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:
iJBZnU:Mp
FcA0 \`0M 一、实现方法
l;uEw /L.a:Er$ 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:
Ou^dI 1yu!:8=ee #pragma data_seg("shareddata")
~CA+'e%~~ HHOOK hHook =NULL; //钩子句柄
;
F=_ozWV* UINT nHookCount =0; //挂接的程序数目
$gNCS:VG* static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
XHr{\/4V static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
M<"D!h9YP static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
N5\<w> static int KeyCount =0;
LjH];=R static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
_MU'he^W #pragma data_seg()
[H6>] & RC 48e._t 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
c nzPq\ JI&>w-~D DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
R|suBF3 i]nE86.;
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
luMNi^FQ cKey,UCHAR cMask)
II91Ia {
jnTl%aQYc BOOL bAdded=FALSE;
H2]I__t/u for(int index=0;index<MAX_KEY;index++){
1}6pq2 if(hCallWnd[index]==0){
0\+Qi?& hCallWnd[index]=hWnd;
K +~ HotKey[index]=cKey;
`Ao:} HotKeyMask[index]=cMask;
"#7i-?= bAdded=TRUE;
o$-Phl KeyCount++;
.#n?^73 break;
(\}IOCNS }
/Yh8r1^2tZ }
Q-"FmD-Yw return bAdded;
7v-C-u[E` }
EP[
gq //删除热键
rnr7t \a~] BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
v%1# y5 {
rLwc=(| BOOL bRemoved=FALSE;
$H#&.IjY for(int index=0;index<MAX_KEY;index++){
/$n${M5! if(hCallWnd[index]==hWnd){
3EyN"Lvp{o if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
<ygO?m{ hCallWnd[index]=NULL;
7@sWT<P HotKey[index]=0;
|"mb59X HotKeyMask[index]=0;
3!,%;Vz= bRemoved=TRUE;
vmoqsdZ/ KeyCount--;
zme:U![ break;
z+4R[+[ }
,y0kzwPR1 }
68y.yX[ }
ESs)|t h return bRemoved;
/90@ 85%r }
(~P&$$qfD @ +7'0[y? F kWJB> DLL中的钩子函数如下:
&EQov9P7 K|B1jdzL LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
a%AU9?/q# {
-B_dE-l, BOOL bProcessed=FALSE;
$exu}% if(HC_ACTION==nCode)
&L/C:<. {
&~k/G if((lParam&0xc0000000)==0xc0000000){// 有键松开
H1l'\ switch(wParam)
#*9*[Xbi {
X)yTx8v4 case VK_MENU:
9Dpmp| MaskBits&=~ALTBIT;
toQn]MT break;
ss[8d%V case VK_CONTROL:
tHGK<rb MaskBits&=~CTRLBIT;
8^^al!0K~ break;
mU3UQ
j case VK_SHIFT:
^|8cS0dK]Q MaskBits&=~SHIFTBIT;
B^6P6, break;
rOcfPLJi0 default: //judge the key and send message
GxvVh71zP break;
We" "/X }
.z_^_@qdm for(int index=0;index<MAX_KEY;index++){
PKwx)!
