16位C/C++代码调用DLL问题
各位大神，论坛里有一个帖子：【新提醒】数据库逆向工程（三） - 『脱壳破解区』 - 吾爱破解 - LCG - LSG |安卓破解|病毒分析|www.52pojie.cn
英文原文：https://medium.com/@MorteNoir/database-reverse-engineering-part-3-code-reuse-conclusion-b2145420b09b
讲的是如何通过直接调用`FNAUTIL2.dll`来读取图片压缩数据`MCImage.DAT`文件的，我尝试了很久，试过在Windows XP下通过`Open Watcom C`来调用，但都失败了。
有了解这个的大神吗？能给一些指导，我将非常感激！
```C
#include <windows.h>
#include <stdio.h>
#include <fcntl.h>
#include <io.h>
typedef struct {
long unk_1;
long unk_2;
int unk_3;
int mcimage;
} ImageFileData;
typedef int (FAR PASCAL *GETCOMPRESSEDIMAGE)( LPINT, LPLONG, LPLONG, LONG, LONG, ImageFileData*);
BOOL decrypt_image(const char* mcimage_path,
unsigned long enc_image_offset,
unsigned long enc_image_size)
{
HANDLE hDrv;
GETCOMPRESSEDIMAGE GETCOMPRESSEDIMAGE_Addr;
char message;
HBITMAP bitmap;
int mcimage;
long screen_width = 0;
long screen_height = 0;
int ret_val = 0;
ImageFileData data = {0,0,0,0};
if ((hDrv = LoadLibrary("FAPUTIL.DLL")) < 32) {
MessageBox(NULL, "ERROR: failed to load GETCOMPRESSEDIMAGE from FAPUTIL.DLL\n", "Error", MB_OK | MB_TASKMODAL);
return FALSE;
} else {
sprintf(message, "%s -> %d", "Works LoadLibrary: ", hDrv);
MessageBox(NULL, message, "Success", MB_OK | MB_TASKMODAL);
}
GETCOMPRESSEDIMAGE_Addr = GetProcAddress(hDrv, "GETCOMPRESSEDIMAGE");
if (! GETCOMPRESSEDIMAGE_Addr) {
MessageBox(NULL, "ERROR: failed to GetProcAddress GETCOMPRESSEDIMAGE from FAPUTIL.DLL\n", "Error", MB_OK | MB_TASKMODAL);
return FALSE;
} else {
sprintf(message, "%s -> %d", "Works GETCOMPRESSEDIMAGE_Addr: ", GETCOMPRESSEDIMAGE_Addr);
MessageBox(NULL, message, "Success", MB_OK | MB_TASKMODAL);
}
mcimage = open(mcimage_path, O_RDONLY | O_BINARY);
sprintf(message, "%s %s %d", mcimage_path, " -> ", mcimage);
MessageBox(NULL, message, "Success", MB_OK | MB_TASKMODAL);
data.mcimage = mcimage;
bitmap = (*(GETCOMPRESSEDIMAGE) GETCOMPRESSEDIMAGE_Addr)(&ret_val, &screen_height, &screen_width, enc_image_size, enc_image_offset, &data);
sprintf(message, "%s %d", " bitmap -> ", bitmap);
MessageBox(NULL, message, "Success", MB_OK | MB_TASKMODAL);
close(mcimage);
return TRUE;
}
int PASCAL WinMain(HANDLE hInstance, HANDLE hPrevInst, LPSTR lpCmdLine, int nCmdShow)
{
char* mcimage_path = "C:\\FAP_data\\MCImage.DAT";
if (!LoadDLL(mcimage_path, 377759538, 21337))
{
MessageBox(NULL, "Could not load dll!", "Error", MB_OK | MB_TASKMODAL);
}
return (0);
}
```
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