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:
6':Egh[;
LnsYtkbr 一、实现方法
N.ZuSkRM 2"%f:?xV{ 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:
/<%L& SZ7; }
r8 #pragma data_seg("shareddata")
K@
&;f(Y HHOOK hHook =NULL; //钩子句柄
ASr@5uFR UINT nHookCount =0; //挂接的程序数目
AN|f:259 static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
cRNVqMpg static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
o)DO[ static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
V7O7"Q^q static int KeyCount =0;
/^bU8E&^M static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
n[# **s #pragma data_seg()
g-NrxyTBlx -w5sXnS 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。
Iek]/= /WLZyT2 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:
\=&Z_6Mu J+N
-+,, BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
B?y[ %i cKey,UCHAR cMask)
'T3xZ?*q= {
%=\*OIhl BOOL bAdded=FALSE;
jpTk@ for(int index=0;index<MAX_KEY;index++){
z^WY5~? if(hCallWnd[index]==0){
>&F:/ hCallWnd[index]=hWnd;
jpoNTl' HotKey[index]=cKey;
rls{~ZRl HotKeyMask[index]=cMask;
x~{W(;`! bAdded=TRUE;
N%1nii KeyCount++;
vg_PMy\ break;
>g@@ yR, }
8s-X H }
~,xso0 return bAdded;
@U1t~f^ }
0($On`# //删除热键
S-</(,E}| BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
}m7$,'C%P {
sOS^ BOOL bRemoved=FALSE;
TqOH(={ for(int index=0;index<MAX_KEY;index++){
nNnfcA&W if(hCallWnd[index]==hWnd){
=En1?3? if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
xe3Jxo!U hCallWnd[index]=NULL;
,Tk53 " HotKey[index]=0;
tYSfeU HotKeyMask[index]=0;
GZY:EHuz[ bRemoved=TRUE;
s~o\j/ KeyCount--;
0<fQjXn break;
BlcsDB =ka }
ziM@@$.F }
S;%k?O7v }
`9P`f4x return bRemoved;
/g!Xe]Ss }
:m/qR74+" eIN0T;1T ,Z! I ^ DLL中的钩子函数如下:
A:pD:}fm}D vGI)c&C> LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
L 7LUy$M-< {
:C,}DyZy BOOL bProcessed=FALSE;
-pQ?ybQ if(HC_ACTION==nCode)
E0DquVrz {
giW9b_ if((lParam&0xc0000000)==0xc0000000){// 有键松开
)a`kL, switch(wParam)
g@Y]$ey%A {
kVG+Wr7l0F case VK_MENU:
HnsLYY\ MaskBits&=~ALTBIT;
BqdpJIr break;
HNlW.y" case VK_CONTROL:
$'<$:;4b3 MaskBits&=~CTRLBIT;
VRSBf;? break;
\%V !&
!' case VK_SHIFT:
|_ U!i MaskBits&=~SHIFTBIT;
q]SH'Wd break;
Z$6B}cz< default: //judge the key and send message
N3oa!PE break;
|)*!&\Ch }
hFhC&2HN for(int index=0;index<MAX_KEY;index++){
,wv>G]v if(hCallWnd[index]==NULL)
hPCSAo!| continue;
s%6L94\t if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
6k<3,`VV| {
x;LO{S4Z SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
:
Cli8# bProcessed=TRUE;
h%v qt~0 }
,\d03wha }
1|:;~9n<t }
/ZH* t \ else if((lParam&0xc000ffff)==1){ //有键按下
P:1eWP switch(wParam)
5~E{bW$ {
TB84} case VK_MENU:
QA)W( 1 MaskBits|=ALTBIT;
0 wDhX break;
w]V684[> case VK_CONTROL:
G9K& }_, MaskBits|=CTRLBIT;
8H8Q break;
\]\ h,Y8 case VK_SHIFT:
?`6Mfpvj96 MaskBits|=SHIFTBIT;
t? =V<Yd1 break;
4\uq$.f- default: //judge the key and send message
~SsfkM" break;
|t;Ktl }
Ay%]l| Gm for(int index=0;index<MAX_KEY;index++){
nB5^ if(hCallWnd[index]==NULL)
g9d/nRX& continue;
q~*|Wd'& if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
P*hYh5a {
bQI.Qk SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
w6^TwjjZ$ bProcessed=TRUE;
9[`\ZGWD }
f2v~: u }
(#>Q#Izr }
x`'s if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
v3kT~uv for(int index=0;index<MAX_KEY;index++){
47A[-&y*X if(hCallWnd[index]==NULL)
O(_f&a continue;
fWF!% |L if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
s!Iinc^p SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
h/// //lParam的意义可看MSDN中WM_KEYDOWN部分
Mt%Q5^ }
h96<9L }
Qkw_9 }
_p9 _P g8 return CallNextHookEx( hHook, nCode, wParam, lParam );
&._Mh }
>N}+O<Fc <xH!