Rz if(hCallWnd[index]==NULL)
r2Q"NVw continue;
F`-? 3]\3 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
C6Kz6_DQZ {
0]" j, SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
9)=as/o bProcessed=TRUE;
Edjh* }
^lQej% }
u^{Q|o:=x }
0[PP-]JS else if((lParam&0xc000ffff)==1){ //有键按下
bT8BJY%+ switch(wParam)
=B;)h {
I&^?,Fyy< case VK_MENU:
"['YMhu_ MaskBits|=ALTBIT;
HVC\(h,)i break;
tmm\V7sJ case VK_CONTROL:
:?60pu= MaskBits|=CTRLBIT;
ok7DI break;
x[)S3UJ case VK_SHIFT:
Uqkh@-6- MaskBits|=SHIFTBIT;
%D&FnTa break;
E P<U:F default: //judge the key and send message
1pc|]9B break;
(Q\w4?ci }
ag] nVE/ for(int index=0;index<MAX_KEY;index++){
#M_QSD}& if(hCallWnd[index]==NULL)
hwexv 9"" continue;
.fZv H if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
(=p}b:Z {
3Hq0\Y"Y SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
\0b",|"3 bProcessed=TRUE;
$i =-A }
^P]: etld9 }
h>\}-|Ek }
@w2}WX> if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
(2%C%#]8 for(int index=0;index<MAX_KEY;index++){
6_9w1
,WE if(hCallWnd[index]==NULL)
>;HXH^q continue;
E6n;_{Se/S if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
8y+Gvk: SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
xNjA>S\]W5 //lParam的意义可看MSDN中WM_KEYDOWN部分
+[*UC" }
8o~\L=
l }
8_KXli}7= }
jP+4'O!s[ return CallNextHookEx( hHook, nCode, wParam, lParam );
]bRu8kn }
ytJ |jgp' ^\x
PF5 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:
mV^dIm Th"7p:SE? BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
pKp#4Js BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
|rNm_L2 Ef7Kx49I 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:
`UeF3~)>E m
81\cg LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
76c}Rk^ {
\2~.r/`1 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
fV[xv4D. {
/ZD/!YD&R //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
1f~_# EIC SaveBmp();
C?b Mj[$ return FALSE;
dU+1@_ }
L9G=+T9 …… //其它处理及默认处理
;M}bQ88 }
i3f/{D/ `L:wx5? {!x-kF_ 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。
po{f*}gas] :@Q_oyWE8 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。
d'DS7F(c{ tMupX-V 二、编程步骤
?5Lom#^ 8whjPn0 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";
F2+lwyc Y ab
2V.S 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
Z^#7&Pv0 ujDAs%6MZ 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;
Hjlx,:'M LG51e7_gFi 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;
%f?#) 01> {K:/(\ 5、 添加代码,编译运行程序。
7rsrC I /RvU, 三、程序代码
G.c s-f f61~%@fE ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
W*VQ"CW{^] #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
Vd|/]Zj #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
1eKJ46W #if _MSC_VER > 1000
sd>#Hn #pragma once
$^`hu%s,~ #endif // _MSC_VER > 1000
I7]45pF #ifndef __AFXWIN_H__
+}z
T][9w #error include 'stdafx.h' before including this file for PCH
? p\'S
w: #endif
Ip?Ueaei #include "resource.h" // main symbols
d6~wJ MFl class CHookApp : public CWinApp
w=O:|Xu#* {
2R.YHj public:
{dCk iF CHookApp();
{"s9A& // Overrides
#]n[ // ClassWizard generated virtual function overrides
V$^x]z //{{AFX_VIRTUAL(CHookApp)
'gQm%:qU3r public:
zoO>N'b3) virtual BOOL InitInstance();
*:)#'cenI virtual int ExitInstance();
=OhhMAn //}}AFX_VIRTUAL
0]NjsOU= //{{AFX_MSG(CHookApp)
awMm&8cIM // NOTE - the ClassWizard will add and remove member functions here.
NOo&5@z;H // DO NOT EDIT what you see in these blocks of generated code !
.LV=Z0ja //}}AFX_MSG
\:^$ZBQr<n DECLARE_MESSAGE_MAP()
W._vikR };
rt t?4 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
>>K)
4HYID BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
Fx)]AJ~[t BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
awo=%vJ& BOOL InitHotkey();
l{Xsh;%= BOOL UnInit();
&ViIxJZ1$ #endif
;LthdY()n( aU 5t|S6 //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
Mm|HA@W^ #include "stdafx.h"
vy6NH5Q #include "hook.h"
'$l*FWOEal #include <windowsx.h>
V<nh+Q3<d #ifdef _DEBUG
O:pQf/Xn #define new DEBUG_NEW
3p$ZHH.UP #undef THIS_FILE
o%Pi;8 static char THIS_FILE[] = __FILE__;
.r[J} O" #endif
6'|J
; #define MAX_KEY 100
R+rHa#M_ #define CTRLBIT 0x04
$F;$-2 #define ALTBIT 0x02
I3s'44 #define SHIFTBIT 0x01
*s;$`8fM< #pragma data_seg("shareddata")
goWD~'\ HHOOK hHook =NULL;
xLq+njH E UINT nHookCount =0;
HwM:bY
N static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
-&@[]/ static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
5N`g static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
/>.& static int KeyCount =0;
|oPqX %? static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
t[)z/[m #pragma data_seg()
kZSe#'R's HINSTANCE hins;
a5]~%xdK void VerifyWindow();
# |w,^tV BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
rS)7D //{{AFX_MSG_MAP(CHookApp)
$?ke " // NOTE - the ClassWizard will add and remove mapping macros here.
r 3pfG // DO NOT EDIT what you see in these blocks of generated code!
