]{3G if(hCallWnd[index]==0){
$[e*0!e hCallWnd[index]=hWnd;
r@aFB@ HotKey[index]=cKey;
S7R^%Wck/6 HotKeyMask[index]=cMask;
WObfHAp. bAdded=TRUE;
.H"gH-I KeyCount++;
V-57BKeDz break;
( ;q$cKy }
N]~q@x;<)3 }
fpUX
@b return bAdded;
"]%
L{aP }
j*nCIxF //删除热键
^z1WPI BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
WqAP'x 1 {
Bvwk6NBN BOOL bRemoved=FALSE;
3.Qwn. for(int index=0;index<MAX_KEY;index++){
Z1zC@z4sUj if(hCallWnd[index]==hWnd){
I|hG"i if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
=`")\?z} hCallWnd[index]=NULL;
BDA\9m^3 HotKey[index]=0;
@ggM5mm HotKeyMask[index]=0;
F6Ixu_s bRemoved=TRUE;
.u)YZN0\ KeyCount--;
5UqCRz<,R break;
<e"2<qVi }
XOoND }
(1R, }
99x]DY return bRemoved;
x<].mx }
SVJ3!1B, *|cvx:GO \y=,=;yv DLL中的钩子函数如下:
e_e|t>nQ 'ga@=;Wj LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
KMv|;yXYj4 {
iJAW| dw} BOOL bProcessed=FALSE;
^,50]uX_ if(HC_ACTION==nCode)
@/~41\=e {
Q"\[ICu!, if((lParam&0xc0000000)==0xc0000000){// 有键松开
,}<v:! switch(wParam)
/#HY-b {
2w%1\TcB$ case VK_MENU:
HV>W f"1 MaskBits&=~ALTBIT;
CUoMB r break;
MTQdyTDHl case VK_CONTROL:
sfH|sp MaskBits&=~CTRLBIT;
r\yj$Gu>( break;
)pJzw-m" case VK_SHIFT:
?tOzhrv MaskBits&=~SHIFTBIT;
;2$^=:8 break;
WWY9U default: //judge the key and send message
F4@h}T5) break;
][9M_. }
G[jCmkK for(int index=0;index<MAX_KEY;index++){
hFKYRZtP.8 if(hCallWnd[index]==NULL)
nBQG.3 continue;
VFyt9:a if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
IV\@GM:ait {
m{' q(w} SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
}b44^iL$9y bProcessed=TRUE;
tNtP+v-{ }
e3[N#ryt }
'tOo0Zgc }
9yQ[ *
else if((lParam&0xc000ffff)==1){ //有键按下
b"J(u|Du` switch(wParam)
\Ew2@dF{O {
0tA+11Iu case VK_MENU:
B^oXUEOImq MaskBits|=ALTBIT;
% 'P58 break;
z E{.oi case VK_CONTROL:
*Owq_)_(| MaskBits|=CTRLBIT;
UO</4WJ break;
K[sfsWQ. case VK_SHIFT:
D[<8(~VP MaskBits|=SHIFTBIT;
!j- 7, break;
>:s:`Au default: //judge the key and send message
xi-^_I break;
<K)^MLgN }
")TI,a` for(int index=0;index<MAX_KEY;index++){
)y8$-"D(it if(hCallWnd[index]==NULL)
s+4G`mq>* continue;
i~4:]r22 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
>XA#/K {
QkA79%;j SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
@o8\`G bProcessed=TRUE;
.L8S_Mz }
H -`7T;t~ }
DS^PHk39 }
hD;[}8qN{ if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
|d8/ZD for(int index=0;index<MAX_KEY;index++){
2/I^ :*e if(hCallWnd[index]==NULL)
Pb!kl # continue;
98A ; R if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
Zl]\sJ1" SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
cU+/I>V //lParam的意义可看MSDN中WM_KEYDOWN部分
#Ez>]`]TB }
($]y*|Obn }
9NVe>\s_ }
fAJQ8nb{@] return CallNextHookEx( hHook, nCode, wParam, lParam );
'9-8_; }
.F9>|Xx[ D\>CEBt 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:
S&9{kt|BI i_V~SC` BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
55fV\3F|R BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
C^.:{ W0X?"Ms|a 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:
]^"*Fdn TR]~r2z LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
'Exj|Y& {
POdG1;) if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
nKch_Jb {