Yskc 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:
s9fEx-!y v`:!$U*
H= BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
.cmhi3o4 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
2(Yt`3Go( '[HU!8F 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
n:H
|=SF{ %z"$?Iv LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
T ~p>Ed 9 {
NvpDi&i if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
OGq=OW {
L[Wi[S6=)g //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
Y'R/|:YL@ SaveBmp();
+j$nbU0U return FALSE;
k9VWyq__ }
]J/;Xp …… //其它处理及默认处理
P;|63"U }
V=Bmpg {`Mb ),G wGHVq
fm5 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
^a!oq~ZSy ?3v-ppw% 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
QPvWdjf#mM )[yKO 二、编程步骤
I^D*) z f&&Ao 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
C?6q]k]r -:b<~S[ 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
'l-VWqR- ?4R q + 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
LVL#qNIu :
>$v@d 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;
" ;\EU4R f.R;<V.) 5、 添加代码,编译运行程序。
&@PAv5iNf iA'p!l|P 三、程序代码
'p%w_VbI 90wnwz ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
s;tI?kR>% #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
DnF|wS #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
-YipPo"a #if _MSC_VER > 1000
4%<D\# #pragma once
u}?{1B! #endif // _MSC_VER > 1000
?b]f$
2 #ifndef __AFXWIN_H__
?9*[\m?- #error include 'stdafx.h' before including this file for PCH
V9
EC@) #endif
5xH*&GpL7 #include "resource.h" // main symbols
i2LN`5k class CHookApp : public CWinApp
5iGz*_
m {
HEK?z|Ne public:
Y`xAJ#=
,i CHookApp();
i}))6 // Overrides
V9`jq$ // ClassWizard generated virtual function overrides
&Mz.i,Gh //{{AFX_VIRTUAL(CHookApp)
/[q_f public:
sq8O+AWl virtual BOOL InitInstance();
h{?f
uoZj% virtual int ExitInstance();
\PmM856=ms //}}AFX_VIRTUAL
H;FzWcm //{{AFX_MSG(CHookApp)
P1`YbLER5 // NOTE - the ClassWizard will add and remove member functions here.
QX.U:p5C // DO NOT EDIT what you see in these blocks of generated code !
eN m
Wul //}}AFX_MSG
KXu1%`x=%Z DECLARE_MESSAGE_MAP()
XhOg> };
iX>)6)uJ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
|%(qaPA1 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
!~-@sq BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
^)3=WD'! BOOL InitHotkey();
,^@/I: BOOL UnInit();
~UsE"5 #endif
,JJ1sf2A 3b<;y% //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
9a'}j#mJo #include "stdafx.h"
@\=4 Rin/q #include "hook.h"
uU+?:C #include <windowsx.h>
!B#tJD #ifdef _DEBUG
UXHtmi|_: #define new DEBUG_NEW
P;ZVv{mT #undef THIS_FILE
Hqu?="f= static char THIS_FILE[] = __FILE__;
7TZ,bD_ #endif
Uz`OAb #define MAX_KEY 100
+#@2, #define CTRLBIT 0x04
48mTL+* #define ALTBIT 0x02
ZYz8ul$E #define SHIFTBIT 0x01
miY=xwK& #pragma data_seg("shareddata")
EDA6b] HHOOK hHook =NULL;
b|Eo\l2 UINT nHookCount =0;
.5#+)] l static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
GGGz7_s
? static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
}&EdA;/o_ static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
2y9$ k\<xV static int KeyCount =0;
3C#Sr6 static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
?A 5;" #pragma data_seg()
:IozWPs* HINSTANCE hins;
(%{!TJg ZR void VerifyWindow();
Wtflw>- BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
@^b>S6d" //{{AFX_MSG_MAP(CHookApp)
u4[rA2Bf8E // NOTE - the ClassWizard will add and remove mapping macros here.