Kxh)'aal //}}AFX_MSG_MAP
tJ2l_M^ END_MESSAGE_MAP()
_mA[^G=gY o NJ/AT CHookApp::CHookApp()
P^VV8Z>\& {
e>sr)M // TODO: add construction code here,
!OC?3W:^_ // Place all significant initialization in InitInstance
T-f+<Cxf }
6Q>:g"_ bZERh:%o CHookApp theApp;
_S@s LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
i&Xr+Zsec" {
JFR,QUT BOOL bProcessed=FALSE;
|VaXOdD`& if(HC_ACTION==nCode)
++Az~{W7 {
^Q2K0'm5 if((lParam&0xc0000000)==0xc0000000){// Key up
-DU[dU*~ switch(wParam)
Rz*%(2Vz {
bWjW_$8 case VK_MENU:
Tw-gM-m; MaskBits&=~ALTBIT;
{@B<$g break;
]7c715@ case VK_CONTROL:
'1/uf;OXIH MaskBits&=~CTRLBIT;
4^ $ break;
MU%C_d%. case VK_SHIFT:
N1+%[Uh9) MaskBits&=~SHIFTBIT;
[bH6>{3u break;
"4oY F:h default: //judge the key and send message
W@JmG`Sy break;
|!aMj8i2 }
RxjC sjg for(int index=0;index<MAX_KEY;index++){
R'u M7,7 if(hCallWnd[index]==NULL)
.FtW$Y~y continue;
B9&"/tT if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
fnN"a Z {
[HNWM/ff7+ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
vU=+ bProcessed=TRUE;
I2"F2(>8K }
5M6`\LyU }
B.
'&[A }
tgeX~. else if((lParam&0xc000ffff)==1){ //Key down
pPD}>q switch(wParam)
C{<dzooz {
ey/=\@[p case VK_MENU:
3dB{DuQ MaskBits|=ALTBIT;
TFYp=xK( break;
~^v*f case VK_CONTROL:
:BVYS|% MaskBits|=CTRLBIT;
n|Gw?@CU7 break;
VIg=|Oe), case VK_SHIFT:
SCKpW#2dP{ MaskBits|=SHIFTBIT;
m`H9^w%W break;
3T3p[q4 default: //judge the key and send message
<E|K<}W# break;
2\z"6 }
wxg`[c$: for(int index=0;index<MAX_KEY;index++)
$PstThM {
`pm6Ts{, if(hCallWnd[index]==NULL)
0NZg[ >H continue;
>I8R[@ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
,#UaWq@7 {
ed2QGTgR SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
Cz
Jze bProcessed=TRUE;
}Hrm/Ni }
E*.D_F }
6N :fq }
]U! ?{~ if(!bProcessed){
Cz+>S3v M for(int index=0;index<MAX_KEY;index++){
2ME3= C if(hCallWnd[index]==NULL)
^4O1:_|G continue;
R.!'&<Svq if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
9Rzu0:r., SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
`3SY~&X }
B~V^?." }
{b"V7vn, }
7*M+bZ`x return CallNextHookEx( hHook, nCode, wParam, lParam );
60*2k }
|(*ReQ?= +S5"4< BOOL InitHotkey()
ZTVX5"#Q {
+tkDT@ ` if(hHook!=NULL){
fl!8 \4 nHookCount++;
vp1IYW return TRUE;
D?)91P/R }
*@S:f"i else
PP.QfY4 hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
QnME|j\ if(hHook!=NULL)
/w^}(IJ4 nHookCount++;
200/ return (hHook!=NULL);
&{]zL }
!=3[Bm G BOOL UnInit()
\ty{KAc& {
1\=)b< y if(nHookCount>1){
eqb8W5h' nHookCount--;
|`1lCyV\tE return TRUE;
R7r` (c! }
B+#!%J_ BOOL unhooked = UnhookWindowsHookEx(hHook);
B<u6Z!Pp2 if(unhooked==TRUE){
zp:kdN7!^ nHookCount=0;
5f(yF hHook=NULL;
+)h *) }
>k"Z'9l return unhooked;
?'Y\5n/*$ }
5 >S#ew qT$;ZV
# BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
26.),a {
~1]4 J(+ BOOL bAdded=FALSE;
c>#T\AEkF for(int index=0;index<MAX_KEY;index++){
!K-lO{Z^ if(hCallWnd[index]==0){