8LB+}N(8f //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
|eJ4"OPC SaveBmp();
lQldW|S> return FALSE;
oC"c%e8 }
*l^h;RSx …… //其它处理及默认处理
&p0*:(j }
10{ZW@!7 kpcIU7|e GKSfr8US4 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。
8 yQjB-,# 2BEF8o]Np 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。
90&ld :97 In5'(UHW: 二、编程步骤
GAV|x]R /`3<@{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";
36e!je #"=_GA^.{ 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
"^yTH/m ggfL
d r 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;
?u"MsnCXYn Kr!8H/Z 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;
Xh;Pbm|K t(}\D]mj 5、 添加代码,编译运行程序。
R6*:Us0\FJ Pqi>,c<&mL 三、程序代码
\XD&0inv rXdI`l# ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
r1]shb%J? #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
JiCDY)bu #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
Q
>] v?4 #if _MSC_VER > 1000
F`r=M%yh #pragma once
4#!NVI3t #endif // _MSC_VER > 1000
5Z,^46J #ifndef __AFXWIN_H__
W/OZ}ky}^ #error include 'stdafx.h' before including this file for PCH
](vOH#E #endif
QD-#sU]
#include "resource.h" // main symbols
({87311% class CHookApp : public CWinApp
7FMO''x {
aHvTbpJ public:
7'k+/rAO CHookApp();
(%D*S_m' // Overrides
5v<BB`XWp // ClassWizard generated virtual function overrides
_0<qS{RW //{{AFX_VIRTUAL(CHookApp)
XOAZ public:
.A//Q|ot! virtual BOOL InitInstance();
<: f jWy virtual int ExitInstance();
dnSjXyjFB //}}AFX_VIRTUAL
a39Kl_\ //{{AFX_MSG(CHookApp)
"WV]|
TS"] // NOTE - the ClassWizard will add and remove member functions here.
q4C$-W%rj // DO NOT EDIT what you see in these blocks of generated code !
HNu/b)-Rb //}}AFX_MSG
<p;cR` %uE DECLARE_MESSAGE_MAP()
[/.o>R#J( };
be}^}w= LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
WgF
Xv@Jjt BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
T1.`*,t)= BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
u|z B\zd BOOL InitHotkey();
$fR[zBxA BOOL UnInit();
Y<0
[_+( #endif
/:iO:g1 a=>PGriL //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
ZaBGkDX5 #include "stdafx.h"
3iMh)YH5b #include "hook.h"
ov.7FZ+ #include <windowsx.h>
6&5p3G{%0 #ifdef _DEBUG
I4.^I/c( #define new DEBUG_NEW
x'tYf^Va28 #undef THIS_FILE
n$i}r\
so static char THIS_FILE[] = __FILE__;
bX23F? #endif
\#Ez["mD
#define MAX_KEY 100
t:X\`.W #define CTRLBIT 0x04
]{;=<t6 #define ALTBIT 0x02
?{ns1nW: #define SHIFTBIT 0x01
dOh`F~
Y)e #pragma data_seg("shareddata")
EW7heIT$ HHOOK hHook =NULL;
()i8 Qepo} UINT nHookCount =0;
;"l>HL:^ static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
t&MJSFkiA static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
Z<T%:F static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
Ke@zS9 static int KeyCount =0;
#Y6'Q8gf static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
Lwm2:_\_b #pragma data_seg()
cPZD#";f HINSTANCE hins;
)>abB?RZ void VerifyWindow();
:yO.Te
F BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
LT']3w //{{AFX_MSG_MAP(CHookApp)
l(
/yaZ` // NOTE - the ClassWizard will add and remove mapping macros here.
^dj
avJ // DO NOT EDIT what you see in these blocks of generated code!