YXGxE&! // DO NOT EDIT what you see in these blocks of generated code!
1(Lq9hs` //}}AFX_MSG_MAP
/8lmNA END_MESSAGE_MAP()
+a'nP=e& $,1KD3;+] CHookApp::CHookApp()
@8SA^u0 {
1]7v3m // TODO: add construction code here,
p4Xhs@.k // Place all significant initialization in InitInstance
kyD*b3MN }
: Z3]Dk;y nTz(
{q CHookApp theApp;
ZgxpHo LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
e.;B?0QrV {
iUf?MDE BOOL bProcessed=FALSE;
k|
>zauK if(HC_ACTION==nCode)
Dwah_ p8 {
YA8ZB&]En/ if((lParam&0xc0000000)==0xc0000000){// Key up
u4:6zU/{ switch(wParam)
'5P:;zw {
:U'Oc3l#Y case VK_MENU:
c+UZ UgP MaskBits&=~ALTBIT;
~fz9PoC break;
I -V=Z: case VK_CONTROL:
z*/}rk4i MaskBits&=~CTRLBIT;
f5#VU7=1F2 break;
&3YXDNm case VK_SHIFT:
rmhL|!
Y MaskBits&=~SHIFTBIT;
ZV~9{E8 break;
va;fT+k= default: //judge the key and send message
s&-dLkis{u break;
VCUsvhI }
N<aMUV m for(int index=0;index<MAX_KEY;index++){
FC8#XZp if(hCallWnd[index]==NULL)
Odbm"Y continue;
zUJPINDb if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
D (">bR)1 {
Jrx]/CM SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
^:o^g'Yab bProcessed=TRUE;
gCW
{$d1= }
ujbJ&p
}
xGK"`\V }
C*Dco{
EQ> else if((lParam&0xc000ffff)==1){ //Key down
8s6^!e& switch(wParam)
lJU]sZ9~b {
cb _nlG! case VK_MENU:
WNiM&iU MaskBits|=ALTBIT;
W%K=N-kE_ break;
j`k:) case VK_CONTROL:
3}i(i0+ MaskBits|=CTRLBIT;
|`@7G`x break;
lD?]D& case VK_SHIFT:
]bAw>1,NVD MaskBits|=SHIFTBIT;
v`~egE17 break;
HJOoCf default: //judge the key and send message
Opf^#6'mq break;
X"v)9p }
Vpf7~2[q% for(int index=0;index<MAX_KEY;index++)
mUwGr_)wj {
X%Ta?(9|.^ if(hCallWnd[index]==NULL)
!]!J"!xg* continue;
Qy|6A@ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
u S{WeL6% {
c4FU@^Vv SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
SHe547X1 bProcessed=TRUE;
Q%_MO`<]$ }
ROr| < }
| <- t }
biAa& if(!bProcessed){
6i*LP(n for(int index=0;index<MAX_KEY;index++){
F ss@/- if(hCallWnd[index]==NULL)
5`1p
? continue;
!FbW3p f if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
Rc`zt7hbJ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
z6bIv} }
#|acRZ9
} }
~{np G }
$R/@%U)-o return CallNextHookEx( hHook, nCode, wParam, lParam );
Hc-Ke1+ }
&^])iG,Ew p`oHF 5 BOOL InitHotkey()
kr5'a:F) {
%CG=mTP if(hHook!=NULL){
*&rV}vVP^ nHookCount++;
5@{~830 return TRUE;
KvuM{UI5 }
RRR=R] else
)zvjsx*e=J hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
O}q(2[*i if(hHook!=NULL)
^%m~V LH nHookCount++;
jo[U6t+pj7 return (hHook!=NULL);
D
P+W*87J }
B3V+/o6 BOOL UnInit()
-^= JKd&p {
$3{I'r] if(nHookCount>1){
8jU6N*p/ nHookCount--;
{$)pkhJ return TRUE;
%51HJB}C] }
-v?)E
S BOOL unhooked = UnhookWindowsHookEx(hHook);
<~35tOpv if(unhooked==TRUE){
)r:gDd#/X nHookCount=0;
t$b{zv9C hHook=NULL;
OT}^dPQe }
+&8'@v$ return unhooked;
RV, cQ K }
MF.$E?_R \$D41_Wt| BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