gHpA@jdC* hCallWnd[index]=hWnd;
HT0VdvLw HotKey[index]=cKey;
5ltEnvN HotKeyMask[index]=cMask;
zP$0B!9 bAdded=TRUE;
cVYDO*N2T KeyCount++;
Mrysy)x break;
I(tMw6C$: }
-c|dTZ8D)8 }
iZ}Afj return bAdded;
W=:4I[a6Q }
: 8dQ8p; Q#w mS&$f BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
wCw-EGLR {
v EppkS U1 BOOL bRemoved=FALSE;
{9:[nqX for(int index=0;index<MAX_KEY;index++){
Hvqvggfi if(hCallWnd[index]==hWnd){
o81RD#>E) if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
nwuH:6~" hCallWnd[index]=NULL;
Z>hS&B HotKey[index]=0;
B_R
J;.oH HotKeyMask[index]=0;
@`R#t3)8JP bRemoved=TRUE;
omz%:'m`~ KeyCount--;
;e
Iqxe> break;
cjK\(b3 }
k{\wjaf) }
H4RqOI }
1<|\df. return bRemoved;
1g_p`( }
^u2unZ9BK! @jh\yj rW void VerifyWindow()
1i=lJmr {
%!DdjC&5* for(int i=0;i<MAX_KEY;i++){
V /i~IG`h/ if(hCallWnd
!=NULL){ >A&D/kMO
if(!IsWindow(hCallWnd)){ =u\W{1
hCallWnd=NULL; HGycF|]2
HotKey=0; mq#8[D
HotKeyMask=0;
55O_b)$
KeyCount--; #h=pU/R
} kXW5bR
} v7-z<'?s~
} hk*@<ff
} ]bcAbCZ@
+az=EF
BOOL CHookApp::InitInstance() xWRkg$A
{ D[jPz0
AFX_MANAGE_STATE(AfxGetStaticModuleState()); :O?+Ywn
hins=AfxGetInstanceHandle(); g\.O5H9Od
InitHotkey(); r4MPs-}oF
return CWinApp::InitInstance(); @kstG3@
} K92nh/}y
M{GT$Q
int CHookApp::ExitInstance() FTgqE@
{ C>NLZMT
VerifyWindow(); hqDnmzG
UnInit(); 2xxw8_~C
return CWinApp::ExitInstance(); "udA-;!@&
}
M4H~]Ftn
Jb;@'o6
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file %+pF4f8]
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) bU4l|i;j
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ }1kZF{KD<[
#if _MSC_VER > 1000 aM5Hp>'nI
#pragma once jjT)3
c:J[
#endif // _MSC_VER > 1000 *lo0T93B
PenkqDc}
class CCaptureDlg : public CDialog j{$2.W$
{ GI5#{-)
// Construction 9P1!<6mN\
public: `RlMfd
BOOL bTray; Zjkg"
BOOL bRegistered; 2F&VG|"
BOOL RegisterHotkey(); d~abWBgC`
UCHAR cKey; JZup} {a
UCHAR cMask; cj;k{Moc
void DeleteIcon(); ^ *1hz<
void AddIcon(); bHRRgR`,
UINT nCount; k0bDEz.X
void SaveBmp(); mS?W+jy%
CCaptureDlg(CWnd* pParent = NULL); // standard constructor Ghf/IXq#
// Dialog Data 9dCf@5]
//{{AFX_DATA(CCaptureDlg) wiP )"g.t
enum { IDD = IDD_CAPTURE_DIALOG }; ruU &.mZ
CComboBox m_Key; e3.q8r
BOOL m_bControl; "1wjh=@z
BOOL m_bAlt; ':d9FzGKa
BOOL m_bShift; YH,u*.I^/
CString m_Path; qFE(H1hy
CString m_Number; /?%1;s:'
//}}AFX_DATA *@eZt*_
// ClassWizard generated virtual function overrides Ake$M^Bz
//{{AFX_VIRTUAL(CCaptureDlg) \R[f< K%
public: @bIZ0tr4
virtual BOOL PreTranslateMessage(MSG* pMsg); :h8-y&;
protected: @[v4[yq-
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ne|N!!Dmk
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); KY+BXGW*
//}}AFX_VIRTUAL 9j>LU<Z
// Implementation [_-[S
protected: AOM@~qyc
HICON m_hIcon; T9?8@p\}(
// Generated message map functions UO(?EELm
//{{AFX_MSG(CCaptureDlg) q0*d*j F0u
virtual BOOL OnInitDialog(); wCt!.<, .