O+ ~.p //}}AFX_MSG_MAP
xcz[w}{eEq END_MESSAGE_MAP()
,g\%P5 !B_i~Rmg CHookApp::CHookApp()
,R_ KLd {
rw/WD( // TODO: add construction code here,
x2/L`q"M?= // Place all significant initialization in InitInstance
})f4`$qf }
L8sHG$[ JFf*v6:, CHookApp theApp;
@5jJoy(mX@ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
AdMA|!|:hc {
\}[{q BOOL bProcessed=FALSE;
jp?;8rS3 if(HC_ACTION==nCode)
*<Yn {
'S]7:/CI if((lParam&0xc0000000)==0xc0000000){// Key up
mv_N ns switch(wParam)
'_!j9A]g {
Q[+&n* case VK_MENU:
tCH4-~,# MaskBits&=~ALTBIT;
OW!cydA- break;
SUwSZ@l^| case VK_CONTROL:
~7a(KJgvd" MaskBits&=~CTRLBIT;
GZXBzZ} break;
RQiGKz5
case VK_SHIFT:
,w&8 &wj MaskBits&=~SHIFTBIT;
/cM< break;
S?_/Po| default: //judge the key and send message
e}>8rnR{ break;
[ aC7 }
M5DQ{d<r for(int index=0;index<MAX_KEY;index++){
mkH{%7n if(hCallWnd[index]==NULL)
l,5<g-r
V continue;
l+g\xUP if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
A<-Prvryt {
5=]q+&y\H SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
r#ES| bProcessed=TRUE;
xDv5'IGBb }
6M^P]l }
baJ(Iy$XT }
".aypD)W else if((lParam&0xc000ffff)==1){ //Key down
tg%s#lLeH switch(wParam)
CFdR4vuEI {
a![x^@nF case VK_MENU:
pd2Lc
$O@ MaskBits|=ALTBIT;
d67Q@')00 break;
bV|(V> case VK_CONTROL:
oj\av~cI MaskBits|=CTRLBIT;
4JF)w;X} break;
mHcxK@qw case VK_SHIFT:
?z,^QjQ} MaskBits|=SHIFTBIT;
IRy!8A=X break;
K6"#&0 default: //judge the key and send message
::bK{yZm break;
c
*<"& }
44;ZX$HL for(int index=0;index<MAX_KEY;index++)
`
O;+N"v {
?S&pq? if(hCallWnd[index]==NULL)
VK)1/b=yT continue;
7g@P$e] if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
fT)u`voE, {
ia=eFWt. SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
s>y=-7:N bProcessed=TRUE;
P=v 0|Y*q| }
kT|{5Kn&s }
x0aPY;,N0 }
=~;SUO if(!bProcessed){
?1%/G< for(int index=0;index<MAX_KEY;index++){
8z,i/: if(hCallWnd[index]==NULL)
:5 XNV6^| continue;
'nH/Z 84 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
(Uk1Rt*h SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
eteq Mg}M }
xDtq@Rb} }
=apcMW(zn }
|.kYomJ return CallNextHookEx( hHook, nCode, wParam, lParam );
Hj&mwn] }
+%yVW f !YUMAp/ BOOL InitHotkey()
*5KV DOd
{
}*vUOQQp* if(hHook!=NULL){
8Q $fXB nHookCount++;
)na8a! return TRUE;
7PE3>cD }
Vq[L4 else
GJlkEWs hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
r8PXdNg if(hHook!=NULL)
;uw`6 KJ nHookCount++;
p4},xQzB return (hHook!=NULL);
eK]g FXk }
M#v#3:&5 BOOL UnInit()
8S;]]*cD~ {
;O8Uc&:P if(nHookCount>1){
P_:A%T nHookCount--;
l!Bc0 return TRUE;
Z.9?u; }
aDJ\% BOOL unhooked = UnhookWindowsHookEx(hHook);
ziFg+i%s if(unhooked==TRUE){
B^4D`0G[4 nHookCount=0;
j9)WInYc: hHook=NULL;
3@u<Sa }
GE+%V7 return unhooked;
L`"PaIMz }
<PBrW#:' XL@Y! BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
5HWVK . {
CH
|A^!Zm BOOL bAdded=FALSE;
OGmOk>_ for(int index=0;index<MAX_KEY;index++){
Z7 \gj` if(hCallWnd[index]==0){
zk)9tm;i{ hCallWnd[index]=hWnd;
Q_p!;3 HotKey[index]=cKey;
\SB~rz"A HotKeyMask[index]=cMask;
p7.j>w1F bAdded=TRUE;
pz'l9Gp;@ KeyCount++;
\etuIFQ#U break;
hD OEJ }
g? 7% }
7MX nt5qUh return bAdded;
AiUICf?{ }
(e>.hfrs HS1Gy/6' BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
;Od;q]G7L {
a3o4> 9 BOOL bRemoved=FALSE;
x,kZ>^]&b for(int index=0;index<MAX_KEY;index++){
[X >sG)0S~ if(hCallWnd[index]==hWnd){
] r8
hMv if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