;F\sMf{ {
>&uR=Yd BOOL bAdded=FALSE;
>I;J!{ for(int index=0;index<MAX_KEY;index++){
vK8!V7o~h% if(hCallWnd[index]==0){
z]R)Bh hCallWnd[index]=hWnd;
<'z.3@D HotKey[index]=cKey;
xs$-^FnD HotKeyMask[index]=cMask;
5q{
-RJ bAdded=TRUE;
~`o%Y"p%rv KeyCount++;
uZ(,7>0 break;
t-$Hti7Lk }
1F94e)M)" }
k= oCpXq^ return bAdded;
;v>+D
{s }
K&/!3vc !yf7y/qY BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
]ag^~8bG
@ {
Z^ }4bR] BOOL bRemoved=FALSE;
QF9$SCmv for(int index=0;index<MAX_KEY;index++){
:A]CD( if(hCallWnd[index]==hWnd){
@y{
f>nm if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
wxo{gBq hCallWnd[index]=NULL;
ueV,p?Wo HotKey[index]=0;
3\&I7o3V HotKeyMask[index]=0;
cg'z:_l bRemoved=TRUE;
wTPHc:2 KeyCount--;
#]FJx break;
8Hh=Sp^ }
1c}LX.9 K }
2+qU9[kd| }
oq9gG)F return bRemoved;
bKP@-<:] }
X16r$~Pb p#tbN5i[{7 void VerifyWindow()
2qfKDZ9f^ {
v!%VH?cA8 for(int i=0;i<MAX_KEY;i++){
RS
/*Dp^ if(hCallWnd
!=NULL){ @w@ `-1
if(!IsWindow(hCallWnd)){ $z'_Hr'
hCallWnd=NULL; \6K1Z!*;
HotKey=0; L|K^w *\C
HotKeyMask=0; 9:]|TIPi
KeyCount--; FpFkZFtG'm
} .V?>Jhok
} SyCa~M!}>
} Bu,VLIba
} nTxN>?l2E
jK-usn
BOOL CHookApp::InitInstance() @sLB
_f
{ K8g9IZ*lT
AFX_MANAGE_STATE(AfxGetStaticModuleState()); ]:F?k#c
hins=AfxGetInstanceHandle(); K{[N.dX(
InitHotkey(); Q804_F
F#
return CWinApp::InitInstance(); !:9s>0';N
} Q[UYNQ0w
8PwPI%Pb
int CHookApp::ExitInstance() 2)47$eu
{ C &-]RffA
VerifyWindow(); Cy'! >
UnInit(); G.sf>.[
return CWinApp::ExitInstance(); RL~]mI!U
} 6SN$El 0|G
x] j&Knli
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file LCkaSv/[RB
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) \s">trXwX
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ W#lt_2!j
#if _MSC_VER > 1000 fW8whN
#pragma once <-Q0s%mNj,
#endif // _MSC_VER > 1000 EawtT
PHQ99&F1
class CCaptureDlg : public CDialog pm k;5 d
{ 37nGFH`K2m
// Construction \K(QE ~y'W
public: |FxTP&8~
BOOL bTray; bd@1j`i
BOOL bRegistered; A<<Bm M.%
BOOL RegisterHotkey(); s.9_/cFWB
UCHAR cKey; $qy ST
UCHAR cMask; f,QBj{M,
void DeleteIcon(); R?H[{AX
void AddIcon(); &(YNz9L
UINT nCount; NncII5z
void SaveBmp(); &)#bdt[
CCaptureDlg(CWnd* pParent = NULL); // standard constructor k9 NPC"
// Dialog Data g RBbL1
//{{AFX_DATA(CCaptureDlg) Tl`HFZQ1
enum { IDD = IDD_CAPTURE_DIALOG }; f4r)g2Zb[
CComboBox m_Key; mZ}C)&,m2
BOOL m_bControl; [V _\SQV0
BOOL m_bAlt; 4'BZ +A,p
BOOL m_bShift; pQ yH`
CString m_Path; "?#O*x
CString m_Number; p| o?nI
//}}AFX_DATA L#9g ~>~
// ClassWizard generated virtual function overrides Vf] ;hm
//{{AFX_VIRTUAL(CCaptureDlg) g.d~`R@v
public: qhqqCVrsW
virtual BOOL PreTranslateMessage(MSG* pMsg); %hH@< <b(s
protected: ?_+8K`B
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support !+Us) 'L
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); C!s !j
//}}AFX_VIRTUAL @bO/5"X,