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ,zOv-pH
afx_msg void OnPaint(); YP`/dX"4
afx_msg HCURSOR OnQueryDragIcon(); #k
t+
)>
virtual void OnCancel(); =`g@6S
afx_msg void OnAbout(); 7|DPevrk
afx_msg void OnBrowse(); v[]&yD
afx_msg void OnChange(); !i8'gq'q
//}}AFX_MSG ,56objaE
DECLARE_MESSAGE_MAP() 3vj1FbY
}; LAH.PcjPa
#endif '_l5Br73=
lnnT_[ni.
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file E`#/m@:|-
#include "stdafx.h" O4oI&i 7
#include "Capture.h" ,HwOMoP7
#include "CaptureDlg.h" Gj&`+!\
#include <windowsx.h> W3A9uk6
#pragma comment(lib,"hook.lib") 5@^['S4%8*
#ifdef _DEBUG JgMYy,q8t
#define new DEBUG_NEW lNx:_g:SrZ
#undef THIS_FILE 6Ao{Aej|
static char THIS_FILE[] = __FILE__; -"5r-q q*
#endif ~m&q@ms&
#define IDM_SHELL WM_USER+1 z4r g.ai
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); k3UKGP1
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Gg3<
}(
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; QFU1l"(qGk
class CAboutDlg : public CDialog eT@,QA(3
{ "]hQ\b\O
public: ok/{ w
CAboutDlg(); bj_oA
i
// Dialog Data O"emse}Z
//{{AFX_DATA(CAboutDlg)
K2D,
*w
enum { IDD = IDD_ABOUTBOX }; Rz"gPU4;`
//}}AFX_DATA _$m1?DZ
// ClassWizard generated virtual function overrides dPmNX-'7
//{{AFX_VIRTUAL(CAboutDlg) kmM->v
protected: dCO)"]
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support dReJ;x4
//}}AFX_VIRTUAL i|CAN,'
// Implementation iJ p E`
protected: Pvz\zRq
//{{AFX_MSG(CAboutDlg) GI)eq:K_U8
//}}AFX_MSG gJ?Vk<hp
DECLARE_MESSAGE_MAP() nE=,=K~
}; c3C<P
=4804N7
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 0l2@3}e
{ 8}{W.np_
//{{AFX_DATA_INIT(CAboutDlg) %Mr^~7nN
//}}AFX_DATA_INIT M1J77LfS8
} M6H#Y2!ZbC
W5R /
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Itv}TK
eF
{ fl o9iifZ
CDialog::DoDataExchange(pDX); Kd;)E 9Ti
//{{AFX_DATA_MAP(CAboutDlg) q1,jDJglZ
//}}AFX_DATA_MAP dr]Pns9
} o>o! -uf
tl^![Z
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) M7\yEi"*
//{{AFX_MSG_MAP(CAboutDlg) Q$8K-5U%
// No message handlers OpFm:j3
//}}AFX_MSG_MAP PEPf=sm
END_MESSAGE_MAP() G }U'?p
o>Q=V0?