" oWiQ{\IP hCallWnd[index]=NULL;
:mwNkT2et HotKey[index]=0;
qw]:oh&G HotKeyMask[index]=0;
,~;_- bRemoved=TRUE;
P38D-fLq KeyCount--;
JE~ci#|! break;
eUiJl6^x }
)ZkQWiP- }
["'0vQ }
M,0@@: return bRemoved;
P\"|b\O1 }
Kv**(~FNnH WU}?8\?U% void VerifyWindow()
\Qa6mt2h {
lYZ5FacqC for(int i=0;i<MAX_KEY;i++){
CuE>=y-"I if(hCallWnd
!=NULL){ _)4YxmK%
if(!IsWindow(hCallWnd)){ t?[|oz:v
hCallWnd=NULL; [Tha
j
HotKey=0; /.leY$
HotKeyMask=0; x50,4J%J'r
KeyCount--; WdXi
} C %l!"s^
} KH4
5A'o
} PA5_
} A0x"Etbw)
|T53m;D
BOOL CHookApp::InitInstance() XwlAW7lU=
{ c*+yJNm3>
AFX_MANAGE_STATE(AfxGetStaticModuleState()); &_Py{Cv@Dw
hins=AfxGetInstanceHandle(); e}qG _*
InitHotkey(); [UJC/GtjS
return CWinApp::InitInstance(); fV[(s7vW
} @=KuoIV
+8+@Az[e0
int CHookApp::ExitInstance() 2FHWOy
/N@
{ 8=
jl]q$<
VerifyWindow(); vRm.#+Td
UnInit(); x"kc:F
return CWinApp::ExitInstance(); uo`O$k<;
} Mx,QgYSu
h-rPLU;Bw
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file _c}@Fi+E
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) R-Y |;
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ *&VH!K#@{
#if _MSC_VER > 1000 -i``yf?P
#pragma once -eKi}e
#endif // _MSC_VER > 1000 &Nx'Nq9y
P19nF[A
class CCaptureDlg : public CDialog E|u#W3-:
{ ~GL"s6C$`;
// Construction $ t' .
public: &V;^xMO!
BOOL bTray; 8nOMyNpy~M
BOOL bRegistered; ,Y~{RgG
BOOL RegisterHotkey(); np|3 os
UCHAR cKey; r3a$n$Qw
UCHAR cMask; #BQ7rF7CNE
void DeleteIcon(); *%JncK'
void AddIcon(); 2#z 6= M~A
UINT nCount; Y9rW_m@B
void SaveBmp(); lWj|7
CCaptureDlg(CWnd* pParent = NULL); // standard constructor K9v@L6pY=
// Dialog Data K/;FP'.
//{{AFX_DATA(CCaptureDlg) -!E ))|A
enum { IDD = IDD_CAPTURE_DIALOG }; g?V>+oMx
CComboBox m_Key; nBs%k!RR
BOOL m_bControl; r3X|*/
BOOL m_bAlt; as\6XW$;Q
BOOL m_bShift; W@NM~+)e
CString m_Path; k/+-Tq;
CString m_Number; u|m>h(O
//}}AFX_DATA [n/'JeG5
// ClassWizard generated virtual function overrides 19od#
d3+
//{{AFX_VIRTUAL(CCaptureDlg) QG\lXY,
public: %x_c2
virtual BOOL PreTranslateMessage(MSG* pMsg); %GUu{n<6
protected: !6_lD0
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support :>gzWVE<
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); dI!x Ai
//}}AFX_VIRTUAL @=o1q=5@8
// Implementation Q9X7-\n
protected: DXPiC[g]
HICON m_hIcon; ,: X+NQ
// Generated message map functions /{pVYY
//{{AFX_MSG(CCaptureDlg) S4]}/Imn)
virtual BOOL OnInitDialog(); 9g3J{pKcZ
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); YDBQ6X
afx_msg void OnPaint(); yYmV^7G
afx_msg HCURSOR OnQueryDragIcon(); ^p#f B4z
virtual void OnCancel(); xEBiBskd
afx_msg void OnAbout(); V$u~}]z
afx_msg void OnBrowse(); ~2xC.DF_N
afx_msg void OnChange(); Pf
s _s6
//}}AFX_MSG {~DYf*RZ
DECLARE_MESSAGE_MAP() [9f
TN2'z
}; k8^!5n
#endif 2kV[A92s
aaq{9Y#
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file H!U\;ny
#include "stdafx.h" $
JI`&
#include "Capture.h" <VD^f
#include "CaptureDlg.h" ?qr-t+
#include <windowsx.h> XWvT(+J
#pragma comment(lib,"hook.lib") 9tmYrhb$
#ifdef _DEBUG <b!ieK?\F3
#define new DEBUG_NEW MCHRNhb9
#undef THIS_FILE %=x|.e@J
static char THIS_FILE[] = __FILE__; Y%9S4be
#endif uN bOtA
#define IDM_SHELL WM_USER+1 IWeQMwg
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); @/}{Trmg/
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); l!f/0Rx5
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; :A35?9E?