// Implementation Y!w {,\3
protected: ^.~m4t`U
HICON m_hIcon; ;P!x/Ct
// Generated message map functions %:/?eZ
//{{AFX_MSG(CCaptureDlg) 1@{qPmf^
virtual BOOL OnInitDialog(); J!@`tR-
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); :zLeS-
afx_msg void OnPaint(); W:* {7qJ
afx_msg HCURSOR OnQueryDragIcon(); 66%4p%#b4
virtual void OnCancel(); wTkcR^
afx_msg void OnAbout(); HA0Rv#p
afx_msg void OnBrowse(); *zTEK:+_
afx_msg void OnChange(); SWPb=[WEz
//}}AFX_MSG {axMS yp;
DECLARE_MESSAGE_MAP() G+zIh}9
}; FCA]zR1
#endif 2}jC%jR2
}Z3+z@L
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file *#g[
jl4
#include "stdafx.h" Ft^+P*
#include "Capture.h" pIP^/H
#include "CaptureDlg.h" N@G~+GCxL
#include <windowsx.h> (7J (.EG2e
#pragma comment(lib,"hook.lib") G*\U'w4w|*
#ifdef _DEBUG /j:fc?yv
#define new DEBUG_NEW *nc9u"
#undef THIS_FILE $KMxq=
static char THIS_FILE[] = __FILE__; 6h3TU,$r
#endif fs;pX/:FR
#define IDM_SHELL WM_USER+1 u RPvo}!=1
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); %% A==_b
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); *e}1KcJ
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; -G@:uxB
class CAboutDlg : public CDialog _rj B.
{ X>kW)c4{b
public: kb2M3%6V
CAboutDlg(); o=ULo &9
// Dialog Data I!;vy/r
//{{AFX_DATA(CAboutDlg) YqNI:znm-
enum { IDD = IDD_ABOUTBOX }; 5BsfbLKC
//}}AFX_DATA T f;:C]
// ClassWizard generated virtual function overrides _yP02a^2
//{{AFX_VIRTUAL(CAboutDlg) sTChbks
protected: +#MQ8d
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support fZF.eRP'
//}}AFX_VIRTUAL Kb,#Ot
// Implementation G0&'B6I>
protected: Zq\Vq:MX
//{{AFX_MSG(CAboutDlg) Q3|I.I e
//}}AFX_MSG lJ/{.uK
DECLARE_MESSAGE_MAP() h(MS>=
}; v7@O ,%
@1^:V-=
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) E!zAUEVQm[
{ T,SCK^
//{{AFX_DATA_INIT(CAboutDlg) }j6<S-s~
//}}AFX_DATA_INIT gi5Ffvs$
} ?Y|*EH
C:$pAE(
void CAboutDlg::DoDataExchange(CDataExchange* pDX) TB(!*t
{ VaLl$w
CDialog::DoDataExchange(pDX); f%cbBx^;
//{{AFX_DATA_MAP(CAboutDlg) IM9P5?kJ
?
//}}AFX_DATA_MAP SlojB ^%
} i8H!4l
=V*4&OU
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) R'1L%srTM+
//{{AFX_MSG_MAP(CAboutDlg) 5KvqZ1L
// No message handlers 2z615?2_U
//}}AFX_MSG_MAP pSh$#]mZ`
END_MESSAGE_MAP() ti}G/*4
11jDAA(|
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) \(a!U,]LM
: CDialog(CCaptureDlg::IDD, pParent) n 9N'}z
{ Y:'#jY*V
//{{AFX_DATA_INIT(CCaptureDlg) h(Ccm44
m_bControl = FALSE; v'X=|$75
m_bAlt = FALSE; T^XU5qgN
m_bShift = FALSE; \B1<fF2
m_Path = _T("c:\\"); :dkBr@u96O
m_Number = _T("0 picture captured."); k>mqKzT0$+
nCount=0; CKgbb4;<m[
bRegistered=FALSE; -|x YT+?%
bTray=FALSE; OJ2I (8P
//}}AFX_DATA_INIT bJ6@
B<
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 t?404
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); )o>1=Y`[z
} [V _?`M