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) :bu]gj4e
: CDialog(CCaptureDlg::IDD, pParent) S94S[j0D
{ UzT"Rb:e
//{{AFX_DATA_INIT(CCaptureDlg) 67A g.f6-
m_bControl = FALSE; maVfLVx-
m_bAlt = FALSE; Jo4iWJpK
m_bShift = FALSE; `w EAU7m:
m_Path = _T("c:\\"); ")D5ulb\
m_Number = _T("0 picture captured."); tWaM+W
nCount=0; V~fPp"F
bRegistered=FALSE; !30BR|K*
bTray=FALSE; Zce/&
//}}AFX_DATA_INIT `]j:''K
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 [(m+Ejzi%
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); VRD:PVz
} J4#rOS
>$G'=N:=X&
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) M6XpauR-
{ d'k99(vy
CDialog::DoDataExchange(pDX); D2]i*gs
//{{AFX_DATA_MAP(CCaptureDlg) DE!c+s_g4
DDX_Control(pDX, IDC_KEY, m_Key); !z2 KQ
4C
DDX_Check(pDX, IDC_CONTROL, m_bControl); q}cm"lO$
DDX_Check(pDX, IDC_ALT, m_bAlt); GGez!?E%
DDX_Check(pDX, IDC_SHIFT, m_bShift); K(}g!iT)~
DDX_Text(pDX, IDC_PATH, m_Path); +{L=cWA"
DDX_Text(pDX, IDC_NUMBER, m_Number); L)X[$:
//}}AFX_DATA_MAP !yD$fY
} D+"+m%^>C
GBYwS{4
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) )Y:C'*.r
//{{AFX_MSG_MAP(CCaptureDlg) og`K!d~
ON_WM_SYSCOMMAND() r mJ`^6V
ON_WM_PAINT() Z7dyPR
ON_WM_QUERYDRAGICON() HcCT=x7:
ON_BN_CLICKED(ID_ABOUT, OnAbout) y&6 pc
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Cq[<CPAS
ON_BN_CLICKED(ID_CHANGE, OnChange) k\Z7Dg$\D
//}}AFX_MSG_MAP w@x||K= Z
END_MESSAGE_MAP() ^NXxMC(e+
'+v[z=.8]
BOOL CCaptureDlg::OnInitDialog() "P a y2
{ X.eocy
CDialog::OnInitDialog(); K#LDmC
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); J~|:Q.Rt`
ASSERT(IDM_ABOUTBOX < 0xF000); -lS(W^r4
CMenu* pSysMenu = GetSystemMenu(FALSE); %r]V:d+
if (pSysMenu != NULL) ?H!QV;ku
{ @:t2mz:^i
CString strAboutMenu; t&Jrchk
strAboutMenu.LoadString(IDS_ABOUTBOX); LC})aV|
if (!strAboutMenu.IsEmpty()) 6cXZ3;a
{ DLPg0>;jl
pSysMenu->AppendMenu(MF_SEPARATOR); B7(bNr
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); h^'+y1
} J+m1d\lBu
} tHV+#3h
SetIcon(m_hIcon, TRUE); // Set big icon `\yQn7 Oq
SetIcon(m_hIcon, FALSE); // Set small icon I ;F\'P)e
m_Key.SetCurSel(0); E| y
RegisterHotkey(); M\9+?
CMenu* pMenu=GetSystemMenu(FALSE); xwojjiV
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ` >[Offhd
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); cnB:bQQK8
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); -nqq;|%
return TRUE; // return TRUE unless you set the focus to a control g`dAj4B
} {_ {zs!r
2 }rYH;Mx
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 5%"sv+iO
{ cH6J:0>W
if ((nID & 0xFFF0) == IDM_ABOUTBOX) ")9jt^
{ >[S\NAE>
CAboutDlg dlgAbout; X'p%K/-m
dlgAbout.DoModal(); [I,s: mn
} as"@E>a
else C0W-}H
{
CP
Ju=
CDialog::OnSysCommand(nID, lParam); dst!VO:
M
} a}[rk*QmZ
} '^(qlCI
(3&P8ZGNR
void CCaptureDlg::OnPaint() Esf\Bo"
{ ?N&s.
if (IsIconic()) DJ`xCs!R
{ zGa
V^X
CPaintDC dc(this); // device context for painting ])?[9c
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); V!QC.D<
// Center icon in client rectangle cC9haxW
int cxIcon = GetSystemMetrics(SM_CXICON); @4$la'XSx
int cyIcon = GetSystemMetrics(SM_CYICON); G,6 i!M
CRect rect; $Y8iT<nP
GetClientRect(&rect); p5J!j I=
int x = (rect.Width() - cxIcon + 1) / 2; UL"
M?).5
int y = (rect.Height() - cyIcon + 1) / 2; p
MR4]G
// Draw the icon zA|)9Dq
dc.DrawIcon(x, y, m_hIcon); IGo+O*dMw
} ,,G'Zur7
else oE)xL%*
{ "p[3^<~uQ
CDialog::OnPaint(); `Dp4Z>|
K
} W&7(
} WQMoAPfqL
nGxG!