class CAboutDlg : public CDialog E@\e37e
{ )|`eCzCB
public: ;\7TQ9z
CAboutDlg(); 6'y+Ev$9
// Dialog Data }49X
N
//{{AFX_DATA(CAboutDlg) ~S}>|q$
enum { IDD = IDD_ABOUTBOX }; 6zs&DOB
//}}AFX_DATA %&KJtKe
// ClassWizard generated virtual function overrides "?_adot5v
//{{AFX_VIRTUAL(CAboutDlg) $Z)Dvy|
protected: XQ.czj
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support zmkqqiDp_
//}}AFX_VIRTUAL v(^{P
// Implementation UJG)-x
protected: Pxu!,Mi[d
//{{AFX_MSG(CAboutDlg) Z;shFMu
//}}AFX_MSG <>GWSW
DECLARE_MESSAGE_MAP() 6GCwc1g
}; f!;i$Oif
BQWEC,*N
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) !}wJ+R ^2
{ 0S@O]k)
//{{AFX_DATA_INIT(CAboutDlg) \KfngYD]W
//}}AFX_DATA_INIT \3dMA_5
} KZO!
~Nf01,F
void CAboutDlg::DoDataExchange(CDataExchange* pDX) dq%N,1.F
{ Q:Q)-|,
CDialog::DoDataExchange(pDX); C5QPt
//{{AFX_DATA_MAP(CAboutDlg) ay6G1\0W
//}}AFX_DATA_MAP CBx 1.xL
} H=]$9ZH!
r,=xI`XH
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) e#Jx|Ej=
//{{AFX_MSG_MAP(CAboutDlg) #.p^S0\pw
// No message handlers
a9z|ef
//}}AFX_MSG_MAP DQW^;Ls
END_MESSAGE_MAP() 6Uq@v8mh
VKy:e.
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) B`OggdE
: CDialog(CCaptureDlg::IDD, pParent) 9Ue3
%?~c
{ {snLiCl
//{{AFX_DATA_INIT(CCaptureDlg) q@;WXH O0
m_bControl = FALSE; a?6
r4u0
m_bAlt = FALSE; x.ZV<tDi7
m_bShift = FALSE; jEfrxlj
m_Path = _T("c:\\"); &n|!
'/H
m_Number = _T("0 picture captured."); PETrMu<
nCount=0; V ~w(^;o@
bRegistered=FALSE; pH.wCD:1n
bTray=FALSE; {:40Jf
//}}AFX_DATA_INIT qF=D,Dlz
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 [oOZ6\?HB
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); P(G$@},W
} r AMnM>`
jPYed@[+
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) zR
h1
{ fV*x2g7w
CDialog::DoDataExchange(pDX); Ous[{" -J
//{{AFX_DATA_MAP(CCaptureDlg) F.c`0u;=
DDX_Control(pDX, IDC_KEY, m_Key); bTZ/$7pp9
DDX_Check(pDX, IDC_CONTROL, m_bControl); M$#zvcp
DDX_Check(pDX, IDC_ALT, m_bAlt); i+T#z
DDX_Check(pDX, IDC_SHIFT, m_bShift); )hj77~{+
DDX_Text(pDX, IDC_PATH, m_Path); 2D`@$)KL
DDX_Text(pDX, IDC_NUMBER, m_Number); #*q`/O5n
//}}AFX_DATA_MAP P,!si#
} 6XUcJ0
$s.:wc^
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) _Hi;Y
//{{AFX_MSG_MAP(CCaptureDlg) 3 D,PbAd
ON_WM_SYSCOMMAND() J]i=SX+ 9
ON_WM_PAINT() cv;&ff2%?