}$T!qMst{
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) U**v'%{s
{ 4C[n@p2
CDialog::DoDataExchange(pDX); hDc)\vzr
//{{AFX_DATA_MAP(CCaptureDlg) [tY+P7j9)
DDX_Control(pDX, IDC_KEY, m_Key); GYM6 `
DDX_Check(pDX, IDC_CONTROL, m_bControl); >h<bYk "9Q
DDX_Check(pDX, IDC_ALT, m_bAlt); Isna
KcLM
DDX_Check(pDX, IDC_SHIFT, m_bShift); AiE\PMF~{P
DDX_Text(pDX, IDC_PATH, m_Path); s#2<^6
DDX_Text(pDX, IDC_NUMBER, m_Number); \~ql_X;3
//}}AFX_DATA_MAP V|mz]H#|
} dgsD~.((A
X* Dt<i};v
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) J~URv)g
//{{AFX_MSG_MAP(CCaptureDlg) KQ\d$fX
ON_WM_SYSCOMMAND() TDnbX_xC<
ON_WM_PAINT() 2lm{: tS
ON_WM_QUERYDRAGICON() baL-~`(T
ON_BN_CLICKED(ID_ABOUT, OnAbout)
e+=IGYC
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) "=r"c$xou
ON_BN_CLICKED(ID_CHANGE, OnChange) -yn;Jo2-
//}}AFX_MSG_MAP Up|>)WFw"
END_MESSAGE_MAP() | *J-9
#v QyECf
BOOL CCaptureDlg::OnInitDialog() ,H+LE$=
{ &}/h[v_#'
CDialog::OnInitDialog(); oy!Dm4F
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Q0cr^24/
ASSERT(IDM_ABOUTBOX < 0xF000); |~I-
CMenu* pSysMenu = GetSystemMenu(FALSE); A}cGag+sp
if (pSysMenu != NULL) |L"!^Y#=D
{ byUz
CString strAboutMenu; qn4jy6
strAboutMenu.LoadString(IDS_ABOUTBOX); <dA1n:3o
if (!strAboutMenu.IsEmpty()) 7/$s!pV
{ A"8"e*
pSysMenu->AppendMenu(MF_SEPARATOR); b!ea(D!:
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 6bW:&IPQ;
} :$ "L;"
} dfoFs&CSKh
SetIcon(m_hIcon, TRUE); // Set big icon Q4JvFy0'
SetIcon(m_hIcon, FALSE); // Set small icon :n?K[f?LfY
m_Key.SetCurSel(0); z}[qk:
RegisterHotkey(); U|HF;L
CMenu* pMenu=GetSystemMenu(FALSE); /2\%X`]<
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); g~AOKHUP
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 8x J]K
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); +5BhC9=b
return TRUE; // return TRUE unless you set the focus to a control 0{GpO6!
} C*I~14
3_]<H<w
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) k)a-odNrb
{ L--(Y+vmf
if ((nID & 0xFFF0) == IDM_ABOUTBOX) \%! ~pfM I
{ \dz@hJl:
CAboutDlg dlgAbout; eHjn<@
dlgAbout.DoModal(); ~yvOR`2Gg
} i@C$O.m(
else D/&^Y'|T
{ <
<vE .
CDialog::OnSysCommand(nID, lParam); lV0\UySH
} NHCdf*
} -OS&(7
u0(PWCi2
void CCaptureDlg::OnPaint() d* 6 lJT
{ lbtVQW0V;o
if (IsIconic()) oe:@7stG
{ @!:~gQ
CPaintDC dc(this); // device context for painting UA|A>c
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); x1}7c9nK
// Center icon in client rectangle u0@i3Po
int cxIcon = GetSystemMetrics(SM_CXICON);
Z E*m;
int cyIcon = GetSystemMetrics(SM_CYICON); ~$8t/c
CRect rect; hF!t{ Lf3
GetClientRect(&rect); !P &F6ViO=
int x = (rect.Width() - cxIcon + 1) / 2; U Ux]
int y = (rect.Height() - cyIcon + 1) / 2; c_fx,;
;
// Draw the icon |GvWHe`
dc.DrawIcon(x, y, m_hIcon); AIvIQ$6}
} 6eqPaIaD
else 9N [PZD
{ hK,e<?N^
CDialog::OnPaint(); m"<Sb,"x!