HCURSOR CCaptureDlg::OnQueryDragIcon() S2EV[K8#
{ x[mh^V5ld
return (HCURSOR) m_hIcon; >]kZ2gVt
} w@H@[x
xW58B
void CCaptureDlg::OnCancel() M6y|;lh''c
{ h$p}/A
if(bTray) # ELYPp]6
DeleteIcon(); Qe`Nb4xf
CDialog::OnCancel(); 37*2/N2
} *vT Abk$
j|@8VxZ
void CCaptureDlg::OnAbout() {Rn*)D9
{ %DKC/%
CAboutDlg dlg; bjq.nn<=
dlg.DoModal(); g\ H~Y@'{
} =)J)xH!N
;8w
CQ
void CCaptureDlg::OnBrowse() ?O0,)hro
{ lU.aDmy<
CString str; \mqrDaB
BROWSEINFO bi; K6 ,d{n
char name[MAX_PATH]; 79B+8= K
ZeroMemory(&bi,sizeof(BROWSEINFO)); O~Svk'.)
bi.hwndOwner=GetSafeHwnd(); a!.Y@o5Ku
bi.pszDisplayName=name; }S{VR(i`J
bi.lpszTitle="Select folder"; _p<wATv?7t
bi.ulFlags=BIF_RETURNONLYFSDIRS; rd,!-w5
LPITEMIDLIST idl=SHBrowseForFolder(&bi); 0>
QqsQ
if(idl==NULL) CHDt^(oa!B
return; 4wx{i6
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); oo1h"[
str.ReleaseBuffer(); {ITxHt
m_Path=str; f DPLB[
if(str.GetAt(str.GetLength()-1)!='\\') e@PY(#ru
m_Path+="\\"; Ym2Ac>I4
UpdateData(FALSE); [B j\h7G
} mqDI'~T9 u
Ob]J!.
void CCaptureDlg::SaveBmp() +ijxv
{ 9 $^b^It
CDC dc; `2y?(BJp
dc.CreateDC("DISPLAY",NULL,NULL,NULL); 8J~-|<Q6
CBitmap bm; gI/(hp3ob
int Width=GetSystemMetrics(SM_CXSCREEN); =+H,}
int Height=GetSystemMetrics(SM_CYSCREEN); "O_)~u
bm.CreateCompatibleBitmap(&dc,Width,Height); 3teP6|K'g
CDC tdc; k|$?b7)"@
tdc.CreateCompatibleDC(&dc); m@YK8c#$
CBitmap*pOld=tdc.SelectObject(&bm); {gzVbZ#
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); BY@l:y4
tdc.SelectObject(pOld); {D8yqO A}
BITMAP btm; Dn`
bm.GetBitmap(&btm); k h6n(B\
DWORD size=btm.bmWidthBytes*btm.bmHeight; 2rHQ7
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); k&npC8oA
BITMAPINFOHEADER bih; xRZ/[1f!
bih.biBitCount=btm.bmBitsPixel; (4/W)L$
bih.biClrImportant=0; m8INgzVTC
bih.biClrUsed=0; <SdOb#2
bih.biCompression=0; =w<iYO
bih.biHeight=btm.bmHeight; D;OPsNQ
bih.biPlanes=1; }H/94]~tH
bih.biSize=sizeof(BITMAPINFOHEADER); 9fCU+s
bih.biSizeImage=size; dP"cm0
bih.biWidth=btm.bmWidth; hl2|Ec
bih.biXPelsPerMeter=0; 5!jt^i]O
bih.biYPelsPerMeter=0; nYO$ |/e
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); e~nh95
static int filecount=0; Z=l2Po n
CString name; 5f75r
name.Format("pict%04d.bmp",filecount++); !e~d,NIy
name=m_Path+name; M>i *e
BITMAPFILEHEADER bfh; T0 cm+|S
bfh.bfReserved1=bfh.bfReserved2=0; \aN5:Yy
bfh.bfType=((WORD)('M'<< 8)|'B'); DLO#_t^v.
bfh.bfSize=54+size; COd~H
bfh.bfOffBits=54; m"o=R\C
CFile bf; H~:g=Zw
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 7w\!3pv
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); |7.X)h`
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); !Wy&+H*0
bf.WriteHuge(lpData,size);
-:wV3D
bf.Close(); Ko
"JH=<
nCount++; &m{~4]qWpM
} ,S?:lQuK5
GlobalFreePtr(lpData); hJX;/~L
if(nCount==1) lxBcO/
m_Number.Format("%d picture captured.",nCount);
@;[. #hK
else }(WUZ^L
m_Number.Format("%d pictures captured.",nCount); <4^y7]]F
UpdateData(FALSE); 9~ifST\
} ]agdVr^
"T} HH
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) j92+kq>Xd
{ clr]gib
if(pMsg -> message == WM_KEYDOWN) vmW`}FKW
{ s3~6[T?8
if(pMsg -> wParam == VK_ESCAPE) Nt[&rO3s
return TRUE; =g=Vv"B_
if(pMsg -> wParam == VK_RETURN) /FcwsD\=$
return TRUE; wh^I|D?"