ON_WM_QUERYDRAGICON() i`7{q~d=
ON_BN_CLICKED(ID_ABOUT, OnAbout) iaXNf
])?
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) P{5p'g ,
ON_BN_CLICKED(ID_CHANGE, OnChange) t,=
ta{
a
//}}AFX_MSG_MAP Z_F:H@-&
END_MESSAGE_MAP() T+NEw8C?/
wxpD{P
BOOL CCaptureDlg::OnInitDialog() 6~?7CK
{ a#FkoA~M
CDialog::OnInitDialog(); CyO2Z
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); p%,:U8fOR
ASSERT(IDM_ABOUTBOX < 0xF000); ElhTB
CMenu* pSysMenu = GetSystemMenu(FALSE); o%X_V!B{V
if (pSysMenu != NULL) `x$d8(1J`#
{ `48jL3|
CString strAboutMenu; X!&DKE
strAboutMenu.LoadString(IDS_ABOUTBOX); aq~hl7MTj
if (!strAboutMenu.IsEmpty()) l5Z=aW Q
{ -h^FSW($-R
pSysMenu->AppendMenu(MF_SEPARATOR);
Tn2Z{.q$
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); @gENv~m<OI
} q7mqzMDk
} & S_gNa
SetIcon(m_hIcon, TRUE); // Set big icon ,kuJWaUC@
SetIcon(m_hIcon, FALSE); // Set small icon \k0%7i[nZ/
m_Key.SetCurSel(0); PXm{GLXRS;
RegisterHotkey(); 2G:)27Q-
CMenu* pMenu=GetSystemMenu(FALSE); 7}-.U=tnP
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); v 2k/tT$t
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); dsX{5
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 7!w@u6Q
return TRUE; // return TRUE unless you set the focus to a control J}EQ_FC"$
} {,.1KtrSN
,)'!E^n
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ^M6v;8EU
{ [ik D4p=
if ((nID & 0xFFF0) == IDM_ABOUTBOX) ?l`DkUo*j
{ \c/jp5=}
CAboutDlg dlgAbout; N}nU\e6 Y
dlgAbout.DoModal(); !1+L0,I6
} xr?=gY3E;
else mm/U9hbp%
{ I?dh"*Js&
CDialog::OnSysCommand(nID, lParam); r Efk5R
} Ks@S5:9sp
} X<\^*{
vi@a87w>
void CCaptureDlg::OnPaint() Ttn=VX{
\
{ ^~-i>gTD
if (IsIconic()) bB3Mpaw@
{ /@R|*7K;9
CPaintDC dc(this); // device context for painting 'Kxs>/y3
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); -en:81a#
// Center icon in client rectangle WqqrfzlM
int cxIcon = GetSystemMetrics(SM_CXICON); OJ8W'"`L&
int cyIcon = GetSystemMetrics(SM_CYICON); NSHWs%Zc
CRect rect; NLw#b?%
GetClientRect(&rect); 'P32G?1C&p
int x = (rect.Width() - cxIcon + 1) / 2; g[*+R9'
int y = (rect.Height() - cyIcon + 1) / 2; #tN)OZA
// Draw the icon (S0MqX*
dc.DrawIcon(x, y, m_hIcon); 'Fo*h6=
} #<0%_Ca
else c.m '%4
{ +`kfcA#pi
CDialog::OnPaint(); {5-4^|!