} V2I"m
} 4Em mh=A
G' ~Z'
HCURSOR CCaptureDlg::OnQueryDragIcon() AAr[xoiYp
{ [`~E)B1Y
return (HCURSOR) m_hIcon; >h0iq
} R`wL%I!?f
6_m5%c~;+r
void CCaptureDlg::OnCancel() \tj7Jy
{ "Z&-:1tP{9
if(bTray) #S/]=D
DeleteIcon(); 0Jh^((i*
CDialog::OnCancel(); 1XAXokxj
} Gyak?.@R
:K ^T@F5n
void CCaptureDlg::OnAbout() =7JvS~s
{ s0 ZF+6f
CAboutDlg dlg; H+`s#'(i_P
dlg.DoModal(); KVVo_9S'
} iINd*eXb^
Lbka*@
void CCaptureDlg::OnBrowse() I6x
{ HWJ(O/N
CString str; lw4#xH-?
BROWSEINFO bi; fWx
%?J
char name[MAX_PATH]; iyF~:[8
ZeroMemory(&bi,sizeof(BROWSEINFO)); mTcop yp
bi.hwndOwner=GetSafeHwnd(); SO#NWa<0|
bi.pszDisplayName=name; i+$G=Z#3E
bi.lpszTitle="Select folder"; BitP?6KX
bi.ulFlags=BIF_RETURNONLYFSDIRS; B&~#.<23:
LPITEMIDLIST idl=SHBrowseForFolder(&bi); R\%&Q|
if(idl==NULL) 2nW:|*:/p6
return; 3[g%T2&[
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); =l_B58wrx
str.ReleaseBuffer(); )uvs%hK
m_Path=str;
[*<F
if(str.GetAt(str.GetLength()-1)!='\\') _;G. QwHr
m_Path+="\\"; ,9I %t%sb
UpdateData(FALSE); uXX3IE[
} o5 UM)g
+>#SB"'
void CCaptureDlg::SaveBmp() v=A]#O%
{ '~HCYE:5
CDC dc; 7~@9=e8G
dc.CreateDC("DISPLAY",NULL,NULL,NULL); #V[j Q Vl
CBitmap bm; d{cd+An
int Width=GetSystemMetrics(SM_CXSCREEN); Bb5|+bP
int Height=GetSystemMetrics(SM_CYSCREEN); t6GL/M4
bm.CreateCompatibleBitmap(&dc,Width,Height); -a``
CDC tdc; =.=4P~T&
tdc.CreateCompatibleDC(&dc); V
_(L/6
CBitmap*pOld=tdc.SelectObject(&bm); 9qUc{ydt
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); "|?zQ?E
tdc.SelectObject(pOld); @6eM{3E.
BITMAP btm; nRYHp7`
bm.GetBitmap(&btm); v71j1Q}6
DWORD size=btm.bmWidthBytes*btm.bmHeight; R?)M#^"W
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); &vf9Gp+MK
BITMAPINFOHEADER bih; F-L!o8o
bih.biBitCount=btm.bmBitsPixel; `0.<
bih.biClrImportant=0; Y}<w)b1e|
bih.biClrUsed=0; 6w3z&5DY|
bih.biCompression=0; k8!|WqfP
bih.biHeight=btm.bmHeight; #wXq'yi
bih.biPlanes=1; woCmpCN*I
bih.biSize=sizeof(BITMAPINFOHEADER); >K
}j}M%
bih.biSizeImage=size; B$R"Ntp
bih.biWidth=btm.bmWidth; {E6M_qZ
bih.biXPelsPerMeter=0; xbbQ)sH&m
bih.biYPelsPerMeter=0; y0!-].5UH
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); d5zv8?|X+
static int filecount=0; "gD]K=
CString name; E8_j?X1
name.Format("pict%04d.bmp",filecount++); kD&%
7Vz
name=m_Path+name; a$0,T_wD
BITMAPFILEHEADER bfh; Gwyjie 9t
bfh.bfReserved1=bfh.bfReserved2=0; VRuY8<E
bfh.bfType=((WORD)('M'<< 8)|'B'); bC_qoI<
bfh.bfSize=54+size; K(&I8vAp
bfh.bfOffBits=54; :@BAiKa[wa
CFile bf; G(g`>' m
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ |m x)W}
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 97/"5i9
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); =:)p\{B
bf.WriteHuge(lpData,size); }HO3D.HE^
bf.Close(); 4R 9lA
nCount++; 0rM'VgB
} {y5v"GR{YM
GlobalFreePtr(lpData); ^HJvT)e4
if(nCount==1) p:*)rE
m_Number.Format("%d picture captured.",nCount); v:2*<;
else DhN{Y8'~
m_Number.Format("%d pictures captured.",nCount); s(~tL-_ K
UpdateData(FALSE); xF:}a:c@H
} B|\pzWD%
1r!o,0!d-'
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) M]FA
y "E
{ 6Z09)}tZb
if(pMsg -> message == WM_KEYDOWN) :%_*C09
{ (u/-ud1p
if(pMsg -> wParam == VK_ESCAPE) <ttrd%VW
return TRUE; 'CF?pxNQ l
if(pMsg -> wParam == VK_RETURN) $<;!F=%8
return TRUE; (T290a9y>
} MK"p~b0->
return CDialog::PreTranslateMessage(pMsg); R,+Pcn$ws
} N*J!<vY"
]]sy+$@~
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) )4nf={iM
{ M)m(
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ;iol 2
SaveBmp(); 29a~B<e7s
return FALSE; &@g~o0
} 79m',9{u
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ;Jh=7wx
CMenu pop; jXa;ovPK
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); {..6{~L
CMenu*pMenu=pop.GetSubMenu(0); ivgV5)".