} U*T :p>&
return CDialog::PreTranslateMessage(pMsg); vY,]f^F"
} ]`}EOS-Q
w aDJ
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ;bq
EfV0`2
{ ~$bQ;`,L
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ [U{RDX
SaveBmp(); =[Tf9uQY
return FALSE; eh3CVgH91;
} dw7h@9\y
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 9(BB>o54r
CMenu pop; EtcXzq>w
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); d UiS0Qs}
CMenu*pMenu=pop.GetSubMenu(0); u?8e>a
pMenu->SetDefaultItem(ID_EXITICON);
TJb&f<
CPoint pt; K]i2$M
GetCursorPos(&pt); 3[To"You
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); J-Fqw-<aFJ
if(id==ID_EXITICON) iLFhm4.PO
DeleteIcon(); McU]U9:z
else if(id==ID_EXIT) et}s yPH
OnCancel(); j<i:rk|
return FALSE; f&Meiu+
} iS28p
LRESULT res= CDialog::WindowProc(message, wParam, lParam); jyjK~!0
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) k12mxR/
AddIcon(); ;p)fW/<
return res; 6z+*H7Qz
} "gi 1{
N~M-|^L
void CCaptureDlg::AddIcon() <1E*wPm8
{ {7o|*M
NOTIFYICONDATA data; a~[]Ye@H
data.cbSize=sizeof(NOTIFYICONDATA); )TgjaR9G
CString tip; D,'@b+B[
tip.LoadString(IDS_ICONTIP); aAkO>X%[
data.hIcon=GetIcon(0); -"3<Ll
data.hWnd=GetSafeHwnd(); )Y,>cg:z~
strcpy(data.szTip,tip); {2%@I~US
data.uCallbackMessage=IDM_SHELL; NU|T`gP
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; .;9I:YB$
data.uID=98; 81U(*6
Shell_NotifyIcon(NIM_ADD,&data); <lVW;l7
ShowWindow(SW_HIDE); _p=O*$b.
bTray=TRUE; s&zg!~@5b
} LP:C9Ol\
}c*6|B@f
void CCaptureDlg::DeleteIcon() zi}dQsy6
{ KA$l.6&d
NOTIFYICONDATA data; B^uQv|m
data.cbSize=sizeof(NOTIFYICONDATA); *a4nd_!
data.hWnd=GetSafeHwnd(); ~*h` ?A0
data.uID=98; O
WVa&8O
Shell_NotifyIcon(NIM_DELETE,&data); G@igxnm}
ShowWindow(SW_SHOW); bI~(<-S~K
SetForegroundWindow(); j:{d'OV
ShowWindow(SW_SHOWNORMAL); W.AN0N
bTray=FALSE; `$D2w|
} hE>i~:~R
}$|uIS
void CCaptureDlg::OnChange() q@x{6zj
{ n.$wW
=
RegisterHotkey(); @l:\Ka~TS
} =<,AzuV
sX,oJIt
BOOL CCaptureDlg::RegisterHotkey() 64OgE!
{ M[R\URu8
UpdateData(); DNdwMSwp
UCHAR mask=0; >De\2gbJ
UCHAR key=0; h[%`'(
if(m_bControl) '+NmHu:q
mask|=4; VY$hg
if(m_bAlt) lDNB0Ad
mask|=2; |C@)#.nm[
if(m_bShift) Z.$ncP0s
mask|=1; =*qu:f\y
key=Key_Table[m_Key.GetCurSel()]; JY#IeNL
if(bRegistered){ 2"C'Au
DeleteHotkey(GetSafeHwnd(),cKey,cMask); AZxx%6
bRegistered=FALSE; |HJdpY>Uu
} n8Jx;j
cMask=mask; j|9;")
1
cKey=key; :k075Zr/#D
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Ck2O?Ne
return bRegistered; D,d mlv
} (1%u`#5n-N
cUaLv1:HI
四、小结 DIH.c7o
Vp\BNq_!s
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。