} K8Gc5#OF
} |@]J*Kh
=+~e44!~D
HCURSOR CCaptureDlg::OnQueryDragIcon() bM_Y(TgJ
{ f%ZqK_CW
return (HCURSOR) m_hIcon; [0yKd?e
} hEsCOcEG
YZ:YYcr
void CCaptureDlg::OnCancel() C/"fS#<
{ w4:S>6X
if(bTray) ]p(+m_F
DeleteIcon(); epCU(d*b
CDialog::OnCancel(); x?KgEcnw2X
} {2R b^K
%*e6@Hm
void CCaptureDlg::OnAbout() ?,%vndI
{ )s,L:{<
CAboutDlg dlg; !~04^(
dlg.DoModal(); mC
n,I
} zHG
KPuk'
Wd_bDZQ
void CCaptureDlg::OnBrowse() OZ&J'Y
{ -LzHCO/7(
CString str; rK)So#'
BROWSEINFO bi; M A} =
char name[MAX_PATH]; PH9MB
ZeroMemory(&bi,sizeof(BROWSEINFO)); qC SJ=T;
bi.hwndOwner=GetSafeHwnd(); uaNJTob
bi.pszDisplayName=name; %'"#X?jk1
bi.lpszTitle="Select folder"; + Q
If7=
bi.ulFlags=BIF_RETURNONLYFSDIRS; zAC
LPITEMIDLIST idl=SHBrowseForFolder(&bi); 9'o!9_j
if(idl==NULL) cE/7B'cR
return; m'KY;C
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); y1,L0v$=}
str.ReleaseBuffer(); l]WVgu
m_Path=str; SOE#@{IXBa
if(str.GetAt(str.GetLength()-1)!='\\') dI5Z*"`R9
m_Path+="\\"; lu`\6
UpdateData(FALSE); mG7Wu{~=U
} Z6!MX_ep
UA!h[+Z
void CCaptureDlg::SaveBmp() }C/u>89%q
{ C#emmg!a\
CDC dc; /YR*KxIx
dc.CreateDC("DISPLAY",NULL,NULL,NULL); O4$ra;UM`
CBitmap bm; <wFR%Y/j
int Width=GetSystemMetrics(SM_CXSCREEN); &Sj<X`^
int Height=GetSystemMetrics(SM_CYSCREEN); =2s5>Oz+
bm.CreateCompatibleBitmap(&dc,Width,Height); R5ZnkPEA
CDC tdc; xAYC%)
tdc.CreateCompatibleDC(&dc); m}T^rX%m_
CBitmap*pOld=tdc.SelectObject(&bm); Pg-~^"?y
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 1HskY| X
tdc.SelectObject(pOld); w8wF;:>
BITMAP btm; ?1?^>M
bm.GetBitmap(&btm); PYkcGtVa_
DWORD size=btm.bmWidthBytes*btm.bmHeight; -i V&-oP
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); }el.qZ
BITMAPINFOHEADER bih; e7t).s)b{
bih.biBitCount=btm.bmBitsPixel; +[UFf3(ON
bih.biClrImportant=0; wA+J49
bih.biClrUsed=0; @4B+<,i
bih.biCompression=0; VW<s_
bih.biHeight=btm.bmHeight; H?sl_3-#
bih.biPlanes=1; 3uwu}aw
bih.biSize=sizeof(BITMAPINFOHEADER); Z_QSVH68A
bih.biSizeImage=size; 3q R@$pm
bih.biWidth=btm.bmWidth; MxuwEV|^
bih.biXPelsPerMeter=0; ik+qx~+`Qv
bih.biYPelsPerMeter=0; 7B _;YT
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); R@5jEf
static int filecount=0; T3[\;ib}
CString name; +h pXMO%?
name.Format("pict%04d.bmp",filecount++); j?i Ur2
name=m_Path+name; 8JAA?0L"'
BITMAPFILEHEADER bfh; $^.LZ1Jd
bfh.bfReserved1=bfh.bfReserved2=0; d;|e7$F'
bfh.bfType=((WORD)('M'<< 8)|'B'); 8X!UtHml
bfh.bfSize=54+size; [z]@<99/
bfh.bfOffBits=54; p/:)Z_
CFile bf; D'YF[l
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ i6-q%%]6
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); "FT5]h
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); W8,XSUl
bf.WriteHuge(lpData,size); hmtRs]7
bf.Close(); _U1~^ucV
nCount++; `)`_G!a
} D%LqLLD
GlobalFreePtr(lpData); 6dV@.(][a
if(nCount==1) xrA(#\}f$
m_Number.Format("%d picture captured.",nCount); .LEQ r)
else Bz_['7D
m_Number.Format("%d pictures captured.",nCount); 1.o-2:]E
UpdateData(FALSE); s{NEP/QQJ
} p)f OAr
>@[`,
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) U`,&Q]
{ [@"H2#CQ
if(pMsg -> message == WM_KEYDOWN) ?;0=>3p*0
{ g:q+.6va"
if(pMsg -> wParam == VK_ESCAPE) n>Y3hY
return TRUE; RsIEY5Q
if(pMsg -> wParam == VK_RETURN) 2xZg, \
return TRUE; t^&:45~Q
} Oo`P +S#
return CDialog::PreTranslateMessage(pMsg); d0>V^cB '?