pMenu->SetDefaultItem(ID_EXITICON); p"%K(NL
CPoint pt; i5PZ )&
GetCursorPos(&pt); ElFiR;
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); *Sd}cDCO%
if(id==ID_EXITICON) 3pzp6o2
DeleteIcon(); jN3K=
MA
else if(id==ID_EXIT) ^{<!pvT
OnCancel(); BM~>=emc
return FALSE; Sw1z^`
} Q7
4Q|r7
LRESULT res= CDialog::WindowProc(message, wParam, lParam); /Bt+Ov3k
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) )Y@E5Tuk>
AddIcon(); wwvS05=[T
return res; ,@\$PyJ
} bD2):U*Fzo
|:H
9#=
void CCaptureDlg::AddIcon() D^_]x51>
{ B//2R)HS
NOTIFYICONDATA data; 0|Rt[qwKb@
data.cbSize=sizeof(NOTIFYICONDATA); `;`fA|F^
CString tip; VVd9VGvh
tip.LoadString(IDS_ICONTIP); [6ycs[{!
data.hIcon=GetIcon(0); 5`_UIYcI
data.hWnd=GetSafeHwnd(); ''Pu
strcpy(data.szTip,tip); U4$}8~o4
data.uCallbackMessage=IDM_SHELL; Jw+k=>
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; i1c
z+}
data.uID=98; Quq
X4
Shell_NotifyIcon(NIM_ADD,&data); i%FpPni
ShowWindow(SW_HIDE); =pT}]
bTray=TRUE; `@_jDo
} /v <FH}
0uZL*4A+C
void CCaptureDlg::DeleteIcon() 8I>'xf
{ ??]b,f4CNa
NOTIFYICONDATA data; %%-?~rjI
data.cbSize=sizeof(NOTIFYICONDATA); qsA`\%]H
data.hWnd=GetSafeHwnd(); u5'jIqlU
data.uID=98; K/flg|uZ/V
Shell_NotifyIcon(NIM_DELETE,&data); :@~Nszlb
ShowWindow(SW_SHOW); YcRo>:I
SetForegroundWindow(); GLBzlZ?
ShowWindow(SW_SHOWNORMAL); {uCXF~v
bTray=FALSE; IPVD^a?
} Kggc9^ 7
_c z$w5`
void CCaptureDlg::OnChange() s)A=hB-V
{ -X]?ql*%`
RegisterHotkey(); kd=|Iip;(
} h,*-V 'X.k
kB!
iEoIBA
BOOL CCaptureDlg::RegisterHotkey() y/.I<5+Bu
{ e{Y8m Xu
UpdateData(); Jan~Rran
UCHAR mask=0; hZw bYvu
UCHAR key=0; 4[XiD*
*
if(m_bControl) LBIsj}e
mask|=4; ^~7/hm:
if(m_bAlt) l-gNJ=l+K
mask|=2; BJDSk#!J!{
if(m_bShift) 7l+:gD
mask|=1; +Oafo|%
key=Key_Table[m_Key.GetCurSel()]; P\rA>ZY
if(bRegistered){ F97HFt6{
DeleteHotkey(GetSafeHwnd(),cKey,cMask); )c<X.4
bRegistered=FALSE; IaHu$` v
} `
it<\r[=
cMask=mask; >zS<1
cKey=key; o>l/*i0I
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); "\~d!"n|2
return bRegistered; |?gO@?KDZ
} N<N uBtkA
NI^jQS
M]
四、小结 my}l?S[2d@
t_"]n*zk1
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。