} ~=Z&l
K8pfk*NZ_@
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) rwtSn?0z"
{ /&$'v:VB
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ U)zd~ug?m
SaveBmp(); Yi{[llru
return FALSE; $G"PZ7
} .bB_f7TH.
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ {DI_i +2
CMenu pop; f?dNTfQ3mi
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ":"QsS#*"#
CMenu*pMenu=pop.GetSubMenu(0); @?!/Pl49R
pMenu->SetDefaultItem(ID_EXITICON); 8d-; ;V
CPoint pt; 25l6@7q.
GetCursorPos(&pt); +>.plvZhu
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); fNFdZ[qOd
if(id==ID_EXITICON) T73oW/.0X?
DeleteIcon(); WnLgpt2G
else if(id==ID_EXIT) -fj;9('YJ
OnCancel(); z<+".sD'
return FALSE; oZ& ns!#
} J@oGAa%3)
LRESULT res= CDialog::WindowProc(message, wParam, lParam); //JF$o=)D
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) fg8V6FS
AddIcon(); 6^wg'u]c
return res; la8se=^
} Vvm6T@b M8
Q0gO1T
void CCaptureDlg::AddIcon() _R1UEE3M
{ H'<9;bD -
NOTIFYICONDATA data; "@gJ[BL#
data.cbSize=sizeof(NOTIFYICONDATA); dg4"4\c*P
CString tip; V(L~t=k$
tip.LoadString(IDS_ICONTIP); NSOWn]E
data.hIcon=GetIcon(0); zek\AQN
data.hWnd=GetSafeHwnd(); ,4NvD2Y
strcpy(data.szTip,tip); OZbwquF@
data.uCallbackMessage=IDM_SHELL; elWN-~
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 6[69|&
data.uID=98; 394u']M
Shell_NotifyIcon(NIM_ADD,&data); A~ '2ki5$g
ShowWindow(SW_HIDE); \C
ZiU3
bTray=TRUE; B+jT|Y'
} ynw^nmM
XU2HWa
void CCaptureDlg::DeleteIcon() nOkX:5
{ zr&K0a{hc
NOTIFYICONDATA data; ]b'K
BAMy
data.cbSize=sizeof(NOTIFYICONDATA); iEr|?,
data.hWnd=GetSafeHwnd(); 7_S+/2}U*
data.uID=98; $P^=QN5Bb
Shell_NotifyIcon(NIM_DELETE,&data); <.l5>mgkCw
ShowWindow(SW_SHOW); Y3-Tg~/~W
SetForegroundWindow(); eoR@5OA&
ShowWindow(SW_SHOWNORMAL); C]WVH\Pp
bTray=FALSE; ,'Y*e[
} N,(@k[uta
vn
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void CCaptureDlg::OnChange() !H~!i.m'-
{ u7^Z7;
J
RegisterHotkey(); (8GJLs 8
} D?}LKs[
;p BXAl
BOOL CCaptureDlg::RegisterHotkey() XC?H
{ h"l{cDk
UpdateData(); J%aW^+O
UCHAR mask=0; '&?47+W
UCHAR key=0; E-X-LR{CC
if(m_bControl) \Wt&z,
mask|=4; ZB`!@/3X
if(m_bAlt) Kw(/#C:$
mask|=2; S? r:=GS
if(m_bShift) plsf` a
mask|=1; l2gI2Cioa
key=Key_Table[m_Key.GetCurSel()]; L^RyJ;^c
if(bRegistered){ `*KS`
z?
DeleteHotkey(GetSafeHwnd(),cKey,cMask); iFF/[P
bRegistered=FALSE; 5irewh'R
} ) OZDq]mV
cMask=mask; p J+>qy5
cKey=key; ^P"t
"
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); a+A/l
return bRegistered; BR*""/3`
} eP&K]#
; y=w :r\A
四、小结 y|.wL=;
.NCQiQ
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。